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Lung cancer screening a challenge to implement
A comprehensive lung cancer screening program carried out at Veterans Health Administration hospitals was taxing to implement and revealed a large number of patients with results requiring follow-up, though only 1.5% had cancers.
Investigators at eight VHA hospitals, led by Linda S. Kinsinger, MD, of the VHA’s National Center for Health Promotion and Disease Prevention in Durham, N.C., looked at records from about 93,000 primary care patients and identified 4,246 eligible for screening, based on age, medical history, and smoking history (JAMA Intern Med. 2017 Jan 30. doi: 10.1001/jamainternmed.2016.9022).
Approximately 58% of the eligible patients consented, and 2,106 underwent screening with low-dose computed tomography (LDCT). The mean age of patients was 65 years, and 96% of patients were male.
Nearly 60% of patients screened (1,257) had nodules, 1,184 patients (56.2%) required tracking, and 31 patients (1.5%) had lung cancer.
The pilot study was developed in response to a 2013 recommendation from the U.S. Preventive Services Task Force favoring annual screening with LDCT in current or former heavy smokers between 55 and 80 years old.
The recommendation sparked concerns about the practicability of implementing large-scale lung cancer screening, which Dr. Kinsinger and her colleagues’ study seemed to underscore. For example, “creating electronic tools to capture the necessary clinical data in real time … proved to be difficult, even with the VHA’s highly regarded electronic medical record,” the investigators wrote. A key measure used in the screening program – cigarette pack-years – was “not fully captured” in the system’s EMR.
The investigators also noted that if the eligibility criteria used in the pilot program were applied to the VHA nationwide, about 900,000 patients would be eligible for LDCT screening, and that fewer than 60% of patients in this study had consented. That meant that “accurately identifying these patients and discussing with them the benefits and harms of [screening] will take significant effort for primary care teams,” the researchers noted.
In addition, the required follow-up “may stress the capacity” of radiology and pulmonology services, the study authors cautioned.
Finally, “primary care will need to be involved in deciding which incidental findings need further evaluation,” they wrote. “These clinical efforts will require coordination and communication among clinical services and between patients and staff, and dedicated coordinators will need to be hired.”
The investigators noted that their findings might not be generalizable to non-VHA health care systems. The experience of the VHA, “owing to its central organizational structure, may represent a best-case scenario,” they wrote.
The Veterans Health Administration funded the study. Two of its coauthors reported commercial conflicts of interest; one of those disclosed a grant application to the Bristol-Myers Squibb Foundation related to lung cancer screening.
A comprehensive lung cancer screening program carried out at Veterans Health Administration hospitals was taxing to implement and revealed a large number of patients with results requiring follow-up, though only 1.5% had cancers.
Investigators at eight VHA hospitals, led by Linda S. Kinsinger, MD, of the VHA’s National Center for Health Promotion and Disease Prevention in Durham, N.C., looked at records from about 93,000 primary care patients and identified 4,246 eligible for screening, based on age, medical history, and smoking history (JAMA Intern Med. 2017 Jan 30. doi: 10.1001/jamainternmed.2016.9022).
Approximately 58% of the eligible patients consented, and 2,106 underwent screening with low-dose computed tomography (LDCT). The mean age of patients was 65 years, and 96% of patients were male.
Nearly 60% of patients screened (1,257) had nodules, 1,184 patients (56.2%) required tracking, and 31 patients (1.5%) had lung cancer.
The pilot study was developed in response to a 2013 recommendation from the U.S. Preventive Services Task Force favoring annual screening with LDCT in current or former heavy smokers between 55 and 80 years old.
The recommendation sparked concerns about the practicability of implementing large-scale lung cancer screening, which Dr. Kinsinger and her colleagues’ study seemed to underscore. For example, “creating electronic tools to capture the necessary clinical data in real time … proved to be difficult, even with the VHA’s highly regarded electronic medical record,” the investigators wrote. A key measure used in the screening program – cigarette pack-years – was “not fully captured” in the system’s EMR.
The investigators also noted that if the eligibility criteria used in the pilot program were applied to the VHA nationwide, about 900,000 patients would be eligible for LDCT screening, and that fewer than 60% of patients in this study had consented. That meant that “accurately identifying these patients and discussing with them the benefits and harms of [screening] will take significant effort for primary care teams,” the researchers noted.
In addition, the required follow-up “may stress the capacity” of radiology and pulmonology services, the study authors cautioned.
Finally, “primary care will need to be involved in deciding which incidental findings need further evaluation,” they wrote. “These clinical efforts will require coordination and communication among clinical services and between patients and staff, and dedicated coordinators will need to be hired.”
The investigators noted that their findings might not be generalizable to non-VHA health care systems. The experience of the VHA, “owing to its central organizational structure, may represent a best-case scenario,” they wrote.
The Veterans Health Administration funded the study. Two of its coauthors reported commercial conflicts of interest; one of those disclosed a grant application to the Bristol-Myers Squibb Foundation related to lung cancer screening.
A comprehensive lung cancer screening program carried out at Veterans Health Administration hospitals was taxing to implement and revealed a large number of patients with results requiring follow-up, though only 1.5% had cancers.
Investigators at eight VHA hospitals, led by Linda S. Kinsinger, MD, of the VHA’s National Center for Health Promotion and Disease Prevention in Durham, N.C., looked at records from about 93,000 primary care patients and identified 4,246 eligible for screening, based on age, medical history, and smoking history (JAMA Intern Med. 2017 Jan 30. doi: 10.1001/jamainternmed.2016.9022).
Approximately 58% of the eligible patients consented, and 2,106 underwent screening with low-dose computed tomography (LDCT). The mean age of patients was 65 years, and 96% of patients were male.
Nearly 60% of patients screened (1,257) had nodules, 1,184 patients (56.2%) required tracking, and 31 patients (1.5%) had lung cancer.
The pilot study was developed in response to a 2013 recommendation from the U.S. Preventive Services Task Force favoring annual screening with LDCT in current or former heavy smokers between 55 and 80 years old.
The recommendation sparked concerns about the practicability of implementing large-scale lung cancer screening, which Dr. Kinsinger and her colleagues’ study seemed to underscore. For example, “creating electronic tools to capture the necessary clinical data in real time … proved to be difficult, even with the VHA’s highly regarded electronic medical record,” the investigators wrote. A key measure used in the screening program – cigarette pack-years – was “not fully captured” in the system’s EMR.
The investigators also noted that if the eligibility criteria used in the pilot program were applied to the VHA nationwide, about 900,000 patients would be eligible for LDCT screening, and that fewer than 60% of patients in this study had consented. That meant that “accurately identifying these patients and discussing with them the benefits and harms of [screening] will take significant effort for primary care teams,” the researchers noted.
In addition, the required follow-up “may stress the capacity” of radiology and pulmonology services, the study authors cautioned.
Finally, “primary care will need to be involved in deciding which incidental findings need further evaluation,” they wrote. “These clinical efforts will require coordination and communication among clinical services and between patients and staff, and dedicated coordinators will need to be hired.”
The investigators noted that their findings might not be generalizable to non-VHA health care systems. The experience of the VHA, “owing to its central organizational structure, may represent a best-case scenario,” they wrote.
The Veterans Health Administration funded the study. Two of its coauthors reported commercial conflicts of interest; one of those disclosed a grant application to the Bristol-Myers Squibb Foundation related to lung cancer screening.
FROM JAMA INTERNAL MEDICINE
Key clinical point: Comprehensive lung cancer screening is complex to implement in hospital primary care settings and may trigger resource-intensive follow-up.
Major finding: Of more than 2,000 patients screened, nearly 60% were positive for nodules, though only 1.5% had cancer.
Data source: A pilot study in 4,246 eligible primary care patients at eight Veterans Health Administration hospitals; 2,106 were screened using low-dose computed tomography.
Disclosures: The Veterans Health Administration funded the study. Two of its coauthors reported commercial conflicts of interest; one of those disclosed a grant application to the Bristol-Myers Squibb Foundation related to lung cancer screening.
Sleep apnea may induce distinct form of atrial fibrillation
ORLANDO – Patients with atrial fibrillation (AF) should be screened for obstructive sleep apnea (OSA), because this information may be useful in guiding ablation strategies, according to results of a prospective study.
The study, which associated OSA in AF with a high relative rate of non–pulmonary vein (PV) triggers, has contributed to the “growing body of evidence implicating sleep apnea in atrial remodeling and promotion of the AF substrate,” Elad Anter, MD, associate director of the clinical electrophysiology laboratory at Beth Israel Deaconess Medical Center, Boston, reported at the annual International AF Symposium.
Despite the close association between OSA and AF, it has been unclear whether OSA is a causative factor. Dr. Anter suggested that mechanistic association is strengthening, however.
It has been hypothesized that OSA generates AF substrate through negative intrathoracic pressure changes and autonomic nervous system activation. But Dr. Anter reported that there is more recent and compelling evidence that the repetitive occlusions produced by OSA result in remodeling of the atria, producing scar tissue that slows conduction and produces susceptibility to reentry AF.
A newly completed prospective multicenter study adds support to this latter hypothesis. In the protocol, patients with paroxysmal AF scheduled for ablation were required to undergo a sleep study, an AF mapping study, and follow-up for at least 12 months. A known history of OSA was an exclusion criterion. To isolate the effect of OSA, there were exclusions for other major etiologies for AF, such as heart failure or coronary artery disease.
The AF mapping was conducted when patients were in sinus rhythm “to evaluate the baseline atrial substrate and avoid measurements related to acute electrical remodeling,” Dr. Anter explained.
Of 172 patients initially enrolled, 133 completed the sleep study, 118 completed the mapping study, and 110 completed both and were followed for at least 12 months. Of these, 43 patients without OSA were compared with 43 patients with OSA defined as an apnea-hypopnea index (AHI) of at least 15. Patients in the two groups did not differ significantly for relevant characteristics, such as body mass index (BMI), age, presence of hypertension, or duration of AF; but the left atrial (LA) volume was significantly greater (P = .01) in those with OSA than those without.
Even though the prevalence of voltage abnormalities was higher in the OSA group for the right (P = .01) and left atria (P = .0001) before ablation, the prevalence of PV triggers (63% vs. 65%), non-PV triggers (19% vs. 12%) and noninducible triggers (19% vs. 23%) were similar.
After ablation, PV triggers were no longer inducible in either group, but there was a striking difference in inducible non-PV triggers. While only 11.6% remained inducible in the non-OSA group, 41.8% (P = .003) remained inducible in the OSA patients.
“AF triggers in OSA were most commonly located at the LA septum, at the zone of low voltage and abnormal electrograms, as determined during sinus rhythm,” Dr. Anter reported. “Ablation of these triggers at the zone of tissue abnormality in the OSA patients resulted in termination of AF in 9 (64.2%) of the 14 patients.”
