Heidi Splete

Delayed umbilical cord clamping for at least 60 seconds after birth significantly reduced death or disability in infants of less than 30 weeks’ gestation, according to data from nearly 1,500 infants.

The burden of disability and mortality for babies born before 30 weeks’ gestation remains high, especially in low- and middle-income countries, wrote Kristy P. Robledo, PhD, of the University of Sydney, Australia, and colleagues. Delayed clamping of the umbilical cord is a simple procedure that may improve mortality in this population, but more research is needed; recommended times to delayed clamping range from 30 seconds to 3 minutes, they noted.

In a study published in The Lancet Child & Adolescent Health, the researchers randomized 767 very preterm infants to delayed clamping at least 60 seconds after birth and 764 to immediate clamping. Of these, 384 were multiple births (who were individually randomized), 862 were male, and 505 were born before 27 weeks’ gestation. The primary outcome was death or disability at 2 years of age. Major disability was defined as cerebral palsy, severe visual loss, deafness requiring a hearing aid or cochlear implants, major language or speech problems, or cognitive delay at 2 years corrected age. The median time to clamping was 60 seconds in the delayed group and 5 seconds in the immediate group.

Primary outcome data were available for 1,419 infants. Death or major disability occurred in 29% of infants assigned to delayed clamping compared to 34% of those assigned to immediate clamping (relative risk 0.83, P = .010). The infants were part of the APTS Childhood Follow-Up Study, an open-label superiority trial conducted in Australia and New Zealand.

By age 2 years, 8% of infants in the delayed group and 11% of those in the immediate group had died; 23% and 26%, respectively, met criteria for major disability. The impact of delayed clamping translates to a 30% reduction in relative risk of mortality at 2 years of age, but no significant impact on major disability, the researchers wrote.

The findings were limited by several factors including the unblinded study design, lack of data on heart rate or time to first breath, and the clamping prior to 60 seconds in 26% of infants in the delayed group based on clinical concerns for these specific infants, the researchers noted.

However, the results were strengthened by the large size, low risk of bias, and specific primary outcome, they said. The data support findings from recent systematic reviews and highlight the need for further trials to evaluate delayed clamping at different time points, with larger populations, inclusion of time to first breath and heart rate, and improved measures of disability, the researchers added.

In clinical practice, “Given that aiming to delay cord clamping for 60 seconds or more improved 2-year outcomes and short-term hematological measures with no evidence of significant harm, it seems reasonable to conclude that delayed clamping is appropriate as standard care in very preterm infants,” they concluded.
 

Accepting simple intervention could have great impact

This study is important in light of the overwhelming burden of preterm birth on the health care system and society as a whole, Lisette D. Tanner, MD, of Emory University, Atlanta, said in an interview.

“Preterm birth is associated with billions in health care costs each year, and a large portion of that money is directed to the complications associated with preterm birth, such as early intervention services, educational support, and ongoing medical care,” Dr. Tanner said. “This study is particularly timely, as we are quickly approaching 2030, the deadline for achieving the United Nations Sustainable Development Goal of ending preventable deaths of newborns and children under 5 years of age,” she said. The goal involves “all countries aiming to reduce neonatal mortality to at least as low as 12 per 1,000 live births and under-5 mortality to at least as low as 25 per 1,000 live births. Effective treatments to reduce infant and child mortality would make strong inroads toward this goal,” she explained.

Dr. Tanner said she was not surprised by the findings because previous studies have shown similar results. “However, the large, multicenter nature of this study provides additional weight to recommendations to delay cord clamping as standard practice,” she said.

“The findings of this study support the recommendations of a number of large organizations,” said Dr. Tanner. “The World Health Organization recommends that the umbilical cord not be clamped earlier than 1 minute after birth in term or preterm infants who do not require positive pressure ventilation. The American College of Obstetricians and Gynecologists and the American Academy of Pediatrics now recommend a delay in umbilical cord clamping in vigorous term and preterm infants for at least 30–60 seconds after birth,” she said. “The Royal College of Obstetricians and Gynaecologists also recommends deferring umbilical cord clamping for healthy term and preterm infants for at least 2 minutes after birth,” she added.  

However, “the delay in adoption of this guidelines in practice appears to be related to some concerns regarding universal adoption of this approach,” Dr. Tanner noted. “Some clinicians have suggested that delayed cord clamping could delay vital neonatal resuscitative efforts, leading to worse neonatal outcomes, but this concern has not been borne out in the data, as all guidelines specifically state that this intervention is for vigorous newborns,” she said. “In fact, in preterm infants, delayed cord clamping is associated with improved transitional circulation, decreased need for blood transfusion, and lower incidence of necrotizing enterocolitis and intraventricular hemorrhage,” Dr. Tanner emphasized. “Additionally, concerns persist that delayed cord clamping could lead to excessive transfusion with resultant polycythemia. Again, no data have supported this claim to date,” she said.

“Finally, some clinicians are concerned that delayed clamping could lead to delay in addressing maternal complications of birth such as hemorrhage, but studies have shown the opposite; delayed umbilical cord clamping has not been associated with an increased risk of postpartum hemorrhage or increased blood loss at delivery, nor has it been with a difference in the need for blood transfusion,” said Dr. Tanner.

Ideally, practitioners will become more comfortable in delaying cord clamping as a routine practice as more data demonstrating the safety and benefit of this easy intervention are disseminated, she said.

Additional research delineating which gestational ages benefit most from delayed cord clamping would help direct education efforts to implement this intervention, Dr. Tanner noted.

The study was funded by the Australian National Health and Medical Research Council. The researchers and Dr. Tanner had no financial conflicts to disclose.

Delayed umbilical cord clamping for at least 60 seconds after birth significantly reduced death or disability in infants of less than 30 weeks’ gestation, according to data from nearly 1,500 infants.

The burden of disability and mortality for babies born before 30 weeks’ gestation remains high, especially in low- and middle-income countries, wrote Kristy P. Robledo, PhD, of the University of Sydney, Australia, and colleagues. Delayed clamping of the umbilical cord is a simple procedure that may improve mortality in this population, but more research is needed; recommended times to delayed clamping range from 30 seconds to 3 minutes, they noted.

In a study published in The Lancet Child & Adolescent Health, the researchers randomized 767 very preterm infants to delayed clamping at least 60 seconds after birth and 764 to immediate clamping. Of these, 384 were multiple births (who were individually randomized), 862 were male, and 505 were born before 27 weeks’ gestation. The primary outcome was death or disability at 2 years of age. Major disability was defined as cerebral palsy, severe visual loss, deafness requiring a hearing aid or cochlear implants, major language or speech problems, or cognitive delay at 2 years corrected age. The median time to clamping was 60 seconds in the delayed group and 5 seconds in the immediate group.

Primary outcome data were available for 1,419 infants. Death or major disability occurred in 29% of infants assigned to delayed clamping compared to 34% of those assigned to immediate clamping (relative risk 0.83, P = .010). The infants were part of the APTS Childhood Follow-Up Study, an open-label superiority trial conducted in Australia and New Zealand.

By age 2 years, 8% of infants in the delayed group and 11% of those in the immediate group had died; 23% and 26%, respectively, met criteria for major disability. The impact of delayed clamping translates to a 30% reduction in relative risk of mortality at 2 years of age, but no significant impact on major disability, the researchers wrote.

The findings were limited by several factors including the unblinded study design, lack of data on heart rate or time to first breath, and the clamping prior to 60 seconds in 26% of infants in the delayed group based on clinical concerns for these specific infants, the researchers noted.

However, the results were strengthened by the large size, low risk of bias, and specific primary outcome, they said. The data support findings from recent systematic reviews and highlight the need for further trials to evaluate delayed clamping at different time points, with larger populations, inclusion of time to first breath and heart rate, and improved measures of disability, the researchers added.

In clinical practice, “Given that aiming to delay cord clamping for 60 seconds or more improved 2-year outcomes and short-term hematological measures with no evidence of significant harm, it seems reasonable to conclude that delayed clamping is appropriate as standard care in very preterm infants,” they concluded.
 

Accepting simple intervention could have great impact

This study is important in light of the overwhelming burden of preterm birth on the health care system and society as a whole, Lisette D. Tanner, MD, of Emory University, Atlanta, said in an interview.

“Preterm birth is associated with billions in health care costs each year, and a large portion of that money is directed to the complications associated with preterm birth, such as early intervention services, educational support, and ongoing medical care,” Dr. Tanner said. “This study is particularly timely, as we are quickly approaching 2030, the deadline for achieving the United Nations Sustainable Development Goal of ending preventable deaths of newborns and children under 5 years of age,” she said. The goal involves “all countries aiming to reduce neonatal mortality to at least as low as 12 per 1,000 live births and under-5 mortality to at least as low as 25 per 1,000 live births. Effective treatments to reduce infant and child mortality would make strong inroads toward this goal,” she explained.

Dr. Tanner said she was not surprised by the findings because previous studies have shown similar results. “However, the large, multicenter nature of this study provides additional weight to recommendations to delay cord clamping as standard practice,” she said.

“The findings of this study support the recommendations of a number of large organizations,” said Dr. Tanner. “The World Health Organization recommends that the umbilical cord not be clamped earlier than 1 minute after birth in term or preterm infants who do not require positive pressure ventilation. The American College of Obstetricians and Gynecologists and the American Academy of Pediatrics now recommend a delay in umbilical cord clamping in vigorous term and preterm infants for at least 30–60 seconds after birth,” she said. “The Royal College of Obstetricians and Gynaecologists also recommends deferring umbilical cord clamping for healthy term and preterm infants for at least 2 minutes after birth,” she added.  

However, “the delay in adoption of this guidelines in practice appears to be related to some concerns regarding universal adoption of this approach,” Dr. Tanner noted. “Some clinicians have suggested that delayed cord clamping could delay vital neonatal resuscitative efforts, leading to worse neonatal outcomes, but this concern has not been borne out in the data, as all guidelines specifically state that this intervention is for vigorous newborns,” she said. “In fact, in preterm infants, delayed cord clamping is associated with improved transitional circulation, decreased need for blood transfusion, and lower incidence of necrotizing enterocolitis and intraventricular hemorrhage,” Dr. Tanner emphasized. “Additionally, concerns persist that delayed cord clamping could lead to excessive transfusion with resultant polycythemia. Again, no data have supported this claim to date,” she said.

“Finally, some clinicians are concerned that delayed clamping could lead to delay in addressing maternal complications of birth such as hemorrhage, but studies have shown the opposite; delayed umbilical cord clamping has not been associated with an increased risk of postpartum hemorrhage or increased blood loss at delivery, nor has it been with a difference in the need for blood transfusion,” said Dr. Tanner.

Ideally, practitioners will become more comfortable in delaying cord clamping as a routine practice as more data demonstrating the safety and benefit of this easy intervention are disseminated, she said.

Additional research delineating which gestational ages benefit most from delayed cord clamping would help direct education efforts to implement this intervention, Dr. Tanner noted.

The study was funded by the Australian National Health and Medical Research Council. The researchers and Dr. Tanner had no financial conflicts to disclose.

Delayed umbilical cord clamping for at least 60 seconds after birth significantly reduced death or disability in infants of less than 30 weeks’ gestation, according to data from nearly 1,500 infants.

The burden of disability and mortality for babies born before 30 weeks’ gestation remains high, especially in low- and middle-income countries, wrote Kristy P. Robledo, PhD, of the University of Sydney, Australia, and colleagues. Delayed clamping of the umbilical cord is a simple procedure that may improve mortality in this population, but more research is needed; recommended times to delayed clamping range from 30 seconds to 3 minutes, they noted.

In a study published in The Lancet Child & Adolescent Health, the researchers randomized 767 very preterm infants to delayed clamping at least 60 seconds after birth and 764 to immediate clamping. Of these, 384 were multiple births (who were individually randomized), 862 were male, and 505 were born before 27 weeks’ gestation. The primary outcome was death or disability at 2 years of age. Major disability was defined as cerebral palsy, severe visual loss, deafness requiring a hearing aid or cochlear implants, major language or speech problems, or cognitive delay at 2 years corrected age. The median time to clamping was 60 seconds in the delayed group and 5 seconds in the immediate group.

Primary outcome data were available for 1,419 infants. Death or major disability occurred in 29% of infants assigned to delayed clamping compared to 34% of those assigned to immediate clamping (relative risk 0.83, P = .010). The infants were part of the APTS Childhood Follow-Up Study, an open-label superiority trial conducted in Australia and New Zealand.

By age 2 years, 8% of infants in the delayed group and 11% of those in the immediate group had died; 23% and 26%, respectively, met criteria for major disability. The impact of delayed clamping translates to a 30% reduction in relative risk of mortality at 2 years of age, but no significant impact on major disability, the researchers wrote.

The findings were limited by several factors including the unblinded study design, lack of data on heart rate or time to first breath, and the clamping prior to 60 seconds in 26% of infants in the delayed group based on clinical concerns for these specific infants, the researchers noted.

However, the results were strengthened by the large size, low risk of bias, and specific primary outcome, they said. The data support findings from recent systematic reviews and highlight the need for further trials to evaluate delayed clamping at different time points, with larger populations, inclusion of time to first breath and heart rate, and improved measures of disability, the researchers added.

In clinical practice, “Given that aiming to delay cord clamping for 60 seconds or more improved 2-year outcomes and short-term hematological measures with no evidence of significant harm, it seems reasonable to conclude that delayed clamping is appropriate as standard care in very preterm infants,” they concluded.
 

Accepting simple intervention could have great impact

This study is important in light of the overwhelming burden of preterm birth on the health care system and society as a whole, Lisette D. Tanner, MD, of Emory University, Atlanta, said in an interview.

“Preterm birth is associated with billions in health care costs each year, and a large portion of that money is directed to the complications associated with preterm birth, such as early intervention services, educational support, and ongoing medical care,” Dr. Tanner said. “This study is particularly timely, as we are quickly approaching 2030, the deadline for achieving the United Nations Sustainable Development Goal of ending preventable deaths of newborns and children under 5 years of age,” she said. The goal involves “all countries aiming to reduce neonatal mortality to at least as low as 12 per 1,000 live births and under-5 mortality to at least as low as 25 per 1,000 live births. Effective treatments to reduce infant and child mortality would make strong inroads toward this goal,” she explained.

Dr. Tanner said she was not surprised by the findings because previous studies have shown similar results. “However, the large, multicenter nature of this study provides additional weight to recommendations to delay cord clamping as standard practice,” she said.

“The findings of this study support the recommendations of a number of large organizations,” said Dr. Tanner. “The World Health Organization recommends that the umbilical cord not be clamped earlier than 1 minute after birth in term or preterm infants who do not require positive pressure ventilation. The American College of Obstetricians and Gynecologists and the American Academy of Pediatrics now recommend a delay in umbilical cord clamping in vigorous term and preterm infants for at least 30–60 seconds after birth,” she said. “The Royal College of Obstetricians and Gynaecologists also recommends deferring umbilical cord clamping for healthy term and preterm infants for at least 2 minutes after birth,” she added.  

However, “the delay in adoption of this guidelines in practice appears to be related to some concerns regarding universal adoption of this approach,” Dr. Tanner noted. “Some clinicians have suggested that delayed cord clamping could delay vital neonatal resuscitative efforts, leading to worse neonatal outcomes, but this concern has not been borne out in the data, as all guidelines specifically state that this intervention is for vigorous newborns,” she said. “In fact, in preterm infants, delayed cord clamping is associated with improved transitional circulation, decreased need for blood transfusion, and lower incidence of necrotizing enterocolitis and intraventricular hemorrhage,” Dr. Tanner emphasized. “Additionally, concerns persist that delayed cord clamping could lead to excessive transfusion with resultant polycythemia. Again, no data have supported this claim to date,” she said.

“Finally, some clinicians are concerned that delayed clamping could lead to delay in addressing maternal complications of birth such as hemorrhage, but studies have shown the opposite; delayed umbilical cord clamping has not been associated with an increased risk of postpartum hemorrhage or increased blood loss at delivery, nor has it been with a difference in the need for blood transfusion,” said Dr. Tanner.

Ideally, practitioners will become more comfortable in delaying cord clamping as a routine practice as more data demonstrating the safety and benefit of this easy intervention are disseminated, she said.

Additional research delineating which gestational ages benefit most from delayed cord clamping would help direct education efforts to implement this intervention, Dr. Tanner noted.

The study was funded by the Australian National Health and Medical Research Council. The researchers and Dr. Tanner had no financial conflicts to disclose.

Based on data from a meta-analysis of 95 studies that included nearly 30,000,000 individuals, the pooled percentage of asymptomatic COVID-19 infections was 0.25% in the tested population and 40.5% among confirmed cases.

Asymptomatic infections remain potential sources of transmission for COVID-19, especially as communities reopen and public life resumes, but the percentage of these infections among those tested and among those diagnosed with COVID-19 has not been examined, wrote Qiuyue Ma, PhD, and colleagues of Peking University, Beijing.

In a study published in JAMA Network Open the researchers identified 44 cross-sectional studies, 41 cohort studies, seven case series, and three case series on transmission studies. A total of 74 studies were conducted in developed countries, including those in Europe, North America, and Asia. Approximately one-third (37) of the studies were conducted among health care workers or in-hospital patients, 17 among nursing home staff or residents, and 14 among community residents. In addition, 13 studies involved pregnant women, eight involved air or cruise ship travelers, and six involved close contacts of individuals with confirmed infections.

The meta-analysis included 29,776,306 tested individuals; 11,516 of them had asymptomatic infections.

Overall, the pooled percentage of asymptomatic infections among the tested population was 0.25%. In an analysis of different study populations, the percentage was higher in nursing home residents or staff (4.52%), air or cruise ship travelers (2.02%), and pregnant women (2.34%), compared against the pooled percentage.

The pooled percentage of asymptomatic infections among the confirmed population was 40.50%, and this percentage was higher in pregnant women (54.11%), air or cruise ship travelers (52.91%), and nursing home residents or staff (47.53%).

The pooled percentage in the tested population was higher than the overall percentage when the mean age of the study population was 60 years or older (3.69%). By contrast, in the confirmed population, the pooled percentage was higher than the overall percentage when the study population was younger than 20 years (60.2%) or aged 20 to 39 years (49.5%).

The researchers noted in their discussion that the varying percentage of asymptomatic individuals according to community prevalence might impact the heterogeneity of the included studies. They also noted the high number of studies conducted in nursing home populations, groups in which asymptomatic individuals were more likely to be tested.

The study findings were limited by several factors, including the potential for missed studies that were not published at the time of the meta-analysis, as well as the exclusion of studies written in Chinese, the researchers noted. Other limitations included lack of follow-up on presymptomatic and covert infections, and the focus on specific populations, factors that may limit the degree to which the results can be generalized.

However, the results highlight the need to screen for asymptomatic infections, especially in countries where COVID-19 has been better controlled, the researchers said. Management strategies for asymptomatic infections, when identified, should include isolation and contact tracing similar to strategies used with confirmed cases, they added. 
 

More testing needed to catch cases early

“During the initial phase of [the] COVID-19 pandemic, testing was not widely available in the United States or the rest of the world,” Setu Patolia, MD, of Saint Louis University School of Medicine, Missouri, said in an interview. Much of the world still lacks access to COVID-19 testing, and early in the pandemic only severely symptomatic patients were tested, he said. “With new variants, particularly the Omicron variant, which may have mild or minimally symptomatic disease, asymptomatic carriers play an important role in propagation of the pandemic,” he explained. “It is important to know the asymptomatic carrier rate among the general population for the future control of [the] pandemic,” he added.

Dr. Patolia said he was surprised by the study finding that one in 400 people in the general population could be asymptomatic carriers of COVID-19.

“Also, nursing home patients are more at risk of complications of COVID, and I expected that they would have a higher rate of symptomatic disease as compared to [the] general population,” said Dr. Patolia. He was also surprised by the high rate of asymptomatic infections in travelers.

