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Epidiolex plus THC lowers seizures in pediatric epilepsy
the component of cannabis that makes people high in larger quantities, researchers reported.
“THC can contribute to seizure control and mitigation some of the side effects of CBD,” said study coauthor and Austin, Tex., child neurologist Karen Keough, MD, in an interview. Dr. Keough and colleagues presented their findings at the 50th annual meeting of the Child Neurology Society.
In a landmark move, the Food and Drug Administration approved Epidiolex in 2018 for the treatment of seizures in two rare forms of epilepsy, Lennox-Gastaut syndrome and Dravet syndrome. The agency had never before approved a drug with a purified ingredient derived from marijuana.
CBD, the active ingredient in Epidiolex, is nonpsychoactive. The use in medicine of THC, the main driver of marijuana’s ability to make people stoned, is much more controversial.
Dr. Keough said she had treated 60-70 children with CBD, at the same strength as in Epidiolex (100 mg), and 5 mg of THC before the drug was approved. “I was seeing some very impressive results, and some became seizure free who’d always been refractory,” she said.
When the Epidiolex became available, she said, some patients transitioned to it and stopped taking THC. According to her, some patients fared well. But others immediately experienced worse seizures, she said, and some developed side effects to Epidiolex in the absence of THC, such as agitation and appetite suppression.
Combination therapy
For the new study, a retrospective, unblinded cohort analysis, Dr. Keough and colleagues tracked patients who received various doses of CBD, in some cases as Epidiolex, and various doses of THC prescribed by the Texas Original Compassionate Cultivation dispensary, where she serves as chief medical officer.
The initial number of patients was 212; 135 consented to review and 10 were excluded for various reasons leaving a total of 74 subjects in the study. The subjects, whose median age at the start of the study was 12 years (range, 2-25 years), were tracked from 2018 to2021. Just over half (55%) were male, and they remained on the regimen for a median of 805 days (range, 400-1,141).
Of the 74 subjects, 45.9% had a reduction of seizures of more than 75%, and 20.3% had a reduction of 50%-75%. Only 4.1% saw their seizures worsen.
The THC doses varied from none to more than 12 mg/day; CBD doses varied from none to more than 26 mg/kg per day. O the 74 patients, 18 saw their greatest seizure reduction from baseline when they received no THC; 12 saw their greatest seizure reduction from baseline when they received 0-2 mg/kg per day of CBD.
Still controversial
Did the patients get high? In some cases they did, Dr. Keough said. However, “a lot of these patients are either too young or too cognitively limited to describe whether they’re feeling intoxicated. That’s one of the many reasons why this is so controversial. You have to go into this with eyes wide open. We’re working in an environment with limited information as to what an intoxicating dose is for a small kid.”
However, she said, it seems clear that “THC can enhance the effect of CBD in children with epilepsy” and reduce CBD side effects. It’s not surprising that the substances work differently since they interact with brain cells in different ways, she said.
For neurologists, she said, “the challenge is to find a reliable source of THC that you can count on and verify so you aren’t overdosing the patients.”
University of Saskatchewan, Saskatoon, child neurologist and cannabinoid researcher Richard Huntsman, MD, who’s familiar with the study findings, said in an interview that they “provide another strong signal that the addition of THC provides benefit, at least in some patients.”
But it’s still unclear “why some children respond best in regards to seizure reduction and side effect profile with combination CBD:THC therapy, and others seemed to do better with CBD alone,” he said. Also unknown: “the ideal THC:CBD ratio that allows optimal seizure control while preventing the potential harmful effects of THC.”
As for the future, he said, “as we are just scratching the surface of our knowledge about the use of cannabis-based therapies in children with neurological disorders, I suspect that the use of these therapies will expand over time.”
No study funding is reported. Dr. Keough disclosed serving as chief medical officer of Texas Original Compassionate Cultivation. Dr. Huntsman disclosed serving as lead investigator of the Cannabidiol in Children with Refractory Epileptic Encephalopathy study and serving on the boards of the Cannabinoid Research Initiative of Saskatchewan (University of Saskatchewan) and Canadian Childhood Cannabinoid Clinical Trials Consortium. He is also cochair of Health Canada’s Scientific Advisory Committee on Cannabinoids for Health Purposes.
the component of cannabis that makes people high in larger quantities, researchers reported.
“THC can contribute to seizure control and mitigation some of the side effects of CBD,” said study coauthor and Austin, Tex., child neurologist Karen Keough, MD, in an interview. Dr. Keough and colleagues presented their findings at the 50th annual meeting of the Child Neurology Society.
In a landmark move, the Food and Drug Administration approved Epidiolex in 2018 for the treatment of seizures in two rare forms of epilepsy, Lennox-Gastaut syndrome and Dravet syndrome. The agency had never before approved a drug with a purified ingredient derived from marijuana.
CBD, the active ingredient in Epidiolex, is nonpsychoactive. The use in medicine of THC, the main driver of marijuana’s ability to make people stoned, is much more controversial.
Dr. Keough said she had treated 60-70 children with CBD, at the same strength as in Epidiolex (100 mg), and 5 mg of THC before the drug was approved. “I was seeing some very impressive results, and some became seizure free who’d always been refractory,” she said.
When the Epidiolex became available, she said, some patients transitioned to it and stopped taking THC. According to her, some patients fared well. But others immediately experienced worse seizures, she said, and some developed side effects to Epidiolex in the absence of THC, such as agitation and appetite suppression.
Combination therapy
For the new study, a retrospective, unblinded cohort analysis, Dr. Keough and colleagues tracked patients who received various doses of CBD, in some cases as Epidiolex, and various doses of THC prescribed by the Texas Original Compassionate Cultivation dispensary, where she serves as chief medical officer.
The initial number of patients was 212; 135 consented to review and 10 were excluded for various reasons leaving a total of 74 subjects in the study. The subjects, whose median age at the start of the study was 12 years (range, 2-25 years), were tracked from 2018 to2021. Just over half (55%) were male, and they remained on the regimen for a median of 805 days (range, 400-1,141).
Of the 74 subjects, 45.9% had a reduction of seizures of more than 75%, and 20.3% had a reduction of 50%-75%. Only 4.1% saw their seizures worsen.
The THC doses varied from none to more than 12 mg/day; CBD doses varied from none to more than 26 mg/kg per day. O the 74 patients, 18 saw their greatest seizure reduction from baseline when they received no THC; 12 saw their greatest seizure reduction from baseline when they received 0-2 mg/kg per day of CBD.
Still controversial
Did the patients get high? In some cases they did, Dr. Keough said. However, “a lot of these patients are either too young or too cognitively limited to describe whether they’re feeling intoxicated. That’s one of the many reasons why this is so controversial. You have to go into this with eyes wide open. We’re working in an environment with limited information as to what an intoxicating dose is for a small kid.”
However, she said, it seems clear that “THC can enhance the effect of CBD in children with epilepsy” and reduce CBD side effects. It’s not surprising that the substances work differently since they interact with brain cells in different ways, she said.
For neurologists, she said, “the challenge is to find a reliable source of THC that you can count on and verify so you aren’t overdosing the patients.”
University of Saskatchewan, Saskatoon, child neurologist and cannabinoid researcher Richard Huntsman, MD, who’s familiar with the study findings, said in an interview that they “provide another strong signal that the addition of THC provides benefit, at least in some patients.”
But it’s still unclear “why some children respond best in regards to seizure reduction and side effect profile with combination CBD:THC therapy, and others seemed to do better with CBD alone,” he said. Also unknown: “the ideal THC:CBD ratio that allows optimal seizure control while preventing the potential harmful effects of THC.”
As for the future, he said, “as we are just scratching the surface of our knowledge about the use of cannabis-based therapies in children with neurological disorders, I suspect that the use of these therapies will expand over time.”
No study funding is reported. Dr. Keough disclosed serving as chief medical officer of Texas Original Compassionate Cultivation. Dr. Huntsman disclosed serving as lead investigator of the Cannabidiol in Children with Refractory Epileptic Encephalopathy study and serving on the boards of the Cannabinoid Research Initiative of Saskatchewan (University of Saskatchewan) and Canadian Childhood Cannabinoid Clinical Trials Consortium. He is also cochair of Health Canada’s Scientific Advisory Committee on Cannabinoids for Health Purposes.
the component of cannabis that makes people high in larger quantities, researchers reported.
“THC can contribute to seizure control and mitigation some of the side effects of CBD,” said study coauthor and Austin, Tex., child neurologist Karen Keough, MD, in an interview. Dr. Keough and colleagues presented their findings at the 50th annual meeting of the Child Neurology Society.
In a landmark move, the Food and Drug Administration approved Epidiolex in 2018 for the treatment of seizures in two rare forms of epilepsy, Lennox-Gastaut syndrome and Dravet syndrome. The agency had never before approved a drug with a purified ingredient derived from marijuana.
CBD, the active ingredient in Epidiolex, is nonpsychoactive. The use in medicine of THC, the main driver of marijuana’s ability to make people stoned, is much more controversial.
Dr. Keough said she had treated 60-70 children with CBD, at the same strength as in Epidiolex (100 mg), and 5 mg of THC before the drug was approved. “I was seeing some very impressive results, and some became seizure free who’d always been refractory,” she said.
When the Epidiolex became available, she said, some patients transitioned to it and stopped taking THC. According to her, some patients fared well. But others immediately experienced worse seizures, she said, and some developed side effects to Epidiolex in the absence of THC, such as agitation and appetite suppression.
Combination therapy
For the new study, a retrospective, unblinded cohort analysis, Dr. Keough and colleagues tracked patients who received various doses of CBD, in some cases as Epidiolex, and various doses of THC prescribed by the Texas Original Compassionate Cultivation dispensary, where she serves as chief medical officer.
The initial number of patients was 212; 135 consented to review and 10 were excluded for various reasons leaving a total of 74 subjects in the study. The subjects, whose median age at the start of the study was 12 years (range, 2-25 years), were tracked from 2018 to2021. Just over half (55%) were male, and they remained on the regimen for a median of 805 days (range, 400-1,141).
Of the 74 subjects, 45.9% had a reduction of seizures of more than 75%, and 20.3% had a reduction of 50%-75%. Only 4.1% saw their seizures worsen.
The THC doses varied from none to more than 12 mg/day; CBD doses varied from none to more than 26 mg/kg per day. O the 74 patients, 18 saw their greatest seizure reduction from baseline when they received no THC; 12 saw their greatest seizure reduction from baseline when they received 0-2 mg/kg per day of CBD.
Still controversial
Did the patients get high? In some cases they did, Dr. Keough said. However, “a lot of these patients are either too young or too cognitively limited to describe whether they’re feeling intoxicated. That’s one of the many reasons why this is so controversial. You have to go into this with eyes wide open. We’re working in an environment with limited information as to what an intoxicating dose is for a small kid.”
However, she said, it seems clear that “THC can enhance the effect of CBD in children with epilepsy” and reduce CBD side effects. It’s not surprising that the substances work differently since they interact with brain cells in different ways, she said.
For neurologists, she said, “the challenge is to find a reliable source of THC that you can count on and verify so you aren’t overdosing the patients.”
University of Saskatchewan, Saskatoon, child neurologist and cannabinoid researcher Richard Huntsman, MD, who’s familiar with the study findings, said in an interview that they “provide another strong signal that the addition of THC provides benefit, at least in some patients.”
But it’s still unclear “why some children respond best in regards to seizure reduction and side effect profile with combination CBD:THC therapy, and others seemed to do better with CBD alone,” he said. Also unknown: “the ideal THC:CBD ratio that allows optimal seizure control while preventing the potential harmful effects of THC.”
As for the future, he said, “as we are just scratching the surface of our knowledge about the use of cannabis-based therapies in children with neurological disorders, I suspect that the use of these therapies will expand over time.”
No study funding is reported. Dr. Keough disclosed serving as chief medical officer of Texas Original Compassionate Cultivation. Dr. Huntsman disclosed serving as lead investigator of the Cannabidiol in Children with Refractory Epileptic Encephalopathy study and serving on the boards of the Cannabinoid Research Initiative of Saskatchewan (University of Saskatchewan) and Canadian Childhood Cannabinoid Clinical Trials Consortium. He is also cochair of Health Canada’s Scientific Advisory Committee on Cannabinoids for Health Purposes.
FROM CNS 2021
Is genetic testing valuable in the clinical management of epilepsy?
, new research shows.
Results of a survey that included more than 400 patients showed that positive findings from genetic testing helped guide clinical management in 50% of cases and improved patient outcomes in 75%. In addition, the findings were applicable to both children and adults.
“Fifty percent of the time the physicians reported that, yes, receiving the genetic diagnosis did change how they managed the patients,” reported co-investigator Dianalee McKnight, PhD, director of medical affairs at Invitae, a medical genetic testing company headquartered in San Francisco. In 81.3% of cases, providers reported they changed clinical management within 3 months of receiving the genetic results, she added.
The findings were presented at the 2021 World Congress of Neurology (WCN).
Test results can be practice-changing
Nearly 50% of positive genetic test results in epilepsy patients can help guide clinical management, Dr. McKnight noted. However, information on how physicians use genetic information in decision-making has been limited, prompting her conduct the survey.
A total of 1,567 physicians with 3,572 patients who had a definitive diagnosis of epilepsy were contacted. A total of 170 (10.8%) clinicians provided completed and eligible surveys on 429 patients with epilepsy.
The patient cohort comprised mostly children, with nearly 50 adults, which Dr. McKnight said is typical of the population receiving genetic testing in clinical practice.
She reported that genetic testing results prompted clinicians to make medication changes about 50% of the time. Other changes included specialist referral or to a clinical trial, monitoring for other neurological disease, and recommendations for dietary change or for surgery.
“Of the physicians who changed treatment, 75% reported there were positive outcomes for the patients,” Dr. McKnight told meeting attendees. “Most common was a reduction or a complete elimination of seizures, and that was reported in 65% of the cases.”
In many cases, the changes resulted in clinical improvements.
“There were 64 individuals who were having daily seizures before the genetic testing,” Dr. McKnight reported via email. “After receiving the genetic diagnosis and modifying their treatment, their physicians reported that 26% of individuals had complete seizure control and 46% of individuals had reduced seizure frequency to either weekly (20%), monthly (20%) or annually (6%).”
The best seizure control after modifying disease management occurred among children. Although the changes were not as dramatic for adults, they trended toward lower seizure frequency.
“It is still pretty significant that adults can receive genetic testing later in life and still have benefit in controlling their seizures,” Dr. McKnight said.
Twenty-three percent of patients showed improvement in behavior, development, academics, or movement issues, while 6% experienced reduced medication side effects.
Dr. McKnight also explored reasons for physicians not making changes to clinical management of patients based on the genetic results. The most common reason was that management was already consistent with the results (47.3%), followed by the results not being informative (26.1%), the results possibly being useful for future treatments in development (19.0%), or other or unknown reasons (7.6%).