Overall, at the end of 12 months, 79% of those without OSA remained in arrhythmia-free survival, versus 65.1% of the group with OSA that were treated with PV isolation alone.
The lower rate of success in the OSA group shows the importance of specifically directing ablation to the areas of low voltage and slow conduction in the left anterior septum that Dr. Anter indicated otherwise would be missed.
“These zones are a common source of extra-PV triggers and localized circuits or rotors of AF in OSA patients,” he reported. “Ablation of these low voltage zones is associated with improved clinical outcome in OSA patients with paroxysmal AF.”
The data, which Dr. Anter said are consistent with a growing body of work regarding the relationship of OSA and AF, provided the basis for suggesting that AF patients undergo routine screening for OSA.
In patients with OSA, ablation of PV triggers alone even in paroxysmal PAF “may not be sufficient,” he cautioned. “Evaluation of non-PV triggers should also be performed.”
Dr. Anter reported financial relationships with Biosense Webster and Boston Scientific.
Atrial fibrillation (AF) is the most common cardiac arrhythmia encountered in clinical practice and is associated with increased morbidity and mortality due to thromboembolism, stroke, and worsening of pre-existing heart failure. Both its incidence and prevalence are increasing as AF risk increases with advancing age.1 While the strategies of heart rate control and anticoagulation to lower stroke risk and rhythm control have been found comparable with regard to survival, many patients remain highly symptomatic because of palpitations and reduced cardiac output.1
Structural abnormalities of the atria, including fibrosis and dilation, accompanied by conduction abnormalities, provide the underlying substrate for AF. It is well established that AF episodes perpetuate atrial remodeling leading to more frequent and prolonged AF episodes. Hence, there is the long-standing notion that “AF begets AF.” While a variety of antiarrhythmic drugs have been employed over the years to prevent AF recurrences and to maintain sinus rhythm, their use has decreased over the past 2 decades due to their major side effects and their potential of proarrhythmia.
Since AF patients represent a heterogeneous group of patients with CV diseases of varying type and severity as well as comorbidities, it stands to reason that the pulmonary venous–left atrial junction may not be the sole culprit region of all cases of AF and that other anatomical locations might serve as triggers for AF.
In support of this notion are the results of the prospective multicenter study presented by Dr. Elad Anter at the annual International AF Symposium. This important study is consistent with and expands upon prior studies that have suggested that sites within the atria remote from the pulmonary veins may serve as triggers for AF, rather than lower technical success of pulmonary vein ablation.5 It further highlights the importance of fibrosis and associated electrical dispersion to the pathogenesis of AF.6 However, the recommendation that patients with AF be screened for OSA is not new, as nearly half of patients with AF also have OSA.7 While AF and OSA share common risk factors/comorbidities such as male gender, obesity, hypertension, coronary artery disease, and congestive heart failure, OSA has been found to be an independent risk factor for AF development.
It is important to know whether OSA was treated, as the presence of OSA raises the risk of AF recurrence and OSA treatment decreases AF recurrence after ablation.8,9 Conversely, in the setting of OSA, AF is more resistive to rhythm control. Enhanced vagal activation, elevated sympathetic tone, and oxidative stresses due to oxygen desaturation and left atrial distension have all been implicated in the pathogenesis linking OSA to the development of AF. Repeated increases in upper airway resistance during airway obstruction have been shown to lead to atrial stretch, dilation, and fibrosis.10 Since patients with heart failure, coronary artery disease, and other underlying causes for AF were excluded from the onset, the results may not be applicable to a large segment of AF patients. Exclusion of underlying cardiac conditions potentially raised the yield of patients found to have OSA and the potential value of OSA screening. Of note: Less than half of patients that were enrolled had complete data for analysis, which may further limit applicability of the study findings. All patients had paroxysmal AF and were in sinus rhythm while the mapping procedure was performed, leaving questions as to how to approach patients presenting acutely with persistent or long standing AF, or those recently treated with antiarrhythmic therapy. Also, since arrhythmia-free survival decreases from 1 to 5 years after AF ablation, and short-time success rates do not predict longer success rates, the present study results should be interpreted with cautious optimism.11
However, these limitations should not detract from the major implications of the study. In the setting of AF, OSA should be clinically suspected not only because of the frequent coexistence of the two disorders but because the presence of OSA should prompt electrophysiologists to consider non–pulmonary vein triggers of AF prior to ablation attempts. The consideration of alternative ablation sites might help to explain the lack of ablation procedure endpoints to predict long-term success of ablation and holds promise for increasing technical success rates. Given that airway obstruction may occur in other clinical settings such as seizure-induced laryngospasm and that seizures may induce arrhythmias and sudden death, there is potential for non–pulmonary vein sites to trigger AF and other arrhythmias in settings other than OSA as well.12 Whether other disease states are associated with a higher likelihood of non-pulmonary veins trigger sites also merits further study. Moreover, this study underscores the notion that with regard to AF ablation, “no one site fits all” and “clinical mapping” may serve as a valuable adjunct to anatomical mapping. It also serves as a reminder of the multidisciplinary nature of Chest Medicine and the need of a team oriented approach..
References
1. Iwasaki YK, Nishida K, Kato T, Nattel S. Atrial fibrillation pathophysiology: implications for management. Circulation. 2011;124:2264-74.
2. Verma A, Jiang CY, Betts TR, et al. Approaches to catheter ablation for persistent atrial fibrillation. N Engl J Med. 2015;372:1812-22.
3. Kuck KH, Brugada J, Fürnkranz A, et al. Cryoballoon or radiofrequency ablation for paroxysmal atrial fibrillation. N Engl J Med. 2016;374:2235-45.
4. Calkins H, Reynolds MR, Spector P, et al. Treatment of atrial fibrillation with antiarrhythmic drugs or radiofrequency ablation: two systematic literature reviews and meta-analyses. Circ Arrhythm Electrophysiol. 2009;2:349-61.
5. Narayan SM, Krummen DE, Shivkumar K, et al. Treatment of atrial fibrillation by the ablation of localized sources: CONFIRM (Conventional Ablation for Atrial Fibrillation With or Without Focal Impulse and Rotor Modulation) trial. J Am Coll Cardiol. 2012;60:628-36.
6. Kottkamp H, Berg J, Bender R, et al. Box Isolation of Fibrotic Areas (BIFA): a patient-tailored substrate modified application approach for ablation of atrial fibrillation. J Cardiovasc Electrophysiol. 2016;27:22-30.
7. Stevenson IH, Teichtahl H, Cunnington D, et al. Prevalence of sleep disordered breathing in paroxysmal and persistent atrial fibrillation patients with normal left ventricular function. Eur Heart J. 2008;29:1662-9.
8. Fein AS, Shvilkin A, Shah D, et al. Treatment of obstructive sleep apnea reduces the risk of atrial fibrillation recurrence after catheter ablation. J Am Coll Cardiol. 2013;62:300-5.
9. Naruse Y, Tada H, Satoh M, et al. Concomitant obstructive sleep apnea increases the recurrence of atrial fibrillation following radiofrequency catheter ablation of atrial fibrillation: clinical impact of continuous positive airway pressure therapy. Heart Rhythm. 2013;10:331-7.
10. Otto M, Belohlavek M, Romero-Corral A, et al. Comparison of cardiac structural and functional changes in obese otherwise healthy adults with versus without obstructive sleep apnea. Am J Cardiol. 2007;99:1298-302.
11. Kis Z, Muka T, Franco OH, et al. The short and long-term efficacy of pulmonary vein isolation as a sole treatment strategy for paroxysmal atrial fibrillation: a systematic review and meta-analysis. Curr Cardiol Rev. 2017 Jan 17. [Epub ahead of print].
12. Nakase K, Kollmar R, Lazar J, et al. Laryngospasm, central and obstructive apnea during seizures: defining pathophysiology for sudden death in a rat model. Epilepsy Res. 2016;128:126-39.
Atrial fibrillation (AF) is the most common cardiac arrhythmia encountered in clinical practice and is associated with increased morbidity and mortality due to thromboembolism, stroke, and worsening of pre-existing heart failure. Both its incidence and prevalence are increasing as AF risk increases with advancing age.1 While the strategies of heart rate control and anticoagulation to lower stroke risk and rhythm control have been found comparable with regard to survival, many patients remain highly symptomatic because of palpitations and reduced cardiac output.1
Structural abnormalities of the atria, including fibrosis and dilation, accompanied by conduction abnormalities, provide the underlying substrate for AF. It is well established that AF episodes perpetuate atrial remodeling leading to more frequent and prolonged AF episodes. Hence, there is the long-standing notion that “AF begets AF.” While a variety of antiarrhythmic drugs have been employed over the years to prevent AF recurrences and to maintain sinus rhythm, their use has decreased over the past 2 decades due to their major side effects and their potential of proarrhythmia.
Since AF patients represent a heterogeneous group of patients with CV diseases of varying type and severity as well as comorbidities, it stands to reason that the pulmonary venous–left atrial junction may not be the sole culprit region of all cases of AF and that other anatomical locations might serve as triggers for AF.
In support of this notion are the results of the prospective multicenter study presented by Dr. Elad Anter at the annual International AF Symposium. This important study is consistent with and expands upon prior studies that have suggested that sites within the atria remote from the pulmonary veins may serve as triggers for AF, rather than lower technical success of pulmonary vein ablation.5 It further highlights the importance of fibrosis and associated electrical dispersion to the pathogenesis of AF.6 However, the recommendation that patients with AF be screened for OSA is not new, as nearly half of patients with AF also have OSA.7 While AF and OSA share common risk factors/comorbidities such as male gender, obesity, hypertension, coronary artery disease, and congestive heart failure, OSA has been found to be an independent risk factor for AF development.
It is important to know whether OSA was treated, as the presence of OSA raises the risk of AF recurrence and OSA treatment decreases AF recurrence after ablation.8,9 Conversely, in the setting of OSA, AF is more resistive to rhythm control. Enhanced vagal activation, elevated sympathetic tone, and oxidative stresses due to oxygen desaturation and left atrial distension have all been implicated in the pathogenesis linking OSA to the development of AF. Repeated increases in upper airway resistance during airway obstruction have been shown to lead to atrial stretch, dilation, and fibrosis.10 Since patients with heart failure, coronary artery disease, and other underlying causes for AF were excluded from the onset, the results may not be applicable to a large segment of AF patients. Exclusion of underlying cardiac conditions potentially raised the yield of patients found to have OSA and the potential value of OSA screening. Of note: Less than half of patients that were enrolled had complete data for analysis, which may further limit applicability of the study findings. All patients had paroxysmal AF and were in sinus rhythm while the mapping procedure was performed, leaving questions as to how to approach patients presenting acutely with persistent or long standing AF, or those recently treated with antiarrhythmic therapy. Also, since arrhythmia-free survival decreases from 1 to 5 years after AF ablation, and short-time success rates do not predict longer success rates, the present study results should be interpreted with cautious optimism.11
However, these limitations should not detract from the major implications of the study. In the setting of AF, OSA should be clinically suspected not only because of the frequent coexistence of the two disorders but because the presence of OSA should prompt electrophysiologists to consider non–pulmonary vein triggers of AF prior to ablation attempts. The consideration of alternative ablation sites might help to explain the lack of ablation procedure endpoints to predict long-term success of ablation and holds promise for increasing technical success rates. Given that airway obstruction may occur in other clinical settings such as seizure-induced laryngospasm and that seizures may induce arrhythmias and sudden death, there is potential for non–pulmonary vein sites to trigger AF and other arrhythmias in settings other than OSA as well.12 Whether other disease states are associated with a higher likelihood of non-pulmonary veins trigger sites also merits further study. Moreover, this study underscores the notion that with regard to AF ablation, “no one site fits all” and “clinical mapping” may serve as a valuable adjunct to anatomical mapping. It also serves as a reminder of the multidisciplinary nature of Chest Medicine and the need of a team oriented approach..