“Physicians should be more aware about the asymptomatic carrier rate, particularly in travelers and nursing home patients,” he noted. “Travelers carry high risk of transferring infection from one region to another region of the world, and physicians should advise them to get tested despite the absence of symptoms,” Dr. Patolia emphasized. “Similarly, once any nursing home patient has been diagnosed with COVID-19, physicians should be more careful with the rest of the nursing home patients and test them despite the absence of the symptoms,” he added.

Dr. Patolia also recommended that pregnant women wear masks to help prevent disease transmission when visiting a doctor’s office or labor unit.

Looking ahead, there is a need for cheaper at-home testing kits so that all vulnerable populations can be tested fast and frequently, Dr. Patolia said.

The study was supported by the National Natural Science Foundation of China. The researchers had no financial conflicts to disclose. Dr. Patolia has disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Based on data from a meta-analysis of 95 studies that included nearly 30,000,000 individuals, the pooled percentage of asymptomatic COVID-19 infections was 0.25% in the tested population and 40.5% among confirmed cases.

Asymptomatic infections remain potential sources of transmission for COVID-19, especially as communities reopen and public life resumes, but the percentage of these infections among those tested and among those diagnosed with COVID-19 has not been examined, wrote Qiuyue Ma, PhD, and colleagues of Peking University, Beijing.

In a study published in JAMA Network Open the researchers identified 44 cross-sectional studies, 41 cohort studies, seven case series, and three case series on transmission studies. A total of 74 studies were conducted in developed countries, including those in Europe, North America, and Asia. Approximately one-third (37) of the studies were conducted among health care workers or in-hospital patients, 17 among nursing home staff or residents, and 14 among community residents. In addition, 13 studies involved pregnant women, eight involved air or cruise ship travelers, and six involved close contacts of individuals with confirmed infections.

The meta-analysis included 29,776,306 tested individuals; 11,516 of them had asymptomatic infections.

Overall, the pooled percentage of asymptomatic infections among the tested population was 0.25%. In an analysis of different study populations, the percentage was higher in nursing home residents or staff (4.52%), air or cruise ship travelers (2.02%), and pregnant women (2.34%), compared against the pooled percentage.

The pooled percentage of asymptomatic infections among the confirmed population was 40.50%, and this percentage was higher in pregnant women (54.11%), air or cruise ship travelers (52.91%), and nursing home residents or staff (47.53%).

The pooled percentage in the tested population was higher than the overall percentage when the mean age of the study population was 60 years or older (3.69%). By contrast, in the confirmed population, the pooled percentage was higher than the overall percentage when the study population was younger than 20 years (60.2%) or aged 20 to 39 years (49.5%).

The researchers noted in their discussion that the varying percentage of asymptomatic individuals according to community prevalence might impact the heterogeneity of the included studies. They also noted the high number of studies conducted in nursing home populations, groups in which asymptomatic individuals were more likely to be tested.

The study findings were limited by several factors, including the potential for missed studies that were not published at the time of the meta-analysis, as well as the exclusion of studies written in Chinese, the researchers noted. Other limitations included lack of follow-up on presymptomatic and covert infections, and the focus on specific populations, factors that may limit the degree to which the results can be generalized.

However, the results highlight the need to screen for asymptomatic infections, especially in countries where COVID-19 has been better controlled, the researchers said. Management strategies for asymptomatic infections, when identified, should include isolation and contact tracing similar to strategies used with confirmed cases, they added. 
 

More testing needed to catch cases early

“During the initial phase of [the] COVID-19 pandemic, testing was not widely available in the United States or the rest of the world,” Setu Patolia, MD, of Saint Louis University School of Medicine, Missouri, said in an interview. Much of the world still lacks access to COVID-19 testing, and early in the pandemic only severely symptomatic patients were tested, he said. “With new variants, particularly the Omicron variant, which may have mild or minimally symptomatic disease, asymptomatic carriers play an important role in propagation of the pandemic,” he explained. “It is important to know the asymptomatic carrier rate among the general population for the future control of [the] pandemic,” he added.

Dr. Patolia said he was surprised by the study finding that one in 400 people in the general population could be asymptomatic carriers of COVID-19.

“Also, nursing home patients are more at risk of complications of COVID, and I expected that they would have a higher rate of symptomatic disease as compared to [the] general population,” said Dr. Patolia. He was also surprised by the high rate of asymptomatic infections in travelers.

“Physicians should be more aware about the asymptomatic carrier rate, particularly in travelers and nursing home patients,” he noted. “Travelers carry high risk of transferring infection from one region to another region of the world, and physicians should advise them to get tested despite the absence of symptoms,” Dr. Patolia emphasized. “Similarly, once any nursing home patient has been diagnosed with COVID-19, physicians should be more careful with the rest of the nursing home patients and test them despite the absence of the symptoms,” he added.

Dr. Patolia also recommended that pregnant women wear masks to help prevent disease transmission when visiting a doctor’s office or labor unit.

Looking ahead, there is a need for cheaper at-home testing kits so that all vulnerable populations can be tested fast and frequently, Dr. Patolia said.

The study was supported by the National Natural Science Foundation of China. The researchers had no financial conflicts to disclose. Dr. Patolia has disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Based on data from a meta-analysis of 95 studies that included nearly 30,000,000 individuals, the pooled percentage of asymptomatic COVID-19 infections was 0.25% in the tested population and 40.5% among confirmed cases.

Asymptomatic infections remain potential sources of transmission for COVID-19, especially as communities reopen and public life resumes, but the percentage of these infections among those tested and among those diagnosed with COVID-19 has not been examined, wrote Qiuyue Ma, PhD, and colleagues of Peking University, Beijing.

In a study published in JAMA Network Open the researchers identified 44 cross-sectional studies, 41 cohort studies, seven case series, and three case series on transmission studies. A total of 74 studies were conducted in developed countries, including those in Europe, North America, and Asia. Approximately one-third (37) of the studies were conducted among health care workers or in-hospital patients, 17 among nursing home staff or residents, and 14 among community residents. In addition, 13 studies involved pregnant women, eight involved air or cruise ship travelers, and six involved close contacts of individuals with confirmed infections.

The meta-analysis included 29,776,306 tested individuals; 11,516 of them had asymptomatic infections.

Overall, the pooled percentage of asymptomatic infections among the tested population was 0.25%. In an analysis of different study populations, the percentage was higher in nursing home residents or staff (4.52%), air or cruise ship travelers (2.02%), and pregnant women (2.34%), compared against the pooled percentage.

The pooled percentage of asymptomatic infections among the confirmed population was 40.50%, and this percentage was higher in pregnant women (54.11%), air or cruise ship travelers (52.91%), and nursing home residents or staff (47.53%).

The pooled percentage in the tested population was higher than the overall percentage when the mean age of the study population was 60 years or older (3.69%). By contrast, in the confirmed population, the pooled percentage was higher than the overall percentage when the study population was younger than 20 years (60.2%) or aged 20 to 39 years (49.5%).

The researchers noted in their discussion that the varying percentage of asymptomatic individuals according to community prevalence might impact the heterogeneity of the included studies. They also noted the high number of studies conducted in nursing home populations, groups in which asymptomatic individuals were more likely to be tested.

The study findings were limited by several factors, including the potential for missed studies that were not published at the time of the meta-analysis, as well as the exclusion of studies written in Chinese, the researchers noted. Other limitations included lack of follow-up on presymptomatic and covert infections, and the focus on specific populations, factors that may limit the degree to which the results can be generalized.

However, the results highlight the need to screen for asymptomatic infections, especially in countries where COVID-19 has been better controlled, the researchers said. Management strategies for asymptomatic infections, when identified, should include isolation and contact tracing similar to strategies used with confirmed cases, they added. 
 

More testing needed to catch cases early

“During the initial phase of [the] COVID-19 pandemic, testing was not widely available in the United States or the rest of the world,” Setu Patolia, MD, of Saint Louis University School of Medicine, Missouri, said in an interview. Much of the world still lacks access to COVID-19 testing, and early in the pandemic only severely symptomatic patients were tested, he said. “With new variants, particularly the Omicron variant, which may have mild or minimally symptomatic disease, asymptomatic carriers play an important role in propagation of the pandemic,” he explained. “It is important to know the asymptomatic carrier rate among the general population for the future control of [the] pandemic,” he added.

Dr. Patolia said he was surprised by the study finding that one in 400 people in the general population could be asymptomatic carriers of COVID-19.

“Also, nursing home patients are more at risk of complications of COVID, and I expected that they would have a higher rate of symptomatic disease as compared to [the] general population,” said Dr. Patolia. He was also surprised by the high rate of asymptomatic infections in travelers.

“Physicians should be more aware about the asymptomatic carrier rate, particularly in travelers and nursing home patients,” he noted. “Travelers carry high risk of transferring infection from one region to another region of the world, and physicians should advise them to get tested despite the absence of symptoms,” Dr. Patolia emphasized. “Similarly, once any nursing home patient has been diagnosed with COVID-19, physicians should be more careful with the rest of the nursing home patients and test them despite the absence of the symptoms,” he added.

Dr. Patolia also recommended that pregnant women wear masks to help prevent disease transmission when visiting a doctor’s office or labor unit.

Looking ahead, there is a need for cheaper at-home testing kits so that all vulnerable populations can be tested fast and frequently, Dr. Patolia said.

The study was supported by the National Natural Science Foundation of China. The researchers had no financial conflicts to disclose. Dr. Patolia has disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Two distinct gut microbiota subtypes showed an enhanced clinical response to a low FODMAP diet in an analysis of 41 adults with irritable bowel syndrome and household controls.

Irritable bowel syndrome (IBS) has a significant impact on quality of life, and some patients find relief on a low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides and polyols) diet, wrote Kevin Vervier, PhD, of Wellcome Sanger Institute, Hinxton, England, and colleagues. However, the mechanism of action for the success of low FODMAP diets remains unclear, the diet is hard for many patients to follow, and the long-term impact on health is unknown. Therefore, research is needed to identify patients who would derive the most benefit, they said.

In a study published in Gut, the researchers used metagenomics and functional analysis to identify potential biomarkers of response to a low FODMAP diet. They analyzed stool samples from 41 pairs of IBS patients and household contacts. Stool samples were collected at baseline while on usual diets, and again after 4 weeks and 12 weeks on a low FODMAP diet. The patients were divided into two groups based on microbiota clusters; baseline demographics and clinical characteristics were similar between the clusters. In addition, symptom severity was measured using the IBS Severity Scoring System (IBS-SSS).

Cluster 1 was referred to as IBS^P microbiome type because of its pathogenic properties, and cluster 2 as IBS^H microbiome type because of its resemblance to the microbiome of healthy household controls, the researchers wrote.

“We found a significant enrichment of 109 functional pathways and significant depletion of 13 functional pathways in IBS^P microbiomes compared with IBS^H microbiomes,” the researchers said.

More specifically, the IBS^P microbiomes were enriched in Firmicutes and in genes for amino acid and carbohydrate metabolism, at baseline, while the IBS^H microbiomes were similar to healthy controls.

After 4 weeks on the low FODMAP diet, the IBS^P microbiomes normalized, with increased levels of Bacterioides and decreased levels of pathobionts (including Clostridium difficile, Streptococcus parasanguinis, and Paeniclostridium sordellii) to create a microbiome profile resembling the IBSH microbiomes and healthy controls. The taxonomic profile of microbiomes observed in IBS^H and healthy controls did not demonstrate a significant shift.

Although both microbiome groups showed improvement in IBS-SSS scores from baseline on the low FODMAP diet, decreasing from a mean baseline score of 278 to a diet score of 128, the improvement was greater in the IBS^P group than the IBS^H group (delta, 194 vs. 114, respectively; P = .02), the researchers noted. “The shift in the IBS^P microbiota to a healthy profile appeared stable for at least 3 months and correlated with continuing symptomatic well-being,” they wrote.

The distinct responses of the IBS^P and IBS^H microbiomes to the low FODMAP diet suggest a potential mode of action, the researchers said in their discussion. Based on their findings, “it is possible that removal of the eliciting dietary component starves the pathobionts, leading to reduction in their growth and metabolism and a consequent decrease in symptoms, accompanied by an expansion of commensal or symbiotic species leading to a health-associated microbiome,” but more research is needed to prove causality, they said.

The study findings were limited by several factors, including the relatively small sample size, strict inclusion criteria, restriction of medications, and need for participation by household controls, the researchers noted. Other limitations include the inability to control for other factors that could have impacted the gut microbiota, such as the placebo effect and psychological factors, they said.

However, the findings provide a foundation for more research and should be validated in other populations involving different geographical regions and dietary habits, they said. “The identification of a microbial signature ‘biomarker’ that correlates with improved response to a low FODMAP diet may, if validated, allow better stratification and selection of patients likely to benefit from the diet,” they concluded.
 

Setting the stage for focused studies

The low FODMAP diet has demonstrated effectiveness for symptom relief in IBS, although potential risks include exacerbation of disordered eating, nutrition deficiencies, and disrupting gut microbiota, wrote Peter R. Gibson, MD, and Emma P. Halmos, MD, of Monash University and Alfred Health, Melbourne, in an accompanying editorial. However, the current study takes a new step on the journey to identifying patients most likely to respond to a low FODMAP diet, they said.

The editorialists noted three key takeaway points. First, the fecal microbiome may predict response to a low FODMAP diet. Second, the correction of the microbiome through the low FODMAP diet appeared to continue even after the diet was discontinued. “The other intriguing finding was that trehalose metabolic pathways were ‘activated’ in those with dysbiosis,” suggesting that trehalose might be an unrecognized FODMAP, the researchers noted. Trehalose has not been well studied but has been associated with pathogenicity, they said.

Although the study may overemphasize the impact of the low FODMAP diet given the relatively poor assessment of FODMAP intake, “the beauty of Vervier’s work is not in its definitive nature but in that it enables the creation of feasible innovative hypotheses that can be examined by focused studies,” they concluded.

The current study is important because IBS and related disorders of gut-brain interaction are common and greatly impact the quality of life of affected individuals, Jatin Roper, MD, of Duke University in Durham, N.C., said in an interview. Although the mechanisms for improvement are unknown, he said, “The low FODMAP diet is widely used to treat IBS, based on the hypothesis that this diet modifies the gut microbiome in a beneficial way.”

The study authors made two important discoveries, said Dr. Roper. “First, they found that they were able to distinguish IBS versus household controls based on their gut microbial signatures as well expression of key metabolic genes,” he said. “Second, they identified a unique microbiota subtype that was associated with a significant clinical response to the low FODMAP diet in IBS patients; IBS patients with a ‘pathogenic’ microbiome consisting of high Firmicutes and low Bacteroidetes responded to a greater degree to the low FODMAP diet compared to IBS patients with a ‘healthy’ microbiome that was similar to controls,” he explained. “Furthermore, after time on the low FODMAP diet, the IBS patients with pathogenic microbiome signatures developed a microbiome with low Firmicutes and high Bacteroidetes, which is thought to be healthy,” he added.

“These findings are exciting because they suggest that a patient’s microbial signature might be used clinically to predict response to the low FODMAP diet,” said Dr. Roper. “The surprising aspect of these results is that the microbial signature alone was able to predict response to a low FODMAP diet, despite the complex effects of the diet on host physiology and metabolism and the multifactorial etiology of IBS,” he noted. 

However, larger clinical studies are needed to confirm the study findings results in larger patient cohorts and to show that standardized clinical assays can be used to prospectively predict response to dietary interventions such as low FODMAP in IBS, Dr. Roper emphasized.

“This paper provides preliminary and provocative findings that suggest that gut microbiota metabolites may play a role in the pathogenesis of IBS,” said Dr. Roper. “Future basic science and translational research is needed to study the mechanisms by which specific bacterial metabolites regulate intestinal function and disorders such as IBS. I hope that this research will eventually lead to metabolite-based therapies for IBS and other gastrointestinal disorders,” he said.

The study received no outside funding. Lead author Dr. Vervier had no financial conflicts to disclose. Dr. Gibson disclosed authoring two educational/recipe books on the low FODMAP diet, and Monash University financially benefits from the sales of a digital application, booklets, and online courses on the low FODMAP diet. Dr. Halmos had no financial conflicts to disclose. Dr. Roper had no financial conflicts to disclose.

Through the AGA Center for Gut Microbiome Research and Education, AGA is committed to keeping you up-to-speed on the latest news, research and policy updates related to the gut microbiome: www.gastro.org/microbiome. 

Two distinct gut microbiota subtypes showed an enhanced clinical response to a low FODMAP diet in an analysis of 41 adults with irritable bowel syndrome and household controls.

Irritable bowel syndrome (IBS) has a significant impact on quality of life, and some patients find relief on a low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides and polyols) diet, wrote Kevin Vervier, PhD, of Wellcome Sanger Institute, Hinxton, England, and colleagues. However, the mechanism of action for the success of low FODMAP diets remains unclear, the diet is hard for many patients to follow, and the long-term impact on health is unknown. Therefore, research is needed to identify patients who would derive the most benefit, they said.

In a study published in Gut, the researchers used metagenomics and functional analysis to identify potential biomarkers of response to a low FODMAP diet. They analyzed stool samples from 41 pairs of IBS patients and household contacts. Stool samples were collected at baseline while on usual diets, and again after 4 weeks and 12 weeks on a low FODMAP diet. The patients were divided into two groups based on microbiota clusters; baseline demographics and clinical characteristics were similar between the clusters. In addition, symptom severity was measured using the IBS Severity Scoring System (IBS-SSS).

Cluster 1 was referred to as IBS^P microbiome type because of its pathogenic properties, and cluster 2 as IBS^H microbiome type because of its resemblance to the microbiome of healthy household controls, the researchers wrote.

“We found a significant enrichment of 109 functional pathways and significant depletion of 13 functional pathways in IBS^P microbiomes compared with IBS^H microbiomes,” the researchers said.

More specifically, the IBS^P microbiomes were enriched in Firmicutes and in genes for amino acid and carbohydrate metabolism, at baseline, while the IBS^H microbiomes were similar to healthy controls.

After 4 weeks on the low FODMAP diet, the IBS^P microbiomes normalized, with increased levels of Bacterioides and decreased levels of pathobionts (including Clostridium difficile, Streptococcus parasanguinis, and Paeniclostridium sordellii) to create a microbiome profile resembling the IBSH microbiomes and healthy controls. The taxonomic profile of microbiomes observed in IBS^H and healthy controls did not demonstrate a significant shift.

Although both microbiome groups showed improvement in IBS-SSS scores from baseline on the low FODMAP diet, decreasing from a mean baseline score of 278 to a diet score of 128, the improvement was greater in the IBS^P group than the IBS^H group (delta, 194 vs. 114, respectively; P = .02), the researchers noted. “The shift in the IBS^P microbiota to a healthy profile appeared stable for at least 3 months and correlated with continuing symptomatic well-being,” they wrote.

The distinct responses of the IBS^P and IBS^H microbiomes to the low FODMAP diet suggest a potential mode of action, the researchers said in their discussion. Based on their findings, “it is possible that removal of the eliciting dietary component starves the pathobionts, leading to reduction in their growth and metabolism and a consequent decrease in symptoms, accompanied by an expansion of commensal or symbiotic species leading to a health-associated microbiome,” but more research is needed to prove causality, they said.

The study findings were limited by several factors, including the relatively small sample size, strict inclusion criteria, restriction of medications, and need for participation by household controls, the researchers noted. Other limitations include the inability to control for other factors that could have impacted the gut microbiota, such as the placebo effect and psychological factors, they said.

However, the findings provide a foundation for more research and should be validated in other populations involving different geographical regions and dietary habits, they said. “The identification of a microbial signature ‘biomarker’ that correlates with improved response to a low FODMAP diet may, if validated, allow better stratification and selection of patients likely to benefit from the diet,” they concluded.
 