Besides direct health and quality of life benefits from better seizure control, Dr. McKnight cited previous economic studies showing lower health care costs.
“It looked like an individual who has good seizure control will incur about 14,000 U.S. dollars a year compared with an individual with pretty poor seizure control, where it can be closer to 23,000 U.S. dollars a year,” Dr. McKnight said. This is mainly attributed to reduced hospitalizations and emergency department visits.
Dr. McKnight noted that currently there is no cost of genetic testing to the patient, the hospital, or insurers. Pharmaceutical companies, she said, sponsor the testing to potentially gather patients for clinical drug trials in development. However, patients remain completely anonymous.
Physicians who wish to have patient samples tested agree that the companies may contact them to ask if any of their patients with positive genetic test results would like to participate in a trial.
Dr. McKnight noted that genetic testing can be considered actionable in the clinic, helping to guide clinical decision-making and potentially leading to better outcomes. Going forward, she suggested performing large case-controlled studies “of individuals with the same genetic etiology ... to really find a true causation or correlation.”
Growing influence of genetic testing
Commenting on the findings, Jaysingh Singh, MD, co-director of the Epilepsy Surgery Center at the Ohio State University Wexner Medical Center in Columbus, noted that the study highlights the value of gene testing in improving outcomes in patients with epilepsy, particularly the pediatric population.
He said the findings make him optimistic about the potential of genetic testing in adult patients – with at least one caveat.
“The limitation is that if we do find some mutation, we don’t know what to do with that. That’s definitely one challenge. And we see that more often in the adult patient population,” said Dr. Singh, who was not involved with the research.
He noted that there is a small group of genetic mutations when, found in adults, may dramatically alter treatment.
For example, he noted that if there is a gene mutation related to mTOR pathways, that could provide a future target because there are already medications that target this pathway.
Genetic testing may also be useful in cases where patients have normal brain imaging and poor response to standard treatment or in cases where patients have congenital abnormalities such as intellectual impairment or facial dysmorphic features and a co-morbid seizure disorder, he said.
Dr. Singh noted that he has often found genetic testing impractical because “if I order DNA testing right now, it will take 4 months for me to get the results. I cannot wait 4 months for the results to come back” to adjust treatment.
Dr. McKnight is an employee of and a shareholder in Invitae, which funded the study. Dr. Singh has disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
, new research shows.
Results of a survey that included more than 400 patients showed that positive findings from genetic testing helped guide clinical management in 50% of cases and improved patient outcomes in 75%. In addition, the findings were applicable to both children and adults.
“Fifty percent of the time the physicians reported that, yes, receiving the genetic diagnosis did change how they managed the patients,” reported co-investigator Dianalee McKnight, PhD, director of medical affairs at Invitae, a medical genetic testing company headquartered in San Francisco. In 81.3% of cases, providers reported they changed clinical management within 3 months of receiving the genetic results, she added.
The findings were presented at the 2021 World Congress of Neurology (WCN).
Test results can be practice-changing
Nearly 50% of positive genetic test results in epilepsy patients can help guide clinical management, Dr. McKnight noted. However, information on how physicians use genetic information in decision-making has been limited, prompting her conduct the survey.
A total of 1,567 physicians with 3,572 patients who had a definitive diagnosis of epilepsy were contacted. A total of 170 (10.8%) clinicians provided completed and eligible surveys on 429 patients with epilepsy.
The patient cohort comprised mostly children, with nearly 50 adults, which Dr. McKnight said is typical of the population receiving genetic testing in clinical practice.
She reported that genetic testing results prompted clinicians to make medication changes about 50% of the time. Other changes included specialist referral or to a clinical trial, monitoring for other neurological disease, and recommendations for dietary change or for surgery.
“Of the physicians who changed treatment, 75% reported there were positive outcomes for the patients,” Dr. McKnight told meeting attendees. “Most common was a reduction or a complete elimination of seizures, and that was reported in 65% of the cases.”
In many cases, the changes resulted in clinical improvements.
“There were 64 individuals who were having daily seizures before the genetic testing,” Dr. McKnight reported via email. “After receiving the genetic diagnosis and modifying their treatment, their physicians reported that 26% of individuals had complete seizure control and 46% of individuals had reduced seizure frequency to either weekly (20%), monthly (20%) or annually (6%).”
The best seizure control after modifying disease management occurred among children. Although the changes were not as dramatic for adults, they trended toward lower seizure frequency.
“It is still pretty significant that adults can receive genetic testing later in life and still have benefit in controlling their seizures,” Dr. McKnight said.
Twenty-three percent of patients showed improvement in behavior, development, academics, or movement issues, while 6% experienced reduced medication side effects.
Dr. McKnight also explored reasons for physicians not making changes to clinical management of patients based on the genetic results. The most common reason was that management was already consistent with the results (47.3%), followed by the results not being informative (26.1%), the results possibly being useful for future treatments in development (19.0%), or other or unknown reasons (7.6%).
Besides direct health and quality of life benefits from better seizure control, Dr. McKnight cited previous economic studies showing lower health care costs.
“It looked like an individual who has good seizure control will incur about 14,000 U.S. dollars a year compared with an individual with pretty poor seizure control, where it can be closer to 23,000 U.S. dollars a year,” Dr. McKnight said. This is mainly attributed to reduced hospitalizations and emergency department visits.
Dr. McKnight noted that currently there is no cost of genetic testing to the patient, the hospital, or insurers. Pharmaceutical companies, she said, sponsor the testing to potentially gather patients for clinical drug trials in development. However, patients remain completely anonymous.
Physicians who wish to have patient samples tested agree that the companies may contact them to ask if any of their patients with positive genetic test results would like to participate in a trial.
Dr. McKnight noted that genetic testing can be considered actionable in the clinic, helping to guide clinical decision-making and potentially leading to better outcomes. Going forward, she suggested performing large case-controlled studies “of individuals with the same genetic etiology ... to really find a true causation or correlation.”
Growing influence of genetic testing
Commenting on the findings, Jaysingh Singh, MD, co-director of the Epilepsy Surgery Center at the Ohio State University Wexner Medical Center in Columbus, noted that the study highlights the value of gene testing in improving outcomes in patients with epilepsy, particularly the pediatric population.
He said the findings make him optimistic about the potential of genetic testing in adult patients – with at least one caveat.
“The limitation is that if we do find some mutation, we don’t know what to do with that. That’s definitely one challenge. And we see that more often in the adult patient population,” said Dr. Singh, who was not involved with the research.
He noted that there is a small group of genetic mutations when, found in adults, may dramatically alter treatment.
For example, he noted that if there is a gene mutation related to mTOR pathways, that could provide a future target because there are already medications that target this pathway.
Genetic testing may also be useful in cases where patients have normal brain imaging and poor response to standard treatment or in cases where patients have congenital abnormalities such as intellectual impairment or facial dysmorphic features and a co-morbid seizure disorder, he said.
Dr. Singh noted that he has often found genetic testing impractical because “if I order DNA testing right now, it will take 4 months for me to get the results. I cannot wait 4 months for the results to come back” to adjust treatment.
Dr. McKnight is an employee of and a shareholder in Invitae, which funded the study. Dr. Singh has disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
, new research shows.
Results of a survey that included more than 400 patients showed that positive findings from genetic testing helped guide clinical management in 50% of cases and improved patient outcomes in 75%. In addition, the findings were applicable to both children and adults.
“Fifty percent of the time the physicians reported that, yes, receiving the genetic diagnosis did change how they managed the patients,” reported co-investigator Dianalee McKnight, PhD, director of medical affairs at Invitae, a medical genetic testing company headquartered in San Francisco. In 81.3% of cases, providers reported they changed clinical management within 3 months of receiving the genetic results, she added.
The findings were presented at the 2021 World Congress of Neurology (WCN).
Test results can be practice-changing
Nearly 50% of positive genetic test results in epilepsy patients can help guide clinical management, Dr. McKnight noted. However, information on how physicians use genetic information in decision-making has been limited, prompting her conduct the survey.
A total of 1,567 physicians with 3,572 patients who had a definitive diagnosis of epilepsy were contacted. A total of 170 (10.8%) clinicians provided completed and eligible surveys on 429 patients with epilepsy.
The patient cohort comprised mostly children, with nearly 50 adults, which Dr. McKnight said is typical of the population receiving genetic testing in clinical practice.
She reported that genetic testing results prompted clinicians to make medication changes about 50% of the time. Other changes included specialist referral or to a clinical trial, monitoring for other neurological disease, and recommendations for dietary change or for surgery.
“Of the physicians who changed treatment, 75% reported there were positive outcomes for the patients,” Dr. McKnight told meeting attendees. “Most common was a reduction or a complete elimination of seizures, and that was reported in 65% of the cases.”
In many cases, the changes resulted in clinical improvements.
“There were 64 individuals who were having daily seizures before the genetic testing,” Dr. McKnight reported via email. “After receiving the genetic diagnosis and modifying their treatment, their physicians reported that 26% of individuals had complete seizure control and 46% of individuals had reduced seizure frequency to either weekly (20%), monthly (20%) or annually (6%).”
The best seizure control after modifying disease management occurred among children. Although the changes were not as dramatic for adults, they trended toward lower seizure frequency.
“It is still pretty significant that adults can receive genetic testing later in life and still have benefit in controlling their seizures,” Dr. McKnight said.
Twenty-three percent of patients showed improvement in behavior, development, academics, or movement issues, while 6% experienced reduced medication side effects.
Dr. McKnight also explored reasons for physicians not making changes to clinical management of patients based on the genetic results. The most common reason was that management was already consistent with the results (47.3%), followed by the results not being informative (26.1%), the results possibly being useful for future treatments in development (19.0%), or other or unknown reasons (7.6%).
Besides direct health and quality of life benefits from better seizure control, Dr. McKnight cited previous economic studies showing lower health care costs.
“It looked like an individual who has good seizure control will incur about 14,000 U.S. dollars a year compared with an individual with pretty poor seizure control, where it can be closer to 23,000 U.S. dollars a year,” Dr. McKnight said. This is mainly attributed to reduced hospitalizations and emergency department visits.
Dr. McKnight noted that currently there is no cost of genetic testing to the patient, the hospital, or insurers. Pharmaceutical companies, she said, sponsor the testing to potentially gather patients for clinical drug trials in development. However, patients remain completely anonymous.
Physicians who wish to have patient samples tested agree that the companies may contact them to ask if any of their patients with positive genetic test results would like to participate in a trial.
Dr. McKnight noted that genetic testing can be considered actionable in the clinic, helping to guide clinical decision-making and potentially leading to better outcomes. Going forward, she suggested performing large case-controlled studies “of individuals with the same genetic etiology ... to really find a true causation or correlation.”
Growing influence of genetic testing
Commenting on the findings, Jaysingh Singh, MD, co-director of the Epilepsy Surgery Center at the Ohio State University Wexner Medical Center in Columbus, noted that the study highlights the value of gene testing in improving outcomes in patients with epilepsy, particularly the pediatric population.
He said the findings make him optimistic about the potential of genetic testing in adult patients – with at least one caveat.
“The limitation is that if we do find some mutation, we don’t know what to do with that. That’s definitely one challenge. And we see that more often in the adult patient population,” said Dr. Singh, who was not involved with the research.
He noted that there is a small group of genetic mutations when, found in adults, may dramatically alter treatment.
For example, he noted that if there is a gene mutation related to mTOR pathways, that could provide a future target because there are already medications that target this pathway.
Genetic testing may also be useful in cases where patients have normal brain imaging and poor response to standard treatment or in cases where patients have congenital abnormalities such as intellectual impairment or facial dysmorphic features and a co-morbid seizure disorder, he said.
Dr. Singh noted that he has often found genetic testing impractical because “if I order DNA testing right now, it will take 4 months for me to get the results. I cannot wait 4 months for the results to come back” to adjust treatment.
Dr. McKnight is an employee of and a shareholder in Invitae, which funded the study. Dr. Singh has disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
From WCN 2021
Adolescents who exercised after a concussion recovered faster in RCT
After a concussion, resuming aerobic exercise relatively early on – at an intensity that does not worsen symptoms – may help young athletes recover sooner, compared with stretching, a randomized controlled trial (RCT) shows.
The study adds to emerging evidence that clinicians should prescribe exercise, rather than strict rest, to facilitate concussion recovery, researchers said.
Tamara McLeod, PhD, ATC, professor and director of athletic training programs at A.T. Still University in Mesa, Ariz., hopes the findings help clinicians see that “this is an approach that should be taken.”
“Too often with concussion, patients are given a laundry list of things they are NOT allowed to do,” including sports, school, and social activities, said Dr. McLeod, who was not involved in the study.
The research, published in The Lancet Child & Adolescent Health, largely replicates the findings of a prior trial while addressing limitations of the previous study’s design, researchers said.
For the trial, John J. Leddy, MD, with the State University of New York at Buffalo and colleagues recruited 118 male and female adolescent athletes aged 13-18 years who had had a sport-related concussion in the past 10 days. Investigators at three community and hospital-affiliated sports medicine concussion centers in the United States randomly assigned the athletes to individualized subsymptom-threshold aerobic exercise (61 participants) or stretching exercise (57 participants) at least 20 minutes per day for up to 4 weeks. Aerobic exercise included walking, jogging, or stationary cycling at home.
“It is important that the general clinician community appreciates that prolonged rest and avoidance of physical activity until spontaneous symptom resolution is no longer an acceptable approach to caring for adolescents with concussion,” Dr. Leddy and coauthors said.
The investigators improved on the “the scientific rigor of their previous RCT by including intention-to-treat and per-protocol analyses, daily symptom reporting, objective exercise adherence measurements, and greater heterogeneity of concussion severity,” said Carolyn A. Emery, PhD, and Jonathan Smirl, PhD, both with the University of Calgary (Alta.), in a related commentary. The new study is the first to show that early targeted heart rate subsymptom-threshold aerobic exercise, relative to stretching, shortened recovery time within 4 weeks after sport-related concussion (hazard ratio, 0.52) when controlling for sex, study site, and average daily exercise time, Dr. Emery and Dr. Smirl said.
A larger proportion of athletes assigned to stretching did not recover by 4 weeks, compared with those assigned to aerobic exercise (32% vs. 21%). The median time to full recovery was longer for the stretching group than for the aerobic exercise group (19 days vs. 14 days).
Among athletes who adhered to their assigned regimens, the differences were more pronounced: The median recovery time was 21 days for the stretching group, compared with 12 days for the aerobic exercise group. The rate of postconcussion symptoms beyond 28 days was 9% in the aerobic exercise group versus 31% in the stretching group, among adherent participants.
More research is needed to establish the efficacy of postconcussion aerobic exercise in adults and for nonsport injury, the researchers noted. Possible mechanisms underlying aerobic exercise’s benefits could include increased parasympathetic autonomic tone, improved cerebral blood flow regulation, or enhanced neuron repair, they suggested.