References
1. Iwasaki YK, Nishida K, Kato T, Nattel S. Atrial fibrillation pathophysiology: implications for management. Circulation. 2011;124:2264-74.
2. Verma A, Jiang CY, Betts TR, et al. Approaches to catheter ablation for persistent atrial fibrillation. N Engl J Med. 2015;372:1812-22.
3. Kuck KH, Brugada J, Fürnkranz A, et al. Cryoballoon or radiofrequency ablation for paroxysmal atrial fibrillation. N Engl J Med. 2016;374:2235-45.
4. Calkins H, Reynolds MR, Spector P, et al. Treatment of atrial fibrillation with antiarrhythmic drugs or radiofrequency ablation: two systematic literature reviews and meta-analyses. Circ Arrhythm Electrophysiol. 2009;2:349-61.
5. Narayan SM, Krummen DE, Shivkumar K, et al. Treatment of atrial fibrillation by the ablation of localized sources: CONFIRM (Conventional Ablation for Atrial Fibrillation With or Without Focal Impulse and Rotor Modulation) trial. J Am Coll Cardiol. 2012;60:628-36.
6. Kottkamp H, Berg J, Bender R, et al. Box Isolation of Fibrotic Areas (BIFA): a patient-tailored substrate modified application approach for ablation of atrial fibrillation. J Cardiovasc Electrophysiol. 2016;27:22-30.
7. Stevenson IH, Teichtahl H, Cunnington D, et al. Prevalence of sleep disordered breathing in paroxysmal and persistent atrial fibrillation patients with normal left ventricular function. Eur Heart J. 2008;29:1662-9.
8. Fein AS, Shvilkin A, Shah D, et al. Treatment of obstructive sleep apnea reduces the risk of atrial fibrillation recurrence after catheter ablation. J Am Coll Cardiol. 2013;62:300-5.
9. Naruse Y, Tada H, Satoh M, et al. Concomitant obstructive sleep apnea increases the recurrence of atrial fibrillation following radiofrequency catheter ablation of atrial fibrillation: clinical impact of continuous positive airway pressure therapy. Heart Rhythm. 2013;10:331-7.
10. Otto M, Belohlavek M, Romero-Corral A, et al. Comparison of cardiac structural and functional changes in obese otherwise healthy adults with versus without obstructive sleep apnea. Am J Cardiol. 2007;99:1298-302.
11. Kis Z, Muka T, Franco OH, et al. The short and long-term efficacy of pulmonary vein isolation as a sole treatment strategy for paroxysmal atrial fibrillation: a systematic review and meta-analysis. Curr Cardiol Rev. 2017 Jan 17. [Epub ahead of print].
12. Nakase K, Kollmar R, Lazar J, et al. Laryngospasm, central and obstructive apnea during seizures: defining pathophysiology for sudden death in a rat model. Epilepsy Res. 2016;128:126-39.
Atrial fibrillation (AF) is the most common cardiac arrhythmia encountered in clinical practice and is associated with increased morbidity and mortality due to thromboembolism, stroke, and worsening of pre-existing heart failure. Both its incidence and prevalence are increasing as AF risk increases with advancing age.1 While the strategies of heart rate control and anticoagulation to lower stroke risk and rhythm control have been found comparable with regard to survival, many patients remain highly symptomatic because of palpitations and reduced cardiac output.1
Structural abnormalities of the atria, including fibrosis and dilation, accompanied by conduction abnormalities, provide the underlying substrate for AF. It is well established that AF episodes perpetuate atrial remodeling leading to more frequent and prolonged AF episodes. Hence, there is the long-standing notion that “AF begets AF.” While a variety of antiarrhythmic drugs have been employed over the years to prevent AF recurrences and to maintain sinus rhythm, their use has decreased over the past 2 decades due to their major side effects and their potential of proarrhythmia.
Since AF patients represent a heterogeneous group of patients with CV diseases of varying type and severity as well as comorbidities, it stands to reason that the pulmonary venous–left atrial junction may not be the sole culprit region of all cases of AF and that other anatomical locations might serve as triggers for AF.
In support of this notion are the results of the prospective multicenter study presented by Dr. Elad Anter at the annual International AF Symposium. This important study is consistent with and expands upon prior studies that have suggested that sites within the atria remote from the pulmonary veins may serve as triggers for AF, rather than lower technical success of pulmonary vein ablation.5 It further highlights the importance of fibrosis and associated electrical dispersion to the pathogenesis of AF.6 However, the recommendation that patients with AF be screened for OSA is not new, as nearly half of patients with AF also have OSA.7 While AF and OSA share common risk factors/comorbidities such as male gender, obesity, hypertension, coronary artery disease, and congestive heart failure, OSA has been found to be an independent risk factor for AF development.
It is important to know whether OSA was treated, as the presence of OSA raises the risk of AF recurrence and OSA treatment decreases AF recurrence after ablation.8,9 Conversely, in the setting of OSA, AF is more resistive to rhythm control. Enhanced vagal activation, elevated sympathetic tone, and oxidative stresses due to oxygen desaturation and left atrial distension have all been implicated in the pathogenesis linking OSA to the development of AF. Repeated increases in upper airway resistance during airway obstruction have been shown to lead to atrial stretch, dilation, and fibrosis.10 Since patients with heart failure, coronary artery disease, and other underlying causes for AF were excluded from the onset, the results may not be applicable to a large segment of AF patients. Exclusion of underlying cardiac conditions potentially raised the yield of patients found to have OSA and the potential value of OSA screening. Of note: Less than half of patients that were enrolled had complete data for analysis, which may further limit applicability of the study findings. All patients had paroxysmal AF and were in sinus rhythm while the mapping procedure was performed, leaving questions as to how to approach patients presenting acutely with persistent or long standing AF, or those recently treated with antiarrhythmic therapy. Also, since arrhythmia-free survival decreases from 1 to 5 years after AF ablation, and short-time success rates do not predict longer success rates, the present study results should be interpreted with cautious optimism.11
However, these limitations should not detract from the major implications of the study. In the setting of AF, OSA should be clinically suspected not only because of the frequent coexistence of the two disorders but because the presence of OSA should prompt electrophysiologists to consider non–pulmonary vein triggers of AF prior to ablation attempts. The consideration of alternative ablation sites might help to explain the lack of ablation procedure endpoints to predict long-term success of ablation and holds promise for increasing technical success rates. Given that airway obstruction may occur in other clinical settings such as seizure-induced laryngospasm and that seizures may induce arrhythmias and sudden death, there is potential for non–pulmonary vein sites to trigger AF and other arrhythmias in settings other than OSA as well.12 Whether other disease states are associated with a higher likelihood of non-pulmonary veins trigger sites also merits further study. Moreover, this study underscores the notion that with regard to AF ablation, “no one site fits all” and “clinical mapping” may serve as a valuable adjunct to anatomical mapping. It also serves as a reminder of the multidisciplinary nature of Chest Medicine and the need of a team oriented approach..
References
1. Iwasaki YK, Nishida K, Kato T, Nattel S. Atrial fibrillation pathophysiology: implications for management. Circulation. 2011;124:2264-74.
2. Verma A, Jiang CY, Betts TR, et al. Approaches to catheter ablation for persistent atrial fibrillation. N Engl J Med. 2015;372:1812-22.
3. Kuck KH, Brugada J, Fürnkranz A, et al. Cryoballoon or radiofrequency ablation for paroxysmal atrial fibrillation. N Engl J Med. 2016;374:2235-45.
4. Calkins H, Reynolds MR, Spector P, et al. Treatment of atrial fibrillation with antiarrhythmic drugs or radiofrequency ablation: two systematic literature reviews and meta-analyses. Circ Arrhythm Electrophysiol. 2009;2:349-61.
5. Narayan SM, Krummen DE, Shivkumar K, et al. Treatment of atrial fibrillation by the ablation of localized sources: CONFIRM (Conventional Ablation for Atrial Fibrillation With or Without Focal Impulse and Rotor Modulation) trial. J Am Coll Cardiol. 2012;60:628-36.
6. Kottkamp H, Berg J, Bender R, et al. Box Isolation of Fibrotic Areas (BIFA): a patient-tailored substrate modified application approach for ablation of atrial fibrillation. J Cardiovasc Electrophysiol. 2016;27:22-30.
7. Stevenson IH, Teichtahl H, Cunnington D, et al. Prevalence of sleep disordered breathing in paroxysmal and persistent atrial fibrillation patients with normal left ventricular function. Eur Heart J. 2008;29:1662-9.
8. Fein AS, Shvilkin A, Shah D, et al. Treatment of obstructive sleep apnea reduces the risk of atrial fibrillation recurrence after catheter ablation. J Am Coll Cardiol. 2013;62:300-5.
9. Naruse Y, Tada H, Satoh M, et al. Concomitant obstructive sleep apnea increases the recurrence of atrial fibrillation following radiofrequency catheter ablation of atrial fibrillation: clinical impact of continuous positive airway pressure therapy. Heart Rhythm. 2013;10:331-7.
10. Otto M, Belohlavek M, Romero-Corral A, et al. Comparison of cardiac structural and functional changes in obese otherwise healthy adults with versus without obstructive sleep apnea. Am J Cardiol. 2007;99:1298-302.
11. Kis Z, Muka T, Franco OH, et al. The short and long-term efficacy of pulmonary vein isolation as a sole treatment strategy for paroxysmal atrial fibrillation: a systematic review and meta-analysis. Curr Cardiol Rev. 2017 Jan 17. [Epub ahead of print].
12. Nakase K, Kollmar R, Lazar J, et al. Laryngospasm, central and obstructive apnea during seizures: defining pathophysiology for sudden death in a rat model. Epilepsy Res. 2016;128:126-39.
ORLANDO – Patients with atrial fibrillation (AF) should be screened for obstructive sleep apnea (OSA), because this information may be useful in guiding ablation strategies, according to results of a prospective study.