Setting the stage for focused studies

The low FODMAP diet has demonstrated effectiveness for symptom relief in IBS, although potential risks include exacerbation of disordered eating, nutrition deficiencies, and disrupting gut microbiota, wrote Peter R. Gibson, MD, and Emma P. Halmos, MD, of Monash University and Alfred Health, Melbourne, in an accompanying editorial. However, the current study takes a new step on the journey to identifying patients most likely to respond to a low FODMAP diet, they said.

The editorialists noted three key takeaway points. First, the fecal microbiome may predict response to a low FODMAP diet. Second, the correction of the microbiome through the low FODMAP diet appeared to continue even after the diet was discontinued. “The other intriguing finding was that trehalose metabolic pathways were ‘activated’ in those with dysbiosis,” suggesting that trehalose might be an unrecognized FODMAP, the researchers noted. Trehalose has not been well studied but has been associated with pathogenicity, they said.

Although the study may overemphasize the impact of the low FODMAP diet given the relatively poor assessment of FODMAP intake, “the beauty of Vervier’s work is not in its definitive nature but in that it enables the creation of feasible innovative hypotheses that can be examined by focused studies,” they concluded.

The current study is important because IBS and related disorders of gut-brain interaction are common and greatly impact the quality of life of affected individuals, Jatin Roper, MD, of Duke University in Durham, N.C., said in an interview. Although the mechanisms for improvement are unknown, he said, “The low FODMAP diet is widely used to treat IBS, based on the hypothesis that this diet modifies the gut microbiome in a beneficial way.”

The study authors made two important discoveries, said Dr. Roper. “First, they found that they were able to distinguish IBS versus household controls based on their gut microbial signatures as well expression of key metabolic genes,” he said. “Second, they identified a unique microbiota subtype that was associated with a significant clinical response to the low FODMAP diet in IBS patients; IBS patients with a ‘pathogenic’ microbiome consisting of high Firmicutes and low Bacteroidetes responded to a greater degree to the low FODMAP diet compared to IBS patients with a ‘healthy’ microbiome that was similar to controls,” he explained. “Furthermore, after time on the low FODMAP diet, the IBS patients with pathogenic microbiome signatures developed a microbiome with low Firmicutes and high Bacteroidetes, which is thought to be healthy,” he added.

“These findings are exciting because they suggest that a patient’s microbial signature might be used clinically to predict response to the low FODMAP diet,” said Dr. Roper. “The surprising aspect of these results is that the microbial signature alone was able to predict response to a low FODMAP diet, despite the complex effects of the diet on host physiology and metabolism and the multifactorial etiology of IBS,” he noted. 

However, larger clinical studies are needed to confirm the study findings results in larger patient cohorts and to show that standardized clinical assays can be used to prospectively predict response to dietary interventions such as low FODMAP in IBS, Dr. Roper emphasized.

“This paper provides preliminary and provocative findings that suggest that gut microbiota metabolites may play a role in the pathogenesis of IBS,” said Dr. Roper. “Future basic science and translational research is needed to study the mechanisms by which specific bacterial metabolites regulate intestinal function and disorders such as IBS. I hope that this research will eventually lead to metabolite-based therapies for IBS and other gastrointestinal disorders,” he said.

The study received no outside funding. Lead author Dr. Vervier had no financial conflicts to disclose. Dr. Gibson disclosed authoring two educational/recipe books on the low FODMAP diet, and Monash University financially benefits from the sales of a digital application, booklets, and online courses on the low FODMAP diet. Dr. Halmos had no financial conflicts to disclose. Dr. Roper had no financial conflicts to disclose.

Through the AGA Center for Gut Microbiome Research and Education, AGA is committed to keeping you up-to-speed on the latest news, research and policy updates related to the gut microbiome: www.gastro.org/microbiome. 

Two distinct gut microbiota subtypes showed an enhanced clinical response to a low FODMAP diet in an analysis of 41 adults with irritable bowel syndrome and household controls.

Irritable bowel syndrome (IBS) has a significant impact on quality of life, and some patients find relief on a low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides and polyols) diet, wrote Kevin Vervier, PhD, of Wellcome Sanger Institute, Hinxton, England, and colleagues. However, the mechanism of action for the success of low FODMAP diets remains unclear, the diet is hard for many patients to follow, and the long-term impact on health is unknown. Therefore, research is needed to identify patients who would derive the most benefit, they said.

In a study published in Gut, the researchers used metagenomics and functional analysis to identify potential biomarkers of response to a low FODMAP diet. They analyzed stool samples from 41 pairs of IBS patients and household contacts. Stool samples were collected at baseline while on usual diets, and again after 4 weeks and 12 weeks on a low FODMAP diet. The patients were divided into two groups based on microbiota clusters; baseline demographics and clinical characteristics were similar between the clusters. In addition, symptom severity was measured using the IBS Severity Scoring System (IBS-SSS).

Cluster 1 was referred to as IBS^P microbiome type because of its pathogenic properties, and cluster 2 as IBS^H microbiome type because of its resemblance to the microbiome of healthy household controls, the researchers wrote.

“We found a significant enrichment of 109 functional pathways and significant depletion of 13 functional pathways in IBS^P microbiomes compared with IBS^H microbiomes,” the researchers said.

More specifically, the IBS^P microbiomes were enriched in Firmicutes and in genes for amino acid and carbohydrate metabolism, at baseline, while the IBS^H microbiomes were similar to healthy controls.

After 4 weeks on the low FODMAP diet, the IBS^P microbiomes normalized, with increased levels of Bacterioides and decreased levels of pathobionts (including Clostridium difficile, Streptococcus parasanguinis, and Paeniclostridium sordellii) to create a microbiome profile resembling the IBSH microbiomes and healthy controls. The taxonomic profile of microbiomes observed in IBS^H and healthy controls did not demonstrate a significant shift.

Although both microbiome groups showed improvement in IBS-SSS scores from baseline on the low FODMAP diet, decreasing from a mean baseline score of 278 to a diet score of 128, the improvement was greater in the IBS^P group than the IBS^H group (delta, 194 vs. 114, respectively; P = .02), the researchers noted. “The shift in the IBS^P microbiota to a healthy profile appeared stable for at least 3 months and correlated with continuing symptomatic well-being,” they wrote.

The distinct responses of the IBS^P and IBS^H microbiomes to the low FODMAP diet suggest a potential mode of action, the researchers said in their discussion. Based on their findings, “it is possible that removal of the eliciting dietary component starves the pathobionts, leading to reduction in their growth and metabolism and a consequent decrease in symptoms, accompanied by an expansion of commensal or symbiotic species leading to a health-associated microbiome,” but more research is needed to prove causality, they said.

The study findings were limited by several factors, including the relatively small sample size, strict inclusion criteria, restriction of medications, and need for participation by household controls, the researchers noted. Other limitations include the inability to control for other factors that could have impacted the gut microbiota, such as the placebo effect and psychological factors, they said.

However, the findings provide a foundation for more research and should be validated in other populations involving different geographical regions and dietary habits, they said. “The identification of a microbial signature ‘biomarker’ that correlates with improved response to a low FODMAP diet may, if validated, allow better stratification and selection of patients likely to benefit from the diet,” they concluded.
 

Setting the stage for focused studies

The low FODMAP diet has demonstrated effectiveness for symptom relief in IBS, although potential risks include exacerbation of disordered eating, nutrition deficiencies, and disrupting gut microbiota, wrote Peter R. Gibson, MD, and Emma P. Halmos, MD, of Monash University and Alfred Health, Melbourne, in an accompanying editorial. However, the current study takes a new step on the journey to identifying patients most likely to respond to a low FODMAP diet, they said.

The editorialists noted three key takeaway points. First, the fecal microbiome may predict response to a low FODMAP diet. Second, the correction of the microbiome through the low FODMAP diet appeared to continue even after the diet was discontinued. “The other intriguing finding was that trehalose metabolic pathways were ‘activated’ in those with dysbiosis,” suggesting that trehalose might be an unrecognized FODMAP, the researchers noted. Trehalose has not been well studied but has been associated with pathogenicity, they said.

Although the study may overemphasize the impact of the low FODMAP diet given the relatively poor assessment of FODMAP intake, “the beauty of Vervier’s work is not in its definitive nature but in that it enables the creation of feasible innovative hypotheses that can be examined by focused studies,” they concluded.

The current study is important because IBS and related disorders of gut-brain interaction are common and greatly impact the quality of life of affected individuals, Jatin Roper, MD, of Duke University in Durham, N.C., said in an interview. Although the mechanisms for improvement are unknown, he said, “The low FODMAP diet is widely used to treat IBS, based on the hypothesis that this diet modifies the gut microbiome in a beneficial way.”

The study authors made two important discoveries, said Dr. Roper. “First, they found that they were able to distinguish IBS versus household controls based on their gut microbial signatures as well expression of key metabolic genes,” he said. “Second, they identified a unique microbiota subtype that was associated with a significant clinical response to the low FODMAP diet in IBS patients; IBS patients with a ‘pathogenic’ microbiome consisting of high Firmicutes and low Bacteroidetes responded to a greater degree to the low FODMAP diet compared to IBS patients with a ‘healthy’ microbiome that was similar to controls,” he explained. “Furthermore, after time on the low FODMAP diet, the IBS patients with pathogenic microbiome signatures developed a microbiome with low Firmicutes and high Bacteroidetes, which is thought to be healthy,” he added.

“These findings are exciting because they suggest that a patient’s microbial signature might be used clinically to predict response to the low FODMAP diet,” said Dr. Roper. “The surprising aspect of these results is that the microbial signature alone was able to predict response to a low FODMAP diet, despite the complex effects of the diet on host physiology and metabolism and the multifactorial etiology of IBS,” he noted. 

However, larger clinical studies are needed to confirm the study findings results in larger patient cohorts and to show that standardized clinical assays can be used to prospectively predict response to dietary interventions such as low FODMAP in IBS, Dr. Roper emphasized.

“This paper provides preliminary and provocative findings that suggest that gut microbiota metabolites may play a role in the pathogenesis of IBS,” said Dr. Roper. “Future basic science and translational research is needed to study the mechanisms by which specific bacterial metabolites regulate intestinal function and disorders such as IBS. I hope that this research will eventually lead to metabolite-based therapies for IBS and other gastrointestinal disorders,” he said.

The study received no outside funding. Lead author Dr. Vervier had no financial conflicts to disclose. Dr. Gibson disclosed authoring two educational/recipe books on the low FODMAP diet, and Monash University financially benefits from the sales of a digital application, booklets, and online courses on the low FODMAP diet. Dr. Halmos had no financial conflicts to disclose. Dr. Roper had no financial conflicts to disclose.

Through the AGA Center for Gut Microbiome Research and Education, AGA is committed to keeping you up-to-speed on the latest news, research and policy updates related to the gut microbiome: www.gastro.org/microbiome. 

Adapted D-dimer thresholds based on pretest probability were effective for ruling out pulmonary embolism (PE) in subgroups of high-risk individuals without the use of imaging in a review of data.

In a patient suspected to have a PE, “diagnosis is made radiographically, usually with CT pulmonary angiogram, or V/Q scan,” Suman Pal, MD, of the University of New Mexico, Albuquerque, said in an interview.

“Validated clinical decision tools such as Wells’ score or Geneva score may be used to identify patients at low pretest probability of PE who may initially get a D-dimer level check, followed by imaging only if D-dimer level is elevated,” explained Dr. Pal, who was not involved with the new research, which was published in the Annals of Internal Medicine.

According to the authors of the new paper, while current diagnostic strategies in patients with suspected PE include use of a validated clinical decision rule (CDR) and D-dimer testing to rule out PE without imaging tests, the effectiveness of D-dimer tests in older patients, inpatients, cancer patients, and other high-risk groups has not been well-studied.

Lead author of the paper, Milou A.M. Stals, MD, and colleagues said their goal was to evaluate the safety and efficiency of the Wells rule and revised Geneva score in combination with D-dimer tests, and also the YEARS algorithm for D-dimer thresholds, in their paper.

Dr. Stals, of Leiden (the Netherlands) University Medical Center, and the coinvestigators conducted an international systemic review and individual patient data meta-analysis that included 16 studies and 20,553 patients, with all studies having been published between Jan. 1, 1995, and Jan. 1, 2021. Their primary outcomes were the safety and efficiency of each of these three strategies.

In the review, the researchers defined safety as the 3-month incidence of venous thromboembolism after PE was ruled out without imaging at baseline. They defined efficiency as the proportion patients for whom PE was ruled out based on D-dimer thresholds without imaging.

Overall, efficiency was highest in the subset of patients aged younger than 40 years, ranging from 47% to 68% in this group. Efficiency was lowest in patients aged 80 years and older (6.0%-23%), and in patients with cancer (9.6%-26%).

The efficiency was higher when D-dimer thresholds based on pretest probability were used, compared with when fixed or age-adjusted D-dimer thresholds were used.

The key finding was the significant variability in performance of the diagnostic strategies, the researchers said.

“The predicted failure rate was generally highest for strategies incorporating adapted D-dimer thresholds. However, at the same time, predicted overall efficiency was substantially higher with these strategies versus strategies with a fixed D-dimer threshold as well,” they said. Given that the benefits of each of the three diagnostic strategies depends on their correct application, the researchers recommended that an individual hospitalist choose one strategy for their institution.

“Whether clinicians should rely on the Wells rule, the YEARS algorithm, or the revised Geneva score becomes a matter of local preference and experience,” Dr. Stals and colleagues wrote.

The study findings were limited by several factors including between-study differences in scoring predictors and D-dimer assays. Another limitation was that differential verification biases for classifying fatal events and PE may have contributed to overestimation of failure rates of the adapted D-dimer thresholds.

Strengths of the study included its large sample size and original data on pretest probability, and that data support the use of any of the three strategies for ruling out PE in the identified subgroups without the need for imaging tests, the authors wrote.

“Pending the results of ongoing diagnostic randomized trials, physicians and guideline committees should balance the interlink between safety and efficiency of available diagnostic strategies,” they concluded.

Adapted D-dimer benefits some patients

“Clearly, increasing the D-dimer cutoff will lower the number of patients who require radiographic imaging (improved specificity), but this comes with a risk for missing PE (lower sensitivity). Is this risk worth taking?” Daniel J. Brotman, MD, of Johns Hopkins University, Baltimore, asked in an editorial accompanying the new study.

Dr. Brotman was not surprised by the study findings.

“Conditions that predispose to thrombosis through activated hemostasis – such as advanced age, cancer, inflammation, prolonged hospitalization, and trauma – drive D-dimer levels higher independent of the presence or absence of radiographically apparent thrombosis,” he said. However, these patients are unlikely to have normal D-dimer levels regardless of the cutoff used.

Adapted D-dimer cutoffs may benefit some patients, including those with contraindications or limited access to imaging, said Dr. Brotman. D-dimer may be used for risk stratification regardless of PE, since patients with marginally elevated D-dimers have better prognoses than those with higher D-dimer elevations, even if a small PE is missed.

Dr. Brotman wrote that increasing D-dimer cutoffs for high-risk patients in the subgroups analyzed may spare some patients radiographic testing, but doing so carries an increased risk for diagnostic failure. Overall, “the important work by Stals and colleagues offers reassurance that modifying D-dimer thresholds according to age or pretest probability is safe enough for widespread practice, even in high-risk groups.”
 

Focus on single strategy ‘based on local needs’

“Several validated clinical decision tools, along with age or pretest probability adjusted D-dimer threshold are currently in use as diagnostic strategies for ruling out pulmonary embolism,” Dr. Pal said in an interview.

The current study is important because of limited data on the performance of these strategies in specific subgroups of patients whose risk of PE may differ from the overall patient population, he noted.

“Different diagnostic strategies for PE have a variable performance in patients with differences of age, active cancer, and history of VTE,” said Dr. Pal. “However, in this study, no clear preference for one strategy over others could be established for these subgroups, and clinicians should continue to follow institution-specific guidance.

“A single strategy should be adopted at each institution based on local needs and used as the standard of care until further data are available,” he said.

“The use of D-dimer to rule out PE, either with fixed threshold or age-adjusted thresholds, can be confounded in clinical settings by other comorbid conditions such as sepsis, recent surgery, and more recently, COVID-19,” he said.

“Since the findings of this study do not show a clear benefit of one diagnostic strategy over others in the analyzed subgroups of patients, further prospective head-to-head comparison among the subgroups of interest would be helpful to guide clinical decision making,” Dr. Pal added.
 

YEARS-specific study supports D-dimer safety and value

A recent paper published in JAMA supported the results of the meta-analysis. In that study, Yonathan Freund, MD, of Sorbonne Université, Paris, and colleagues focused on the YEARS strategy combined with age-adjusted D-dimer thresholds as a way to rule out PE in PERC-positive ED patients.

The authors of this paper randomized 18 EDs to either a protocol of intervention followed by control, or control followed by intervention. The study population included 726 patients in the intervention group and 688 in the control group.

The intervention strategy to rule out PE consisted of assessing the YEARS criteria and D-dimer testing. PE was ruled out in patients with no YEARS criteria and a D-dimer level below 1,000 ng/mL and in patients with one or more YEARS criteria and D-dimers below an age-adjusted threshold (defined as age times 10 ng/mL in patients aged 50 years and older).

The control strategy consisted of D-dimer testing for all patients with the threshold at age-adjusted levels; D-dimers about these levels prompted chest imaging.

Overall, the risk of a missed VTE at 3 months was noninferior between the groups (0.15% in the intervention group and 0.80% in the controls).

“The intervention was associated with a statistically significant reduction in chest imaging use,” the researchers wrote.

This study’s findings were limited by randomization at the center level, rather than the patient level, and the use of imaging on some patients despite negative D-dimer tests, the researchers wrote. However, their findings support those of previous studies and especially support the safety of the intervention, in an emergency medicine setting, as no PEs occurred in patients with a YEARS score of zero who underwent the intervention.
 

Downsides to applying algorithms to every patient explained

In an editorial accompanying the JAMA study, Marcel Levi, MD, and Nick van Es, MD, of Amsterdam University Medical Center, emphasized the challenges of diagnosing PE given that many patients present with nonspecific clinical manifestations and without typical signs and symptoms. High-resolution CT pulmonary angiography allows for a fast and easy diagnosis in an emergency setting. However, efforts are ongoing to develop alternative strategies that avoid unnecessary scanning for potential PE patients, many of whom have alternative diagnoses such as pulmonary infections, cardiac conditions, pleural disease, or musculoskeletal problems.

On review of the JAMA study using the YEARS rule with adjusted D-dimer thresholds, the editorialists noted that the data were robust and indicated a 10% reduction in chest imaging. They also emphasized the potential to overwhelm busy clinicians with more algorithms.

“Blindly applying algorithms to every patient may be less appropriate or even undesirable in specific situations in which deviation from the rules on clinical grounds is indicated,” but a complex imaging approach may be time consuming and challenging in the acute setting, and a simple algorithm may be safe and efficient in many cases, they wrote. “From a patient perspective, a negative diagnostic algorithm for pulmonary embolism does not diminish the physician’s obligation to consider other diagnoses that explain the symptoms, for which chest CT scans may still be needed and helpful.”

The Annals of Internal Medicine study was supported by the Dutch Research Council. The JAMA study was supported by the French Health Ministry. Dr. Stals, Dr. Freund, Dr. Pal, Dr. Levi, and Dr. van Es had no financial conflicts to disclose.

Adapted D-dimer thresholds based on pretest probability were effective for ruling out pulmonary embolism (PE) in subgroups of high-risk individuals without the use of imaging in a review of data.

In a patient suspected to have a PE, “diagnosis is made radiographically, usually with CT pulmonary angiogram, or V/Q scan,” Suman Pal, MD, of the University of New Mexico, Albuquerque, said in an interview.

“Validated clinical decision tools such as Wells’ score or Geneva score may be used to identify patients at low pretest probability of PE who may initially get a D-dimer level check, followed by imaging only if D-dimer level is elevated,” explained Dr. Pal, who was not involved with the new research, which was published in the Annals of Internal Medicine.