The right amount and timing of exercise, and doing so at an intensity that does not exacerbate symptoms, may be key. Other research has suggested that too much exercise, too soon may delay recovery, Dr. Emery said in an interview. “But there is now a lot of evidence to support low and moderate levels of physical activity to expedite recovery,” she said.
The study was funded by the American Medical Society for Sports Medicine. The study and commentary authors and Dr. McLeod had no disclosures.
After a concussion, resuming aerobic exercise relatively early on – at an intensity that does not worsen symptoms – may help young athletes recover sooner, compared with stretching, a randomized controlled trial (RCT) shows.
The study adds to emerging evidence that clinicians should prescribe exercise, rather than strict rest, to facilitate concussion recovery, researchers said.
Tamara McLeod, PhD, ATC, professor and director of athletic training programs at A.T. Still University in Mesa, Ariz., hopes the findings help clinicians see that “this is an approach that should be taken.”
“Too often with concussion, patients are given a laundry list of things they are NOT allowed to do,” including sports, school, and social activities, said Dr. McLeod, who was not involved in the study.
The research, published in The Lancet Child & Adolescent Health, largely replicates the findings of a prior trial while addressing limitations of the previous study’s design, researchers said.
For the trial, John J. Leddy, MD, with the State University of New York at Buffalo and colleagues recruited 118 male and female adolescent athletes aged 13-18 years who had had a sport-related concussion in the past 10 days. Investigators at three community and hospital-affiliated sports medicine concussion centers in the United States randomly assigned the athletes to individualized subsymptom-threshold aerobic exercise (61 participants) or stretching exercise (57 participants) at least 20 minutes per day for up to 4 weeks. Aerobic exercise included walking, jogging, or stationary cycling at home.
“It is important that the general clinician community appreciates that prolonged rest and avoidance of physical activity until spontaneous symptom resolution is no longer an acceptable approach to caring for adolescents with concussion,” Dr. Leddy and coauthors said.
The investigators improved on the “the scientific rigor of their previous RCT by including intention-to-treat and per-protocol analyses, daily symptom reporting, objective exercise adherence measurements, and greater heterogeneity of concussion severity,” said Carolyn A. Emery, PhD, and Jonathan Smirl, PhD, both with the University of Calgary (Alta.), in a related commentary. The new study is the first to show that early targeted heart rate subsymptom-threshold aerobic exercise, relative to stretching, shortened recovery time within 4 weeks after sport-related concussion (hazard ratio, 0.52) when controlling for sex, study site, and average daily exercise time, Dr. Emery and Dr. Smirl said.
A larger proportion of athletes assigned to stretching did not recover by 4 weeks, compared with those assigned to aerobic exercise (32% vs. 21%). The median time to full recovery was longer for the stretching group than for the aerobic exercise group (19 days vs. 14 days).
Among athletes who adhered to their assigned regimens, the differences were more pronounced: The median recovery time was 21 days for the stretching group, compared with 12 days for the aerobic exercise group. The rate of postconcussion symptoms beyond 28 days was 9% in the aerobic exercise group versus 31% in the stretching group, among adherent participants.
More research is needed to establish the efficacy of postconcussion aerobic exercise in adults and for nonsport injury, the researchers noted. Possible mechanisms underlying aerobic exercise’s benefits could include increased parasympathetic autonomic tone, improved cerebral blood flow regulation, or enhanced neuron repair, they suggested.
The right amount and timing of exercise, and doing so at an intensity that does not exacerbate symptoms, may be key. Other research has suggested that too much exercise, too soon may delay recovery, Dr. Emery said in an interview. “But there is now a lot of evidence to support low and moderate levels of physical activity to expedite recovery,” she said.
The study was funded by the American Medical Society for Sports Medicine. The study and commentary authors and Dr. McLeod had no disclosures.
After a concussion, resuming aerobic exercise relatively early on – at an intensity that does not worsen symptoms – may help young athletes recover sooner, compared with stretching, a randomized controlled trial (RCT) shows.
The study adds to emerging evidence that clinicians should prescribe exercise, rather than strict rest, to facilitate concussion recovery, researchers said.
Tamara McLeod, PhD, ATC, professor and director of athletic training programs at A.T. Still University in Mesa, Ariz., hopes the findings help clinicians see that “this is an approach that should be taken.”
“Too often with concussion, patients are given a laundry list of things they are NOT allowed to do,” including sports, school, and social activities, said Dr. McLeod, who was not involved in the study.
The research, published in The Lancet Child & Adolescent Health, largely replicates the findings of a prior trial while addressing limitations of the previous study’s design, researchers said.
For the trial, John J. Leddy, MD, with the State University of New York at Buffalo and colleagues recruited 118 male and female adolescent athletes aged 13-18 years who had had a sport-related concussion in the past 10 days. Investigators at three community and hospital-affiliated sports medicine concussion centers in the United States randomly assigned the athletes to individualized subsymptom-threshold aerobic exercise (61 participants) or stretching exercise (57 participants) at least 20 minutes per day for up to 4 weeks. Aerobic exercise included walking, jogging, or stationary cycling at home.
“It is important that the general clinician community appreciates that prolonged rest and avoidance of physical activity until spontaneous symptom resolution is no longer an acceptable approach to caring for adolescents with concussion,” Dr. Leddy and coauthors said.
The investigators improved on the “the scientific rigor of their previous RCT by including intention-to-treat and per-protocol analyses, daily symptom reporting, objective exercise adherence measurements, and greater heterogeneity of concussion severity,” said Carolyn A. Emery, PhD, and Jonathan Smirl, PhD, both with the University of Calgary (Alta.), in a related commentary. The new study is the first to show that early targeted heart rate subsymptom-threshold aerobic exercise, relative to stretching, shortened recovery time within 4 weeks after sport-related concussion (hazard ratio, 0.52) when controlling for sex, study site, and average daily exercise time, Dr. Emery and Dr. Smirl said.
A larger proportion of athletes assigned to stretching did not recover by 4 weeks, compared with those assigned to aerobic exercise (32% vs. 21%). The median time to full recovery was longer for the stretching group than for the aerobic exercise group (19 days vs. 14 days).
Among athletes who adhered to their assigned regimens, the differences were more pronounced: The median recovery time was 21 days for the stretching group, compared with 12 days for the aerobic exercise group. The rate of postconcussion symptoms beyond 28 days was 9% in the aerobic exercise group versus 31% in the stretching group, among adherent participants.
More research is needed to establish the efficacy of postconcussion aerobic exercise in adults and for nonsport injury, the researchers noted. Possible mechanisms underlying aerobic exercise’s benefits could include increased parasympathetic autonomic tone, improved cerebral blood flow regulation, or enhanced neuron repair, they suggested.
The right amount and timing of exercise, and doing so at an intensity that does not exacerbate symptoms, may be key. Other research has suggested that too much exercise, too soon may delay recovery, Dr. Emery said in an interview. “But there is now a lot of evidence to support low and moderate levels of physical activity to expedite recovery,” she said.
The study was funded by the American Medical Society for Sports Medicine. The study and commentary authors and Dr. McLeod had no disclosures.
FROM THE LANCET CHILD & ADOLESCENT HEALTH
Cement found in man’s heart after spinal surgery
, according to a new report published in the New England Journal of Medicine.
The 56-year-old man, who was not identified in the report, went to the emergency room after experiencing 2 days of chest pain and shortness of breath. Imaging scans showed that the chest pain was caused by a foreign object, and he was rushed to surgery.
Surgeons then located and removed a thin, sharp, cylindrical piece of cement and repaired the damage to the patient’s heart. The cement had pierced the upper right chamber of his heart and his right lung, according to the report authors from the Yale University School of Medicine.
A week before, the man had undergone a spinal surgery known as kyphoplasty. The procedure treats spine injuries by injecting a special type of medical cement into damaged vertebrae, according to USA Today. The cement had leaked into the patient’s body, hardened, and traveled to his heart.
The man has now “nearly recovered” since the heart surgery and cement removal, which occurred about a month ago, the journal report stated. He experienced no additional complications.
Cement leakage after kyphoplasty can happen but is an extremely rare complication. Less than 2% of patients who undergo the procedure for osteoporosis or brittle bones have complications, according to patient information from the American Association of Neurological Surgeons.
A version of this article first appeared on WebMD.com.
, according to a new report published in the New England Journal of Medicine.
The 56-year-old man, who was not identified in the report, went to the emergency room after experiencing 2 days of chest pain and shortness of breath. Imaging scans showed that the chest pain was caused by a foreign object, and he was rushed to surgery.
Surgeons then located and removed a thin, sharp, cylindrical piece of cement and repaired the damage to the patient’s heart. The cement had pierced the upper right chamber of his heart and his right lung, according to the report authors from the Yale University School of Medicine.
A week before, the man had undergone a spinal surgery known as kyphoplasty. The procedure treats spine injuries by injecting a special type of medical cement into damaged vertebrae, according to USA Today. The cement had leaked into the patient’s body, hardened, and traveled to his heart.
The man has now “nearly recovered” since the heart surgery and cement removal, which occurred about a month ago, the journal report stated. He experienced no additional complications.
Cement leakage after kyphoplasty can happen but is an extremely rare complication. Less than 2% of patients who undergo the procedure for osteoporosis or brittle bones have complications, according to patient information from the American Association of Neurological Surgeons.
A version of this article first appeared on WebMD.com.
, according to a new report published in the New England Journal of Medicine.
The 56-year-old man, who was not identified in the report, went to the emergency room after experiencing 2 days of chest pain and shortness of breath. Imaging scans showed that the chest pain was caused by a foreign object, and he was rushed to surgery.
Surgeons then located and removed a thin, sharp, cylindrical piece of cement and repaired the damage to the patient’s heart. The cement had pierced the upper right chamber of his heart and his right lung, according to the report authors from the Yale University School of Medicine.
A week before, the man had undergone a spinal surgery known as kyphoplasty. The procedure treats spine injuries by injecting a special type of medical cement into damaged vertebrae, according to USA Today. The cement had leaked into the patient’s body, hardened, and traveled to his heart.
The man has now “nearly recovered” since the heart surgery and cement removal, which occurred about a month ago, the journal report stated. He experienced no additional complications.
Cement leakage after kyphoplasty can happen but is an extremely rare complication. Less than 2% of patients who undergo the procedure for osteoporosis or brittle bones have complications, according to patient information from the American Association of Neurological Surgeons.
A version of this article first appeared on WebMD.com.
Constipation med boosts cognitive performance in mental illness
, new research suggests.
In a randomized controlled trial, 44 healthy individuals were assigned to receive the selective serotonin-4 (5-HT4) receptor agonist prucalopride (Motegrity) or placebo for 1 week.
After 6 days, the active-treatment group performed significantly better on memory tests than the participants who received placebo. In addition, the drug increased activity in brain areas related to cognition.
“What we’re hoping is...these agents may be able to help those with cognitive impairment as part of their mental illness,” lead author Angharad N. de Cates, a clinical DPhil student in the department of psychiatry, University of Oxford, Oxford, United Kingdom, told meeting attendees.
“Currently, we’re looking to see if we can translate our finding a step further and do a similar study in those with depression,” Ms. de Cates added.
The findings were presented at the 34th European College of Neuropsychopharmacology (ECNP) Congress and were simultaneously published in Translational Psychiatry.
“Exciting early evidence”
“Even when the low mood associated with depression is well-treated with conventional antidepressants, many patients continue to experience problems with their memory,” co-investigator Susannah Murphy, PhD, a senior research fellow at the University of Oxford, said in a release.
“Our study provides exciting early evidence in humans of a new approach that might be a helpful way to treat these residual cognitive symptoms,” Dr. Murphy added.
Preclinical and animal studies suggest that the 5-HT4 receptor is a promising treatment target for cognitive impairment in individuals with psychiatric disorders, although studies in humans have been limited by the adverse effects of early agents.
“We’ve had our eye on this receptor for a while,” explained de Cates, inasmuch as the animal data “have been so good.”
However, she said in an interview that “a lack of safe human agents made translation tricky.”
As previously reported, prucalopride, a selective high-affinity 5-HT4 partial agonist, was approved in 2018 by the U.S. Food and Drug Administration for the treatment of chronic idiopathic constipation.
The current researchers note that the drug has “good brain penetration,” which “allowed us to investigate 5-HT4-receptor agonism in humans.”
Having previously shown that a single dose of the drug has “pro-cognitive effects,” the investigators conducted the new trial in 44 healthy participants. All were randomly assigned in a 1:1 ratio to receive either prucalopride 1 mg for 7 days or placebo.
In accordance with enrollment criteria, patients were 18 to 36 years of age, right-handed, and were not pregnant or breastfeeding. Participants’ body mass index was 18 to 30 kg/m2, and they had no contraindications to the study drug. The two treatment groups were well balanced; the participants who received placebo were significantly more likely to be nonnative English speakers (P = .02).
On day 6 of treatment administration, all participants underwent 3T MRI.
Before undergoing imaging, the participants were presented with eight emotionally neutral images of animals or landscapes and were asked to indicate whether or not the images were of animals. The task was then repeated with the eight familiar images and eight novel ones.
During the scan, participants were shown the same images or eight novel images and were again asked whether or not the images contained an animal. They were also instructed to try to remember the images for a subsequent memory task. In that task, the eight original images, 48 novel images, and 27 “distractor” images were presented.
Better memory
In the pre-scan assessment, results showed no significant differences in the ability of members of the prucalopride and placebo groups to identify images as being familiar or different.
However, taking prucalopride was associated with significantly improved memory performance in the post-scan recall task.
Compared to the placebo group, participants in the prucalopride group were more accurate in selecting images as familiar vs distractors (P = .029) and in distinguishing images as familiar, novel, or distractors (P = .035).
Functional MRI revealed increased activity in the left and right hippocampus in response to both novel and familiar images among the participants in the prucalopride group in comparison with those in the placebo group.
There was also increased activity in the right angular gyrus in the prucalopride group in comparison with the placebo group in response to familiar images (P < .005).
“Clinically, angular gyri lesions cause language dysfunction, low mood, and poor memory and can mimic dementia or pseudodementia,” the investigators write. They note that the right angular gyrus “shows significantly decreased activity” in mild cognitive impairment.
“Therefore, the increased activity seen in the right angular gyrus following prucalopride administration in our study is consistent with the pro-cognitive behavioural effects we observed,” they add.
Ms. De Cates noted that the dose used in their study was lower than the 2 mg given for constipation.
“At the low dose, there were no differences in side effects between groups and no withdrawals from the prucalopride group for side effects. We are going to try increasing the dose in our next study actually, as we don’t have PET data to tell us what the optimal dose for binding at the receptor should be,” said Ms. de Cates.
“In safety studies, the dose was trialled in healthy volunteers at 4 mg, which was found to be safe, although perhaps less well tolerated than 2 mg,” she said.