The study, which associated OSA in AF with a high relative rate of non–pulmonary vein (PV) triggers, has contributed to the “growing body of evidence implicating sleep apnea in atrial remodeling and promotion of the AF substrate,” Elad Anter, MD, associate director of the clinical electrophysiology laboratory at Beth Israel Deaconess Medical Center, Boston, reported at the annual International AF Symposium.
Despite the close association between OSA and AF, it has been unclear whether OSA is a causative factor. Dr. Anter suggested that mechanistic association is strengthening, however.
It has been hypothesized that OSA generates AF substrate through negative intrathoracic pressure changes and autonomic nervous system activation. But Dr. Anter reported that there is more recent and compelling evidence that the repetitive occlusions produced by OSA result in remodeling of the atria, producing scar tissue that slows conduction and produces susceptibility to reentry AF.
A newly completed prospective multicenter study adds support to this latter hypothesis. In the protocol, patients with paroxysmal AF scheduled for ablation were required to undergo a sleep study, an AF mapping study, and follow-up for at least 12 months. A known history of OSA was an exclusion criterion. To isolate the effect of OSA, there were exclusions for other major etiologies for AF, such as heart failure or coronary artery disease.
The AF mapping was conducted when patients were in sinus rhythm “to evaluate the baseline atrial substrate and avoid measurements related to acute electrical remodeling,” Dr. Anter explained.
Of 172 patients initially enrolled, 133 completed the sleep study, 118 completed the mapping study, and 110 completed both and were followed for at least 12 months. Of these, 43 patients without OSA were compared with 43 patients with OSA defined as an apnea-hypopnea index (AHI) of at least 15. Patients in the two groups did not differ significantly for relevant characteristics, such as body mass index (BMI), age, presence of hypertension, or duration of AF; but the left atrial (LA) volume was significantly greater (P = .01) in those with OSA than those without.
Even though the prevalence of voltage abnormalities was higher in the OSA group for the right (P = .01) and left atria (P = .0001) before ablation, the prevalence of PV triggers (63% vs. 65%), non-PV triggers (19% vs. 12%) and noninducible triggers (19% vs. 23%) were similar.
After ablation, PV triggers were no longer inducible in either group, but there was a striking difference in inducible non-PV triggers. While only 11.6% remained inducible in the non-OSA group, 41.8% (P = .003) remained inducible in the OSA patients.
“AF triggers in OSA were most commonly located at the LA septum, at the zone of low voltage and abnormal electrograms, as determined during sinus rhythm,” Dr. Anter reported. “Ablation of these triggers at the zone of tissue abnormality in the OSA patients resulted in termination of AF in 9 (64.2%) of the 14 patients.”
Overall, at the end of 12 months, 79% of those without OSA remained in arrhythmia-free survival, versus 65.1% of the group with OSA that were treated with PV isolation alone.
The lower rate of success in the OSA group shows the importance of specifically directing ablation to the areas of low voltage and slow conduction in the left anterior septum that Dr. Anter indicated otherwise would be missed.
“These zones are a common source of extra-PV triggers and localized circuits or rotors of AF in OSA patients,” he reported. “Ablation of these low voltage zones is associated with improved clinical outcome in OSA patients with paroxysmal AF.”
The data, which Dr. Anter said are consistent with a growing body of work regarding the relationship of OSA and AF, provided the basis for suggesting that AF patients undergo routine screening for OSA.
In patients with OSA, ablation of PV triggers alone even in paroxysmal PAF “may not be sufficient,” he cautioned. “Evaluation of non-PV triggers should also be performed.”
Dr. Anter reported financial relationships with Biosense Webster and Boston Scientific.
ORLANDO – Patients with atrial fibrillation (AF) should be screened for obstructive sleep apnea (OSA), because this information may be useful in guiding ablation strategies, according to results of a prospective study.
The study, which associated OSA in AF with a high relative rate of non–pulmonary vein (PV) triggers, has contributed to the “growing body of evidence implicating sleep apnea in atrial remodeling and promotion of the AF substrate,” Elad Anter, MD, associate director of the clinical electrophysiology laboratory at Beth Israel Deaconess Medical Center, Boston, reported at the annual International AF Symposium.
Despite the close association between OSA and AF, it has been unclear whether OSA is a causative factor. Dr. Anter suggested that mechanistic association is strengthening, however.
It has been hypothesized that OSA generates AF substrate through negative intrathoracic pressure changes and autonomic nervous system activation. But Dr. Anter reported that there is more recent and compelling evidence that the repetitive occlusions produced by OSA result in remodeling of the atria, producing scar tissue that slows conduction and produces susceptibility to reentry AF.
A newly completed prospective multicenter study adds support to this latter hypothesis. In the protocol, patients with paroxysmal AF scheduled for ablation were required to undergo a sleep study, an AF mapping study, and follow-up for at least 12 months. A known history of OSA was an exclusion criterion. To isolate the effect of OSA, there were exclusions for other major etiologies for AF, such as heart failure or coronary artery disease.
The AF mapping was conducted when patients were in sinus rhythm “to evaluate the baseline atrial substrate and avoid measurements related to acute electrical remodeling,” Dr. Anter explained.
Of 172 patients initially enrolled, 133 completed the sleep study, 118 completed the mapping study, and 110 completed both and were followed for at least 12 months. Of these, 43 patients without OSA were compared with 43 patients with OSA defined as an apnea-hypopnea index (AHI) of at least 15. Patients in the two groups did not differ significantly for relevant characteristics, such as body mass index (BMI), age, presence of hypertension, or duration of AF; but the left atrial (LA) volume was significantly greater (P = .01) in those with OSA than those without.
Even though the prevalence of voltage abnormalities was higher in the OSA group for the right (P = .01) and left atria (P = .0001) before ablation, the prevalence of PV triggers (63% vs. 65%), non-PV triggers (19% vs. 12%) and noninducible triggers (19% vs. 23%) were similar.
After ablation, PV triggers were no longer inducible in either group, but there was a striking difference in inducible non-PV triggers. While only 11.6% remained inducible in the non-OSA group, 41.8% (P = .003) remained inducible in the OSA patients.
“AF triggers in OSA were most commonly located at the LA septum, at the zone of low voltage and abnormal electrograms, as determined during sinus rhythm,” Dr. Anter reported. “Ablation of these triggers at the zone of tissue abnormality in the OSA patients resulted in termination of AF in 9 (64.2%) of the 14 patients.”
Overall, at the end of 12 months, 79% of those without OSA remained in arrhythmia-free survival, versus 65.1% of the group with OSA that were treated with PV isolation alone.
The lower rate of success in the OSA group shows the importance of specifically directing ablation to the areas of low voltage and slow conduction in the left anterior septum that Dr. Anter indicated otherwise would be missed.
“These zones are a common source of extra-PV triggers and localized circuits or rotors of AF in OSA patients,” he reported. “Ablation of these low voltage zones is associated with improved clinical outcome in OSA patients with paroxysmal AF.”
The data, which Dr. Anter said are consistent with a growing body of work regarding the relationship of OSA and AF, provided the basis for suggesting that AF patients undergo routine screening for OSA.
In patients with OSA, ablation of PV triggers alone even in paroxysmal PAF “may not be sufficient,” he cautioned. “Evaluation of non-PV triggers should also be performed.”
Dr. Anter reported financial relationships with Biosense Webster and Boston Scientific.
Key clinical point: Atrial fibrillation associated with sleep apnea appears to have features that should be addressed specifically for sustained rhythm control.
Major finding: AF patients with sleep apnea have more non–pulmonary vein triggers after ablation than do those without sleep apnea (41.8% vs. 11.6%).
Data source: A prospective multicenter observational study.
Disclosures: Dr. Anter reported financial relationships with Biosense Webster and Boston Scientific.
USPSTF punts on sleep apnea screening
because the current evidence is inadequate to assess the benefits and harms of doing so, according to a Recommendation Statement published online Jan. 23 in JAMA.
The USPSTF makes recommendations about the effectiveness of specific health care services for patients who don’t have related signs or symptoms. In this case, the Recommendation Statement addresses adults who don’t snore excessively; gasp or choke while sleeping; or report the daytime sleepiness, impaired cognition, or mood changes typically associated with obstructive sleep apnea, said Kirsten Bobbins-Domingo, PhD, MD, chair of the organization and lead author of the Recommendation Statement, and her associates (JAMA 2017 Jan 23. doi: 10.1001/jama.2016.20325).
The USPSTF commissioned a comprehensive review of the literature to examine whether screening such patients by primary caregivers would effectively identify those who have obstructive sleep apnea and lead to treatment that would prevent the elevated rates of death, cognitive impairment, motor vehicle crashes, cardiovascular events, and cerebrovascular events related to the disorder. Daniel E. Jonas, MD, of the University of North Carolina at Chapel Hill and his associates reviewed 110 relevant studies involving 46,188 participants.
They found that the accuracy and clinical utility of numerous OSA screening tools was uncertain. In particular, the Epworth Sleepiness Scale, the STOP (Snoring, Tiredness, Observed Apnea, and High Blood Pressure) questionnaire, the STOP-BANG (STOP plus BMI, Age, Neck Circumference, and Gender) questionnaire, the Berlin Questionnaire, the Wisconsin Sleep Questionnaire, and the Multivariable Apnea Prediction (MVAP) tool have not been adequately validated in primary care settings.
Moreover, no studies directly assessed whether screening had an impact on actual health outcomes. Several treatments, notably CPAP and mandibular advancement devices, did improve intermediate outcomes such as scores on the apnea-hypopnea index, scores on the Epworth Sleepiness Scale, and blood pressure levels, but the evidence did not show that this in turn improved mortality, cardiovascular events, or the other “hard” outcomes of interest, Dr. Jonas and his associates said in their Evidence Report (JAMA 2017 Jan 23. doi: 10.1001/jama.2016.19635).
Dr. Bobbins-Domingo and her associates on the task force noted that this Recommendation Statement is consistent with that of the American Academy of Family Physicians, which also concluded that the current evidence is insufficient to assess the balance of benefits and harms of screening asymptomatic adults for obstructive sleep apnea.
The American College of Physicians offers a “weak” recommendation based on low-quality evidence that patients with unexplained daytime sleepiness and patients suspected of having apnea undergo a sleep study, said Dr. Bobbins-Domingo, professor of medicine at the University of California, San Francisco, and her associates.
In contrast, the American Academy of Sleep Medicine recommends that routine health visits should include questions about OSA and evaluation of risk factors such as obesity, retrognathia, and treatment-refractory hypertension. If there are positive findings, a comprehensive sleep evaluation should follow, according to the AASM.
The USPSTF is an independent voluntary group supported by the Agency for Healthcare Research and Quality as mandated by the U.S. Congress. The authors’ conflict of interest disclosures are available at www.uspreventiveservicestaskforce.org.