According to the authors of the new paper, while current diagnostic strategies in patients with suspected PE include use of a validated clinical decision rule (CDR) and D-dimer testing to rule out PE without imaging tests, the effectiveness of D-dimer tests in older patients, inpatients, cancer patients, and other high-risk groups has not been well-studied.

Lead author of the paper, Milou A.M. Stals, MD, and colleagues said their goal was to evaluate the safety and efficiency of the Wells rule and revised Geneva score in combination with D-dimer tests, and also the YEARS algorithm for D-dimer thresholds, in their paper.

Dr. Stals, of Leiden (the Netherlands) University Medical Center, and the coinvestigators conducted an international systemic review and individual patient data meta-analysis that included 16 studies and 20,553 patients, with all studies having been published between Jan. 1, 1995, and Jan. 1, 2021. Their primary outcomes were the safety and efficiency of each of these three strategies.

In the review, the researchers defined safety as the 3-month incidence of venous thromboembolism after PE was ruled out without imaging at baseline. They defined efficiency as the proportion patients for whom PE was ruled out based on D-dimer thresholds without imaging.

Overall, efficiency was highest in the subset of patients aged younger than 40 years, ranging from 47% to 68% in this group. Efficiency was lowest in patients aged 80 years and older (6.0%-23%), and in patients with cancer (9.6%-26%).

The efficiency was higher when D-dimer thresholds based on pretest probability were used, compared with when fixed or age-adjusted D-dimer thresholds were used.

The key finding was the significant variability in performance of the diagnostic strategies, the researchers said.

“The predicted failure rate was generally highest for strategies incorporating adapted D-dimer thresholds. However, at the same time, predicted overall efficiency was substantially higher with these strategies versus strategies with a fixed D-dimer threshold as well,” they said. Given that the benefits of each of the three diagnostic strategies depends on their correct application, the researchers recommended that an individual hospitalist choose one strategy for their institution.

“Whether clinicians should rely on the Wells rule, the YEARS algorithm, or the revised Geneva score becomes a matter of local preference and experience,” Dr. Stals and colleagues wrote.

The study findings were limited by several factors including between-study differences in scoring predictors and D-dimer assays. Another limitation was that differential verification biases for classifying fatal events and PE may have contributed to overestimation of failure rates of the adapted D-dimer thresholds.

Strengths of the study included its large sample size and original data on pretest probability, and that data support the use of any of the three strategies for ruling out PE in the identified subgroups without the need for imaging tests, the authors wrote.

“Pending the results of ongoing diagnostic randomized trials, physicians and guideline committees should balance the interlink between safety and efficiency of available diagnostic strategies,” they concluded.

Adapted D-dimer benefits some patients

“Clearly, increasing the D-dimer cutoff will lower the number of patients who require radiographic imaging (improved specificity), but this comes with a risk for missing PE (lower sensitivity). Is this risk worth taking?” Daniel J. Brotman, MD, of Johns Hopkins University, Baltimore, asked in an editorial accompanying the new study.

Dr. Brotman was not surprised by the study findings.

“Conditions that predispose to thrombosis through activated hemostasis – such as advanced age, cancer, inflammation, prolonged hospitalization, and trauma – drive D-dimer levels higher independent of the presence or absence of radiographically apparent thrombosis,” he said. However, these patients are unlikely to have normal D-dimer levels regardless of the cutoff used.

Adapted D-dimer cutoffs may benefit some patients, including those with contraindications or limited access to imaging, said Dr. Brotman. D-dimer may be used for risk stratification regardless of PE, since patients with marginally elevated D-dimers have better prognoses than those with higher D-dimer elevations, even if a small PE is missed.

Dr. Brotman wrote that increasing D-dimer cutoffs for high-risk patients in the subgroups analyzed may spare some patients radiographic testing, but doing so carries an increased risk for diagnostic failure. Overall, “the important work by Stals and colleagues offers reassurance that modifying D-dimer thresholds according to age or pretest probability is safe enough for widespread practice, even in high-risk groups.”
 

Focus on single strategy ‘based on local needs’

“Several validated clinical decision tools, along with age or pretest probability adjusted D-dimer threshold are currently in use as diagnostic strategies for ruling out pulmonary embolism,” Dr. Pal said in an interview.

The current study is important because of limited data on the performance of these strategies in specific subgroups of patients whose risk of PE may differ from the overall patient population, he noted.

“Different diagnostic strategies for PE have a variable performance in patients with differences of age, active cancer, and history of VTE,” said Dr. Pal. “However, in this study, no clear preference for one strategy over others could be established for these subgroups, and clinicians should continue to follow institution-specific guidance.

“A single strategy should be adopted at each institution based on local needs and used as the standard of care until further data are available,” he said.

“The use of D-dimer to rule out PE, either with fixed threshold or age-adjusted thresholds, can be confounded in clinical settings by other comorbid conditions such as sepsis, recent surgery, and more recently, COVID-19,” he said.

“Since the findings of this study do not show a clear benefit of one diagnostic strategy over others in the analyzed subgroups of patients, further prospective head-to-head comparison among the subgroups of interest would be helpful to guide clinical decision making,” Dr. Pal added.
 

YEARS-specific study supports D-dimer safety and value

A recent paper published in JAMA supported the results of the meta-analysis. In that study, Yonathan Freund, MD, of Sorbonne Université, Paris, and colleagues focused on the YEARS strategy combined with age-adjusted D-dimer thresholds as a way to rule out PE in PERC-positive ED patients.

The authors of this paper randomized 18 EDs to either a protocol of intervention followed by control, or control followed by intervention. The study population included 726 patients in the intervention group and 688 in the control group.

The intervention strategy to rule out PE consisted of assessing the YEARS criteria and D-dimer testing. PE was ruled out in patients with no YEARS criteria and a D-dimer level below 1,000 ng/mL and in patients with one or more YEARS criteria and D-dimers below an age-adjusted threshold (defined as age times 10 ng/mL in patients aged 50 years and older).

The control strategy consisted of D-dimer testing for all patients with the threshold at age-adjusted levels; D-dimers about these levels prompted chest imaging.

Overall, the risk of a missed VTE at 3 months was noninferior between the groups (0.15% in the intervention group and 0.80% in the controls).

“The intervention was associated with a statistically significant reduction in chest imaging use,” the researchers wrote.

This study’s findings were limited by randomization at the center level, rather than the patient level, and the use of imaging on some patients despite negative D-dimer tests, the researchers wrote. However, their findings support those of previous studies and especially support the safety of the intervention, in an emergency medicine setting, as no PEs occurred in patients with a YEARS score of zero who underwent the intervention.
 

Downsides to applying algorithms to every patient explained

In an editorial accompanying the JAMA study, Marcel Levi, MD, and Nick van Es, MD, of Amsterdam University Medical Center, emphasized the challenges of diagnosing PE given that many patients present with nonspecific clinical manifestations and without typical signs and symptoms. High-resolution CT pulmonary angiography allows for a fast and easy diagnosis in an emergency setting. However, efforts are ongoing to develop alternative strategies that avoid unnecessary scanning for potential PE patients, many of whom have alternative diagnoses such as pulmonary infections, cardiac conditions, pleural disease, or musculoskeletal problems.

On review of the JAMA study using the YEARS rule with adjusted D-dimer thresholds, the editorialists noted that the data were robust and indicated a 10% reduction in chest imaging. They also emphasized the potential to overwhelm busy clinicians with more algorithms.

“Blindly applying algorithms to every patient may be less appropriate or even undesirable in specific situations in which deviation from the rules on clinical grounds is indicated,” but a complex imaging approach may be time consuming and challenging in the acute setting, and a simple algorithm may be safe and efficient in many cases, they wrote. “From a patient perspective, a negative diagnostic algorithm for pulmonary embolism does not diminish the physician’s obligation to consider other diagnoses that explain the symptoms, for which chest CT scans may still be needed and helpful.”

The Annals of Internal Medicine study was supported by the Dutch Research Council. The JAMA study was supported by the French Health Ministry. Dr. Stals, Dr. Freund, Dr. Pal, Dr. Levi, and Dr. van Es had no financial conflicts to disclose.

Adapted D-dimer thresholds based on pretest probability were effective for ruling out pulmonary embolism (PE) in subgroups of high-risk individuals without the use of imaging in a review of data.

In a patient suspected to have a PE, “diagnosis is made radiographically, usually with CT pulmonary angiogram, or V/Q scan,” Suman Pal, MD, of the University of New Mexico, Albuquerque, said in an interview.

“Validated clinical decision tools such as Wells’ score or Geneva score may be used to identify patients at low pretest probability of PE who may initially get a D-dimer level check, followed by imaging only if D-dimer level is elevated,” explained Dr. Pal, who was not involved with the new research, which was published in the Annals of Internal Medicine.

According to the authors of the new paper, while current diagnostic strategies in patients with suspected PE include use of a validated clinical decision rule (CDR) and D-dimer testing to rule out PE without imaging tests, the effectiveness of D-dimer tests in older patients, inpatients, cancer patients, and other high-risk groups has not been well-studied.

Lead author of the paper, Milou A.M. Stals, MD, and colleagues said their goal was to evaluate the safety and efficiency of the Wells rule and revised Geneva score in combination with D-dimer tests, and also the YEARS algorithm for D-dimer thresholds, in their paper.

Dr. Stals, of Leiden (the Netherlands) University Medical Center, and the coinvestigators conducted an international systemic review and individual patient data meta-analysis that included 16 studies and 20,553 patients, with all studies having been published between Jan. 1, 1995, and Jan. 1, 2021. Their primary outcomes were the safety and efficiency of each of these three strategies.

In the review, the researchers defined safety as the 3-month incidence of venous thromboembolism after PE was ruled out without imaging at baseline. They defined efficiency as the proportion patients for whom PE was ruled out based on D-dimer thresholds without imaging.

Overall, efficiency was highest in the subset of patients aged younger than 40 years, ranging from 47% to 68% in this group. Efficiency was lowest in patients aged 80 years and older (6.0%-23%), and in patients with cancer (9.6%-26%).

The efficiency was higher when D-dimer thresholds based on pretest probability were used, compared with when fixed or age-adjusted D-dimer thresholds were used.

The key finding was the significant variability in performance of the diagnostic strategies, the researchers said.

“The predicted failure rate was generally highest for strategies incorporating adapted D-dimer thresholds. However, at the same time, predicted overall efficiency was substantially higher with these strategies versus strategies with a fixed D-dimer threshold as well,” they said. Given that the benefits of each of the three diagnostic strategies depends on their correct application, the researchers recommended that an individual hospitalist choose one strategy for their institution.

“Whether clinicians should rely on the Wells rule, the YEARS algorithm, or the revised Geneva score becomes a matter of local preference and experience,” Dr. Stals and colleagues wrote.

The study findings were limited by several factors including between-study differences in scoring predictors and D-dimer assays. Another limitation was that differential verification biases for classifying fatal events and PE may have contributed to overestimation of failure rates of the adapted D-dimer thresholds.

Strengths of the study included its large sample size and original data on pretest probability, and that data support the use of any of the three strategies for ruling out PE in the identified subgroups without the need for imaging tests, the authors wrote.

“Pending the results of ongoing diagnostic randomized trials, physicians and guideline committees should balance the interlink between safety and efficiency of available diagnostic strategies,” they concluded.

Adapted D-dimer benefits some patients

“Clearly, increasing the D-dimer cutoff will lower the number of patients who require radiographic imaging (improved specificity), but this comes with a risk for missing PE (lower sensitivity). Is this risk worth taking?” Daniel J. Brotman, MD, of Johns Hopkins University, Baltimore, asked in an editorial accompanying the new study.

Dr. Brotman was not surprised by the study findings.

“Conditions that predispose to thrombosis through activated hemostasis – such as advanced age, cancer, inflammation, prolonged hospitalization, and trauma – drive D-dimer levels higher independent of the presence or absence of radiographically apparent thrombosis,” he said. However, these patients are unlikely to have normal D-dimer levels regardless of the cutoff used.

Adapted D-dimer cutoffs may benefit some patients, including those with contraindications or limited access to imaging, said Dr. Brotman. D-dimer may be used for risk stratification regardless of PE, since patients with marginally elevated D-dimers have better prognoses than those with higher D-dimer elevations, even if a small PE is missed.

Dr. Brotman wrote that increasing D-dimer cutoffs for high-risk patients in the subgroups analyzed may spare some patients radiographic testing, but doing so carries an increased risk for diagnostic failure. Overall, “the important work by Stals and colleagues offers reassurance that modifying D-dimer thresholds according to age or pretest probability is safe enough for widespread practice, even in high-risk groups.”
 

Focus on single strategy ‘based on local needs’

“Several validated clinical decision tools, along with age or pretest probability adjusted D-dimer threshold are currently in use as diagnostic strategies for ruling out pulmonary embolism,” Dr. Pal said in an interview.

The current study is important because of limited data on the performance of these strategies in specific subgroups of patients whose risk of PE may differ from the overall patient population, he noted.

“Different diagnostic strategies for PE have a variable performance in patients with differences of age, active cancer, and history of VTE,” said Dr. Pal. “However, in this study, no clear preference for one strategy over others could be established for these subgroups, and clinicians should continue to follow institution-specific guidance.

“A single strategy should be adopted at each institution based on local needs and used as the standard of care until further data are available,” he said.

“The use of D-dimer to rule out PE, either with fixed threshold or age-adjusted thresholds, can be confounded in clinical settings by other comorbid conditions such as sepsis, recent surgery, and more recently, COVID-19,” he said.

“Since the findings of this study do not show a clear benefit of one diagnostic strategy over others in the analyzed subgroups of patients, further prospective head-to-head comparison among the subgroups of interest would be helpful to guide clinical decision making,” Dr. Pal added.
 

YEARS-specific study supports D-dimer safety and value

A recent paper published in JAMA supported the results of the meta-analysis. In that study, Yonathan Freund, MD, of Sorbonne Université, Paris, and colleagues focused on the YEARS strategy combined with age-adjusted D-dimer thresholds as a way to rule out PE in PERC-positive ED patients.

The authors of this paper randomized 18 EDs to either a protocol of intervention followed by control, or control followed by intervention. The study population included 726 patients in the intervention group and 688 in the control group.

The intervention strategy to rule out PE consisted of assessing the YEARS criteria and D-dimer testing. PE was ruled out in patients with no YEARS criteria and a D-dimer level below 1,000 ng/mL and in patients with one or more YEARS criteria and D-dimers below an age-adjusted threshold (defined as age times 10 ng/mL in patients aged 50 years and older).

The control strategy consisted of D-dimer testing for all patients with the threshold at age-adjusted levels; D-dimers about these levels prompted chest imaging.

Overall, the risk of a missed VTE at 3 months was noninferior between the groups (0.15% in the intervention group and 0.80% in the controls).

“The intervention was associated with a statistically significant reduction in chest imaging use,” the researchers wrote.

This study’s findings were limited by randomization at the center level, rather than the patient level, and the use of imaging on some patients despite negative D-dimer tests, the researchers wrote. However, their findings support those of previous studies and especially support the safety of the intervention, in an emergency medicine setting, as no PEs occurred in patients with a YEARS score of zero who underwent the intervention.
 

Downsides to applying algorithms to every patient explained

In an editorial accompanying the JAMA study, Marcel Levi, MD, and Nick van Es, MD, of Amsterdam University Medical Center, emphasized the challenges of diagnosing PE given that many patients present with nonspecific clinical manifestations and without typical signs and symptoms. High-resolution CT pulmonary angiography allows for a fast and easy diagnosis in an emergency setting. However, efforts are ongoing to develop alternative strategies that avoid unnecessary scanning for potential PE patients, many of whom have alternative diagnoses such as pulmonary infections, cardiac conditions, pleural disease, or musculoskeletal problems.

On review of the JAMA study using the YEARS rule with adjusted D-dimer thresholds, the editorialists noted that the data were robust and indicated a 10% reduction in chest imaging. They also emphasized the potential to overwhelm busy clinicians with more algorithms.

“Blindly applying algorithms to every patient may be less appropriate or even undesirable in specific situations in which deviation from the rules on clinical grounds is indicated,” but a complex imaging approach may be time consuming and challenging in the acute setting, and a simple algorithm may be safe and efficient in many cases, they wrote. “From a patient perspective, a negative diagnostic algorithm for pulmonary embolism does not diminish the physician’s obligation to consider other diagnoses that explain the symptoms, for which chest CT scans may still be needed and helpful.”

The Annals of Internal Medicine study was supported by the Dutch Research Council. The JAMA study was supported by the French Health Ministry. Dr. Stals, Dr. Freund, Dr. Pal, Dr. Levi, and Dr. van Es had no financial conflicts to disclose.

Two distinct gut microbiota subtypes showed an enhanced clinical response to a low FODMAP diet in an analysis of 41 adults with irritable bowel syndrome and household controls.

Irritable bowel syndrome (IBS) has a significant impact on quality of life, and some patients find relief on a low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides and polyols) diet, wrote Kevin Vervier, PhD, of Wellcome Sanger Institute, Hinxton, England, and colleagues. However, the mechanism of action for the success of low FODMAP diets remains unclear, the diet is hard for many patients to follow, and the long-term impact on health is unknown. Therefore, research is needed to identify patients who would derive the most benefit, they said.

In a study published in Gut, the researchers used metagenomics and functional analysis to identify potential biomarkers of response to a low FODMAP diet. They analyzed stool samples from 41 pairs of IBS patients and household contacts. Stool samples were collected at baseline while on usual diets, and again after 4 weeks and 12 weeks on a low FODMAP diet. The patients were divided into two groups based on microbiota clusters; baseline demographics and clinical characteristics were similar between the clusters. In addition, symptom severity was measured using the IBS Severity Scoring System (IBS-SSS).

Cluster 1 was referred to as IBS^P microbiome type because of its pathogenic properties, and cluster 2 as IBS^H microbiome type because of its resemblance to the microbiome of healthy household controls, the researchers wrote.

“We found a significant enrichment of 109 functional pathways and significant depletion of 13 functional pathways in IBS^P microbiomes compared with IBS^H microbiomes,” the researchers said.

More specifically, the IBS^P microbiomes were enriched in Firmicutes and in genes for amino acid and carbohydrate metabolism, at baseline, while the IBS^H microbiomes were similar to healthy controls.

After 4 weeks on the low FODMAP diet, the IBS^P microbiomes normalized, with increased levels of Bacterioides and decreased levels of pathobionts (including Clostridium difficile, Streptococcus parasanguinis, and Paeniclostridium sordellii) to create a microbiome profile resembling the IBSH microbiomes and healthy controls. The taxonomic profile of microbiomes observed in IBS^H and healthy controls did not demonstrate a significant shift.

Although both microbiome groups showed improvement in IBS-SSS scores from baseline on the low FODMAP diet, decreasing from a mean baseline score of 278 to a diet score of 128, the improvement was greater in the IBS^P group than the IBS^H group (delta, 194 vs. 114, respectively; P = .02), the researchers noted. “The shift in the IBS^P microbiota to a healthy profile appeared stable for at least 3 months and correlated with continuing symptomatic well-being,” they wrote.

The distinct responses of the IBS^P and IBS^H microbiomes to the low FODMAP diet suggest a potential mode of action, the researchers said in their discussion. Based on their findings, “it is possible that removal of the eliciting dietary component starves the pathobionts, leading to reduction in their growth and metabolism and a consequent decrease in symptoms, accompanied by an expansion of commensal or symbiotic species leading to a health-associated microbiome,” but more research is needed to prove causality, they said.

The study findings were limited by several factors, including the relatively small sample size, strict inclusion criteria, restriction of medications, and need for participation by household controls, the researchers noted. Other limitations include the inability to control for other factors that could have impacted the gut microbiota, such as the placebo effect and psychological factors, they said.

However, the findings provide a foundation for more research and should be validated in other populations involving different geographical regions and dietary habits, they said. “The identification of a microbial signature ‘biomarker’ that correlates with improved response to a low FODMAP diet may, if validated, allow better stratification and selection of patients likely to benefit from the diet,” they concluded.
 