Generalizable findings?
Commenting on the research, Vibe G. Frøkjær, MD, adjunct professor, department of psychology, Copenhagen University, Denmark, said the study “highlights a very interesting and much needed potential for repurposing drugs to help cognitive dysfunction.”
He noted that cognitive dysfunction is often associated with psychiatric disorders -- even in states of remission.
“Importantly, as the authors also state, it will be vital to translate these findings from healthy populations into clinical populations,” said Dr. Frøkjær, who was not involved in the research.
“It will also be important to understand if prucalopride adds to the effects of existing antidepressant treatments or can be used as a stand-alone therapy,” he added.
The study was funded by the NIHR Oxford Health Biomedical Research Center and by the Wellcome Center for Integrative Neuroscience. Ms. De Cates has received a travel grant from the Royal College of Psychiatrists/Gatsby Foundation and support from Wellcome. The other authors have relationships with P1vital Ltd, Janssen Pharmaceuticals, Sage Therapeutics, Pfizer, Zogenix, Compass Pathways, and Lundbeck.
A version of this article first appeared on Medscape.com.
, new research suggests.
In a randomized controlled trial, 44 healthy individuals were assigned to receive the selective serotonin-4 (5-HT4) receptor agonist prucalopride (Motegrity) or placebo for 1 week.
After 6 days, the active-treatment group performed significantly better on memory tests than the participants who received placebo. In addition, the drug increased activity in brain areas related to cognition.
“What we’re hoping is...these agents may be able to help those with cognitive impairment as part of their mental illness,” lead author Angharad N. de Cates, a clinical DPhil student in the department of psychiatry, University of Oxford, Oxford, United Kingdom, told meeting attendees.
“Currently, we’re looking to see if we can translate our finding a step further and do a similar study in those with depression,” Ms. de Cates added.
The findings were presented at the 34th European College of Neuropsychopharmacology (ECNP) Congress and were simultaneously published in Translational Psychiatry.
“Exciting early evidence”
“Even when the low mood associated with depression is well-treated with conventional antidepressants, many patients continue to experience problems with their memory,” co-investigator Susannah Murphy, PhD, a senior research fellow at the University of Oxford, said in a release.
“Our study provides exciting early evidence in humans of a new approach that might be a helpful way to treat these residual cognitive symptoms,” Dr. Murphy added.
Preclinical and animal studies suggest that the 5-HT4 receptor is a promising treatment target for cognitive impairment in individuals with psychiatric disorders, although studies in humans have been limited by the adverse effects of early agents.
“We’ve had our eye on this receptor for a while,” explained de Cates, inasmuch as the animal data “have been so good.”
However, she said in an interview that “a lack of safe human agents made translation tricky.”
As previously reported, prucalopride, a selective high-affinity 5-HT4 partial agonist, was approved in 2018 by the U.S. Food and Drug Administration for the treatment of chronic idiopathic constipation.
The current researchers note that the drug has “good brain penetration,” which “allowed us to investigate 5-HT4-receptor agonism in humans.”
Having previously shown that a single dose of the drug has “pro-cognitive effects,” the investigators conducted the new trial in 44 healthy participants. All were randomly assigned in a 1:1 ratio to receive either prucalopride 1 mg for 7 days or placebo.
In accordance with enrollment criteria, patients were 18 to 36 years of age, right-handed, and were not pregnant or breastfeeding. Participants’ body mass index was 18 to 30 kg/m2, and they had no contraindications to the study drug. The two treatment groups were well balanced; the participants who received placebo were significantly more likely to be nonnative English speakers (P = .02).
On day 6 of treatment administration, all participants underwent 3T MRI.
Before undergoing imaging, the participants were presented with eight emotionally neutral images of animals or landscapes and were asked to indicate whether or not the images were of animals. The task was then repeated with the eight familiar images and eight novel ones.
During the scan, participants were shown the same images or eight novel images and were again asked whether or not the images contained an animal. They were also instructed to try to remember the images for a subsequent memory task. In that task, the eight original images, 48 novel images, and 27 “distractor” images were presented.
Better memory
In the pre-scan assessment, results showed no significant differences in the ability of members of the prucalopride and placebo groups to identify images as being familiar or different.
However, taking prucalopride was associated with significantly improved memory performance in the post-scan recall task.
Compared to the placebo group, participants in the prucalopride group were more accurate in selecting images as familiar vs distractors (P = .029) and in distinguishing images as familiar, novel, or distractors (P = .035).
Functional MRI revealed increased activity in the left and right hippocampus in response to both novel and familiar images among the participants in the prucalopride group in comparison with those in the placebo group.
There was also increased activity in the right angular gyrus in the prucalopride group in comparison with the placebo group in response to familiar images (P < .005).
“Clinically, angular gyri lesions cause language dysfunction, low mood, and poor memory and can mimic dementia or pseudodementia,” the investigators write. They note that the right angular gyrus “shows significantly decreased activity” in mild cognitive impairment.
“Therefore, the increased activity seen in the right angular gyrus following prucalopride administration in our study is consistent with the pro-cognitive behavioural effects we observed,” they add.
Ms. De Cates noted that the dose used in their study was lower than the 2 mg given for constipation.
“At the low dose, there were no differences in side effects between groups and no withdrawals from the prucalopride group for side effects. We are going to try increasing the dose in our next study actually, as we don’t have PET data to tell us what the optimal dose for binding at the receptor should be,” said Ms. de Cates.
“In safety studies, the dose was trialled in healthy volunteers at 4 mg, which was found to be safe, although perhaps less well tolerated than 2 mg,” she said.
Generalizable findings?
Commenting on the research, Vibe G. Frøkjær, MD, adjunct professor, department of psychology, Copenhagen University, Denmark, said the study “highlights a very interesting and much needed potential for repurposing drugs to help cognitive dysfunction.”
He noted that cognitive dysfunction is often associated with psychiatric disorders -- even in states of remission.
“Importantly, as the authors also state, it will be vital to translate these findings from healthy populations into clinical populations,” said Dr. Frøkjær, who was not involved in the research.
“It will also be important to understand if prucalopride adds to the effects of existing antidepressant treatments or can be used as a stand-alone therapy,” he added.
The study was funded by the NIHR Oxford Health Biomedical Research Center and by the Wellcome Center for Integrative Neuroscience. Ms. De Cates has received a travel grant from the Royal College of Psychiatrists/Gatsby Foundation and support from Wellcome. The other authors have relationships with P1vital Ltd, Janssen Pharmaceuticals, Sage Therapeutics, Pfizer, Zogenix, Compass Pathways, and Lundbeck.
A version of this article first appeared on Medscape.com.
, new research suggests.
In a randomized controlled trial, 44 healthy individuals were assigned to receive the selective serotonin-4 (5-HT4) receptor agonist prucalopride (Motegrity) or placebo for 1 week.
After 6 days, the active-treatment group performed significantly better on memory tests than the participants who received placebo. In addition, the drug increased activity in brain areas related to cognition.
“What we’re hoping is...these agents may be able to help those with cognitive impairment as part of their mental illness,” lead author Angharad N. de Cates, a clinical DPhil student in the department of psychiatry, University of Oxford, Oxford, United Kingdom, told meeting attendees.
“Currently, we’re looking to see if we can translate our finding a step further and do a similar study in those with depression,” Ms. de Cates added.
The findings were presented at the 34th European College of Neuropsychopharmacology (ECNP) Congress and were simultaneously published in Translational Psychiatry.
“Exciting early evidence”
“Even when the low mood associated with depression is well-treated with conventional antidepressants, many patients continue to experience problems with their memory,” co-investigator Susannah Murphy, PhD, a senior research fellow at the University of Oxford, said in a release.
“Our study provides exciting early evidence in humans of a new approach that might be a helpful way to treat these residual cognitive symptoms,” Dr. Murphy added.
Preclinical and animal studies suggest that the 5-HT4 receptor is a promising treatment target for cognitive impairment in individuals with psychiatric disorders, although studies in humans have been limited by the adverse effects of early agents.
“We’ve had our eye on this receptor for a while,” explained de Cates, inasmuch as the animal data “have been so good.”
However, she said in an interview that “a lack of safe human agents made translation tricky.”
As previously reported, prucalopride, a selective high-affinity 5-HT4 partial agonist, was approved in 2018 by the U.S. Food and Drug Administration for the treatment of chronic idiopathic constipation.
The current researchers note that the drug has “good brain penetration,” which “allowed us to investigate 5-HT4-receptor agonism in humans.”
Having previously shown that a single dose of the drug has “pro-cognitive effects,” the investigators conducted the new trial in 44 healthy participants. All were randomly assigned in a 1:1 ratio to receive either prucalopride 1 mg for 7 days or placebo.
In accordance with enrollment criteria, patients were 18 to 36 years of age, right-handed, and were not pregnant or breastfeeding. Participants’ body mass index was 18 to 30 kg/m2, and they had no contraindications to the study drug. The two treatment groups were well balanced; the participants who received placebo were significantly more likely to be nonnative English speakers (P = .02).
On day 6 of treatment administration, all participants underwent 3T MRI.
Before undergoing imaging, the participants were presented with eight emotionally neutral images of animals or landscapes and were asked to indicate whether or not the images were of animals. The task was then repeated with the eight familiar images and eight novel ones.
During the scan, participants were shown the same images or eight novel images and were again asked whether or not the images contained an animal. They were also instructed to try to remember the images for a subsequent memory task. In that task, the eight original images, 48 novel images, and 27 “distractor” images were presented.
Better memory
In the pre-scan assessment, results showed no significant differences in the ability of members of the prucalopride and placebo groups to identify images as being familiar or different.
However, taking prucalopride was associated with significantly improved memory performance in the post-scan recall task.
Compared to the placebo group, participants in the prucalopride group were more accurate in selecting images as familiar vs distractors (P = .029) and in distinguishing images as familiar, novel, or distractors (P = .035).
Functional MRI revealed increased activity in the left and right hippocampus in response to both novel and familiar images among the participants in the prucalopride group in comparison with those in the placebo group.
There was also increased activity in the right angular gyrus in the prucalopride group in comparison with the placebo group in response to familiar images (P < .005).
“Clinically, angular gyri lesions cause language dysfunction, low mood, and poor memory and can mimic dementia or pseudodementia,” the investigators write. They note that the right angular gyrus “shows significantly decreased activity” in mild cognitive impairment.
“Therefore, the increased activity seen in the right angular gyrus following prucalopride administration in our study is consistent with the pro-cognitive behavioural effects we observed,” they add.
Ms. De Cates noted that the dose used in their study was lower than the 2 mg given for constipation.
“At the low dose, there were no differences in side effects between groups and no withdrawals from the prucalopride group for side effects. We are going to try increasing the dose in our next study actually, as we don’t have PET data to tell us what the optimal dose for binding at the receptor should be,” said Ms. de Cates.
“In safety studies, the dose was trialled in healthy volunteers at 4 mg, which was found to be safe, although perhaps less well tolerated than 2 mg,” she said.
Generalizable findings?
Commenting on the research, Vibe G. Frøkjær, MD, adjunct professor, department of psychology, Copenhagen University, Denmark, said the study “highlights a very interesting and much needed potential for repurposing drugs to help cognitive dysfunction.”
He noted that cognitive dysfunction is often associated with psychiatric disorders -- even in states of remission.
“Importantly, as the authors also state, it will be vital to translate these findings from healthy populations into clinical populations,” said Dr. Frøkjær, who was not involved in the research.
“It will also be important to understand if prucalopride adds to the effects of existing antidepressant treatments or can be used as a stand-alone therapy,” he added.
The study was funded by the NIHR Oxford Health Biomedical Research Center and by the Wellcome Center for Integrative Neuroscience. Ms. De Cates has received a travel grant from the Royal College of Psychiatrists/Gatsby Foundation and support from Wellcome. The other authors have relationships with P1vital Ltd, Janssen Pharmaceuticals, Sage Therapeutics, Pfizer, Zogenix, Compass Pathways, and Lundbeck.
A version of this article first appeared on Medscape.com.
Case reports underscore risk of cerebral edema, AFCE in children with COVID-19
according to pediatric neurologists who are urging colleagues to watch out for similar cases.
At least one other child in the United States has died after becoming infected with the virus and developing cerebral edema. “The rapid and devastating clinical course in both of these cases highlights the need for early recognition of a cerebral edema and AFCE as potential complications of COVID-19 in pediatric patients,” the neurologists wrote.
The case was highlighted in a poster presented at the annual meeting of the Child Neurology Society and in a report published earlier this year in Child Neurology Open.
According to pediatric neurologist Timothy Gershon, MD, PhD , of the University of North Carolina at Chapel Hill, the child appeared in clinic in July 2020. She had been healthy but was suffering from 1 day of fever, seizure-like activity (generalized convulsions and drooling), anorexia, and lethargy.
The girl, who was subsequently diagnosed with COVID-19, deteriorated in the hospital. “She received IV dexamethasone in attempts to reduce cerebral edema,” the neurologists wrote. “Regarding immunomodulatory therapy, she received intravenous immunoglobulin (2 g/kg), anakinra, and hydrocortisone; despite approval for remdesivir and COVID-19 convalescent plasma, these were ultimately withheld due to poor prognosis.”
Brain death examinations at 24 and 48 hours after cardiac arrest were consistent with brain death, they reported.
Neurologists believe the patient suffered from AFCE, “an often fatal pediatric clinical entity consisting of fever, encephalopathy, and new-onset seizures followed by rapid, diffuse, and medically-refractory cerebral edema.” They add that “AFCE occurs as a rare complication of a variety of common pediatric infections, and a CNS [central nervous system] pathogen is identified in only a minority of cases, suggesting a para-infectious mechanism of edema.”
Neurologists offered a case definition of the “recently recognized” AFCE earlier this year.
“This was an extremely rare rapid progression to cerebral edema. I think it was related to the patient’s COVID infection, but why this patient got it and others don’t is unknown,” Dr. Gershon said in an interview. “The full spectrum of neurological complications of COVID were not yet known [at the time]. We didn’t know, and still don’t know, what the causative links are between COVID and suddenly having seizures and brain swelling.”
He said he’d treat a similar patient differently now and give dexamethasone earlier in the clinical course, although “there is no data to tell us if any therapy could have reversed it.” Specifically, he said, “I’d give dexamethasone at the first sign of brain involvement, using the dosing recommended for cerebral edema, and try to get the MRI earlier in the course.”
Dr. Gershon and colleagues noted another case of fatal cerebral edema in a child, a 7-year-old boy who was treated in New York state. That case “shows that fatal cerebral edema may complicate pediatric multisystem inflammatory syndrome,” they wrote.
Pediatric critical care specialist Preetha Krishnan, MD, of Randall Children’s Hospital at Legacy Emanuel in Portland, Ore., helped develop the new definition of AFCE. In an interview, she said AFCE is difficult to diagnose because the signs/symptoms – such as fever, altered sensorium, and seizures – are found in other conditions such as febrile status epilepticus with a viral illness.