This recommendation must not be misinterpreted. If clinicians are discouraged from directly questioning patients about apnea signs and symptoms or from using short screening questionnaires to identify those at high risk for the disorder, it would negatively influence public health.
Susan Redline, MD, is at the Sleep Health Institute and in the Division of Sleep and Circadian Disorders at Brigham and Women’s Hospital and Harvard Medical School and Beth Israel Deaconess Medical Center, all in Boston. She reported ties to Jazz Pharmaceuticals, RosMed Inc., and the Beckman Company, as well as serving on the American Academy of Sleep Medicine’s board of directors. Dr. Redline made these remarks in an editorial accompanying the USPSTF reports (JAMA 2017;317:368-70).
This recommendation must not be misinterpreted. If clinicians are discouraged from directly questioning patients about apnea signs and symptoms or from using short screening questionnaires to identify those at high risk for the disorder, it would negatively influence public health.
Susan Redline, MD, is at the Sleep Health Institute and in the Division of Sleep and Circadian Disorders at Brigham and Women’s Hospital and Harvard Medical School and Beth Israel Deaconess Medical Center, all in Boston. She reported ties to Jazz Pharmaceuticals, RosMed Inc., and the Beckman Company, as well as serving on the American Academy of Sleep Medicine’s board of directors. Dr. Redline made these remarks in an editorial accompanying the USPSTF reports (JAMA 2017;317:368-70).
This recommendation must not be misinterpreted. If clinicians are discouraged from directly questioning patients about apnea signs and symptoms or from using short screening questionnaires to identify those at high risk for the disorder, it would negatively influence public health.
Susan Redline, MD, is at the Sleep Health Institute and in the Division of Sleep and Circadian Disorders at Brigham and Women’s Hospital and Harvard Medical School and Beth Israel Deaconess Medical Center, all in Boston. She reported ties to Jazz Pharmaceuticals, RosMed Inc., and the Beckman Company, as well as serving on the American Academy of Sleep Medicine’s board of directors. Dr. Redline made these remarks in an editorial accompanying the USPSTF reports (JAMA 2017;317:368-70).
because the current evidence is inadequate to assess the benefits and harms of doing so, according to a Recommendation Statement published online Jan. 23 in JAMA.
The USPSTF makes recommendations about the effectiveness of specific health care services for patients who don’t have related signs or symptoms. In this case, the Recommendation Statement addresses adults who don’t snore excessively; gasp or choke while sleeping; or report the daytime sleepiness, impaired cognition, or mood changes typically associated with obstructive sleep apnea, said Kirsten Bobbins-Domingo, PhD, MD, chair of the organization and lead author of the Recommendation Statement, and her associates (JAMA 2017 Jan 23. doi: 10.1001/jama.2016.20325).
The USPSTF commissioned a comprehensive review of the literature to examine whether screening such patients by primary caregivers would effectively identify those who have obstructive sleep apnea and lead to treatment that would prevent the elevated rates of death, cognitive impairment, motor vehicle crashes, cardiovascular events, and cerebrovascular events related to the disorder. Daniel E. Jonas, MD, of the University of North Carolina at Chapel Hill and his associates reviewed 110 relevant studies involving 46,188 participants.
They found that the accuracy and clinical utility of numerous OSA screening tools was uncertain. In particular, the Epworth Sleepiness Scale, the STOP (Snoring, Tiredness, Observed Apnea, and High Blood Pressure) questionnaire, the STOP-BANG (STOP plus BMI, Age, Neck Circumference, and Gender) questionnaire, the Berlin Questionnaire, the Wisconsin Sleep Questionnaire, and the Multivariable Apnea Prediction (MVAP) tool have not been adequately validated in primary care settings.
Moreover, no studies directly assessed whether screening had an impact on actual health outcomes. Several treatments, notably CPAP and mandibular advancement devices, did improve intermediate outcomes such as scores on the apnea-hypopnea index, scores on the Epworth Sleepiness Scale, and blood pressure levels, but the evidence did not show that this in turn improved mortality, cardiovascular events, or the other “hard” outcomes of interest, Dr. Jonas and his associates said in their Evidence Report (JAMA 2017 Jan 23. doi: 10.1001/jama.2016.19635).
Dr. Bobbins-Domingo and her associates on the task force noted that this Recommendation Statement is consistent with that of the American Academy of Family Physicians, which also concluded that the current evidence is insufficient to assess the balance of benefits and harms of screening asymptomatic adults for obstructive sleep apnea.
The American College of Physicians offers a “weak” recommendation based on low-quality evidence that patients with unexplained daytime sleepiness and patients suspected of having apnea undergo a sleep study, said Dr. Bobbins-Domingo, professor of medicine at the University of California, San Francisco, and her associates.
In contrast, the American Academy of Sleep Medicine recommends that routine health visits should include questions about OSA and evaluation of risk factors such as obesity, retrognathia, and treatment-refractory hypertension. If there are positive findings, a comprehensive sleep evaluation should follow, according to the AASM.
The USPSTF is an independent voluntary group supported by the Agency for Healthcare Research and Quality as mandated by the U.S. Congress. The authors’ conflict of interest disclosures are available at www.uspreventiveservicestaskforce.org.
because the current evidence is inadequate to assess the benefits and harms of doing so, according to a Recommendation Statement published online Jan. 23 in JAMA.
The USPSTF makes recommendations about the effectiveness of specific health care services for patients who don’t have related signs or symptoms. In this case, the Recommendation Statement addresses adults who don’t snore excessively; gasp or choke while sleeping; or report the daytime sleepiness, impaired cognition, or mood changes typically associated with obstructive sleep apnea, said Kirsten Bobbins-Domingo, PhD, MD, chair of the organization and lead author of the Recommendation Statement, and her associates (JAMA 2017 Jan 23. doi: 10.1001/jama.2016.20325).
The USPSTF commissioned a comprehensive review of the literature to examine whether screening such patients by primary caregivers would effectively identify those who have obstructive sleep apnea and lead to treatment that would prevent the elevated rates of death, cognitive impairment, motor vehicle crashes, cardiovascular events, and cerebrovascular events related to the disorder. Daniel E. Jonas, MD, of the University of North Carolina at Chapel Hill and his associates reviewed 110 relevant studies involving 46,188 participants.
They found that the accuracy and clinical utility of numerous OSA screening tools was uncertain. In particular, the Epworth Sleepiness Scale, the STOP (Snoring, Tiredness, Observed Apnea, and High Blood Pressure) questionnaire, the STOP-BANG (STOP plus BMI, Age, Neck Circumference, and Gender) questionnaire, the Berlin Questionnaire, the Wisconsin Sleep Questionnaire, and the Multivariable Apnea Prediction (MVAP) tool have not been adequately validated in primary care settings.
Moreover, no studies directly assessed whether screening had an impact on actual health outcomes. Several treatments, notably CPAP and mandibular advancement devices, did improve intermediate outcomes such as scores on the apnea-hypopnea index, scores on the Epworth Sleepiness Scale, and blood pressure levels, but the evidence did not show that this in turn improved mortality, cardiovascular events, or the other “hard” outcomes of interest, Dr. Jonas and his associates said in their Evidence Report (JAMA 2017 Jan 23. doi: 10.1001/jama.2016.19635).
Dr. Bobbins-Domingo and her associates on the task force noted that this Recommendation Statement is consistent with that of the American Academy of Family Physicians, which also concluded that the current evidence is insufficient to assess the balance of benefits and harms of screening asymptomatic adults for obstructive sleep apnea.
The American College of Physicians offers a “weak” recommendation based on low-quality evidence that patients with unexplained daytime sleepiness and patients suspected of having apnea undergo a sleep study, said Dr. Bobbins-Domingo, professor of medicine at the University of California, San Francisco, and her associates.
In contrast, the American Academy of Sleep Medicine recommends that routine health visits should include questions about OSA and evaluation of risk factors such as obesity, retrognathia, and treatment-refractory hypertension. If there are positive findings, a comprehensive sleep evaluation should follow, according to the AASM.
The USPSTF is an independent voluntary group supported by the Agency for Healthcare Research and Quality as mandated by the U.S. Congress. The authors’ conflict of interest disclosures are available at www.uspreventiveservicestaskforce.org.
FROM JAMA
Cardiac events after NSCLC radiotherapy occur early
Cardiac events are “relatively common,” affecting 23% of patients, and occur earlier than previously thought following radiotherapy for non–small-cell lung cancer (NSCLC), according to a report in the Journal of Clinical Oncology.
Radiation-associated cardiac toxicity has long been recognized in patients treated for other thoracic cancers, but the conventional wisdom has been that it isn’t a consideration in patients with stage III NSCLC because “there are few long-term survivors to experience toxicity, given the typically long latency of radiotherapy-associated heart injury and the poor prognosis” of this cancer. However, the findings “challenge the perception that minimizing heart dose is not important in the treatment of patients with stage III NSCLC,” said Kyle Wang, MD, of University of North Carolina Hospitals, Chapel Hill, and his associates.
“Our data support minimization of heart radiation exposure whenever possible to doses lower than commonly recommended in patients with stage III NSCLC, to reduce risks of [cardiac] toxicity,” they noted.
Dr. Wang and his associates performed a retrospective post hoc analysis of data pooled from six prospective phase I and II trials that the University of North Carolina was involved in between 1996 and 2009. The studies assessed both dose-escalated radiotherapy and various chemotherapeutic regimens in 112 patients who were followed for a median of 8.8 years (range, 2.3-17.3 years). All the patients received induction chemotherapy, 90% received concurrent chemotherapy, and 25% received consolidation chemotherapy.
A total of 26 patients (23%) had at least one symptomatic cardiac event following radiotherapy: pericardial effusion (7 patients), MI (5 patients), unstable angina (3 patients), pericarditis (2 patients), significant arrhythmia (12 patients), and heart failure (1 patient). After the data were adjusted to account for competing risks of death, the 2-year rate of symptomatic cardiac toxicity was 10% and the 4-year rate was 18%. The first adverse cardiac event occurred at a median of 26 months (range, 1-84 months).
The risk of cardiac toxicities rose with increasing radiation exposure: At 2 years, the rate of cardiac events was 4% for those exposed to less than 10 Gy, 7% for those exposed to 10-20 Gy, and 21% for those exposed to greater than 20 Gy. At 4 years, those rates were 4%, 13%, and 41%, respectively. Patients whose hearts were exposed to greater than 20 Gy had a significantly higher rate of cardiac events than did those exposed to less than 10 Gy (HR, 5.47) or to 10-20 Gy (HR, 2.76).
Even though the prognosis may be poor in patients with stage III NSCLC, “they generally receive higher heart doses and may also have more comorbidities and smoking history, thus increasing risk and perhaps shortening the latency between radiotherapy and resultant heart disease,” Dr. Wang and his associates said (J Clin Oncol. 2017 Jan 23 [doi: 10.1200/JCO.2016.70.0229]).