Setting the stage for focused studies

The low FODMAP diet has demonstrated effectiveness for symptom relief in IBS, although potential risks include exacerbation of disordered eating, nutrition deficiencies, and disrupting gut microbiota, wrote Peter R. Gibson, MD, and Emma P. Halmos, MD, of Monash University and Alfred Health, Melbourne, in an accompanying editorial. However, the current study takes a new step on the journey to identifying patients most likely to respond to a low FODMAP diet, they said.

The editorialists noted three key takeaway points. First, the fecal microbiome may predict response to a low FODMAP diet. Second, the correction of the microbiome through the low FODMAP diet appeared to continue even after the diet was discontinued. “The other intriguing finding was that trehalose metabolic pathways were ‘activated’ in those with dysbiosis,” suggesting that trehalose might be an unrecognized FODMAP, the researchers noted. Trehalose has not been well studied but has been associated with pathogenicity, they said.

Although the study may overemphasize the impact of the low FODMAP diet given the relatively poor assessment of FODMAP intake, “the beauty of Vervier’s work is not in its definitive nature but in that it enables the creation of feasible innovative hypotheses that can be examined by focused studies,” they concluded.

The current study is important because IBS and related disorders of gut-brain interaction are common and greatly impact the quality of life of affected individuals, Jatin Roper, MD, of Duke University in Durham, N.C., said in an interview. Although the mechanisms for improvement are unknown, he said, “The low FODMAP diet is widely used to treat IBS, based on the hypothesis that this diet modifies the gut microbiome in a beneficial way.”

The study authors made two important discoveries, said Dr. Roper. “First, they found that they were able to distinguish IBS versus household controls based on their gut microbial signatures as well expression of key metabolic genes,” he said. “Second, they identified a unique microbiota subtype that was associated with a significant clinical response to the low FODMAP diet in IBS patients; IBS patients with a ‘pathogenic’ microbiome consisting of high Firmicutes and low Bacteroidetes responded to a greater degree to the low FODMAP diet compared to IBS patients with a ‘healthy’ microbiome that was similar to controls,” he explained. “Furthermore, after time on the low FODMAP diet, the IBS patients with pathogenic microbiome signatures developed a microbiome with low Firmicutes and high Bacteroidetes, which is thought to be healthy,” he added.

“These findings are exciting because they suggest that a patient’s microbial signature might be used clinically to predict response to the low FODMAP diet,” said Dr. Roper. “The surprising aspect of these results is that the microbial signature alone was able to predict response to a low FODMAP diet, despite the complex effects of the diet on host physiology and metabolism and the multifactorial etiology of IBS,” he noted. 

However, larger clinical studies are needed to confirm the study findings results in larger patient cohorts and to show that standardized clinical assays can be used to prospectively predict response to dietary interventions such as low FODMAP in IBS, Dr. Roper emphasized.

“This paper provides preliminary and provocative findings that suggest that gut microbiota metabolites may play a role in the pathogenesis of IBS,” said Dr. Roper. “Future basic science and translational research is needed to study the mechanisms by which specific bacterial metabolites regulate intestinal function and disorders such as IBS. I hope that this research will eventually lead to metabolite-based therapies for IBS and other gastrointestinal disorders,” he said.

The study received no outside funding. Lead author Dr. Vervier had no financial conflicts to disclose. Dr. Gibson disclosed authoring two educational/recipe books on the low FODMAP diet, and Monash University financially benefits from the sales of a digital application, booklets, and online courses on the low FODMAP diet. Dr. Halmos had no financial conflicts to disclose. Dr. Roper had no financial conflicts to disclose.

Two distinct gut microbiota subtypes showed an enhanced clinical response to a low FODMAP diet in an analysis of 41 adults with irritable bowel syndrome and household controls.

Irritable bowel syndrome (IBS) has a significant impact on quality of life, and some patients find relief on a low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides and polyols) diet, wrote Kevin Vervier, PhD, of Wellcome Sanger Institute, Hinxton, England, and colleagues. However, the mechanism of action for the success of low FODMAP diets remains unclear, the diet is hard for many patients to follow, and the long-term impact on health is unknown. Therefore, research is needed to identify patients who would derive the most benefit, they said.

In a study published in Gut, the researchers used metagenomics and functional analysis to identify potential biomarkers of response to a low FODMAP diet. They analyzed stool samples from 41 pairs of IBS patients and household contacts. Stool samples were collected at baseline while on usual diets, and again after 4 weeks and 12 weeks on a low FODMAP diet. The patients were divided into two groups based on microbiota clusters; baseline demographics and clinical characteristics were similar between the clusters. In addition, symptom severity was measured using the IBS Severity Scoring System (IBS-SSS).

Cluster 1 was referred to as IBS^P microbiome type because of its pathogenic properties, and cluster 2 as IBS^H microbiome type because of its resemblance to the microbiome of healthy household controls, the researchers wrote.

“We found a significant enrichment of 109 functional pathways and significant depletion of 13 functional pathways in IBS^P microbiomes compared with IBS^H microbiomes,” the researchers said.

More specifically, the IBS^P microbiomes were enriched in Firmicutes and in genes for amino acid and carbohydrate metabolism, at baseline, while the IBS^H microbiomes were similar to healthy controls.

After 4 weeks on the low FODMAP diet, the IBS^P microbiomes normalized, with increased levels of Bacterioides and decreased levels of pathobionts (including Clostridium difficile, Streptococcus parasanguinis, and Paeniclostridium sordellii) to create a microbiome profile resembling the IBSH microbiomes and healthy controls. The taxonomic profile of microbiomes observed in IBS^H and healthy controls did not demonstrate a significant shift.

Although both microbiome groups showed improvement in IBS-SSS scores from baseline on the low FODMAP diet, decreasing from a mean baseline score of 278 to a diet score of 128, the improvement was greater in the IBS^P group than the IBS^H group (delta, 194 vs. 114, respectively; P = .02), the researchers noted. “The shift in the IBS^P microbiota to a healthy profile appeared stable for at least 3 months and correlated with continuing symptomatic well-being,” they wrote.

The distinct responses of the IBS^P and IBS^H microbiomes to the low FODMAP diet suggest a potential mode of action, the researchers said in their discussion. Based on their findings, “it is possible that removal of the eliciting dietary component starves the pathobionts, leading to reduction in their growth and metabolism and a consequent decrease in symptoms, accompanied by an expansion of commensal or symbiotic species leading to a health-associated microbiome,” but more research is needed to prove causality, they said.

The study findings were limited by several factors, including the relatively small sample size, strict inclusion criteria, restriction of medications, and need for participation by household controls, the researchers noted. Other limitations include the inability to control for other factors that could have impacted the gut microbiota, such as the placebo effect and psychological factors, they said.

However, the findings provide a foundation for more research and should be validated in other populations involving different geographical regions and dietary habits, they said. “The identification of a microbial signature ‘biomarker’ that correlates with improved response to a low FODMAP diet may, if validated, allow better stratification and selection of patients likely to benefit from the diet,” they concluded.
 

Setting the stage for focused studies

The low FODMAP diet has demonstrated effectiveness for symptom relief in IBS, although potential risks include exacerbation of disordered eating, nutrition deficiencies, and disrupting gut microbiota, wrote Peter R. Gibson, MD, and Emma P. Halmos, MD, of Monash University and Alfred Health, Melbourne, in an accompanying editorial. However, the current study takes a new step on the journey to identifying patients most likely to respond to a low FODMAP diet, they said.

The editorialists noted three key takeaway points. First, the fecal microbiome may predict response to a low FODMAP diet. Second, the correction of the microbiome through the low FODMAP diet appeared to continue even after the diet was discontinued. “The other intriguing finding was that trehalose metabolic pathways were ‘activated’ in those with dysbiosis,” suggesting that trehalose might be an unrecognized FODMAP, the researchers noted. Trehalose has not been well studied but has been associated with pathogenicity, they said.

Although the study may overemphasize the impact of the low FODMAP diet given the relatively poor assessment of FODMAP intake, “the beauty of Vervier’s work is not in its definitive nature but in that it enables the creation of feasible innovative hypotheses that can be examined by focused studies,” they concluded.

The current study is important because IBS and related disorders of gut-brain interaction are common and greatly impact the quality of life of affected individuals, Jatin Roper, MD, of Duke University in Durham, N.C., said in an interview. Although the mechanisms for improvement are unknown, he said, “The low FODMAP diet is widely used to treat IBS, based on the hypothesis that this diet modifies the gut microbiome in a beneficial way.”

The study authors made two important discoveries, said Dr. Roper. “First, they found that they were able to distinguish IBS versus household controls based on their gut microbial signatures as well expression of key metabolic genes,” he said. “Second, they identified a unique microbiota subtype that was associated with a significant clinical response to the low FODMAP diet in IBS patients; IBS patients with a ‘pathogenic’ microbiome consisting of high Firmicutes and low Bacteroidetes responded to a greater degree to the low FODMAP diet compared to IBS patients with a ‘healthy’ microbiome that was similar to controls,” he explained. “Furthermore, after time on the low FODMAP diet, the IBS patients with pathogenic microbiome signatures developed a microbiome with low Firmicutes and high Bacteroidetes, which is thought to be healthy,” he added.

“These findings are exciting because they suggest that a patient’s microbial signature might be used clinically to predict response to the low FODMAP diet,” said Dr. Roper. “The surprising aspect of these results is that the microbial signature alone was able to predict response to a low FODMAP diet, despite the complex effects of the diet on host physiology and metabolism and the multifactorial etiology of IBS,” he noted. 

However, larger clinical studies are needed to confirm the study findings results in larger patient cohorts and to show that standardized clinical assays can be used to prospectively predict response to dietary interventions such as low FODMAP in IBS, Dr. Roper emphasized.

“This paper provides preliminary and provocative findings that suggest that gut microbiota metabolites may play a role in the pathogenesis of IBS,” said Dr. Roper. “Future basic science and translational research is needed to study the mechanisms by which specific bacterial metabolites regulate intestinal function and disorders such as IBS. I hope that this research will eventually lead to metabolite-based therapies for IBS and other gastrointestinal disorders,” he said.

The study received no outside funding. Lead author Dr. Vervier had no financial conflicts to disclose. Dr. Gibson disclosed authoring two educational/recipe books on the low FODMAP diet, and Monash University financially benefits from the sales of a digital application, booklets, and online courses on the low FODMAP diet. Dr. Halmos had no financial conflicts to disclose. Dr. Roper had no financial conflicts to disclose.

Two distinct gut microbiota subtypes showed an enhanced clinical response to a low FODMAP diet in an analysis of 41 adults with irritable bowel syndrome and household controls.

Irritable bowel syndrome (IBS) has a significant impact on quality of life, and some patients find relief on a low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides and polyols) diet, wrote Kevin Vervier, PhD, of Wellcome Sanger Institute, Hinxton, England, and colleagues. However, the mechanism of action for the success of low FODMAP diets remains unclear, the diet is hard for many patients to follow, and the long-term impact on health is unknown. Therefore, research is needed to identify patients who would derive the most benefit, they said.

In a study published in Gut, the researchers used metagenomics and functional analysis to identify potential biomarkers of response to a low FODMAP diet. They analyzed stool samples from 41 pairs of IBS patients and household contacts. Stool samples were collected at baseline while on usual diets, and again after 4 weeks and 12 weeks on a low FODMAP diet. The patients were divided into two groups based on microbiota clusters; baseline demographics and clinical characteristics were similar between the clusters. In addition, symptom severity was measured using the IBS Severity Scoring System (IBS-SSS).

Cluster 1 was referred to as IBS^P microbiome type because of its pathogenic properties, and cluster 2 as IBS^H microbiome type because of its resemblance to the microbiome of healthy household controls, the researchers wrote.

“We found a significant enrichment of 109 functional pathways and significant depletion of 13 functional pathways in IBS^P microbiomes compared with IBS^H microbiomes,” the researchers said.

More specifically, the IBS^P microbiomes were enriched in Firmicutes and in genes for amino acid and carbohydrate metabolism, at baseline, while the IBS^H microbiomes were similar to healthy controls.

After 4 weeks on the low FODMAP diet, the IBS^P microbiomes normalized, with increased levels of Bacterioides and decreased levels of pathobionts (including Clostridium difficile, Streptococcus parasanguinis, and Paeniclostridium sordellii) to create a microbiome profile resembling the IBSH microbiomes and healthy controls. The taxonomic profile of microbiomes observed in IBS^H and healthy controls did not demonstrate a significant shift.

Although both microbiome groups showed improvement in IBS-SSS scores from baseline on the low FODMAP diet, decreasing from a mean baseline score of 278 to a diet score of 128, the improvement was greater in the IBS^P group than the IBS^H group (delta, 194 vs. 114, respectively; P = .02), the researchers noted. “The shift in the IBS^P microbiota to a healthy profile appeared stable for at least 3 months and correlated with continuing symptomatic well-being,” they wrote.

The distinct responses of the IBS^P and IBS^H microbiomes to the low FODMAP diet suggest a potential mode of action, the researchers said in their discussion. Based on their findings, “it is possible that removal of the eliciting dietary component starves the pathobionts, leading to reduction in their growth and metabolism and a consequent decrease in symptoms, accompanied by an expansion of commensal or symbiotic species leading to a health-associated microbiome,” but more research is needed to prove causality, they said.

The study findings were limited by several factors, including the relatively small sample size, strict inclusion criteria, restriction of medications, and need for participation by household controls, the researchers noted. Other limitations include the inability to control for other factors that could have impacted the gut microbiota, such as the placebo effect and psychological factors, they said.

However, the findings provide a foundation for more research and should be validated in other populations involving different geographical regions and dietary habits, they said. “The identification of a microbial signature ‘biomarker’ that correlates with improved response to a low FODMAP diet may, if validated, allow better stratification and selection of patients likely to benefit from the diet,” they concluded.
 

Setting the stage for focused studies

The low FODMAP diet has demonstrated effectiveness for symptom relief in IBS, although potential risks include exacerbation of disordered eating, nutrition deficiencies, and disrupting gut microbiota, wrote Peter R. Gibson, MD, and Emma P. Halmos, MD, of Monash University and Alfred Health, Melbourne, in an accompanying editorial. However, the current study takes a new step on the journey to identifying patients most likely to respond to a low FODMAP diet, they said.

The editorialists noted three key takeaway points. First, the fecal microbiome may predict response to a low FODMAP diet. Second, the correction of the microbiome through the low FODMAP diet appeared to continue even after the diet was discontinued. “The other intriguing finding was that trehalose metabolic pathways were ‘activated’ in those with dysbiosis,” suggesting that trehalose might be an unrecognized FODMAP, the researchers noted. Trehalose has not been well studied but has been associated with pathogenicity, they said.

Although the study may overemphasize the impact of the low FODMAP diet given the relatively poor assessment of FODMAP intake, “the beauty of Vervier’s work is not in its definitive nature but in that it enables the creation of feasible innovative hypotheses that can be examined by focused studies,” they concluded.

The current study is important because IBS and related disorders of gut-brain interaction are common and greatly impact the quality of life of affected individuals, Jatin Roper, MD, of Duke University in Durham, N.C., said in an interview. Although the mechanisms for improvement are unknown, he said, “The low FODMAP diet is widely used to treat IBS, based on the hypothesis that this diet modifies the gut microbiome in a beneficial way.”

The study authors made two important discoveries, said Dr. Roper. “First, they found that they were able to distinguish IBS versus household controls based on their gut microbial signatures as well expression of key metabolic genes,” he said. “Second, they identified a unique microbiota subtype that was associated with a significant clinical response to the low FODMAP diet in IBS patients; IBS patients with a ‘pathogenic’ microbiome consisting of high Firmicutes and low Bacteroidetes responded to a greater degree to the low FODMAP diet compared to IBS patients with a ‘healthy’ microbiome that was similar to controls,” he explained. “Furthermore, after time on the low FODMAP diet, the IBS patients with pathogenic microbiome signatures developed a microbiome with low Firmicutes and high Bacteroidetes, which is thought to be healthy,” he added.

“These findings are exciting because they suggest that a patient’s microbial signature might be used clinically to predict response to the low FODMAP diet,” said Dr. Roper. “The surprising aspect of these results is that the microbial signature alone was able to predict response to a low FODMAP diet, despite the complex effects of the diet on host physiology and metabolism and the multifactorial etiology of IBS,” he noted. 

However, larger clinical studies are needed to confirm the study findings results in larger patient cohorts and to show that standardized clinical assays can be used to prospectively predict response to dietary interventions such as low FODMAP in IBS, Dr. Roper emphasized.

“This paper provides preliminary and provocative findings that suggest that gut microbiota metabolites may play a role in the pathogenesis of IBS,” said Dr. Roper. “Future basic science and translational research is needed to study the mechanisms by which specific bacterial metabolites regulate intestinal function and disorders such as IBS. I hope that this research will eventually lead to metabolite-based therapies for IBS and other gastrointestinal disorders,” he said.

The study received no outside funding. Lead author Dr. Vervier had no financial conflicts to disclose. Dr. Gibson disclosed authoring two educational/recipe books on the low FODMAP diet, and Monash University financially benefits from the sales of a digital application, booklets, and online courses on the low FODMAP diet. Dr. Halmos had no financial conflicts to disclose. Dr. Roper had no financial conflicts to disclose.

The proportion of U.S. children who are underinsured for health care increased by 3.4% from 2016 to 2019, reflecting approximately 2.4 million underinsured children, based on data from the National Survey of Children’s Health.

Children with inconsistent or inadequate medical coverage are more likely to forgo medical care, including preventive well-child visits, and to have unmet medical needs such as prescription medications, Justin Yu, MD, of the Children’s Hospital of Pittsburgh, and colleagues wrote. Although the American Academy of Pediatrics and the Healthy People 2030 guidelines have endorsed increasing the proportion of children with adequate coverage, recent studies suggest that advances in insuring children in the wake of the Affordable Care Act have stalled, and trends in child insurance have not been well described, the researchers said.

In a study published in Pediatrics, the researchers reviewed data from the combined 2016-2019 datasets of the National Survey of Children’s Health, a survey funded by the Maternal and Child Health Bureau of the Health Resources and Services Administration.

Adequate insurance was defined as a composite with three questions; whether the benefits “usually” or “always” meet the child’s needs; the benefits “usually” or “always” allow the child to see needed providers; and whether out-of-pocket expenses are either absent or “usually” or “always” reasonable.

Overall, the proportion of children with underinsurance increased from 30.6% in 2016 to 34.0% in 2019.

Underinsurance was significantly associated with increased health complexity and private insurance, with adjusted odds ratios of 1.9 and 3.5, respectively. In addition, underinsurance was significantly associated with child age of 6 years or older, non-Black racial identity, U.S. nonnative status, and a family income of at least 100% above the Federal Poverty Level. Notably, underinsurance grew significantly among White children living in “middle-income” families, the researchers said.

The increase in underinsurance was driven primarily by increased insurance inadequacy, which rose from 24.8% to 27.9% over the study period. The increase in insurance inadequacy was described primarily as unreasonable out-of-pocket medical expenses, according to the survey respondents.

The study findings were limited by several factors including the inability to show causality or to describe changes in outcomes for individual children, the researchers noted. Other limitations include the reliance on parent reports and the lack of a definitive definition of underinsurance.

However, the results highlight the ongoing problem of underinsurance in children, and the need to address the factors that contribute to inadequate insurance for children, the researchers said.

“Our data, demonstrating a shift from public to private insurance that is more likely to be inadequate, in conjunction with existing literature linking Medicaid/CHIP [Children’s Health Insurance Program] coverage with improved access to medical care as well as improved long-term outcomes in adulthood, should give policy makers and payers pause as they contemplate strategies to improve child health,” they concluded.

Nationwide action needed to fight underinsurance

The authors should be commended for highlighting the disturbing trend in underinsurance among children in the United States, Tim Joos, MD, a Seattle-based clinician with a combination internal medicine/pediatrics practice, said in an interview.