“The key to recognition of AFCE is that unlike other disease processes, these children have rapid neurologic progression,” she said. “In addition, many of our AFCE patients also had vomiting and/or headache, which in retrospect was likely an indication of elevated ICP [intracranial pressure] rather than viral infection.”
She added that “if a child with fever, seizures, and encephalopathy has cerebral edema on imaging and/or has neurologic progression, AFCE should be considered. Most of our cases of AFCE had fulminant progression within the first 3 days of their head imaging noting cerebral edema. There are other neurologic diseases, such as acute necrotizing encephalopathy of childhood, that also have progressive signs/symptoms, but head imaging and lab work should help differentiate many of these etiologies.”
In regard to treatment, she said, “our unit would likely err on the side of providing as much neuroprotective measures as is reasonable, such as maintaining normothermia, consideration of hyperosmolar therapy, maintaining normocarbia and normoxemia, managing seizures, etc. I would recommend getting the entire neurocritical care team involved in the management discussion. This varies by center, but will likely include neurology, ID [infectious disease], possibly neurosurgery, and PICU.”
As for the new case report, Krishnan said COVID-19 has been linked to neurologic complications, “so it does not surprise me that AFCE is part of the neurologic spectrum of disease.”
No funding was reported, and the authors report no relevant disclosures. Dr. Krishnan has no disclosures.
according to pediatric neurologists who are urging colleagues to watch out for similar cases.
At least one other child in the United States has died after becoming infected with the virus and developing cerebral edema. “The rapid and devastating clinical course in both of these cases highlights the need for early recognition of a cerebral edema and AFCE as potential complications of COVID-19 in pediatric patients,” the neurologists wrote.
The case was highlighted in a poster presented at the annual meeting of the Child Neurology Society and in a report published earlier this year in Child Neurology Open.
According to pediatric neurologist Timothy Gershon, MD, PhD , of the University of North Carolina at Chapel Hill, the child appeared in clinic in July 2020. She had been healthy but was suffering from 1 day of fever, seizure-like activity (generalized convulsions and drooling), anorexia, and lethargy.
The girl, who was subsequently diagnosed with COVID-19, deteriorated in the hospital. “She received IV dexamethasone in attempts to reduce cerebral edema,” the neurologists wrote. “Regarding immunomodulatory therapy, she received intravenous immunoglobulin (2 g/kg), anakinra, and hydrocortisone; despite approval for remdesivir and COVID-19 convalescent plasma, these were ultimately withheld due to poor prognosis.”
Brain death examinations at 24 and 48 hours after cardiac arrest were consistent with brain death, they reported.
Neurologists believe the patient suffered from AFCE, “an often fatal pediatric clinical entity consisting of fever, encephalopathy, and new-onset seizures followed by rapid, diffuse, and medically-refractory cerebral edema.” They add that “AFCE occurs as a rare complication of a variety of common pediatric infections, and a CNS [central nervous system] pathogen is identified in only a minority of cases, suggesting a para-infectious mechanism of edema.”
Neurologists offered a case definition of the “recently recognized” AFCE earlier this year.
“This was an extremely rare rapid progression to cerebral edema. I think it was related to the patient’s COVID infection, but why this patient got it and others don’t is unknown,” Dr. Gershon said in an interview. “The full spectrum of neurological complications of COVID were not yet known [at the time]. We didn’t know, and still don’t know, what the causative links are between COVID and suddenly having seizures and brain swelling.”
He said he’d treat a similar patient differently now and give dexamethasone earlier in the clinical course, although “there is no data to tell us if any therapy could have reversed it.” Specifically, he said, “I’d give dexamethasone at the first sign of brain involvement, using the dosing recommended for cerebral edema, and try to get the MRI earlier in the course.”
Dr. Gershon and colleagues noted another case of fatal cerebral edema in a child, a 7-year-old boy who was treated in New York state. That case “shows that fatal cerebral edema may complicate pediatric multisystem inflammatory syndrome,” they wrote.
Pediatric critical care specialist Preetha Krishnan, MD, of Randall Children’s Hospital at Legacy Emanuel in Portland, Ore., helped develop the new definition of AFCE. In an interview, she said AFCE is difficult to diagnose because the signs/symptoms – such as fever, altered sensorium, and seizures – are found in other conditions such as febrile status epilepticus with a viral illness.
“The key to recognition of AFCE is that unlike other disease processes, these children have rapid neurologic progression,” she said. “In addition, many of our AFCE patients also had vomiting and/or headache, which in retrospect was likely an indication of elevated ICP [intracranial pressure] rather than viral infection.”
She added that “if a child with fever, seizures, and encephalopathy has cerebral edema on imaging and/or has neurologic progression, AFCE should be considered. Most of our cases of AFCE had fulminant progression within the first 3 days of their head imaging noting cerebral edema. There are other neurologic diseases, such as acute necrotizing encephalopathy of childhood, that also have progressive signs/symptoms, but head imaging and lab work should help differentiate many of these etiologies.”
In regard to treatment, she said, “our unit would likely err on the side of providing as much neuroprotective measures as is reasonable, such as maintaining normothermia, consideration of hyperosmolar therapy, maintaining normocarbia and normoxemia, managing seizures, etc. I would recommend getting the entire neurocritical care team involved in the management discussion. This varies by center, but will likely include neurology, ID [infectious disease], possibly neurosurgery, and PICU.”
As for the new case report, Krishnan said COVID-19 has been linked to neurologic complications, “so it does not surprise me that AFCE is part of the neurologic spectrum of disease.”
No funding was reported, and the authors report no relevant disclosures. Dr. Krishnan has no disclosures.
according to pediatric neurologists who are urging colleagues to watch out for similar cases.
At least one other child in the United States has died after becoming infected with the virus and developing cerebral edema. “The rapid and devastating clinical course in both of these cases highlights the need for early recognition of a cerebral edema and AFCE as potential complications of COVID-19 in pediatric patients,” the neurologists wrote.
The case was highlighted in a poster presented at the annual meeting of the Child Neurology Society and in a report published earlier this year in Child Neurology Open.
According to pediatric neurologist Timothy Gershon, MD, PhD , of the University of North Carolina at Chapel Hill, the child appeared in clinic in July 2020. She had been healthy but was suffering from 1 day of fever, seizure-like activity (generalized convulsions and drooling), anorexia, and lethargy.
The girl, who was subsequently diagnosed with COVID-19, deteriorated in the hospital. “She received IV dexamethasone in attempts to reduce cerebral edema,” the neurologists wrote. “Regarding immunomodulatory therapy, she received intravenous immunoglobulin (2 g/kg), anakinra, and hydrocortisone; despite approval for remdesivir and COVID-19 convalescent plasma, these were ultimately withheld due to poor prognosis.”
Brain death examinations at 24 and 48 hours after cardiac arrest were consistent with brain death, they reported.
Neurologists believe the patient suffered from AFCE, “an often fatal pediatric clinical entity consisting of fever, encephalopathy, and new-onset seizures followed by rapid, diffuse, and medically-refractory cerebral edema.” They add that “AFCE occurs as a rare complication of a variety of common pediatric infections, and a CNS [central nervous system] pathogen is identified in only a minority of cases, suggesting a para-infectious mechanism of edema.”
Neurologists offered a case definition of the “recently recognized” AFCE earlier this year.
“This was an extremely rare rapid progression to cerebral edema. I think it was related to the patient’s COVID infection, but why this patient got it and others don’t is unknown,” Dr. Gershon said in an interview. “The full spectrum of neurological complications of COVID were not yet known [at the time]. We didn’t know, and still don’t know, what the causative links are between COVID and suddenly having seizures and brain swelling.”
He said he’d treat a similar patient differently now and give dexamethasone earlier in the clinical course, although “there is no data to tell us if any therapy could have reversed it.” Specifically, he said, “I’d give dexamethasone at the first sign of brain involvement, using the dosing recommended for cerebral edema, and try to get the MRI earlier in the course.”
Dr. Gershon and colleagues noted another case of fatal cerebral edema in a child, a 7-year-old boy who was treated in New York state. That case “shows that fatal cerebral edema may complicate pediatric multisystem inflammatory syndrome,” they wrote.
Pediatric critical care specialist Preetha Krishnan, MD, of Randall Children’s Hospital at Legacy Emanuel in Portland, Ore., helped develop the new definition of AFCE. In an interview, she said AFCE is difficult to diagnose because the signs/symptoms – such as fever, altered sensorium, and seizures – are found in other conditions such as febrile status epilepticus with a viral illness.
“The key to recognition of AFCE is that unlike other disease processes, these children have rapid neurologic progression,” she said. “In addition, many of our AFCE patients also had vomiting and/or headache, which in retrospect was likely an indication of elevated ICP [intracranial pressure] rather than viral infection.”
She added that “if a child with fever, seizures, and encephalopathy has cerebral edema on imaging and/or has neurologic progression, AFCE should be considered. Most of our cases of AFCE had fulminant progression within the first 3 days of their head imaging noting cerebral edema. There are other neurologic diseases, such as acute necrotizing encephalopathy of childhood, that also have progressive signs/symptoms, but head imaging and lab work should help differentiate many of these etiologies.”
In regard to treatment, she said, “our unit would likely err on the side of providing as much neuroprotective measures as is reasonable, such as maintaining normothermia, consideration of hyperosmolar therapy, maintaining normocarbia and normoxemia, managing seizures, etc. I would recommend getting the entire neurocritical care team involved in the management discussion. This varies by center, but will likely include neurology, ID [infectious disease], possibly neurosurgery, and PICU.”
As for the new case report, Krishnan said COVID-19 has been linked to neurologic complications, “so it does not surprise me that AFCE is part of the neurologic spectrum of disease.”
No funding was reported, and the authors report no relevant disclosures. Dr. Krishnan has no disclosures.
FROM CNS 2021
Maternal SSRI use linked to more encephalopathy in newborns, risk still small
, although the overall risk remains extremely low, a new study finds.
The findings were presented in a poster at the 50th annual meeting of the Child Neurology Society.
“Our work showed that neonates exposed to SSRI in utero had higher risks of neonatal encephalopathy even when adjusting for confounders such as maternal mental health disorders and age. SSRIs could cause side effects such as encephalopathy in neonates, and these risks need to be balanced carefully with the potential benefits of treatment to the mother,” study lead author Marie Cornet, MD, a neonatology fellow with Benioff Children’s Hospital at the University of California, San Francisco, said in an interview.
According to Dr. Cornet, “we know that SSRI exposure in utero is associated with increased risks of respiratory distress at birth, need for positive-pressure ventilation, and an abnormal neurologic exam.” The researchers launched the new study to determine if the estimated 4%-8% of pregnant women who take SSRIs may be putting their newborns at greater risk of NE.
The researchers retrospectively tracked 305,426 infants who were born in the Kaiser Permanente Northern California health system (≥35 weeks) from 2011 to 2019. The mothers had an average age of 31 years, and approximately 34.7% were White, 34.7% of unknown race, 23.3% Asian, and 6.2% Black.
The researchers defined NE as a “5-minute APGAR score <7 and abnormal level of consciousness, activity, tone, or reflexes.”
A total of 8,024 infants (2.6%) had mothers who used SSRIs in the third trimester, and 510 (0.17%) were determined to have had NE.
After adjustment for maternal depression or anxiety, maternal age, race, and hospital, exposed neonates had 2.7 times higher odds of NE (odds ratio, 2.7).
Each 25 mg per day increase in the dose of SSRIs, as equalized to doses of sertraline (Zoloft), was linked to a significant 31% increase in the odds of developing NE (OR, 1.31).
The study doesn’t examine the benefits of SSRI treatment in pregnancy. Those taking SSRIs were much more likely to have depression during pregnancy (76.5% vs. 13.5%) and anxiety (56.7% vs. 6.9%), compared with those who did not take the drug.
The possible connection between SSRIs and NE is unclear. “SSRIs may contribute to NE by a withdrawal mechanism or by a toxicity mechanism. It is also possible that SSRIs themselves are not responsible for encephalopathy, or that the severity of maternal mental health is itself responsible for increased neonatal encephalopathy,” Dr. Cornet said. “However, we believe we adjusted our results thoroughly for that. Furthermore, in this cohort, neonates born from mothers with untreated depression were not at higher risk of encephalopathy than neonates born to mothers without depression.”
She added: “When infants have acidosis or require prolonged resuscitation after birth, they get treated with therapeutic hypothermia. This invasive treatment was shown to decrease mortality and morbidity in neonates with hypoxic-ischemic encephalopathy. However, therapeutic hypothermia may not be helpful in infants with encephalopathy due to other causes than acute hypoxia-ischemia, such as infection, inflammation, genetic conditions, or exposure to toxins. In the case of SSRIs, our results show that, while neonates often have encephalopathy, this encephalopathy is often mild and self-resolved. We did not see a statistically significant increase in acidosis or treatment with therapeutic hypothermia.”
In the future neurologists should consider SSRI use as a potential cause in cases of NE, Dr. Cornet said. “If there are no signs of hypoxic-ischemic encephalopathy – no evidence of acidosis, acute perinatal event – treatment with therapeutic hypothermia may not be indicated.”
Dr. Cornet said more research is in the works. “Studying the long-term side effect of SSRIs on neonatal brain development and injury is essential,” she said. “We plan to compare brain injury in neonates exposed and unexposed to SSRIs and examine long-term outcomes to assess if the effect of SSRI exposure is transient or has a lasting impact.”
This study was funded by the Thrasher Early Career Research Grant and by the Newborn Brain Research Innovation Award at UCSF. The authors have no relevant disclosures.
, although the overall risk remains extremely low, a new study finds.
The findings were presented in a poster at the 50th annual meeting of the Child Neurology Society.
“Our work showed that neonates exposed to SSRI in utero had higher risks of neonatal encephalopathy even when adjusting for confounders such as maternal mental health disorders and age. SSRIs could cause side effects such as encephalopathy in neonates, and these risks need to be balanced carefully with the potential benefits of treatment to the mother,” study lead author Marie Cornet, MD, a neonatology fellow with Benioff Children’s Hospital at the University of California, San Francisco, said in an interview.
According to Dr. Cornet, “we know that SSRI exposure in utero is associated with increased risks of respiratory distress at birth, need for positive-pressure ventilation, and an abnormal neurologic exam.” The researchers launched the new study to determine if the estimated 4%-8% of pregnant women who take SSRIs may be putting their newborns at greater risk of NE.
The researchers retrospectively tracked 305,426 infants who were born in the Kaiser Permanente Northern California health system (≥35 weeks) from 2011 to 2019. The mothers had an average age of 31 years, and approximately 34.7% were White, 34.7% of unknown race, 23.3% Asian, and 6.2% Black.