“In our opinion, tumor coverage should rarely be compromised to meet a heart dose constraint. However, it would be reasonable to try to limit heart mean dose to less than 20 Gy (lower if possible) on the basis of the high event rate we observed in patients exceeding this dose (21% at 2 years and 41% at 4 years). Sophisticated radiation treatment planning techniques (e.g., [intensity-modulated radiation therapy]) and charged-particle therapy with protons or carbon ions may provide increased flexibility to generate more conformal treatment plans and reduce heart dose, which could potentially improve the clinical outcomes in patients with stage III NSCLC,” they added.
This is the first report to clearly associate radiation doses with clinically significant cardiac events in patients with locally advanced NSCLC treated with modern radiotherapy techniques, and it suggests that these events happen much earlier than conventionally believed.
Perhaps cardiac risk didn’t matter so much when, historically, the life expectancy of this patient population was only 2 years. But given the improvements in survival over the last 2 decades, together with the findings of Wang et al., the era of indiscriminate irradiation to the heart should end.
Charles B. Simone II, MD, is at the University of Maryland Medical Center, Baltimore. He reported having no relevant financial disclosures. Dr. Simone made these remarks in an editorial accompanying Dr. Wang’s report (J Clin Oncol. 2017 January 23 [doi: 10.1200/JCO.2016.71.5581]).
This is the first report to clearly associate radiation doses with clinically significant cardiac events in patients with locally advanced NSCLC treated with modern radiotherapy techniques, and it suggests that these events happen much earlier than conventionally believed.
Perhaps cardiac risk didn’t matter so much when, historically, the life expectancy of this patient population was only 2 years. But given the improvements in survival over the last 2 decades, together with the findings of Wang et al., the era of indiscriminate irradiation to the heart should end.
Charles B. Simone II, MD, is at the University of Maryland Medical Center, Baltimore. He reported having no relevant financial disclosures. Dr. Simone made these remarks in an editorial accompanying Dr. Wang’s report (J Clin Oncol. 2017 January 23 [doi: 10.1200/JCO.2016.71.5581]).
This is the first report to clearly associate radiation doses with clinically significant cardiac events in patients with locally advanced NSCLC treated with modern radiotherapy techniques, and it suggests that these events happen much earlier than conventionally believed.
Perhaps cardiac risk didn’t matter so much when, historically, the life expectancy of this patient population was only 2 years. But given the improvements in survival over the last 2 decades, together with the findings of Wang et al., the era of indiscriminate irradiation to the heart should end.
Charles B. Simone II, MD, is at the University of Maryland Medical Center, Baltimore. He reported having no relevant financial disclosures. Dr. Simone made these remarks in an editorial accompanying Dr. Wang’s report (J Clin Oncol. 2017 January 23 [doi: 10.1200/JCO.2016.71.5581]).
Cardiac events are “relatively common,” affecting 23% of patients, and occur earlier than previously thought following radiotherapy for non–small-cell lung cancer (NSCLC), according to a report in the Journal of Clinical Oncology.
Radiation-associated cardiac toxicity has long been recognized in patients treated for other thoracic cancers, but the conventional wisdom has been that it isn’t a consideration in patients with stage III NSCLC because “there are few long-term survivors to experience toxicity, given the typically long latency of radiotherapy-associated heart injury and the poor prognosis” of this cancer. However, the findings “challenge the perception that minimizing heart dose is not important in the treatment of patients with stage III NSCLC,” said Kyle Wang, MD, of University of North Carolina Hospitals, Chapel Hill, and his associates.
“Our data support minimization of heart radiation exposure whenever possible to doses lower than commonly recommended in patients with stage III NSCLC, to reduce risks of [cardiac] toxicity,” they noted.
Dr. Wang and his associates performed a retrospective post hoc analysis of data pooled from six prospective phase I and II trials that the University of North Carolina was involved in between 1996 and 2009. The studies assessed both dose-escalated radiotherapy and various chemotherapeutic regimens in 112 patients who were followed for a median of 8.8 years (range, 2.3-17.3 years). All the patients received induction chemotherapy, 90% received concurrent chemotherapy, and 25% received consolidation chemotherapy.
A total of 26 patients (23%) had at least one symptomatic cardiac event following radiotherapy: pericardial effusion (7 patients), MI (5 patients), unstable angina (3 patients), pericarditis (2 patients), significant arrhythmia (12 patients), and heart failure (1 patient). After the data were adjusted to account for competing risks of death, the 2-year rate of symptomatic cardiac toxicity was 10% and the 4-year rate was 18%. The first adverse cardiac event occurred at a median of 26 months (range, 1-84 months).
The risk of cardiac toxicities rose with increasing radiation exposure: At 2 years, the rate of cardiac events was 4% for those exposed to less than 10 Gy, 7% for those exposed to 10-20 Gy, and 21% for those exposed to greater than 20 Gy. At 4 years, those rates were 4%, 13%, and 41%, respectively. Patients whose hearts were exposed to greater than 20 Gy had a significantly higher rate of cardiac events than did those exposed to less than 10 Gy (HR, 5.47) or to 10-20 Gy (HR, 2.76).
Even though the prognosis may be poor in patients with stage III NSCLC, “they generally receive higher heart doses and may also have more comorbidities and smoking history, thus increasing risk and perhaps shortening the latency between radiotherapy and resultant heart disease,” Dr. Wang and his associates said (J Clin Oncol. 2017 Jan 23 [doi: 10.1200/JCO.2016.70.0229]).
“In our opinion, tumor coverage should rarely be compromised to meet a heart dose constraint. However, it would be reasonable to try to limit heart mean dose to less than 20 Gy (lower if possible) on the basis of the high event rate we observed in patients exceeding this dose (21% at 2 years and 41% at 4 years). Sophisticated radiation treatment planning techniques (e.g., [intensity-modulated radiation therapy]) and charged-particle therapy with protons or carbon ions may provide increased flexibility to generate more conformal treatment plans and reduce heart dose, which could potentially improve the clinical outcomes in patients with stage III NSCLC,” they added.
Cardiac events are “relatively common,” affecting 23% of patients, and occur earlier than previously thought following radiotherapy for non–small-cell lung cancer (NSCLC), according to a report in the Journal of Clinical Oncology.
Radiation-associated cardiac toxicity has long been recognized in patients treated for other thoracic cancers, but the conventional wisdom has been that it isn’t a consideration in patients with stage III NSCLC because “there are few long-term survivors to experience toxicity, given the typically long latency of radiotherapy-associated heart injury and the poor prognosis” of this cancer. However, the findings “challenge the perception that minimizing heart dose is not important in the treatment of patients with stage III NSCLC,” said Kyle Wang, MD, of University of North Carolina Hospitals, Chapel Hill, and his associates.
“Our data support minimization of heart radiation exposure whenever possible to doses lower than commonly recommended in patients with stage III NSCLC, to reduce risks of [cardiac] toxicity,” they noted.
Dr. Wang and his associates performed a retrospective post hoc analysis of data pooled from six prospective phase I and II trials that the University of North Carolina was involved in between 1996 and 2009. The studies assessed both dose-escalated radiotherapy and various chemotherapeutic regimens in 112 patients who were followed for a median of 8.8 years (range, 2.3-17.3 years). All the patients received induction chemotherapy, 90% received concurrent chemotherapy, and 25% received consolidation chemotherapy.
A total of 26 patients (23%) had at least one symptomatic cardiac event following radiotherapy: pericardial effusion (7 patients), MI (5 patients), unstable angina (3 patients), pericarditis (2 patients), significant arrhythmia (12 patients), and heart failure (1 patient). After the data were adjusted to account for competing risks of death, the 2-year rate of symptomatic cardiac toxicity was 10% and the 4-year rate was 18%. The first adverse cardiac event occurred at a median of 26 months (range, 1-84 months).
The risk of cardiac toxicities rose with increasing radiation exposure: At 2 years, the rate of cardiac events was 4% for those exposed to less than 10 Gy, 7% for those exposed to 10-20 Gy, and 21% for those exposed to greater than 20 Gy. At 4 years, those rates were 4%, 13%, and 41%, respectively. Patients whose hearts were exposed to greater than 20 Gy had a significantly higher rate of cardiac events than did those exposed to less than 10 Gy (HR, 5.47) or to 10-20 Gy (HR, 2.76).
Even though the prognosis may be poor in patients with stage III NSCLC, “they generally receive higher heart doses and may also have more comorbidities and smoking history, thus increasing risk and perhaps shortening the latency between radiotherapy and resultant heart disease,” Dr. Wang and his associates said (J Clin Oncol. 2017 Jan 23 [doi: 10.1200/JCO.2016.70.0229]).
“In our opinion, tumor coverage should rarely be compromised to meet a heart dose constraint. However, it would be reasonable to try to limit heart mean dose to less than 20 Gy (lower if possible) on the basis of the high event rate we observed in patients exceeding this dose (21% at 2 years and 41% at 4 years). Sophisticated radiation treatment planning techniques (e.g., [intensity-modulated radiation therapy]) and charged-particle therapy with protons or carbon ions may provide increased flexibility to generate more conformal treatment plans and reduce heart dose, which could potentially improve the clinical outcomes in patients with stage III NSCLC,” they added.
FROM JOURNAL OF CLINICAL ONCOLOGY
Key clinical point: Cardiac events are “relatively common” and occur earlier than previously thought following radiotherapy for NSCLC.
Major finding: Following radiotherapy, 26 of 112 patients (23%) had at least one symptomatic cardiac event: pericardial effusion (7 patients), MI (5 patients), unstable angina (3 patients), pericarditis (2 patients), significant arrhythmia (12 patients), and heart failure (1 patient).
Data source: A retrospective post hoc analysis of data from six phase I and II trials involving 112 patients who received radiotherapy for stage-III NSCLC during 1996-2009.
Disclosures: This study was supported in part by the National Institutes of Health. Dr. Wang reported having no relevant financial disclosures; his associates disclosed ties to La Jolla Pharmaceutical, Vision RT, Medtronic, Novartis, Elekta, Morphomics, Accuray, and Varian Medical Systems.
Age and disease stage predict long-term survival in elderly lung cancer patients
AT THE STS ANNUAL MEETING
HOUSTON – Although certain medical factors predict long-term survival in patients over age 65 years with lung cancer, advanced age and disease stage are especially strong predictors, results from a large analysis of national data demonstrated.
The findings, which were presented by Mark Onaitis, MD, at the annual meeting of the Society of Thoracic Surgeons, come from a novel effort to pair Medicare data with files from the STS General Thoracic Surgery Database (GTSD).
For the current study, he and his associates linked GTSD data to Medicare data on 29,899 patients who underwent lung cancer resection from 2002 to 2013. They used Cox proportional hazards modeling to create a long-term survival model and used statistically significant univariate factors and known clinical predictors of outcome to perform variable selection.