“With the passage of the Affordable Care Act, the population of uninsured and underinsured had shrunk quite a bit, but in the past few years, the numbers are growing again. This population has often been called the working poor; the vast majority are legal residents who make too much to qualify for Medicaid/CHIP programs, and whose employers don’t offer affordable robust health care coverage,” Dr. Joos said.

“These families have to make the risky decisions of how much of the family budget to spend on insurance plans, often to the detriment of their own and their children’s health,” he explained. “If you believe the old adage about ‘an ounce of prevention,’ then the money we spend on preserving the health of our children will more than pay for itself in benefits of increased productivity and health care savings in the 1-2 decades later when they reach adulthood. It is time for us as a nation to come up with a more comprehensive baseline coverage for all pediatric patients and take away any barriers for families to access basic health care for children.”

The study received no outside funding. The researchers had no financial conflicts to disclose. Dr. Joos had no financial conflicts to disclose and serves on the editorial advisory board of Pediatric News.

The proportion of U.S. children who are underinsured for health care increased by 3.4% from 2016 to 2019, reflecting approximately 2.4 million underinsured children, based on data from the National Survey of Children’s Health.

Children with inconsistent or inadequate medical coverage are more likely to forgo medical care, including preventive well-child visits, and to have unmet medical needs such as prescription medications, Justin Yu, MD, of the Children’s Hospital of Pittsburgh, and colleagues wrote. Although the American Academy of Pediatrics and the Healthy People 2030 guidelines have endorsed increasing the proportion of children with adequate coverage, recent studies suggest that advances in insuring children in the wake of the Affordable Care Act have stalled, and trends in child insurance have not been well described, the researchers said.

In a study published in Pediatrics, the researchers reviewed data from the combined 2016-2019 datasets of the National Survey of Children’s Health, a survey funded by the Maternal and Child Health Bureau of the Health Resources and Services Administration.

Adequate insurance was defined as a composite with three questions; whether the benefits “usually” or “always” meet the child’s needs; the benefits “usually” or “always” allow the child to see needed providers; and whether out-of-pocket expenses are either absent or “usually” or “always” reasonable.

Overall, the proportion of children with underinsurance increased from 30.6% in 2016 to 34.0% in 2019.

Underinsurance was significantly associated with increased health complexity and private insurance, with adjusted odds ratios of 1.9 and 3.5, respectively. In addition, underinsurance was significantly associated with child age of 6 years or older, non-Black racial identity, U.S. nonnative status, and a family income of at least 100% above the Federal Poverty Level. Notably, underinsurance grew significantly among White children living in “middle-income” families, the researchers said.

The increase in underinsurance was driven primarily by increased insurance inadequacy, which rose from 24.8% to 27.9% over the study period. The increase in insurance inadequacy was described primarily as unreasonable out-of-pocket medical expenses, according to the survey respondents.

The study findings were limited by several factors including the inability to show causality or to describe changes in outcomes for individual children, the researchers noted. Other limitations include the reliance on parent reports and the lack of a definitive definition of underinsurance.

However, the results highlight the ongoing problem of underinsurance in children, and the need to address the factors that contribute to inadequate insurance for children, the researchers said.

“Our data, demonstrating a shift from public to private insurance that is more likely to be inadequate, in conjunction with existing literature linking Medicaid/CHIP [Children’s Health Insurance Program] coverage with improved access to medical care as well as improved long-term outcomes in adulthood, should give policy makers and payers pause as they contemplate strategies to improve child health,” they concluded.

Nationwide action needed to fight underinsurance

The authors should be commended for highlighting the disturbing trend in underinsurance among children in the United States, Tim Joos, MD, a Seattle-based clinician with a combination internal medicine/pediatrics practice, said in an interview.

“With the passage of the Affordable Care Act, the population of uninsured and underinsured had shrunk quite a bit, but in the past few years, the numbers are growing again. This population has often been called the working poor; the vast majority are legal residents who make too much to qualify for Medicaid/CHIP programs, and whose employers don’t offer affordable robust health care coverage,” Dr. Joos said.

“These families have to make the risky decisions of how much of the family budget to spend on insurance plans, often to the detriment of their own and their children’s health,” he explained. “If you believe the old adage about ‘an ounce of prevention,’ then the money we spend on preserving the health of our children will more than pay for itself in benefits of increased productivity and health care savings in the 1-2 decades later when they reach adulthood. It is time for us as a nation to come up with a more comprehensive baseline coverage for all pediatric patients and take away any barriers for families to access basic health care for children.”

The study received no outside funding. The researchers had no financial conflicts to disclose. Dr. Joos had no financial conflicts to disclose and serves on the editorial advisory board of Pediatric News.

The proportion of U.S. children who are underinsured for health care increased by 3.4% from 2016 to 2019, reflecting approximately 2.4 million underinsured children, based on data from the National Survey of Children’s Health.

Children with inconsistent or inadequate medical coverage are more likely to forgo medical care, including preventive well-child visits, and to have unmet medical needs such as prescription medications, Justin Yu, MD, of the Children’s Hospital of Pittsburgh, and colleagues wrote. Although the American Academy of Pediatrics and the Healthy People 2030 guidelines have endorsed increasing the proportion of children with adequate coverage, recent studies suggest that advances in insuring children in the wake of the Affordable Care Act have stalled, and trends in child insurance have not been well described, the researchers said.

In a study published in Pediatrics, the researchers reviewed data from the combined 2016-2019 datasets of the National Survey of Children’s Health, a survey funded by the Maternal and Child Health Bureau of the Health Resources and Services Administration.

Adequate insurance was defined as a composite with three questions; whether the benefits “usually” or “always” meet the child’s needs; the benefits “usually” or “always” allow the child to see needed providers; and whether out-of-pocket expenses are either absent or “usually” or “always” reasonable.

Overall, the proportion of children with underinsurance increased from 30.6% in 2016 to 34.0% in 2019.

Underinsurance was significantly associated with increased health complexity and private insurance, with adjusted odds ratios of 1.9 and 3.5, respectively. In addition, underinsurance was significantly associated with child age of 6 years or older, non-Black racial identity, U.S. nonnative status, and a family income of at least 100% above the Federal Poverty Level. Notably, underinsurance grew significantly among White children living in “middle-income” families, the researchers said.

The increase in underinsurance was driven primarily by increased insurance inadequacy, which rose from 24.8% to 27.9% over the study period. The increase in insurance inadequacy was described primarily as unreasonable out-of-pocket medical expenses, according to the survey respondents.

The study findings were limited by several factors including the inability to show causality or to describe changes in outcomes for individual children, the researchers noted. Other limitations include the reliance on parent reports and the lack of a definitive definition of underinsurance.

However, the results highlight the ongoing problem of underinsurance in children, and the need to address the factors that contribute to inadequate insurance for children, the researchers said.

“Our data, demonstrating a shift from public to private insurance that is more likely to be inadequate, in conjunction with existing literature linking Medicaid/CHIP [Children’s Health Insurance Program] coverage with improved access to medical care as well as improved long-term outcomes in adulthood, should give policy makers and payers pause as they contemplate strategies to improve child health,” they concluded.

Nationwide action needed to fight underinsurance

The authors should be commended for highlighting the disturbing trend in underinsurance among children in the United States, Tim Joos, MD, a Seattle-based clinician with a combination internal medicine/pediatrics practice, said in an interview.

“With the passage of the Affordable Care Act, the population of uninsured and underinsured had shrunk quite a bit, but in the past few years, the numbers are growing again. This population has often been called the working poor; the vast majority are legal residents who make too much to qualify for Medicaid/CHIP programs, and whose employers don’t offer affordable robust health care coverage,” Dr. Joos said.

“These families have to make the risky decisions of how much of the family budget to spend on insurance plans, often to the detriment of their own and their children’s health,” he explained. “If you believe the old adage about ‘an ounce of prevention,’ then the money we spend on preserving the health of our children will more than pay for itself in benefits of increased productivity and health care savings in the 1-2 decades later when they reach adulthood. It is time for us as a nation to come up with a more comprehensive baseline coverage for all pediatric patients and take away any barriers for families to access basic health care for children.”

The study received no outside funding. The researchers had no financial conflicts to disclose. Dr. Joos had no financial conflicts to disclose and serves on the editorial advisory board of Pediatric News.

Pinker or redder actinic keratoses (AKs) indicate greater inflammation, according to a retrospective study that analyzed images and histopathology slides of 49 actinic keratosis lesions.

Data suggest that up to 65% of squamous cell carcinomas (SCCs) were at some point diagnosed as AKs, wrote Jessica G. Labadie, MD, of the department of dermatology at Northwestern University, Chicago, and colleagues. Early identification of AKs is important to prevent progression to SCCs; previous studies have used histology or morphology, but not color, to characterize AK lesions, they said. In the study published in Dermatologic Surgery, the researchers analyzed images and histopathology slides to characterize AKs by color and to examine associations with inflammation and vasculature. They identified AKs from patients diagnosed between January 2018 and October 2019. The lesions were classified as white (4), brown (9), red (15), or pink (21).

Overall, white AKs had an absence of erythema and were significantly less likely to show inflammation on histopathology, compared with other colors. Brown AKs showed no significant increase in vascularity, but were significantly associated with pigment incontinence, basilar pigment presence, and absence of inflammation.

Notably, dermoscopy of red AKs revealed a distinctive polymorphous vessel pattern in most samples, as well as erythema in all. Similarly, all pink AKs showed erythema, and all showed inflammatory infiltrate on histology, although most did not show increased vascularity.

For all colors of AKs, there was a significant association between the presence of erythema on dermoscopy and the presence of inflammation on histology, while the absence of erythema on dermoscopy corresponded to a significant absence of inflammation on histology, the researchers noted.

“This report adds to the armamentarium of a dermatologist by proposing a novel way to characterize AK lesions,” the researchers wrote.

The study findings were limited by several factors including the inability to confirm which AKs would transform into SCCs based on color, and the inclusion of a study population with advanced AKs that may not generalize to typical AKs, the researchers noted. More research is needed to explore the impact of AK color on SCC development, they emphasized.

However, the results represent a novel way to characterize AK lesions, and triage them in a way that may spare some patients from unneeded biopsies, they concluded.

The study received no outside funding. The researchers had no financial conflicts to disclose.

Pinker or redder actinic keratoses (AKs) indicate greater inflammation, according to a retrospective study that analyzed images and histopathology slides of 49 actinic keratosis lesions.

Data suggest that up to 65% of squamous cell carcinomas (SCCs) were at some point diagnosed as AKs, wrote Jessica G. Labadie, MD, of the department of dermatology at Northwestern University, Chicago, and colleagues. Early identification of AKs is important to prevent progression to SCCs; previous studies have used histology or morphology, but not color, to characterize AK lesions, they said. In the study published in Dermatologic Surgery, the researchers analyzed images and histopathology slides to characterize AKs by color and to examine associations with inflammation and vasculature. They identified AKs from patients diagnosed between January 2018 and October 2019. The lesions were classified as white (4), brown (9), red (15), or pink (21).

Overall, white AKs had an absence of erythema and were significantly less likely to show inflammation on histopathology, compared with other colors. Brown AKs showed no significant increase in vascularity, but were significantly associated with pigment incontinence, basilar pigment presence, and absence of inflammation.

Notably, dermoscopy of red AKs revealed a distinctive polymorphous vessel pattern in most samples, as well as erythema in all. Similarly, all pink AKs showed erythema, and all showed inflammatory infiltrate on histology, although most did not show increased vascularity.

For all colors of AKs, there was a significant association between the presence of erythema on dermoscopy and the presence of inflammation on histology, while the absence of erythema on dermoscopy corresponded to a significant absence of inflammation on histology, the researchers noted.

“This report adds to the armamentarium of a dermatologist by proposing a novel way to characterize AK lesions,” the researchers wrote.

The study findings were limited by several factors including the inability to confirm which AKs would transform into SCCs based on color, and the inclusion of a study population with advanced AKs that may not generalize to typical AKs, the researchers noted. More research is needed to explore the impact of AK color on SCC development, they emphasized.

However, the results represent a novel way to characterize AK lesions, and triage them in a way that may spare some patients from unneeded biopsies, they concluded.

The study received no outside funding. The researchers had no financial conflicts to disclose.

Pinker or redder actinic keratoses (AKs) indicate greater inflammation, according to a retrospective study that analyzed images and histopathology slides of 49 actinic keratosis lesions.

Data suggest that up to 65% of squamous cell carcinomas (SCCs) were at some point diagnosed as AKs, wrote Jessica G. Labadie, MD, of the department of dermatology at Northwestern University, Chicago, and colleagues. Early identification of AKs is important to prevent progression to SCCs; previous studies have used histology or morphology, but not color, to characterize AK lesions, they said. In the study published in Dermatologic Surgery, the researchers analyzed images and histopathology slides to characterize AKs by color and to examine associations with inflammation and vasculature. They identified AKs from patients diagnosed between January 2018 and October 2019. The lesions were classified as white (4), brown (9), red (15), or pink (21).

Overall, white AKs had an absence of erythema and were significantly less likely to show inflammation on histopathology, compared with other colors. Brown AKs showed no significant increase in vascularity, but were significantly associated with pigment incontinence, basilar pigment presence, and absence of inflammation.

Notably, dermoscopy of red AKs revealed a distinctive polymorphous vessel pattern in most samples, as well as erythema in all. Similarly, all pink AKs showed erythema, and all showed inflammatory infiltrate on histology, although most did not show increased vascularity.

For all colors of AKs, there was a significant association between the presence of erythema on dermoscopy and the presence of inflammation on histology, while the absence of erythema on dermoscopy corresponded to a significant absence of inflammation on histology, the researchers noted.

“This report adds to the armamentarium of a dermatologist by proposing a novel way to characterize AK lesions,” the researchers wrote.

The study findings were limited by several factors including the inability to confirm which AKs would transform into SCCs based on color, and the inclusion of a study population with advanced AKs that may not generalize to typical AKs, the researchers noted. More research is needed to explore the impact of AK color on SCC development, they emphasized.

However, the results represent a novel way to characterize AK lesions, and triage them in a way that may spare some patients from unneeded biopsies, they concluded.

The study received no outside funding. The researchers had no financial conflicts to disclose.

Peripheral manifestations contribute significantly to disease activity in adults with spondyloarthritis (SpA), point toward a generally worse prognosis, and play a big role in defining the phenotypic clustering of the heterogenous disease, according to findings from what researchers called the first prospective study “to comprehensively describe the prevalence, clinical patterns, and prognostic implications of peripheral manifestations across the entire SpA spectrum.”

The stratification of patients in the study based on the presence of peripheral manifestations (arthritis, enthesitis, and/or dactylitis) led to the identification of an endotype with unfavorable outcomes, which not only has prognostic value but supports the need for an endotype-based treatment approach rather than one centered on C-reactive protein (CRP) and the Ankylosing Spondylitis Disease Activity Score (ASDAS).

The findings “advocate strongly for the presence of a distinct SpA endotype, based on potentially different immunopathological mechanisms and characterized by high disease activity at initial presentation with lack of substantial improvement upon follow-up,” first author Ann-Sophie De Craemer, MD, of Ghent, Belgium, and colleagues wrote.

Because the diagnostic and prognostic value of peripheral manifestations has not been well studied in SpA in general and in newly diagnosed patients in particular, Dr. De Craemer and associates decided to analyze their impact in 367 patients in the Be-Giant (BelGian Inflammatory Arthritis and spoNdylitis cohorT) cohort, a multicenter, prospective, observational cohort of newly diagnosed patients with SpA in Belgium. The study was published in Rheumatology.

The study population included 257 (70%) patients with axial-predominant SpA (axSpA) as classified by Assessment of Spondyloarthritis International Society criteria and 110 (30%) with peripheral-predominant SpA (pSpA) as defined by ASAS criteria. A total of 52 patients with axSpA had peripheral manifestations at baseline. The mean age of the patients was 34 years, and 52% were male.

The 162 patients with peripheral manifestations included 143 with arthritis, 52 with enthesitis, and 55 with dactylitis.

Two patient clusters emerge from data

In a cluster analysis that used baseline clinical features, the researchers divided the patients into cluster A (of which 242 of 248 were patients with axSpA) and cluster B (of which 104 of 119 were patients with pSpA). Most of the patients with peripheral manifestations were in cluster B (117 of 162 [72%]), compared with cluster A (45 of 162 [28%]).

A longitudinal analysis included 195 patients who completed a minimum 2-year follow-up. The longitudinal analysis identified high- and low-disease activity trajectories in each cluster.

In axSpA-predominant cluster A, patients with “high” trajectory had high disease activity levels at baseline (mean ASDAS-CRP, 3.2) that remained relatively stable, while those in the low-trajectory group (62%) had less disease activity at baseline (mean ASDAS-CRP, 2.0), which then further declined during follow-up.

Patients in the high trajectory in cluster A were more often affected by peripheral manifestations, “which remained a significant predictor in multivariate analysis,” with an odds ratio of 2.4, the researchers noted. In addition, patients with peripheral manifestations were significantly more likely to have persistent high disease activity despite starting biologics earlier than patients without peripheral manifestations (hazard ratio, 2.1).

Patients in pSpA-predominant cluster B showed differences that were similar to those seen in cluster A in terms of high– and low–disease activity trajectories (mean ASDAS-CRP of 3.6 and 2.8, respectively), but among these patients, a high level of disease activity was significantly associated with elevated CRP, rather than with peripheral disease, the researchers said.

The study findings were limited by several factors, including the exclusion of patients who did not complete the follow-up, which reduced the sample size for longitudinal analysis. However, the results were strengthened by the inclusion of patients from the full SpA spectrum, a geographically spread-out patient population, and a study design that mirrored clinical practice, the researchers noted.

The Be-Giant cohort was supported by an unrestricted grant from AbbVie. Several authors reported financial relationships with AbbVie and other pharmaceutical companies.

Peripheral manifestations contribute significantly to disease activity in adults with spondyloarthritis (SpA), point toward a generally worse prognosis, and play a big role in defining the phenotypic clustering of the heterogenous disease, according to findings from what researchers called the first prospective study “to comprehensively describe the prevalence, clinical patterns, and prognostic implications of peripheral manifestations across the entire SpA spectrum.”

The stratification of patients in the study based on the presence of peripheral manifestations (arthritis, enthesitis, and/or dactylitis) led to the identification of an endotype with unfavorable outcomes, which not only has prognostic value but supports the need for an endotype-based treatment approach rather than one centered on C-reactive protein (CRP) and the Ankylosing Spondylitis Disease Activity Score (ASDAS).

The findings “advocate strongly for the presence of a distinct SpA endotype, based on potentially different immunopathological mechanisms and characterized by high disease activity at initial presentation with lack of substantial improvement upon follow-up,” first author Ann-Sophie De Craemer, MD, of Ghent, Belgium, and colleagues wrote.

Because the diagnostic and prognostic value of peripheral manifestations has not been well studied in SpA in general and in newly diagnosed patients in particular, Dr. De Craemer and associates decided to analyze their impact in 367 patients in the Be-Giant (BelGian Inflammatory Arthritis and spoNdylitis cohorT) cohort, a multicenter, prospective, observational cohort of newly diagnosed patients with SpA in Belgium. The study was published in Rheumatology.

The study population included 257 (70%) patients with axial-predominant SpA (axSpA) as classified by Assessment of Spondyloarthritis International Society criteria and 110 (30%) with peripheral-predominant SpA (pSpA) as defined by ASAS criteria. A total of 52 patients with axSpA had peripheral manifestations at baseline. The mean age of the patients was 34 years, and 52% were male.

The 162 patients with peripheral manifestations included 143 with arthritis, 52 with enthesitis, and 55 with dactylitis.

Two patient clusters emerge from data

In a cluster analysis that used baseline clinical features, the researchers divided the patients into cluster A (of which 242 of 248 were patients with axSpA) and cluster B (of which 104 of 119 were patients with pSpA). Most of the patients with peripheral manifestations were in cluster B (117 of 162 [72%]), compared with cluster A (45 of 162 [28%]).