The researchers defined NE as a “5-minute APGAR score <7 and abnormal level of consciousness, activity, tone, or reflexes.”
A total of 8,024 infants (2.6%) had mothers who used SSRIs in the third trimester, and 510 (0.17%) were determined to have had NE.
After adjustment for maternal depression or anxiety, maternal age, race, and hospital, exposed neonates had 2.7 times higher odds of NE (odds ratio, 2.7).
Each 25 mg per day increase in the dose of SSRIs, as equalized to doses of sertraline (Zoloft), was linked to a significant 31% increase in the odds of developing NE (OR, 1.31).
The study doesn’t examine the benefits of SSRI treatment in pregnancy. Those taking SSRIs were much more likely to have depression during pregnancy (76.5% vs. 13.5%) and anxiety (56.7% vs. 6.9%), compared with those who did not take the drug.
The possible connection between SSRIs and NE is unclear. “SSRIs may contribute to NE by a withdrawal mechanism or by a toxicity mechanism. It is also possible that SSRIs themselves are not responsible for encephalopathy, or that the severity of maternal mental health is itself responsible for increased neonatal encephalopathy,” Dr. Cornet said. “However, we believe we adjusted our results thoroughly for that. Furthermore, in this cohort, neonates born from mothers with untreated depression were not at higher risk of encephalopathy than neonates born to mothers without depression.”
She added: “When infants have acidosis or require prolonged resuscitation after birth, they get treated with therapeutic hypothermia. This invasive treatment was shown to decrease mortality and morbidity in neonates with hypoxic-ischemic encephalopathy. However, therapeutic hypothermia may not be helpful in infants with encephalopathy due to other causes than acute hypoxia-ischemia, such as infection, inflammation, genetic conditions, or exposure to toxins. In the case of SSRIs, our results show that, while neonates often have encephalopathy, this encephalopathy is often mild and self-resolved. We did not see a statistically significant increase in acidosis or treatment with therapeutic hypothermia.”
In the future neurologists should consider SSRI use as a potential cause in cases of NE, Dr. Cornet said. “If there are no signs of hypoxic-ischemic encephalopathy – no evidence of acidosis, acute perinatal event – treatment with therapeutic hypothermia may not be indicated.”
Dr. Cornet said more research is in the works. “Studying the long-term side effect of SSRIs on neonatal brain development and injury is essential,” she said. “We plan to compare brain injury in neonates exposed and unexposed to SSRIs and examine long-term outcomes to assess if the effect of SSRI exposure is transient or has a lasting impact.”
This study was funded by the Thrasher Early Career Research Grant and by the Newborn Brain Research Innovation Award at UCSF. The authors have no relevant disclosures.
, although the overall risk remains extremely low, a new study finds.
The findings were presented in a poster at the 50th annual meeting of the Child Neurology Society.
“Our work showed that neonates exposed to SSRI in utero had higher risks of neonatal encephalopathy even when adjusting for confounders such as maternal mental health disorders and age. SSRIs could cause side effects such as encephalopathy in neonates, and these risks need to be balanced carefully with the potential benefits of treatment to the mother,” study lead author Marie Cornet, MD, a neonatology fellow with Benioff Children’s Hospital at the University of California, San Francisco, said in an interview.
According to Dr. Cornet, “we know that SSRI exposure in utero is associated with increased risks of respiratory distress at birth, need for positive-pressure ventilation, and an abnormal neurologic exam.” The researchers launched the new study to determine if the estimated 4%-8% of pregnant women who take SSRIs may be putting their newborns at greater risk of NE.
The researchers retrospectively tracked 305,426 infants who were born in the Kaiser Permanente Northern California health system (≥35 weeks) from 2011 to 2019. The mothers had an average age of 31 years, and approximately 34.7% were White, 34.7% of unknown race, 23.3% Asian, and 6.2% Black.
The researchers defined NE as a “5-minute APGAR score <7 and abnormal level of consciousness, activity, tone, or reflexes.”
A total of 8,024 infants (2.6%) had mothers who used SSRIs in the third trimester, and 510 (0.17%) were determined to have had NE.
After adjustment for maternal depression or anxiety, maternal age, race, and hospital, exposed neonates had 2.7 times higher odds of NE (odds ratio, 2.7).
Each 25 mg per day increase in the dose of SSRIs, as equalized to doses of sertraline (Zoloft), was linked to a significant 31% increase in the odds of developing NE (OR, 1.31).
The study doesn’t examine the benefits of SSRI treatment in pregnancy. Those taking SSRIs were much more likely to have depression during pregnancy (76.5% vs. 13.5%) and anxiety (56.7% vs. 6.9%), compared with those who did not take the drug.
The possible connection between SSRIs and NE is unclear. “SSRIs may contribute to NE by a withdrawal mechanism or by a toxicity mechanism. It is also possible that SSRIs themselves are not responsible for encephalopathy, or that the severity of maternal mental health is itself responsible for increased neonatal encephalopathy,” Dr. Cornet said. “However, we believe we adjusted our results thoroughly for that. Furthermore, in this cohort, neonates born from mothers with untreated depression were not at higher risk of encephalopathy than neonates born to mothers without depression.”
She added: “When infants have acidosis or require prolonged resuscitation after birth, they get treated with therapeutic hypothermia. This invasive treatment was shown to decrease mortality and morbidity in neonates with hypoxic-ischemic encephalopathy. However, therapeutic hypothermia may not be helpful in infants with encephalopathy due to other causes than acute hypoxia-ischemia, such as infection, inflammation, genetic conditions, or exposure to toxins. In the case of SSRIs, our results show that, while neonates often have encephalopathy, this encephalopathy is often mild and self-resolved. We did not see a statistically significant increase in acidosis or treatment with therapeutic hypothermia.”
In the future neurologists should consider SSRI use as a potential cause in cases of NE, Dr. Cornet said. “If there are no signs of hypoxic-ischemic encephalopathy – no evidence of acidosis, acute perinatal event – treatment with therapeutic hypothermia may not be indicated.”
Dr. Cornet said more research is in the works. “Studying the long-term side effect of SSRIs on neonatal brain development and injury is essential,” she said. “We plan to compare brain injury in neonates exposed and unexposed to SSRIs and examine long-term outcomes to assess if the effect of SSRI exposure is transient or has a lasting impact.”
This study was funded by the Thrasher Early Career Research Grant and by the Newborn Brain Research Innovation Award at UCSF. The authors have no relevant disclosures.
FROM CNS 2021
Handheld device highly sensitive in detecting amblyopia; can be used in children as young as 2 years of age
A handheld vision screening device to test for amblyopia and strabismus has been found to have a sensitivity of 100%, a specificity of 85%, and a median acquisition time of 28 seconds, according to a study published in the Journal of American Association for Pediatric Ophthalmology and Strabismus.
The prospective study involved 300 children recruited from two Kaiser Permanente Southern California pediatric clinics. The patients, aged 24-72 months, were first screened by trained research staff for amblyopia and strabismus using the device, called the Pediatric Vision Scanner (PVS). They were subsequently screened by a pediatric ophthalmologist who was masked to the previous screening results and who then performed a comprehensive eye examination.
With the gold-standard ophthalmologist examination, six children (2%) were identified as having amblyopia and/or strabismus. Using the PVS, all six children with amblyopia and/or strabismus were identified, yielding 100% sensitivity. PVS findings were normal for 45 children (15%), yielding a specificity rate of 85%. The positive predictive value was 26.0% (95% confidence interval, 12.4%-32.4%), and the negative predictive value was 100% (95% CI, 97.1%-100%).
The findings suggest that the device could be used to screen for amblyopia, according to Shaival S. Shah, MD, the study’s first author, who is a pediatric ophthalmologist and regional section lead of pediatric ophthalmology, Southern California Permanente Medical Group.
“A strength of this device is that it is user friendly and easy to use and very quick, which is essential when working with young children,” said Dr. Shah in an interview. He noted that the device could be used for children as young as 2 years.
Dr. Shah pointed out that the children were recruited from a pediatrician’s office and reflect more of a “real-world setting” than had they been recruited from a pediatric ophthalmology clinic.
Dr. Shah added that, with a negative predictive value of 100%, the device is highly reliable at informing the clinician that amblyopia is not present. “It did have a positive predictive value of 26%, which needs to be considered when deciding one’s vision screening strategy,” he said.
A limitation of the study is that there was no head-to-head comparison with another screening device, noted Dr. Shah. “While it may have been more useful to include another vision screening device to have a head-to-head comparison, we did not do this to limit complexity and cost.”
Michael J. Wan, MD, FRCSC, pediatric ophthalmologist, Sick Kids Hospital, Toronto, and assistant professor at the University of Toronto, told this news organization that the device has multiple strengths, including quick acquisition time and excellent detection rate of amblyopia and strabismus in children as young as 2 years.
“It is highly reliable at informing the clinician that amblyopia is not present,” said Dr. Wan, who was not involved in the study. “The PVS uses an elegant mechanism to test for amblyopia directly (as opposed to other screening devices, which only detect risk factors). This study demonstrates the impressive diagnostic accuracy of this approach. With a study population of 300 children, the PVS had a sensitivity of 100% and specificity of 85% (over 90% in cooperative children). This means that the PVS would detect essentially all cases of amblyopia and strabismus while minimizing the number of unnecessary referrals and examinations.”
He added that, although the study included children as young as 2 years, only 2.5% of the children were unable to complete the PVS test. “Detecting amblyopia in children at an age when treatment is still effective has been a longstanding goal in pediatric ophthalmology,” said Dr. Wan, who described the technology as user friendly. “Based on this study, the search for an accurate and practical pediatric vision screening device appears to be over.”
Dr. Wan said it would be useful to replicate this study with a different population to confirm the findings.
Dr. Shah and Dr. Wan disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
A handheld vision screening device to test for amblyopia and strabismus has been found to have a sensitivity of 100%, a specificity of 85%, and a median acquisition time of 28 seconds, according to a study published in the Journal of American Association for Pediatric Ophthalmology and Strabismus.
The prospective study involved 300 children recruited from two Kaiser Permanente Southern California pediatric clinics. The patients, aged 24-72 months, were first screened by trained research staff for amblyopia and strabismus using the device, called the Pediatric Vision Scanner (PVS). They were subsequently screened by a pediatric ophthalmologist who was masked to the previous screening results and who then performed a comprehensive eye examination.
With the gold-standard ophthalmologist examination, six children (2%) were identified as having amblyopia and/or strabismus. Using the PVS, all six children with amblyopia and/or strabismus were identified, yielding 100% sensitivity. PVS findings were normal for 45 children (15%), yielding a specificity rate of 85%. The positive predictive value was 26.0% (95% confidence interval, 12.4%-32.4%), and the negative predictive value was 100% (95% CI, 97.1%-100%).
The findings suggest that the device could be used to screen for amblyopia, according to Shaival S. Shah, MD, the study’s first author, who is a pediatric ophthalmologist and regional section lead of pediatric ophthalmology, Southern California Permanente Medical Group.
“A strength of this device is that it is user friendly and easy to use and very quick, which is essential when working with young children,” said Dr. Shah in an interview. He noted that the device could be used for children as young as 2 years.
Dr. Shah pointed out that the children were recruited from a pediatrician’s office and reflect more of a “real-world setting” than had they been recruited from a pediatric ophthalmology clinic.
Dr. Shah added that, with a negative predictive value of 100%, the device is highly reliable at informing the clinician that amblyopia is not present. “It did have a positive predictive value of 26%, which needs to be considered when deciding one’s vision screening strategy,” he said.
A limitation of the study is that there was no head-to-head comparison with another screening device, noted Dr. Shah. “While it may have been more useful to include another vision screening device to have a head-to-head comparison, we did not do this to limit complexity and cost.”
Michael J. Wan, MD, FRCSC, pediatric ophthalmologist, Sick Kids Hospital, Toronto, and assistant professor at the University of Toronto, told this news organization that the device has multiple strengths, including quick acquisition time and excellent detection rate of amblyopia and strabismus in children as young as 2 years.
“It is highly reliable at informing the clinician that amblyopia is not present,” said Dr. Wan, who was not involved in the study. “The PVS uses an elegant mechanism to test for amblyopia directly (as opposed to other screening devices, which only detect risk factors). This study demonstrates the impressive diagnostic accuracy of this approach. With a study population of 300 children, the PVS had a sensitivity of 100% and specificity of 85% (over 90% in cooperative children). This means that the PVS would detect essentially all cases of amblyopia and strabismus while minimizing the number of unnecessary referrals and examinations.”
He added that, although the study included children as young as 2 years, only 2.5% of the children were unable to complete the PVS test. “Detecting amblyopia in children at an age when treatment is still effective has been a longstanding goal in pediatric ophthalmology,” said Dr. Wan, who described the technology as user friendly. “Based on this study, the search for an accurate and practical pediatric vision screening device appears to be over.”
Dr. Wan said it would be useful to replicate this study with a different population to confirm the findings.
Dr. Shah and Dr. Wan disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
A handheld vision screening device to test for amblyopia and strabismus has been found to have a sensitivity of 100%, a specificity of 85%, and a median acquisition time of 28 seconds, according to a study published in the Journal of American Association for Pediatric Ophthalmology and Strabismus.
The prospective study involved 300 children recruited from two Kaiser Permanente Southern California pediatric clinics. The patients, aged 24-72 months, were first screened by trained research staff for amblyopia and strabismus using the device, called the Pediatric Vision Scanner (PVS). They were subsequently screened by a pediatric ophthalmologist who was masked to the previous screening results and who then performed a comprehensive eye examination.
With the gold-standard ophthalmologist examination, six children (2%) were identified as having amblyopia and/or strabismus. Using the PVS, all six children with amblyopia and/or strabismus were identified, yielding 100% sensitivity. PVS findings were normal for 45 children (15%), yielding a specificity rate of 85%. The positive predictive value was 26.0% (95% confidence interval, 12.4%-32.4%), and the negative predictive value was 100% (95% CI, 97.1%-100%).
The findings suggest that the device could be used to screen for amblyopia, according to Shaival S. Shah, MD, the study’s first author, who is a pediatric ophthalmologist and regional section lead of pediatric ophthalmology, Southern California Permanente Medical Group.
“A strength of this device is that it is user friendly and easy to use and very quick, which is essential when working with young children,” said Dr. Shah in an interview. He noted that the device could be used for children as young as 2 years.
Dr. Shah pointed out that the children were recruited from a pediatrician’s office and reflect more of a “real-world setting” than had they been recruited from a pediatric ophthalmology clinic.
Dr. Shah added that, with a negative predictive value of 100%, the device is highly reliable at informing the clinician that amblyopia is not present. “It did have a positive predictive value of 26%, which needs to be considered when deciding one’s vision screening strategy,” he said.
A limitation of the study is that there was no head-to-head comparison with another screening device, noted Dr. Shah. “While it may have been more useful to include another vision screening device to have a head-to-head comparison, we did not do this to limit complexity and cost.”