Dr. Onaitis reported that the median age of patients was 73 years and that 52% were female. Of the 29,899 patients, 805 had a missing pathologic stage. Of the 29,094 patients not missing a pathologic stage, 69% were stage I, 18% stage II, 11% stage III, and 2% stage IV. Two-thirds of patients (66%) underwent lobectomy, followed by wedge resection (17%), segmentectomy (7%), bilobectomy (3%), pneumonectomy (3%), and sleeve lobectomy (1%). A thoracoscopic approach was performed in nearly half of resections (47%).
Cox analysis revealed the following strong negative predictors of long-term survival: having stage III or IV-V disease (hazard ratio, 1.23 and 1.37, respectively), being age 70-74 (HR, 1.19), 75-80 (HR, 1.40), or 80 and older (HR, 1.90).
After controlling for disease stage, the following procedures were associated with increased hazard of death, compared with lobectomy: wedge resection (HR, 1.22), segmentectomy (HR, 1.10), bilobectomy (HR, 1.30), and pneumonectomy (HR, 1.58). In addition, video-assisted thoracoscopic surgery was associated with improved long-term survival, compared with thoracotomy (HR, 0.86).
“Given the large number of patients and the excellent quality of the data, it was not surprising that age and stage and known medical conditions affect long-term survival,” Dr. Onaitis commented. “The deleterious effects of sublobar operations and open [as opposed to thoracoscopic or VATS] approach were more pronounced than expected.”
Other modifiable predictive factors include being a past or current smoker (HR, 1.35 and HR, 1.54, respectively) and having a body mass index below 18.5 kg/m2 (HR, 1.58).
Dr. Onaitis acknowledged certain limitations of the study, including its retrospective design. “Because the study involves linkage of STS data to Medicare data, the findings may not be applicable to patients less than 65 years of age,” he added. He reported having no financial disclosures.
AT THE STS ANNUAL MEETING
HOUSTON – Although certain medical factors predict long-term survival in patients over age 65 years with lung cancer, advanced age and disease stage are especially strong predictors, results from a large analysis of national data demonstrated.
The findings, which were presented by Mark Onaitis, MD, at the annual meeting of the Society of Thoracic Surgeons, come from a novel effort to pair Medicare data with files from the STS General Thoracic Surgery Database (GTSD).
For the current study, he and his associates linked GTSD data to Medicare data on 29,899 patients who underwent lung cancer resection from 2002 to 2013. They used Cox proportional hazards modeling to create a long-term survival model and used statistically significant univariate factors and known clinical predictors of outcome to perform variable selection.
Dr. Onaitis reported that the median age of patients was 73 years and that 52% were female. Of the 29,899 patients, 805 had a missing pathologic stage. Of the 29,094 patients not missing a pathologic stage, 69% were stage I, 18% stage II, 11% stage III, and 2% stage IV. Two-thirds of patients (66%) underwent lobectomy, followed by wedge resection (17%), segmentectomy (7%), bilobectomy (3%), pneumonectomy (3%), and sleeve lobectomy (1%). A thoracoscopic approach was performed in nearly half of resections (47%).
Cox analysis revealed the following strong negative predictors of long-term survival: having stage III or IV-V disease (hazard ratio, 1.23 and 1.37, respectively), being age 70-74 (HR, 1.19), 75-80 (HR, 1.40), or 80 and older (HR, 1.90).
After controlling for disease stage, the following procedures were associated with increased hazard of death, compared with lobectomy: wedge resection (HR, 1.22), segmentectomy (HR, 1.10), bilobectomy (HR, 1.30), and pneumonectomy (HR, 1.58). In addition, video-assisted thoracoscopic surgery was associated with improved long-term survival, compared with thoracotomy (HR, 0.86).
“Given the large number of patients and the excellent quality of the data, it was not surprising that age and stage and known medical conditions affect long-term survival,” Dr. Onaitis commented. “The deleterious effects of sublobar operations and open [as opposed to thoracoscopic or VATS] approach were more pronounced than expected.”
Other modifiable predictive factors include being a past or current smoker (HR, 1.35 and HR, 1.54, respectively) and having a body mass index below 18.5 kg/m2 (HR, 1.58).
Dr. Onaitis acknowledged certain limitations of the study, including its retrospective design. “Because the study involves linkage of STS data to Medicare data, the findings may not be applicable to patients less than 65 years of age,” he added. He reported having no financial disclosures.
AT THE STS ANNUAL MEETING
HOUSTON – Although certain medical factors predict long-term survival in patients over age 65 years with lung cancer, advanced age and disease stage are especially strong predictors, results from a large analysis of national data demonstrated.
The findings, which were presented by Mark Onaitis, MD, at the annual meeting of the Society of Thoracic Surgeons, come from a novel effort to pair Medicare data with files from the STS General Thoracic Surgery Database (GTSD).
For the current study, he and his associates linked GTSD data to Medicare data on 29,899 patients who underwent lung cancer resection from 2002 to 2013. They used Cox proportional hazards modeling to create a long-term survival model and used statistically significant univariate factors and known clinical predictors of outcome to perform variable selection.
Dr. Onaitis reported that the median age of patients was 73 years and that 52% were female. Of the 29,899 patients, 805 had a missing pathologic stage. Of the 29,094 patients not missing a pathologic stage, 69% were stage I, 18% stage II, 11% stage III, and 2% stage IV. Two-thirds of patients (66%) underwent lobectomy, followed by wedge resection (17%), segmentectomy (7%), bilobectomy (3%), pneumonectomy (3%), and sleeve lobectomy (1%). A thoracoscopic approach was performed in nearly half of resections (47%).
Cox analysis revealed the following strong negative predictors of long-term survival: having stage III or IV-V disease (hazard ratio, 1.23 and 1.37, respectively), being age 70-74 (HR, 1.19), 75-80 (HR, 1.40), or 80 and older (HR, 1.90).
After controlling for disease stage, the following procedures were associated with increased hazard of death, compared with lobectomy: wedge resection (HR, 1.22), segmentectomy (HR, 1.10), bilobectomy (HR, 1.30), and pneumonectomy (HR, 1.58). In addition, video-assisted thoracoscopic surgery was associated with improved long-term survival, compared with thoracotomy (HR, 0.86).
“Given the large number of patients and the excellent quality of the data, it was not surprising that age and stage and known medical conditions affect long-term survival,” Dr. Onaitis commented. “The deleterious effects of sublobar operations and open [as opposed to thoracoscopic or VATS] approach were more pronounced than expected.”
Other modifiable predictive factors include being a past or current smoker (HR, 1.35 and HR, 1.54, respectively) and having a body mass index below 18.5 kg/m2 (HR, 1.58).
Dr. Onaitis acknowledged certain limitations of the study, including its retrospective design. “Because the study involves linkage of STS data to Medicare data, the findings may not be applicable to patients less than 65 years of age,” he added. He reported having no financial disclosures.
Key clinical point:
Major finding: Strong negative predictors of long-term survival included having stage III or IV-V disease (HR, 1.23 and 1.37, respectively), being age 70-74 (HR, 1.19), 75-80 (HR, 1.40), or 80 and older (HR, 1.90).
Data source: A retrospective analysis of 29,899 patients over age 65 who underwent lung cancer resection from 2002 to 2013.
Disclosures: Dr. Onaitis reported having no financial disclosures.
Sleeve lobectomy appears better than pneumonectomy for NSCLC
Guidelines that recommend sleeve lobectomy as a means of avoiding pneumonectomy for lung cancer have been based on a limited retrospective series, but a large series drawn from a nationwide database in France has confirmed the preference for sleeve lobectomy because it leads to higher rates of survival, despite an increased risk of postoperative pulmonary complications.
“Whenever it is technically possible, surgeons must perform sleeve lobectomy to provide more long-term survival benefits to patients, even with the risk of more postoperative pulmonary complications,” said Pierre-Benoit Pagès, MD, PhD, and his coauthors in the January 2017 issue of the Journal of Thoracic and Cardiovascular Surgery (2017;153:184-95). Dr. Pagès is with the department of thoracic and cardiovascular surgery at the University Hospital Center Dijon (France) and Bocage Hospital.
Three-year overall survival was 71.9% for the sleeve lobectomy group vs. 60.8% for the pneumonectomy group. Three-year disease-free survival was 46.4% for the sleeve lobectomy group and 31.6% for the pneumonectomy group. In addition, compared with the sleeve lobectomy group, the pneumonectomy group had an increased risk of recurrence by matching (hazard ratio, 1.49; 95% CI, 1.1-2).
The researchers performed a propensity-matched analysis that favored sleeve lobectomy for early overall and disease-free survival, but the weighted analysis did not. Patients in the sleeve lobectomy group vs. the pneumonectomy group were younger (60.9 years vs. 61.9), had higher body mass index (25.6 vs. 25.1), had higher average forced expiratory volume (74.1% vs. 62.9%), and had lower American Society of Anesthesiologists scores (73.7% with scores of 1 and 2 vs. 70.8%). Sleeve lobectomy patients also were more likely to have right-sided surgery (69.6% vs. 41%) and squamous cell carcinoma (54.6% vs. 48.3%), and lower T and N stages (T1 and T2, 60.5% vs. 40.6%; N0, 40.9% vs. 26.2%).
Overall mortality after surgery was 5% in the sleeve lobectomy group vs. 5.9% in the pneumonectomy group, but propensity scoring showed far fewer postoperative pulmonary complications in the pneumonectomy group, with an odds ratio of 0.4, Dr. Pagès and his coauthors said. However, with other significant complications – arrhythmia, bronchopleural fistula, empyema, and hemorrhage – pneumonectomy had a propensity-matched odds ratio ranging from 1.6 to 7. “We found no significant difference regarding postoperative mortality in the sleeve lobectomy and pneumonectomy groups, whatever the statistical method used,” Dr. Pagès and his coauthors wrote.
The investigators had no financial relationships to disclose.
The study by Dr. Pagès and his colleagues is unique in the field of surgery for non–small cell lung cancer in that it drew on a nationwide database using data from 103 centers, Betty C. Tong, MD, MHS, of Duke University Medical Center, Durham, said in her invited commentary (J Thorac Cardiovasc Surg. 2017;153:196). “These results are likely as close to real life as possible,” she said.
She acknowledged that no prospective, randomized controlled trials have compared sleeve lobectomy to pneumonectomy, but she added, “it is unlikely that such a trial could be successfully executed.” The 5:1 ratio of patients having pneumonectomy vs. sleeve lobectomy in this study is similar to findings from the Society of Thoracic Surgeons General Thoracic Surgery database (J Thorac Cardiovasc Surg. 2008;132:247-54), Dr. Tong pointed out, “and likely reflects the fact that sleeve lobectomy can be technically more difficult to perform.”
The findings of the French Society of Thoracic and Cardiovascular Surgery group “should strongly encourage thoracic surgeons to perform pneumonectomy as sparingly as possible,” and consider sleeve lobectomy the standard for patients with central tumors, Dr. Tong said.