A longitudinal analysis included 195 patients who completed a minimum 2-year follow-up. The longitudinal analysis identified high- and low-disease activity trajectories in each cluster.

In axSpA-predominant cluster A, patients with “high” trajectory had high disease activity levels at baseline (mean ASDAS-CRP, 3.2) that remained relatively stable, while those in the low-trajectory group (62%) had less disease activity at baseline (mean ASDAS-CRP, 2.0), which then further declined during follow-up.

Patients in the high trajectory in cluster A were more often affected by peripheral manifestations, “which remained a significant predictor in multivariate analysis,” with an odds ratio of 2.4, the researchers noted. In addition, patients with peripheral manifestations were significantly more likely to have persistent high disease activity despite starting biologics earlier than patients without peripheral manifestations (hazard ratio, 2.1).

Patients in pSpA-predominant cluster B showed differences that were similar to those seen in cluster A in terms of high– and low–disease activity trajectories (mean ASDAS-CRP of 3.6 and 2.8, respectively), but among these patients, a high level of disease activity was significantly associated with elevated CRP, rather than with peripheral disease, the researchers said.

The study findings were limited by several factors, including the exclusion of patients who did not complete the follow-up, which reduced the sample size for longitudinal analysis. However, the results were strengthened by the inclusion of patients from the full SpA spectrum, a geographically spread-out patient population, and a study design that mirrored clinical practice, the researchers noted.

The Be-Giant cohort was supported by an unrestricted grant from AbbVie. Several authors reported financial relationships with AbbVie and other pharmaceutical companies.

Peripheral manifestations contribute significantly to disease activity in adults with spondyloarthritis (SpA), point toward a generally worse prognosis, and play a big role in defining the phenotypic clustering of the heterogenous disease, according to findings from what researchers called the first prospective study “to comprehensively describe the prevalence, clinical patterns, and prognostic implications of peripheral manifestations across the entire SpA spectrum.”

The stratification of patients in the study based on the presence of peripheral manifestations (arthritis, enthesitis, and/or dactylitis) led to the identification of an endotype with unfavorable outcomes, which not only has prognostic value but supports the need for an endotype-based treatment approach rather than one centered on C-reactive protein (CRP) and the Ankylosing Spondylitis Disease Activity Score (ASDAS).

The findings “advocate strongly for the presence of a distinct SpA endotype, based on potentially different immunopathological mechanisms and characterized by high disease activity at initial presentation with lack of substantial improvement upon follow-up,” first author Ann-Sophie De Craemer, MD, of Ghent, Belgium, and colleagues wrote.

Because the diagnostic and prognostic value of peripheral manifestations has not been well studied in SpA in general and in newly diagnosed patients in particular, Dr. De Craemer and associates decided to analyze their impact in 367 patients in the Be-Giant (BelGian Inflammatory Arthritis and spoNdylitis cohorT) cohort, a multicenter, prospective, observational cohort of newly diagnosed patients with SpA in Belgium. The study was published in Rheumatology.

The study population included 257 (70%) patients with axial-predominant SpA (axSpA) as classified by Assessment of Spondyloarthritis International Society criteria and 110 (30%) with peripheral-predominant SpA (pSpA) as defined by ASAS criteria. A total of 52 patients with axSpA had peripheral manifestations at baseline. The mean age of the patients was 34 years, and 52% were male.

The 162 patients with peripheral manifestations included 143 with arthritis, 52 with enthesitis, and 55 with dactylitis.

Two patient clusters emerge from data

In a cluster analysis that used baseline clinical features, the researchers divided the patients into cluster A (of which 242 of 248 were patients with axSpA) and cluster B (of which 104 of 119 were patients with pSpA). Most of the patients with peripheral manifestations were in cluster B (117 of 162 [72%]), compared with cluster A (45 of 162 [28%]).

A longitudinal analysis included 195 patients who completed a minimum 2-year follow-up. The longitudinal analysis identified high- and low-disease activity trajectories in each cluster.

In axSpA-predominant cluster A, patients with “high” trajectory had high disease activity levels at baseline (mean ASDAS-CRP, 3.2) that remained relatively stable, while those in the low-trajectory group (62%) had less disease activity at baseline (mean ASDAS-CRP, 2.0), which then further declined during follow-up.

Patients in the high trajectory in cluster A were more often affected by peripheral manifestations, “which remained a significant predictor in multivariate analysis,” with an odds ratio of 2.4, the researchers noted. In addition, patients with peripheral manifestations were significantly more likely to have persistent high disease activity despite starting biologics earlier than patients without peripheral manifestations (hazard ratio, 2.1).

Patients in pSpA-predominant cluster B showed differences that were similar to those seen in cluster A in terms of high– and low–disease activity trajectories (mean ASDAS-CRP of 3.6 and 2.8, respectively), but among these patients, a high level of disease activity was significantly associated with elevated CRP, rather than with peripheral disease, the researchers said.

The study findings were limited by several factors, including the exclusion of patients who did not complete the follow-up, which reduced the sample size for longitudinal analysis. However, the results were strengthened by the inclusion of patients from the full SpA spectrum, a geographically spread-out patient population, and a study design that mirrored clinical practice, the researchers noted.

The Be-Giant cohort was supported by an unrestricted grant from AbbVie. Several authors reported financial relationships with AbbVie and other pharmaceutical companies.

Children and adolescents with poorly controlled asthma were three to six times more likely to be hospitalized with COVID-19 infections, based on data from a national study of more than 750,000 children in Scotland.

Although the majority of COVID-19 cases in children have been mild, some children require hospitalization, wrote Ting Shi, PhD, of the University of Edinburgh (Scotland) and colleagues.

Vaccination policies to potentially reduce infection and hospitalization of children remain inconsistent, the researchers said. Identifying which school-age children would derive the greatest benefit from vaccination “could help to reduce the risk of infection and consequently the need for children to have time off school; and might also reduce the risk of spread of SARS-CoV-2 within schools and households,” but the potential benefits of vaccination for children with asthma in particular have not been well studied, they wrote.

The United Kingdom’s Joint Commission on Vaccination and Immunisation commissioned research on the rates of hospitalization among children with poorly controlled asthma. In a national incidence cohort study published in The Lancet Respiratory Medicine, the researchers reviewed data from all children aged 5-17 years in Scotland who were enrolled in the linked dataset of Early Pandemic Evaluation and Enhanced Surveillance of COVID-19 (EAVE II). The total number of children in the dataset was 752,867, and 63,463 (8.4%) of these had diagnosed asthma. Among the children with asthma, 4,339 (6.8%) had confirmed COVID-19 infections between March 1, 2020, and July 27, 2021. A total of 67 infected children were hospitalized. Of the 689,404 children without asthma, 40,231 (5.8%) had confirmed COVID-19 infections, and 382 (0.9%) of these children were hospitalized.

Overall, hospital admission rates for COVID-19 were significantly higher among children with asthma, compared to those without asthma (adjusted hazard ratio, 1.49), and the rates increased among children with poorly controlled asthma.

The researchers used previous hospital admission for asthma as a measure of uncontrolled asthma, and found that hospitalization was at least six times as likely for children with poorly controlled asthma, compared with those with no asthma (aHR, 6.40), although children with well-controlled asthma also had an increased risk of hospitalization, compared with those with no asthma (aHR, 1.36).

When the researchers used oral corticosteroid prescriptions as an indicator of uncontrolled asthma, the adjusted hazard ratios were 3.38, 3.53, 1.52, and 1.34 for children with prescribed corticosteroid courses of three or more, two, one, and none, respectively, compared with children with no asthma.

These hazard ratios remained significant after controlling for factors including age, sex, socioeconomic status, comorbidity, and previous hospital admission, the researchers wrote.

In an age-based analysis, results were similar for children aged 12-17 years, but in children aged 5-11 years, the hospitalization risk decreased for those with one course of corticosteroids and reached the highest rate for those with three or more courses, rather than two courses.

The study findings were limited by several factors including the relatively small numbers of COVID-19 hospitalizations, ICU admissions, and deaths in children with asthma, the researchers noted. Other limitations include potential changes in asthma control over the study period, and lack of data on certain confounders such as tobacco use, unsuitable housing, and ethnicity, they noted. However, the results were strengthened by the use of a large, national dataset, and access to electronic health records, they said.

The findings reflect data from previous studies suggesting increased risk of hospitalization for patients with respiratory illness who develop COVID-19 infections, the researchers wrote.

The results emphasize the importance of good asthma control to protect children from severe COVID-19, and careful monitoring of children with poorly controlled asthma who do become infected, they added.

“The findings from this linkage of multiple data sources have helped inform the prioritisation of school-aged children with poorly controlled asthma for vaccines,” they concluded.
 

Findings support value of vaccination for children with asthma

“Pediatricians see many children who suffer from asthma, and although one could assume that these children would have more serious consequences from contracting COVID-19, the current study examines a large database in a way not possible in the United States to address the severity question,” said Suzanne C. Boulter, MD, of the Geisel School of Medicine at Dartmouth, Hanover, N.H. “The authors used prior hospitalization rate or two prescriptions for oral corticosteroids as markers of asthma severity prior to the onset of COVID-19 in Scotland, and they collected retrospective data for 16 months of the pandemic through July of 2021, showing a significant increase in hospitalization for those children,” she said. Dr. Boulter said she was not surprised by this finding, given the impact of COVID-19 on the respiratory system.

“Pediatricians have found significant challenges from some groups of parents when discussing the indications and need for vaccination in their patients,” said Dr. Boulter. “Having this data on the increased risk of morbidity and mortality in children with asthma might help parents who are uncertain about the risk/benefit ratio of the vaccine make their decision,” she said.

Dr. Boulter said she hoped that additional studies will yield ongoing information about hospitalization rates for COVID-19 not only about asthma, but also other diagnoses affecting children in the United States and worldwide.

“It would also be important to see a breakdown of ethnic factors and adverse childhood experiences and how they relate to hospitalization and death from COVID-19,” Dr. Boulter said.

“The results of this study are not surprising, as we have known for a long time that children with severe asthma are more susceptible to severe respiratory viruses,” Francis E. Rushton, MD, a pediatrician in Beaufort, S.C., said in an interview. “But the study is still important, as it helps us determine which children are most urgently in need of protection from COVID-19 in any of its forms,” he emphasized. In particular, the current study underlines the importance of vaccinating children with unstable asthma, Dr. Rushton said.

Going forward, “it would be interesting to do additional studies looking at other markers for poor asthma control that could guide our vaccine efforts so that they are focused on those most at risk,” he added.

The study was supported by the UK Research and Innovation (Medical Research Council), Research and Innovation Industrial Strategy Challenge Fund, Health Data Research UK, and the Scottish Government. Lead author Dr. Shi had no financial conflicts to disclose. Dr. Rushton and Dr. Boulter had no financial conflicts to disclose, but each serves on the Editorial Advisory Board of Pediatric News.

Children and adolescents with poorly controlled asthma were three to six times more likely to be hospitalized with COVID-19 infections, based on data from a national study of more than 750,000 children in Scotland.

Although the majority of COVID-19 cases in children have been mild, some children require hospitalization, wrote Ting Shi, PhD, of the University of Edinburgh (Scotland) and colleagues.

Vaccination policies to potentially reduce infection and hospitalization of children remain inconsistent, the researchers said. Identifying which school-age children would derive the greatest benefit from vaccination “could help to reduce the risk of infection and consequently the need for children to have time off school; and might also reduce the risk of spread of SARS-CoV-2 within schools and households,” but the potential benefits of vaccination for children with asthma in particular have not been well studied, they wrote.

The United Kingdom’s Joint Commission on Vaccination and Immunisation commissioned research on the rates of hospitalization among children with poorly controlled asthma. In a national incidence cohort study published in The Lancet Respiratory Medicine, the researchers reviewed data from all children aged 5-17 years in Scotland who were enrolled in the linked dataset of Early Pandemic Evaluation and Enhanced Surveillance of COVID-19 (EAVE II). The total number of children in the dataset was 752,867, and 63,463 (8.4%) of these had diagnosed asthma. Among the children with asthma, 4,339 (6.8%) had confirmed COVID-19 infections between March 1, 2020, and July 27, 2021. A total of 67 infected children were hospitalized. Of the 689,404 children without asthma, 40,231 (5.8%) had confirmed COVID-19 infections, and 382 (0.9%) of these children were hospitalized.

Overall, hospital admission rates for COVID-19 were significantly higher among children with asthma, compared to those without asthma (adjusted hazard ratio, 1.49), and the rates increased among children with poorly controlled asthma.

The researchers used previous hospital admission for asthma as a measure of uncontrolled asthma, and found that hospitalization was at least six times as likely for children with poorly controlled asthma, compared with those with no asthma (aHR, 6.40), although children with well-controlled asthma also had an increased risk of hospitalization, compared with those with no asthma (aHR, 1.36).

When the researchers used oral corticosteroid prescriptions as an indicator of uncontrolled asthma, the adjusted hazard ratios were 3.38, 3.53, 1.52, and 1.34 for children with prescribed corticosteroid courses of three or more, two, one, and none, respectively, compared with children with no asthma.

These hazard ratios remained significant after controlling for factors including age, sex, socioeconomic status, comorbidity, and previous hospital admission, the researchers wrote.

In an age-based analysis, results were similar for children aged 12-17 years, but in children aged 5-11 years, the hospitalization risk decreased for those with one course of corticosteroids and reached the highest rate for those with three or more courses, rather than two courses.

The study findings were limited by several factors including the relatively small numbers of COVID-19 hospitalizations, ICU admissions, and deaths in children with asthma, the researchers noted. Other limitations include potential changes in asthma control over the study period, and lack of data on certain confounders such as tobacco use, unsuitable housing, and ethnicity, they noted. However, the results were strengthened by the use of a large, national dataset, and access to electronic health records, they said.

The findings reflect data from previous studies suggesting increased risk of hospitalization for patients with respiratory illness who develop COVID-19 infections, the researchers wrote.

The results emphasize the importance of good asthma control to protect children from severe COVID-19, and careful monitoring of children with poorly controlled asthma who do become infected, they added.

“The findings from this linkage of multiple data sources have helped inform the prioritisation of school-aged children with poorly controlled asthma for vaccines,” they concluded.
 

Findings support value of vaccination for children with asthma

“Pediatricians see many children who suffer from asthma, and although one could assume that these children would have more serious consequences from contracting COVID-19, the current study examines a large database in a way not possible in the United States to address the severity question,” said Suzanne C. Boulter, MD, of the Geisel School of Medicine at Dartmouth, Hanover, N.H. “The authors used prior hospitalization rate or two prescriptions for oral corticosteroids as markers of asthma severity prior to the onset of COVID-19 in Scotland, and they collected retrospective data for 16 months of the pandemic through July of 2021, showing a significant increase in hospitalization for those children,” she said. Dr. Boulter said she was not surprised by this finding, given the impact of COVID-19 on the respiratory system.

“Pediatricians have found significant challenges from some groups of parents when discussing the indications and need for vaccination in their patients,” said Dr. Boulter. “Having this data on the increased risk of morbidity and mortality in children with asthma might help parents who are uncertain about the risk/benefit ratio of the vaccine make their decision,” she said.

Dr. Boulter said she hoped that additional studies will yield ongoing information about hospitalization rates for COVID-19 not only about asthma, but also other diagnoses affecting children in the United States and worldwide.

“It would also be important to see a breakdown of ethnic factors and adverse childhood experiences and how they relate to hospitalization and death from COVID-19,” Dr. Boulter said.

“The results of this study are not surprising, as we have known for a long time that children with severe asthma are more susceptible to severe respiratory viruses,” Francis E. Rushton, MD, a pediatrician in Beaufort, S.C., said in an interview. “But the study is still important, as it helps us determine which children are most urgently in need of protection from COVID-19 in any of its forms,” he emphasized. In particular, the current study underlines the importance of vaccinating children with unstable asthma, Dr. Rushton said.

Going forward, “it would be interesting to do additional studies looking at other markers for poor asthma control that could guide our vaccine efforts so that they are focused on those most at risk,” he added.

The study was supported by the UK Research and Innovation (Medical Research Council), Research and Innovation Industrial Strategy Challenge Fund, Health Data Research UK, and the Scottish Government. Lead author Dr. Shi had no financial conflicts to disclose. Dr. Rushton and Dr. Boulter had no financial conflicts to disclose, but each serves on the Editorial Advisory Board of Pediatric News.

Children and adolescents with poorly controlled asthma were three to six times more likely to be hospitalized with COVID-19 infections, based on data from a national study of more than 750,000 children in Scotland.

Although the majority of COVID-19 cases in children have been mild, some children require hospitalization, wrote Ting Shi, PhD, of the University of Edinburgh (Scotland) and colleagues.

Vaccination policies to potentially reduce infection and hospitalization of children remain inconsistent, the researchers said. Identifying which school-age children would derive the greatest benefit from vaccination “could help to reduce the risk of infection and consequently the need for children to have time off school; and might also reduce the risk of spread of SARS-CoV-2 within schools and households,” but the potential benefits of vaccination for children with asthma in particular have not been well studied, they wrote.

The United Kingdom’s Joint Commission on Vaccination and Immunisation commissioned research on the rates of hospitalization among children with poorly controlled asthma. In a national incidence cohort study published in The Lancet Respiratory Medicine, the researchers reviewed data from all children aged 5-17 years in Scotland who were enrolled in the linked dataset of Early Pandemic Evaluation and Enhanced Surveillance of COVID-19 (EAVE II). The total number of children in the dataset was 752,867, and 63,463 (8.4%) of these had diagnosed asthma. Among the children with asthma, 4,339 (6.8%) had confirmed COVID-19 infections between March 1, 2020, and July 27, 2021. A total of 67 infected children were hospitalized. Of the 689,404 children without asthma, 40,231 (5.8%) had confirmed COVID-19 infections, and 382 (0.9%) of these children were hospitalized.

Overall, hospital admission rates for COVID-19 were significantly higher among children with asthma, compared to those without asthma (adjusted hazard ratio, 1.49), and the rates increased among children with poorly controlled asthma.

The researchers used previous hospital admission for asthma as a measure of uncontrolled asthma, and found that hospitalization was at least six times as likely for children with poorly controlled asthma, compared with those with no asthma (aHR, 6.40), although children with well-controlled asthma also had an increased risk of hospitalization, compared with those with no asthma (aHR, 1.36).

When the researchers used oral corticosteroid prescriptions as an indicator of uncontrolled asthma, the adjusted hazard ratios were 3.38, 3.53, 1.52, and 1.34 for children with prescribed corticosteroid courses of three or more, two, one, and none, respectively, compared with children with no asthma.

These hazard ratios remained significant after controlling for factors including age, sex, socioeconomic status, comorbidity, and previous hospital admission, the researchers wrote.

In an age-based analysis, results were similar for children aged 12-17 years, but in children aged 5-11 years, the hospitalization risk decreased for those with one course of corticosteroids and reached the highest rate for those with three or more courses, rather than two courses.

The study findings were limited by several factors including the relatively small numbers of COVID-19 hospitalizations, ICU admissions, and deaths in children with asthma, the researchers noted. Other limitations include potential changes in asthma control over the study period, and lack of data on certain confounders such as tobacco use, unsuitable housing, and ethnicity, they noted. However, the results were strengthened by the use of a large, national dataset, and access to electronic health records, they said.

The findings reflect data from previous studies suggesting increased risk of hospitalization for patients with respiratory illness who develop COVID-19 infections, the researchers wrote.

The results emphasize the importance of good asthma control to protect children from severe COVID-19, and careful monitoring of children with poorly controlled asthma who do become infected, they added.

“The findings from this linkage of multiple data sources have helped inform the prioritisation of school-aged children with poorly controlled asthma for vaccines,” they concluded.
 