Michael J. Wan, MD, FRCSC, pediatric ophthalmologist, Sick Kids Hospital, Toronto, and assistant professor at the University of Toronto, told this news organization that the device has multiple strengths, including quick acquisition time and excellent detection rate of amblyopia and strabismus in children as young as 2 years.
“It is highly reliable at informing the clinician that amblyopia is not present,” said Dr. Wan, who was not involved in the study. “The PVS uses an elegant mechanism to test for amblyopia directly (as opposed to other screening devices, which only detect risk factors). This study demonstrates the impressive diagnostic accuracy of this approach. With a study population of 300 children, the PVS had a sensitivity of 100% and specificity of 85% (over 90% in cooperative children). This means that the PVS would detect essentially all cases of amblyopia and strabismus while minimizing the number of unnecessary referrals and examinations.”
He added that, although the study included children as young as 2 years, only 2.5% of the children were unable to complete the PVS test. “Detecting amblyopia in children at an age when treatment is still effective has been a longstanding goal in pediatric ophthalmology,” said Dr. Wan, who described the technology as user friendly. “Based on this study, the search for an accurate and practical pediatric vision screening device appears to be over.”
Dr. Wan said it would be useful to replicate this study with a different population to confirm the findings.
Dr. Shah and Dr. Wan disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
FDA clears first mobile rapid test for concussion
, the company has announced.
Eye-Sync is a virtual reality eye-tracking platform that provides objective measurements to aid in the assessment of concussion. It’s the first mobile, rapid test for concussion that has been cleared by the FDA, the company said.
As reported by this news organization, Eye-Sync received breakthrough designation from the FDA for this indication in March 2019.
The FDA initially cleared the Eye-Sync platform for recording, viewing, and analyzing eye movements to help clinicians identify visual tracking impairment.
The Eye-Sync technology uses a series of 60-second eye tracking assessments, neurocognitive batteries, symptom inventories, and standardized patient inventories to identify the type and severity of impairment after concussion.
“The platform generates customizable and interpretive reports that support clinical decision making and offers visual and vestibular therapies to remedy deficits and monitor improvement over time,” the company said.
In support of the application for use in concussion, SyncThink enrolled 1,655 children and adults into a clinical study that collected comprehensive patient and concussion-related data for over 12 months.
The company used these data to develop proprietary algorithms and deep learning models to identify a positive or negative indication of concussion.
The study showed that Eye-Sinc had sensitivity greater than 82% and specificity greater than 93%, “thereby providing clinicians with significant and actionable data when evaluating individuals with concussion,” the company said in a news release.
“The outcome of this study very clearly shows the effectiveness of our technology at detecting concussion and definitively demonstrates the clinical utility of Eye-Sinc,” SyncThink Chief Clinical Officer Scott Anderson said in the release.
“It also shows that the future of concussion diagnosis is no longer purely symptom-based but that of a technology driven multi-modal approach,” Mr. Anderson said.
A version of this article first appeared on Medscape.com.
, the company has announced.
Eye-Sync is a virtual reality eye-tracking platform that provides objective measurements to aid in the assessment of concussion. It’s the first mobile, rapid test for concussion that has been cleared by the FDA, the company said.
As reported by this news organization, Eye-Sync received breakthrough designation from the FDA for this indication in March 2019.
The FDA initially cleared the Eye-Sync platform for recording, viewing, and analyzing eye movements to help clinicians identify visual tracking impairment.
The Eye-Sync technology uses a series of 60-second eye tracking assessments, neurocognitive batteries, symptom inventories, and standardized patient inventories to identify the type and severity of impairment after concussion.
“The platform generates customizable and interpretive reports that support clinical decision making and offers visual and vestibular therapies to remedy deficits and monitor improvement over time,” the company said.
In support of the application for use in concussion, SyncThink enrolled 1,655 children and adults into a clinical study that collected comprehensive patient and concussion-related data for over 12 months.
The company used these data to develop proprietary algorithms and deep learning models to identify a positive or negative indication of concussion.
The study showed that Eye-Sinc had sensitivity greater than 82% and specificity greater than 93%, “thereby providing clinicians with significant and actionable data when evaluating individuals with concussion,” the company said in a news release.
“The outcome of this study very clearly shows the effectiveness of our technology at detecting concussion and definitively demonstrates the clinical utility of Eye-Sinc,” SyncThink Chief Clinical Officer Scott Anderson said in the release.
“It also shows that the future of concussion diagnosis is no longer purely symptom-based but that of a technology driven multi-modal approach,” Mr. Anderson said.
A version of this article first appeared on Medscape.com.
, the company has announced.
Eye-Sync is a virtual reality eye-tracking platform that provides objective measurements to aid in the assessment of concussion. It’s the first mobile, rapid test for concussion that has been cleared by the FDA, the company said.
As reported by this news organization, Eye-Sync received breakthrough designation from the FDA for this indication in March 2019.
The FDA initially cleared the Eye-Sync platform for recording, viewing, and analyzing eye movements to help clinicians identify visual tracking impairment.
The Eye-Sync technology uses a series of 60-second eye tracking assessments, neurocognitive batteries, symptom inventories, and standardized patient inventories to identify the type and severity of impairment after concussion.
“The platform generates customizable and interpretive reports that support clinical decision making and offers visual and vestibular therapies to remedy deficits and monitor improvement over time,” the company said.
In support of the application for use in concussion, SyncThink enrolled 1,655 children and adults into a clinical study that collected comprehensive patient and concussion-related data for over 12 months.
The company used these data to develop proprietary algorithms and deep learning models to identify a positive or negative indication of concussion.
The study showed that Eye-Sinc had sensitivity greater than 82% and specificity greater than 93%, “thereby providing clinicians with significant and actionable data when evaluating individuals with concussion,” the company said in a news release.
“The outcome of this study very clearly shows the effectiveness of our technology at detecting concussion and definitively demonstrates the clinical utility of Eye-Sinc,” SyncThink Chief Clinical Officer Scott Anderson said in the release.
“It also shows that the future of concussion diagnosis is no longer purely symptom-based but that of a technology driven multi-modal approach,” Mr. Anderson said.
A version of this article first appeared on Medscape.com.
Is AFib a stroke cause or innocent bystander? The debate continues
Discovery of substantial atrial fibrillation (AFib) is usually an indication to start oral anticoagulation (OAC) for stroke prevention, but it’s far from settled whether such AFib is actually a direct cause of thromboembolic stroke. And that has implications for whether patients with occasional bouts of the arrhythmia need to be on continuous OAC.
It’s possible that some with infrequent paroxysmal AFib can get away with OAC maintained only about as long as the arrhythmia persists, and then go off the drugs, say researchers based on their study, which, they caution, would need the support of prospective trials before such a strategy could be considered.
But importantly, in their patients who had been continuously monitored by their cardiac implantable electronic devices (CIEDs) prior to experiencing a stroke, the 30-day risk of that stroke more than tripled if their AFib burden on 1 day reached at least 5-6 hours. The risk jumped especially high within the first few days after accumulating that amount of AFib in a day, but then fell off sharply over the next few days.
Based on the study, “Your risk of stroke goes up acutely when you have an episode of AFib, and it decreases rapidly, back to baseline – certainly by 30 days and it looked like in our data by 5 days,” Daniel E. Singer, MD, of Massachusetts General Hospital, Boston, said in an interview.
Increasingly, he noted, “there’s a widespread belief that AFib is a risk marker, not a causal risk factor.” In that scenario, most embolic strokes are caused by thrombi formed as a result of an atrial myopathy, characterized by fibrosis and inflammation, that also happens to trigger AFib.
But said Dr. Singer, who is lead author on the analysis published online Sept. 29 in JAMA Cardiology.
Some studies have “shown that anticoagulants seem to lower stroke risk even in patients without atrial fib, and even from sources not likely to be coming from the atrium,” Mintu P. Turakhia, MD, of Stanford (Calif.) University, Palo Alto, said in an interview. Collectively they point to “atrial fibrillation as a cause of and a noncausal marker for stroke.”
For example, Dr. Turakhia pointed out in an editorial accompanying the current report that stroke in patients with CIEDs “may occur during prolonged periods of sinus rhythm.”
The current study, he said in an interview, doesn’t preclude atrial myopathy as one direct cause of stroke-associated thrombus, because probably both the myopathy and AFib can be culprits. Still, AFib itself it may bear more responsibility for strokes in patients with fewer competing risks for stroke.
In such patients at lower vascular risk, who may have a CHA2DS2-VASc score of only 1 or 2, for example, “AFib can become a more important cause” of ischemic stroke, Dr. Turakhia said. That’s when AFib is more likely to be temporally related to stroke as the likely culprit, the mechanism addressed by Dr. Singer and associates.
“I think we’re all trying to grapple with what the truth is,” Dr. Singer observed. Still, the current study was unusual for primarily looking at the temporal relationship between AFib and stroke, rather than stroke risk. “And once again, as we found in our earlier study, but now a much larger study, it’s a tight relationship.”
Based on the current results, he said, the risk is “high when you have AFib, and it decreases very rapidly after the AFib is over.” And, “it takes multiple hours of AFib to raise stroke risk.” Inclusion in the analysis required accumulation of at least 5.5 hours of AFib on at least 1 day in a month, the cut point at which stroke risk started to climb significantly in an earlier trial.
In the current analysis, however, the 30-day odds ratio for stroke was a nonsignificant 2.75 for an AFib burden of 6-23 hours in a day and jumped to a significant 5.0 for a burden in excess of 23 hours in a day. “That’s a lot of AFib” before the risk actually goes up, and supports AFib as causative, Dr. Singer said. If it were the myopathy itself triggering stroke in these particular patients, the risk would be ongoing and not subject to a threshold of AFib burden.
Implications for noncontinuous OAC
“The hope is that there are people who have very little AFib: They may have several hours, and then they have nothing for 6 months. Do they have to be anticoagulated or not?” Dr. Singer asked.
“If you believe the risk-marker story, you might say they have to be anticoagulated. But if you believe our results, you would certainly think there’s a good chance they don’t have to be anticoagulated,” he said.
“So it is logical to think, if you have the right people and continuous monitoring, that you could have time-delimited anticoagulation.” That is, patients might start right away on a direct OAC once reaching the AFib threshold in a day, Dr. Singer said, “going on and off anticoagulants in parallel with their episodes of AFib.”
The strategy wouldn’t be feasible in patients who often experience AFib, Dr. Singer noted, “but it might work for people who have infrequent paroxysmal AFib.” It certainly would first have to be tested in prospective trials, he said. Such trials would be more practical than ever to carry out given the growing availability of continuous AFib monitoring by wearables.
“We need a trial to make the case whether it’s safe or not,” Dr. Turakhia said of such a rhythm-guided approach to OAC for AFib. The population to start with, he said, would be patients with paroxysmal AFib and low CHA2DS2-VASc scores. “If you think CHA2DS2-VASc as an integrated score of vascular risk, such patients would have a lot fewer reasons to have strokes. And if they do have a stroke, it’s more reasonable to assume that it’s likely caused by atrial fib and not just a marker.”
Importantly, such a strategy could well be safer than continuous OAC for some patients – those at the lowest vascular risk and with the most occasional AFib and lowest AFib burden “who are otherwise doing fine,” Dr. Turakhia said. In such patients on continuous OAC, he proposed, the risks of bleeding and intracranial hemorrhage could potentially exceed the expected degree of protection from ischemic events.
Discordant periods of AFib burden
Dr. Singer and his colleagues linked a national electronic health record database with Medtronic CareLink records covering 10 years to identify 891 patients who experienced an ischemic stroke preceded by at least 120 days of continuous heart-rhythm monitoring.
The patients were then categorized by their pattern of AFib, if any, within each of two prestroke periods: the most recent 30 days, which was the test period, and the preceding 91-120 days, the control period.
The analysis then excluded any patients who reached an AFib-burden threshold of at least 5.5 hours on any day during both the test and control periods, and those who did not attain that threshold in either period.
“The ones who had AFib in both periods mostly had permanent AFib, and ones that didn’t have AFib in either period mostly were in sinus rhythm,” Dr. Singer said. It was “close to 100%” in both cases.
Those exclusions left 66 patients, 7.4% of the total, who reached the AFib-burden threshold on at least 1 day during either the test or control periods, but not both. They included 52 and 14 patients, respectively, with “discordant” periods, that is, at least that burden of AFib in a day during either the test or control period, but not both.
Comparing AFib burden at test versus control periods among patients for whom the two periods were discordant yielded an OR for stroke of 3.71 (95% confidence interval, 2.06-6.70).
Stroke risk levels were not evenly spread throughout the 24-hour periods that met the AFib-burden threshold or the 30 days preceding the patients’ strokes. The OR for stroke was 5.00 (95% CI, 2.62-9.55) during days 1-5 following the day in which the AFib-burden threshold was met. And it was 5.00 (95% CI, 2.08-12.01) over 30 days if the AFib burden exceeded 23 hours on any day of the test period.
The study’s case-crossover design, in which each patient served as their own control, is one of its advantages, Dr. Singer observed. Most patient features, including CHA2DS2-VASc score and comorbidities, did not change appreciably from earliest to the latest 30-day period, which strengthens the comparison of the two because “you don’t have to worry about long-term confounding.”
Dr. Singer was supported by the Eliot B. and Edith C. Shoolman fund of the Massachusetts General Hospital. He discloses receiving grants from Boehringer Ingelheim and Bristol-Myers Squibb; personal fees from Boehringer Ingelheim, Bristol-Myers Squibb, Fitbit, Johnson & Johnson, Merck, and Pfizer; and royalties from UpToDate.
Dr. Turakhia discloses personal fees from Medtronic, Abbott, Sanofi, Pfizer, Myokardia, Johnson & Johnson, Milestone Pharmaceuticals, InCarda Therapeutics, 100Plus, Forward Pharma, and AliveCor; and grants from Bristol-Myers Squibb, the American Heart Association, Apple, and Bayer.
A version of this article first appeared on Medscape.com.
Discovery of substantial atrial fibrillation (AFib) is usually an indication to start oral anticoagulation (OAC) for stroke prevention, but it’s far from settled whether such AFib is actually a direct cause of thromboembolic stroke. And that has implications for whether patients with occasional bouts of the arrhythmia need to be on continuous OAC.
It’s possible that some with infrequent paroxysmal AFib can get away with OAC maintained only about as long as the arrhythmia persists, and then go off the drugs, say researchers based on their study, which, they caution, would need the support of prospective trials before such a strategy could be considered.
But importantly, in their patients who had been continuously monitored by their cardiac implantable electronic devices (CIEDs) prior to experiencing a stroke, the 30-day risk of that stroke more than tripled if their AFib burden on 1 day reached at least 5-6 hours. The risk jumped especially high within the first few days after accumulating that amount of AFib in a day, but then fell off sharply over the next few days.