Findings support value of vaccination for children with asthma

“Pediatricians see many children who suffer from asthma, and although one could assume that these children would have more serious consequences from contracting COVID-19, the current study examines a large database in a way not possible in the United States to address the severity question,” said Suzanne C. Boulter, MD, of the Geisel School of Medicine at Dartmouth, Hanover, N.H. “The authors used prior hospitalization rate or two prescriptions for oral corticosteroids as markers of asthma severity prior to the onset of COVID-19 in Scotland, and they collected retrospective data for 16 months of the pandemic through July of 2021, showing a significant increase in hospitalization for those children,” she said. Dr. Boulter said she was not surprised by this finding, given the impact of COVID-19 on the respiratory system.

“Pediatricians have found significant challenges from some groups of parents when discussing the indications and need for vaccination in their patients,” said Dr. Boulter. “Having this data on the increased risk of morbidity and mortality in children with asthma might help parents who are uncertain about the risk/benefit ratio of the vaccine make their decision,” she said.

Dr. Boulter said she hoped that additional studies will yield ongoing information about hospitalization rates for COVID-19 not only about asthma, but also other diagnoses affecting children in the United States and worldwide.

“It would also be important to see a breakdown of ethnic factors and adverse childhood experiences and how they relate to hospitalization and death from COVID-19,” Dr. Boulter said.

“The results of this study are not surprising, as we have known for a long time that children with severe asthma are more susceptible to severe respiratory viruses,” Francis E. Rushton, MD, a pediatrician in Beaufort, S.C., said in an interview. “But the study is still important, as it helps us determine which children are most urgently in need of protection from COVID-19 in any of its forms,” he emphasized. In particular, the current study underlines the importance of vaccinating children with unstable asthma, Dr. Rushton said.

Going forward, “it would be interesting to do additional studies looking at other markers for poor asthma control that could guide our vaccine efforts so that they are focused on those most at risk,” he added.

The study was supported by the UK Research and Innovation (Medical Research Council), Research and Innovation Industrial Strategy Challenge Fund, Health Data Research UK, and the Scottish Government. Lead author Dr. Shi had no financial conflicts to disclose. Dr. Rushton and Dr. Boulter had no financial conflicts to disclose, but each serves on the Editorial Advisory Board of Pediatric News.

Both sickle cell trait and sickle cell disease were significantly associated with an increased risk of stillbirth, based on data from more than 50,000 women.

Pregnant women with sickle cell disease (SCD) are at increased risk of complications, including stillbirth, but many women with the disease in the United States lack access to specialty care, Silvia P. Canelón, PhD, of the University of Pennsylvania, Philadelphia, and colleagues wrote. Sickle cell trait (SCT), defined as one abnormal allele of the hemoglobin gene, is not considered a disease state because many carriers are asymptomatic, and therefore even less likely to be assessed for potential complications. “However, it is possible for people with SCT to experience sickling of red blood cells under severe hypoxia, dehydration, and hyperthermia. This condition can lead to severe medical complications for sickle cell carriers, including fetal loss, splenic infarction, exercise-related sudden death, and others,” they noted.

In a study published in JAMA Network Open, the researchers reviewed data from 63,334 deliveries in 50,560 women between Jan. 1, 2010, and Aug. 15, 2017, at four quaternary academic medical centers in Pennsylvania. Of these, 1,904 had SCT but not SCD, and 164 had SCD. The mean age of the women was 29.5 years, and approximately 56% were single at the time of delivery. A majority (87%) of the study population was Rhesus-factor positive, 47.0% were Black or African American, 33.7% were White, and 45.2% had ABO blood type O.

Risk factors for stillbirth used in the analysis included SCD, numbers of pain crises and blood transfusions before delivery, delivery episode (to represent parity), history of cesarean delivery, multiple gestation, age, marital status, race and ethnicity, ABO blood type, Rhesus factor, and year of delivery.

Overall, the prevalence of stillbirth in women with SCT was 1.1%, compared with 0.8% in the general study population, and was significantly associated with increased risk of stillbirth after controlling for multiple risk factors. The adjusted odds ratio was 8.94 for stillbirth risk in women with SCT, compared with women without SCT (P = .045), although the risk was greater among women with SCD, compared with those without SCD (aOR, 26.40).

“In addition, the stratified analysis found Black or African American patients with SCD to be at higher risk of stillbirth, compared with Black or African American patients without SCD (aOR, 3.59),” but no significant association was noted between stillbirth and SCT, the researchers wrote. Stillbirth rates were 1.1% in Black or African American women overall, 2.7% in those with SCD, and 1.0% in those with SCT. Overall, multiple gestation was associated with an increased risk of stillbirth (aOR, 4.68), while a history of cesarean delivery and being married at the time of delivery were associated with decreased risk (aOR, 0.44 and 0.72, respectively).

The lack of association between stillbirth and SCT in Black or African American patients supports some previous research, but contradicts other studies, the researchers wrote. “Ultimately, it may be impossible to disentangle the risks due to the disease and those due to disparities associated with the disease that have resulted from longstanding inequity and stigma,” they said. The findings also suggest that biological mechanisms of SCT may contribute to severe clinical complications, and therefore “invite a more critical examination of the assumption that SCT is not a disease state.”

The study findings were limited by several factors including the lack of assessment of SCT independent of other comorbidities, such as hypertension, preeclampsia, diabetes, and obesity, and by the use of billing codes that could misclassify patients, the researchers noted.

However, the results support some findings from previous studies of the potential health complications for pregnant SCT patients. The large study population highlights the need to identify women’s SCT status during obstetric care, and to provide both pregnancy guidance for SCT patients and systemic support of comprehensive care for SCD and SCT patients, they concluded.

Disparities may drive stillbirth in sickle cell trait women

“There is a paucity of research evaluating sickle cell trait and the risk of adverse pregnancy outcomes such as stillbirth,” Iris Krishna, MD, of Emory University, Atlanta, said in an interview. “Prior studies evaluating the risk of stillbirth have yielded mixed results, and an increased risk of stillbirth in women with sickle cell trait has not been established. This study is unique in that it attempts to address how racial inequities and health disparities may contribute to risk of stillbirth in women with sickle cell trait.”

Although the study findings suggest an increased risk of stillbirth in women with sickle cell trait, an analysis stratified for Black or African American patients showed no association, Dr. Krishna said. “The prevalence of stillbirth was noted to be 1% among Black or African American patients with sickle cell trait compared to the prevalence of stillbirth of 1.1% among Black or African American women with no sickle cell trait or disease. Although, sickle cell trait or sickle cell disease can be found in any racial or ethnic group, it disproportionately affects Black or African Americans, with a sickle cell trait carrier rate of approximately 1 in 10. The mixed findings in this study amongst racial/ethnic groups further suggest that there is more research needed before an association between stillbirth and sickle cell trait can be supported.”

As for clinical implications, “it is well established that for women with sickle cell trait there is an increased risk of urinary tract infections in pregnancy,” said Dr. Krishna. “Women with sickle cell trait should have a urine culture performed at their first prenatal visit and each trimester. At this time, studies evaluating risk of stillbirth in women with sickle cell trait have yielded conflicting results, and current consensus is that women with sickle cell trait are not at increased risk. In comparison, women with sickle cell disease are at increased risk for stillbirth and adverse pregnancy outcomes. Women with sickle cell disease should be followed closely during pregnancy and fetal surveillance implemented at 32 weeks, if not sooner, to reduce risk of stillbirth.

“Prior studies evaluating risk of stillbirth in women with sickle cell trait consist of retrospective cohorts with small study populations,” Dr. Krishna added. Notably, the current study was limited by the inability to adjust for comorbidities including diabetes, hypertension, and obesity, that are not only associated with an increased risk for stillbirth, but also disproportionately common among Black women.

“More studies are needed evaluating the relationship between these comorbidities as well as studies specifically evaluating how race affects care and pregnancy outcomes,” Dr. Krisha emphasized.

The study was funded by the University of Pennsylvania department of biostatistics, epidemiology, and informatics. Lead author Dr. Canelón disclosed grants from the Centers for Disease Control and Prevention, Clinical and Translational Science Awards, and grants from the National Institutes of Health outside the submitted work. Dr. Krishna had no financial conflicts to disclose, but serves on the editorial advisory board of Ob.Gyn News.

Both sickle cell trait and sickle cell disease were significantly associated with an increased risk of stillbirth, based on data from more than 50,000 women.

Pregnant women with sickle cell disease (SCD) are at increased risk of complications, including stillbirth, but many women with the disease in the United States lack access to specialty care, Silvia P. Canelón, PhD, of the University of Pennsylvania, Philadelphia, and colleagues wrote. Sickle cell trait (SCT), defined as one abnormal allele of the hemoglobin gene, is not considered a disease state because many carriers are asymptomatic, and therefore even less likely to be assessed for potential complications. “However, it is possible for people with SCT to experience sickling of red blood cells under severe hypoxia, dehydration, and hyperthermia. This condition can lead to severe medical complications for sickle cell carriers, including fetal loss, splenic infarction, exercise-related sudden death, and others,” they noted.

In a study published in JAMA Network Open, the researchers reviewed data from 63,334 deliveries in 50,560 women between Jan. 1, 2010, and Aug. 15, 2017, at four quaternary academic medical centers in Pennsylvania. Of these, 1,904 had SCT but not SCD, and 164 had SCD. The mean age of the women was 29.5 years, and approximately 56% were single at the time of delivery. A majority (87%) of the study population was Rhesus-factor positive, 47.0% were Black or African American, 33.7% were White, and 45.2% had ABO blood type O.

Risk factors for stillbirth used in the analysis included SCD, numbers of pain crises and blood transfusions before delivery, delivery episode (to represent parity), history of cesarean delivery, multiple gestation, age, marital status, race and ethnicity, ABO blood type, Rhesus factor, and year of delivery.

Overall, the prevalence of stillbirth in women with SCT was 1.1%, compared with 0.8% in the general study population, and was significantly associated with increased risk of stillbirth after controlling for multiple risk factors. The adjusted odds ratio was 8.94 for stillbirth risk in women with SCT, compared with women without SCT (P = .045), although the risk was greater among women with SCD, compared with those without SCD (aOR, 26.40).

“In addition, the stratified analysis found Black or African American patients with SCD to be at higher risk of stillbirth, compared with Black or African American patients without SCD (aOR, 3.59),” but no significant association was noted between stillbirth and SCT, the researchers wrote. Stillbirth rates were 1.1% in Black or African American women overall, 2.7% in those with SCD, and 1.0% in those with SCT. Overall, multiple gestation was associated with an increased risk of stillbirth (aOR, 4.68), while a history of cesarean delivery and being married at the time of delivery were associated with decreased risk (aOR, 0.44 and 0.72, respectively).

The lack of association between stillbirth and SCT in Black or African American patients supports some previous research, but contradicts other studies, the researchers wrote. “Ultimately, it may be impossible to disentangle the risks due to the disease and those due to disparities associated with the disease that have resulted from longstanding inequity and stigma,” they said. The findings also suggest that biological mechanisms of SCT may contribute to severe clinical complications, and therefore “invite a more critical examination of the assumption that SCT is not a disease state.”

The study findings were limited by several factors including the lack of assessment of SCT independent of other comorbidities, such as hypertension, preeclampsia, diabetes, and obesity, and by the use of billing codes that could misclassify patients, the researchers noted.

However, the results support some findings from previous studies of the potential health complications for pregnant SCT patients. The large study population highlights the need to identify women’s SCT status during obstetric care, and to provide both pregnancy guidance for SCT patients and systemic support of comprehensive care for SCD and SCT patients, they concluded.

Disparities may drive stillbirth in sickle cell trait women

“There is a paucity of research evaluating sickle cell trait and the risk of adverse pregnancy outcomes such as stillbirth,” Iris Krishna, MD, of Emory University, Atlanta, said in an interview. “Prior studies evaluating the risk of stillbirth have yielded mixed results, and an increased risk of stillbirth in women with sickle cell trait has not been established. This study is unique in that it attempts to address how racial inequities and health disparities may contribute to risk of stillbirth in women with sickle cell trait.”

Although the study findings suggest an increased risk of stillbirth in women with sickle cell trait, an analysis stratified for Black or African American patients showed no association, Dr. Krishna said. “The prevalence of stillbirth was noted to be 1% among Black or African American patients with sickle cell trait compared to the prevalence of stillbirth of 1.1% among Black or African American women with no sickle cell trait or disease. Although, sickle cell trait or sickle cell disease can be found in any racial or ethnic group, it disproportionately affects Black or African Americans, with a sickle cell trait carrier rate of approximately 1 in 10. The mixed findings in this study amongst racial/ethnic groups further suggest that there is more research needed before an association between stillbirth and sickle cell trait can be supported.”

As for clinical implications, “it is well established that for women with sickle cell trait there is an increased risk of urinary tract infections in pregnancy,” said Dr. Krishna. “Women with sickle cell trait should have a urine culture performed at their first prenatal visit and each trimester. At this time, studies evaluating risk of stillbirth in women with sickle cell trait have yielded conflicting results, and current consensus is that women with sickle cell trait are not at increased risk. In comparison, women with sickle cell disease are at increased risk for stillbirth and adverse pregnancy outcomes. Women with sickle cell disease should be followed closely during pregnancy and fetal surveillance implemented at 32 weeks, if not sooner, to reduce risk of stillbirth.

“Prior studies evaluating risk of stillbirth in women with sickle cell trait consist of retrospective cohorts with small study populations,” Dr. Krishna added. Notably, the current study was limited by the inability to adjust for comorbidities including diabetes, hypertension, and obesity, that are not only associated with an increased risk for stillbirth, but also disproportionately common among Black women.

“More studies are needed evaluating the relationship between these comorbidities as well as studies specifically evaluating how race affects care and pregnancy outcomes,” Dr. Krisha emphasized.

The study was funded by the University of Pennsylvania department of biostatistics, epidemiology, and informatics. Lead author Dr. Canelón disclosed grants from the Centers for Disease Control and Prevention, Clinical and Translational Science Awards, and grants from the National Institutes of Health outside the submitted work. Dr. Krishna had no financial conflicts to disclose, but serves on the editorial advisory board of Ob.Gyn News.

Both sickle cell trait and sickle cell disease were significantly associated with an increased risk of stillbirth, based on data from more than 50,000 women.

Pregnant women with sickle cell disease (SCD) are at increased risk of complications, including stillbirth, but many women with the disease in the United States lack access to specialty care, Silvia P. Canelón, PhD, of the University of Pennsylvania, Philadelphia, and colleagues wrote. Sickle cell trait (SCT), defined as one abnormal allele of the hemoglobin gene, is not considered a disease state because many carriers are asymptomatic, and therefore even less likely to be assessed for potential complications. “However, it is possible for people with SCT to experience sickling of red blood cells under severe hypoxia, dehydration, and hyperthermia. This condition can lead to severe medical complications for sickle cell carriers, including fetal loss, splenic infarction, exercise-related sudden death, and others,” they noted.

In a study published in JAMA Network Open, the researchers reviewed data from 63,334 deliveries in 50,560 women between Jan. 1, 2010, and Aug. 15, 2017, at four quaternary academic medical centers in Pennsylvania. Of these, 1,904 had SCT but not SCD, and 164 had SCD. The mean age of the women was 29.5 years, and approximately 56% were single at the time of delivery. A majority (87%) of the study population was Rhesus-factor positive, 47.0% were Black or African American, 33.7% were White, and 45.2% had ABO blood type O.

Risk factors for stillbirth used in the analysis included SCD, numbers of pain crises and blood transfusions before delivery, delivery episode (to represent parity), history of cesarean delivery, multiple gestation, age, marital status, race and ethnicity, ABO blood type, Rhesus factor, and year of delivery.

Overall, the prevalence of stillbirth in women with SCT was 1.1%, compared with 0.8% in the general study population, and was significantly associated with increased risk of stillbirth after controlling for multiple risk factors. The adjusted odds ratio was 8.94 for stillbirth risk in women with SCT, compared with women without SCT (P = .045), although the risk was greater among women with SCD, compared with those without SCD (aOR, 26.40).

“In addition, the stratified analysis found Black or African American patients with SCD to be at higher risk of stillbirth, compared with Black or African American patients without SCD (aOR, 3.59),” but no significant association was noted between stillbirth and SCT, the researchers wrote. Stillbirth rates were 1.1% in Black or African American women overall, 2.7% in those with SCD, and 1.0% in those with SCT. Overall, multiple gestation was associated with an increased risk of stillbirth (aOR, 4.68), while a history of cesarean delivery and being married at the time of delivery were associated with decreased risk (aOR, 0.44 and 0.72, respectively).

The lack of association between stillbirth and SCT in Black or African American patients supports some previous research, but contradicts other studies, the researchers wrote. “Ultimately, it may be impossible to disentangle the risks due to the disease and those due to disparities associated with the disease that have resulted from longstanding inequity and stigma,” they said. The findings also suggest that biological mechanisms of SCT may contribute to severe clinical complications, and therefore “invite a more critical examination of the assumption that SCT is not a disease state.”

The study findings were limited by several factors including the lack of assessment of SCT independent of other comorbidities, such as hypertension, preeclampsia, diabetes, and obesity, and by the use of billing codes that could misclassify patients, the researchers noted.

However, the results support some findings from previous studies of the potential health complications for pregnant SCT patients. The large study population highlights the need to identify women’s SCT status during obstetric care, and to provide both pregnancy guidance for SCT patients and systemic support of comprehensive care for SCD and SCT patients, they concluded.

Disparities may drive stillbirth in sickle cell trait women

“There is a paucity of research evaluating sickle cell trait and the risk of adverse pregnancy outcomes such as stillbirth,” Iris Krishna, MD, of Emory University, Atlanta, said in an interview. “Prior studies evaluating the risk of stillbirth have yielded mixed results, and an increased risk of stillbirth in women with sickle cell trait has not been established. This study is unique in that it attempts to address how racial inequities and health disparities may contribute to risk of stillbirth in women with sickle cell trait.”

Although the study findings suggest an increased risk of stillbirth in women with sickle cell trait, an analysis stratified for Black or African American patients showed no association, Dr. Krishna said. “The prevalence of stillbirth was noted to be 1% among Black or African American patients with sickle cell trait compared to the prevalence of stillbirth of 1.1% among Black or African American women with no sickle cell trait or disease. Although, sickle cell trait or sickle cell disease can be found in any racial or ethnic group, it disproportionately affects Black or African Americans, with a sickle cell trait carrier rate of approximately 1 in 10. The mixed findings in this study amongst racial/ethnic groups further suggest that there is more research needed before an association between stillbirth and sickle cell trait can be supported.”

As for clinical implications, “it is well established that for women with sickle cell trait there is an increased risk of urinary tract infections in pregnancy,” said Dr. Krishna. “Women with sickle cell trait should have a urine culture performed at their first prenatal visit and each trimester. At this time, studies evaluating risk of stillbirth in women with sickle cell trait have yielded conflicting results, and current consensus is that women with sickle cell trait are not at increased risk. In comparison, women with sickle cell disease are at increased risk for stillbirth and adverse pregnancy outcomes. Women with sickle cell disease should be followed closely during pregnancy and fetal surveillance implemented at 32 weeks, if not sooner, to reduce risk of stillbirth.

“Prior studies evaluating risk of stillbirth in women with sickle cell trait consist of retrospective cohorts with small study populations,” Dr. Krishna added. Notably, the current study was limited by the inability to adjust for comorbidities including diabetes, hypertension, and obesity, that are not only associated with an increased risk for stillbirth, but also disproportionately common among Black women.

“More studies are needed evaluating the relationship between these comorbidities as well as studies specifically evaluating how race affects care and pregnancy outcomes,” Dr. Krisha emphasized.

The study was funded by the University of Pennsylvania department of biostatistics, epidemiology, and informatics. Lead author Dr. Canelón disclosed grants from the Centers for Disease Control and Prevention, Clinical and Translational Science Awards, and grants from the National Institutes of Health outside the submitted work. Dr. Krishna had no financial conflicts to disclose, but serves on the editorial advisory board of Ob.Gyn News.