Based on the study, “Your risk of stroke goes up acutely when you have an episode of AFib, and it decreases rapidly, back to baseline – certainly by 30 days and it looked like in our data by 5 days,” Daniel E. Singer, MD, of Massachusetts General Hospital, Boston, said in an interview.
Increasingly, he noted, “there’s a widespread belief that AFib is a risk marker, not a causal risk factor.” In that scenario, most embolic strokes are caused by thrombi formed as a result of an atrial myopathy, characterized by fibrosis and inflammation, that also happens to trigger AFib.
But said Dr. Singer, who is lead author on the analysis published online Sept. 29 in JAMA Cardiology.
Some studies have “shown that anticoagulants seem to lower stroke risk even in patients without atrial fib, and even from sources not likely to be coming from the atrium,” Mintu P. Turakhia, MD, of Stanford (Calif.) University, Palo Alto, said in an interview. Collectively they point to “atrial fibrillation as a cause of and a noncausal marker for stroke.”
For example, Dr. Turakhia pointed out in an editorial accompanying the current report that stroke in patients with CIEDs “may occur during prolonged periods of sinus rhythm.”
The current study, he said in an interview, doesn’t preclude atrial myopathy as one direct cause of stroke-associated thrombus, because probably both the myopathy and AFib can be culprits. Still, AFib itself it may bear more responsibility for strokes in patients with fewer competing risks for stroke.
In such patients at lower vascular risk, who may have a CHA2DS2-VASc score of only 1 or 2, for example, “AFib can become a more important cause” of ischemic stroke, Dr. Turakhia said. That’s when AFib is more likely to be temporally related to stroke as the likely culprit, the mechanism addressed by Dr. Singer and associates.
“I think we’re all trying to grapple with what the truth is,” Dr. Singer observed. Still, the current study was unusual for primarily looking at the temporal relationship between AFib and stroke, rather than stroke risk. “And once again, as we found in our earlier study, but now a much larger study, it’s a tight relationship.”
Based on the current results, he said, the risk is “high when you have AFib, and it decreases very rapidly after the AFib is over.” And, “it takes multiple hours of AFib to raise stroke risk.” Inclusion in the analysis required accumulation of at least 5.5 hours of AFib on at least 1 day in a month, the cut point at which stroke risk started to climb significantly in an earlier trial.
In the current analysis, however, the 30-day odds ratio for stroke was a nonsignificant 2.75 for an AFib burden of 6-23 hours in a day and jumped to a significant 5.0 for a burden in excess of 23 hours in a day. “That’s a lot of AFib” before the risk actually goes up, and supports AFib as causative, Dr. Singer said. If it were the myopathy itself triggering stroke in these particular patients, the risk would be ongoing and not subject to a threshold of AFib burden.
Implications for noncontinuous OAC
“The hope is that there are people who have very little AFib: They may have several hours, and then they have nothing for 6 months. Do they have to be anticoagulated or not?” Dr. Singer asked.
“If you believe the risk-marker story, you might say they have to be anticoagulated. But if you believe our results, you would certainly think there’s a good chance they don’t have to be anticoagulated,” he said.
“So it is logical to think, if you have the right people and continuous monitoring, that you could have time-delimited anticoagulation.” That is, patients might start right away on a direct OAC once reaching the AFib threshold in a day, Dr. Singer said, “going on and off anticoagulants in parallel with their episodes of AFib.”
The strategy wouldn’t be feasible in patients who often experience AFib, Dr. Singer noted, “but it might work for people who have infrequent paroxysmal AFib.” It certainly would first have to be tested in prospective trials, he said. Such trials would be more practical than ever to carry out given the growing availability of continuous AFib monitoring by wearables.
“We need a trial to make the case whether it’s safe or not,” Dr. Turakhia said of such a rhythm-guided approach to OAC for AFib. The population to start with, he said, would be patients with paroxysmal AFib and low CHA2DS2-VASc scores. “If you think CHA2DS2-VASc as an integrated score of vascular risk, such patients would have a lot fewer reasons to have strokes. And if they do have a stroke, it’s more reasonable to assume that it’s likely caused by atrial fib and not just a marker.”
Importantly, such a strategy could well be safer than continuous OAC for some patients – those at the lowest vascular risk and with the most occasional AFib and lowest AFib burden “who are otherwise doing fine,” Dr. Turakhia said. In such patients on continuous OAC, he proposed, the risks of bleeding and intracranial hemorrhage could potentially exceed the expected degree of protection from ischemic events.
Discordant periods of AFib burden
Dr. Singer and his colleagues linked a national electronic health record database with Medtronic CareLink records covering 10 years to identify 891 patients who experienced an ischemic stroke preceded by at least 120 days of continuous heart-rhythm monitoring.
The patients were then categorized by their pattern of AFib, if any, within each of two prestroke periods: the most recent 30 days, which was the test period, and the preceding 91-120 days, the control period.
The analysis then excluded any patients who reached an AFib-burden threshold of at least 5.5 hours on any day during both the test and control periods, and those who did not attain that threshold in either period.
“The ones who had AFib in both periods mostly had permanent AFib, and ones that didn’t have AFib in either period mostly were in sinus rhythm,” Dr. Singer said. It was “close to 100%” in both cases.
Those exclusions left 66 patients, 7.4% of the total, who reached the AFib-burden threshold on at least 1 day during either the test or control periods, but not both. They included 52 and 14 patients, respectively, with “discordant” periods, that is, at least that burden of AFib in a day during either the test or control period, but not both.
Comparing AFib burden at test versus control periods among patients for whom the two periods were discordant yielded an OR for stroke of 3.71 (95% confidence interval, 2.06-6.70).
Stroke risk levels were not evenly spread throughout the 24-hour periods that met the AFib-burden threshold or the 30 days preceding the patients’ strokes. The OR for stroke was 5.00 (95% CI, 2.62-9.55) during days 1-5 following the day in which the AFib-burden threshold was met. And it was 5.00 (95% CI, 2.08-12.01) over 30 days if the AFib burden exceeded 23 hours on any day of the test period.
The study’s case-crossover design, in which each patient served as their own control, is one of its advantages, Dr. Singer observed. Most patient features, including CHA2DS2-VASc score and comorbidities, did not change appreciably from earliest to the latest 30-day period, which strengthens the comparison of the two because “you don’t have to worry about long-term confounding.”
Dr. Singer was supported by the Eliot B. and Edith C. Shoolman fund of the Massachusetts General Hospital. He discloses receiving grants from Boehringer Ingelheim and Bristol-Myers Squibb; personal fees from Boehringer Ingelheim, Bristol-Myers Squibb, Fitbit, Johnson & Johnson, Merck, and Pfizer; and royalties from UpToDate.
Dr. Turakhia discloses personal fees from Medtronic, Abbott, Sanofi, Pfizer, Myokardia, Johnson & Johnson, Milestone Pharmaceuticals, InCarda Therapeutics, 100Plus, Forward Pharma, and AliveCor; and grants from Bristol-Myers Squibb, the American Heart Association, Apple, and Bayer.
A version of this article first appeared on Medscape.com.
Discovery of substantial atrial fibrillation (AFib) is usually an indication to start oral anticoagulation (OAC) for stroke prevention, but it’s far from settled whether such AFib is actually a direct cause of thromboembolic stroke. And that has implications for whether patients with occasional bouts of the arrhythmia need to be on continuous OAC.
It’s possible that some with infrequent paroxysmal AFib can get away with OAC maintained only about as long as the arrhythmia persists, and then go off the drugs, say researchers based on their study, which, they caution, would need the support of prospective trials before such a strategy could be considered.
But importantly, in their patients who had been continuously monitored by their cardiac implantable electronic devices (CIEDs) prior to experiencing a stroke, the 30-day risk of that stroke more than tripled if their AFib burden on 1 day reached at least 5-6 hours. The risk jumped especially high within the first few days after accumulating that amount of AFib in a day, but then fell off sharply over the next few days.
Based on the study, “Your risk of stroke goes up acutely when you have an episode of AFib, and it decreases rapidly, back to baseline – certainly by 30 days and it looked like in our data by 5 days,” Daniel E. Singer, MD, of Massachusetts General Hospital, Boston, said in an interview.
Increasingly, he noted, “there’s a widespread belief that AFib is a risk marker, not a causal risk factor.” In that scenario, most embolic strokes are caused by thrombi formed as a result of an atrial myopathy, characterized by fibrosis and inflammation, that also happens to trigger AFib.
But said Dr. Singer, who is lead author on the analysis published online Sept. 29 in JAMA Cardiology.
Some studies have “shown that anticoagulants seem to lower stroke risk even in patients without atrial fib, and even from sources not likely to be coming from the atrium,” Mintu P. Turakhia, MD, of Stanford (Calif.) University, Palo Alto, said in an interview. Collectively they point to “atrial fibrillation as a cause of and a noncausal marker for stroke.”
For example, Dr. Turakhia pointed out in an editorial accompanying the current report that stroke in patients with CIEDs “may occur during prolonged periods of sinus rhythm.”
The current study, he said in an interview, doesn’t preclude atrial myopathy as one direct cause of stroke-associated thrombus, because probably both the myopathy and AFib can be culprits. Still, AFib itself it may bear more responsibility for strokes in patients with fewer competing risks for stroke.
In such patients at lower vascular risk, who may have a CHA2DS2-VASc score of only 1 or 2, for example, “AFib can become a more important cause” of ischemic stroke, Dr. Turakhia said. That’s when AFib is more likely to be temporally related to stroke as the likely culprit, the mechanism addressed by Dr. Singer and associates.
“I think we’re all trying to grapple with what the truth is,” Dr. Singer observed. Still, the current study was unusual for primarily looking at the temporal relationship between AFib and stroke, rather than stroke risk. “And once again, as we found in our earlier study, but now a much larger study, it’s a tight relationship.”
Based on the current results, he said, the risk is “high when you have AFib, and it decreases very rapidly after the AFib is over.” And, “it takes multiple hours of AFib to raise stroke risk.” Inclusion in the analysis required accumulation of at least 5.5 hours of AFib on at least 1 day in a month, the cut point at which stroke risk started to climb significantly in an earlier trial.
In the current analysis, however, the 30-day odds ratio for stroke was a nonsignificant 2.75 for an AFib burden of 6-23 hours in a day and jumped to a significant 5.0 for a burden in excess of 23 hours in a day. “That’s a lot of AFib” before the risk actually goes up, and supports AFib as causative, Dr. Singer said. If it were the myopathy itself triggering stroke in these particular patients, the risk would be ongoing and not subject to a threshold of AFib burden.
Implications for noncontinuous OAC
“The hope is that there are people who have very little AFib: They may have several hours, and then they have nothing for 6 months. Do they have to be anticoagulated or not?” Dr. Singer asked.
“If you believe the risk-marker story, you might say they have to be anticoagulated. But if you believe our results, you would certainly think there’s a good chance they don’t have to be anticoagulated,” he said.
“So it is logical to think, if you have the right people and continuous monitoring, that you could have time-delimited anticoagulation.” That is, patients might start right away on a direct OAC once reaching the AFib threshold in a day, Dr. Singer said, “going on and off anticoagulants in parallel with their episodes of AFib.”
The strategy wouldn’t be feasible in patients who often experience AFib, Dr. Singer noted, “but it might work for people who have infrequent paroxysmal AFib.” It certainly would first have to be tested in prospective trials, he said. Such trials would be more practical than ever to carry out given the growing availability of continuous AFib monitoring by wearables.
“We need a trial to make the case whether it’s safe or not,” Dr. Turakhia said of such a rhythm-guided approach to OAC for AFib. The population to start with, he said, would be patients with paroxysmal AFib and low CHA2DS2-VASc scores. “If you think CHA2DS2-VASc as an integrated score of vascular risk, such patients would have a lot fewer reasons to have strokes. And if they do have a stroke, it’s more reasonable to assume that it’s likely caused by atrial fib and not just a marker.”
Importantly, such a strategy could well be safer than continuous OAC for some patients – those at the lowest vascular risk and with the most occasional AFib and lowest AFib burden “who are otherwise doing fine,” Dr. Turakhia said. In such patients on continuous OAC, he proposed, the risks of bleeding and intracranial hemorrhage could potentially exceed the expected degree of protection from ischemic events.
Discordant periods of AFib burden
Dr. Singer and his colleagues linked a national electronic health record database with Medtronic CareLink records covering 10 years to identify 891 patients who experienced an ischemic stroke preceded by at least 120 days of continuous heart-rhythm monitoring.
The patients were then categorized by their pattern of AFib, if any, within each of two prestroke periods: the most recent 30 days, which was the test period, and the preceding 91-120 days, the control period.
The analysis then excluded any patients who reached an AFib-burden threshold of at least 5.5 hours on any day during both the test and control periods, and those who did not attain that threshold in either period.
“The ones who had AFib in both periods mostly had permanent AFib, and ones that didn’t have AFib in either period mostly were in sinus rhythm,” Dr. Singer said. It was “close to 100%” in both cases.
Those exclusions left 66 patients, 7.4% of the total, who reached the AFib-burden threshold on at least 1 day during either the test or control periods, but not both. They included 52 and 14 patients, respectively, with “discordant” periods, that is, at least that burden of AFib in a day during either the test or control period, but not both.
Comparing AFib burden at test versus control periods among patients for whom the two periods were discordant yielded an OR for stroke of 3.71 (95% confidence interval, 2.06-6.70).
Stroke risk levels were not evenly spread throughout the 24-hour periods that met the AFib-burden threshold or the 30 days preceding the patients’ strokes. The OR for stroke was 5.00 (95% CI, 2.62-9.55) during days 1-5 following the day in which the AFib-burden threshold was met. And it was 5.00 (95% CI, 2.08-12.01) over 30 days if the AFib burden exceeded 23 hours on any day of the test period.
The study’s case-crossover design, in which each patient served as their own control, is one of its advantages, Dr. Singer observed. Most patient features, including CHA2DS2-VASc score and comorbidities, did not change appreciably from earliest to the latest 30-day period, which strengthens the comparison of the two because “you don’t have to worry about long-term confounding.”
Dr. Singer was supported by the Eliot B. and Edith C. Shoolman fund of the Massachusetts General Hospital. He discloses receiving grants from Boehringer Ingelheim and Bristol-Myers Squibb; personal fees from Boehringer Ingelheim, Bristol-Myers Squibb, Fitbit, Johnson & Johnson, Merck, and Pfizer; and royalties from UpToDate.
Dr. Turakhia discloses personal fees from Medtronic, Abbott, Sanofi, Pfizer, Myokardia, Johnson & Johnson, Milestone Pharmaceuticals, InCarda Therapeutics, 100Plus, Forward Pharma, and AliveCor; and grants from Bristol-Myers Squibb, the American Heart Association, Apple, and Bayer.
A version of this article first appeared on Medscape.com.