She had no financial relationships to disclose.
The study by Dr. Pagès and his colleagues is unique in the field of surgery for non–small cell lung cancer in that it drew on a nationwide database using data from 103 centers, Betty C. Tong, MD, MHS, of Duke University Medical Center, Durham, said in her invited commentary (J Thorac Cardiovasc Surg. 2017;153:196). “These results are likely as close to real life as possible,” she said.
She acknowledged that no prospective, randomized controlled trials have compared sleeve lobectomy to pneumonectomy, but she added, “it is unlikely that such a trial could be successfully executed.” The 5:1 ratio of patients having pneumonectomy vs. sleeve lobectomy in this study is similar to findings from the Society of Thoracic Surgeons General Thoracic Surgery database (J Thorac Cardiovasc Surg. 2008;132:247-54), Dr. Tong pointed out, “and likely reflects the fact that sleeve lobectomy can be technically more difficult to perform.”
The findings of the French Society of Thoracic and Cardiovascular Surgery group “should strongly encourage thoracic surgeons to perform pneumonectomy as sparingly as possible,” and consider sleeve lobectomy the standard for patients with central tumors, Dr. Tong said.
She had no financial relationships to disclose.
The study by Dr. Pagès and his colleagues is unique in the field of surgery for non–small cell lung cancer in that it drew on a nationwide database using data from 103 centers, Betty C. Tong, MD, MHS, of Duke University Medical Center, Durham, said in her invited commentary (J Thorac Cardiovasc Surg. 2017;153:196). “These results are likely as close to real life as possible,” she said.
She acknowledged that no prospective, randomized controlled trials have compared sleeve lobectomy to pneumonectomy, but she added, “it is unlikely that such a trial could be successfully executed.” The 5:1 ratio of patients having pneumonectomy vs. sleeve lobectomy in this study is similar to findings from the Society of Thoracic Surgeons General Thoracic Surgery database (J Thorac Cardiovasc Surg. 2008;132:247-54), Dr. Tong pointed out, “and likely reflects the fact that sleeve lobectomy can be technically more difficult to perform.”
The findings of the French Society of Thoracic and Cardiovascular Surgery group “should strongly encourage thoracic surgeons to perform pneumonectomy as sparingly as possible,” and consider sleeve lobectomy the standard for patients with central tumors, Dr. Tong said.
She had no financial relationships to disclose.
Guidelines that recommend sleeve lobectomy as a means of avoiding pneumonectomy for lung cancer have been based on a limited retrospective series, but a large series drawn from a nationwide database in France has confirmed the preference for sleeve lobectomy because it leads to higher rates of survival, despite an increased risk of postoperative pulmonary complications.
“Whenever it is technically possible, surgeons must perform sleeve lobectomy to provide more long-term survival benefits to patients, even with the risk of more postoperative pulmonary complications,” said Pierre-Benoit Pagès, MD, PhD, and his coauthors in the January 2017 issue of the Journal of Thoracic and Cardiovascular Surgery (2017;153:184-95). Dr. Pagès is with the department of thoracic and cardiovascular surgery at the University Hospital Center Dijon (France) and Bocage Hospital.
Three-year overall survival was 71.9% for the sleeve lobectomy group vs. 60.8% for the pneumonectomy group. Three-year disease-free survival was 46.4% for the sleeve lobectomy group and 31.6% for the pneumonectomy group. In addition, compared with the sleeve lobectomy group, the pneumonectomy group had an increased risk of recurrence by matching (hazard ratio, 1.49; 95% CI, 1.1-2).
The researchers performed a propensity-matched analysis that favored sleeve lobectomy for early overall and disease-free survival, but the weighted analysis did not. Patients in the sleeve lobectomy group vs. the pneumonectomy group were younger (60.9 years vs. 61.9), had higher body mass index (25.6 vs. 25.1), had higher average forced expiratory volume (74.1% vs. 62.9%), and had lower American Society of Anesthesiologists scores (73.7% with scores of 1 and 2 vs. 70.8%). Sleeve lobectomy patients also were more likely to have right-sided surgery (69.6% vs. 41%) and squamous cell carcinoma (54.6% vs. 48.3%), and lower T and N stages (T1 and T2, 60.5% vs. 40.6%; N0, 40.9% vs. 26.2%).
Overall mortality after surgery was 5% in the sleeve lobectomy group vs. 5.9% in the pneumonectomy group, but propensity scoring showed far fewer postoperative pulmonary complications in the pneumonectomy group, with an odds ratio of 0.4, Dr. Pagès and his coauthors said. However, with other significant complications – arrhythmia, bronchopleural fistula, empyema, and hemorrhage – pneumonectomy had a propensity-matched odds ratio ranging from 1.6 to 7. “We found no significant difference regarding postoperative mortality in the sleeve lobectomy and pneumonectomy groups, whatever the statistical method used,” Dr. Pagès and his coauthors wrote.
The investigators had no financial relationships to disclose.
Guidelines that recommend sleeve lobectomy as a means of avoiding pneumonectomy for lung cancer have been based on a limited retrospective series, but a large series drawn from a nationwide database in France has confirmed the preference for sleeve lobectomy because it leads to higher rates of survival, despite an increased risk of postoperative pulmonary complications.
“Whenever it is technically possible, surgeons must perform sleeve lobectomy to provide more long-term survival benefits to patients, even with the risk of more postoperative pulmonary complications,” said Pierre-Benoit Pagès, MD, PhD, and his coauthors in the January 2017 issue of the Journal of Thoracic and Cardiovascular Surgery (2017;153:184-95). Dr. Pagès is with the department of thoracic and cardiovascular surgery at the University Hospital Center Dijon (France) and Bocage Hospital.
Three-year overall survival was 71.9% for the sleeve lobectomy group vs. 60.8% for the pneumonectomy group. Three-year disease-free survival was 46.4% for the sleeve lobectomy group and 31.6% for the pneumonectomy group. In addition, compared with the sleeve lobectomy group, the pneumonectomy group had an increased risk of recurrence by matching (hazard ratio, 1.49; 95% CI, 1.1-2).
The researchers performed a propensity-matched analysis that favored sleeve lobectomy for early overall and disease-free survival, but the weighted analysis did not. Patients in the sleeve lobectomy group vs. the pneumonectomy group were younger (60.9 years vs. 61.9), had higher body mass index (25.6 vs. 25.1), had higher average forced expiratory volume (74.1% vs. 62.9%), and had lower American Society of Anesthesiologists scores (73.7% with scores of 1 and 2 vs. 70.8%). Sleeve lobectomy patients also were more likely to have right-sided surgery (69.6% vs. 41%) and squamous cell carcinoma (54.6% vs. 48.3%), and lower T and N stages (T1 and T2, 60.5% vs. 40.6%; N0, 40.9% vs. 26.2%).
Overall mortality after surgery was 5% in the sleeve lobectomy group vs. 5.9% in the pneumonectomy group, but propensity scoring showed far fewer postoperative pulmonary complications in the pneumonectomy group, with an odds ratio of 0.4, Dr. Pagès and his coauthors said. However, with other significant complications – arrhythmia, bronchopleural fistula, empyema, and hemorrhage – pneumonectomy had a propensity-matched odds ratio ranging from 1.6 to 7. “We found no significant difference regarding postoperative mortality in the sleeve lobectomy and pneumonectomy groups, whatever the statistical method used,” Dr. Pagès and his coauthors wrote.
The investigators had no financial relationships to disclose.
Key clinical point: Sleeve lobectomy for non–small cell lung cancer may lead to higher rates of overall and disease-free survival vs. pneumonectomy.
Major finding: Overall postoperative mortality was 5% in the sleeve lobectomy group vs. 5.9% in the pneumonectomy group.
Data source: An analysis of 941 sleeve lobectomy and 5,318 pneumonectomy procedures from 2005 to 2014 in the nationwide French database Epithor.
Disclosures: Dr. Pagès has received research grants from the Nuovo-Soldati Foundation for Cancer Research and the French Society of Thoracic and Cardiovascular Surgery, on whose behalf the study was performed. Dr. Pagès and his coauthors had no financial relationships to disclose.
Esophageal cancers: Apples and oranges wrongly lumped together
Genomic analysis suggests that esophageal adenocarcinoma (EAC) and esophageal squamous cell carcinoma (ESCC) are two separate diseases that should not be combined in clinical trials and may benefit from different treatments, according to the results of a molecular study of 559 esophageal and gastric carcinoma tumors obtained from around the world.
The comprehensive molecular analysis comprised 164 esophageal tumors, 359 gastric adenocarcinomas, and 36 additional adenocarcinomas spanning the gastroesophageal junction.
The results of their analysis “call into question the premise of envisioning esophageal carcinoma as a single entity” and “argue against approaches that combine EAC and ESCC for clinical trials of neoadjuvant, adjuvant, or systemic therapies,” wrote the members of The Cancer Genome Atlas Research Network under the coordination of the National Cancer Institute and the National Human Genome Research Institute project.
The researchers evaluated the 164 esophageal carcinomas using integrated clustering of somatic copy number aberrations, DNA methylation, mRNA, and microRNA expression.
Gene expression analysis showed EACs had increased E-cadherin (CDH1) signaling and upregulation of ARF6 and FOXA pathways, which regulate E-cadherin. In contrast, ESCCs showed upregulation of Wnt, syndecan; p63 pathways, which are essential for squamous epithelial cell differentiation, were also upregulated. “These data suggest the presence of lineage-specific alterations that drive progression in EACs and ESCCs,” according to the researchers.
Somatic genome alterations showed that many of the same genetic pathways were altered in both EAC and ESCC, but the specific genes affected were dissimilar, suggesting distinct pathophysiologies between the two types of cancer. This could signal the need for different treatment approaches and led the researchers to caution against lumping EAC and ESCC in the same clinical trials.
Molecular subtype analysis of the ESCC cancers showed three molecular subtypes: ESCC1 (50 tumors), ESCC2 (36) and ESCC3 (4), distinguished by their mutation types. ESCC1, for example, was characterized by alterations in the NRF2 pathway, mutations in which are associated with poor prognosis and resistance to chemotherapy.
The three subtypes also showed trends for geographic associations, with Vietnamese patients (the only Asian population studied) showing a predominance of ESCC1 (27/41), and all 4 ESCC3 tumors being derived from United States patients.
The researchers also evaluated the molecular association between ESCC and human papillomavirus (HPV), which has been shown to have a pathogenic role in cervical SCC and head and neck (HN)SCC. They found that ESCC mRNA sequencing showed that ESCC-HPV transcript levels were similar to HPV-negative HNSCC tumors, diminishing the likelihood of an etiological role for HPV in ESCC.
In evaluating EACs in comparison to chromosomal instability (CIN) gastric cancers, the researchers found “clear similarity between chromosomal aberrations” in the two cancer types, with a stronger similarity between EAC and CIN gastric cancers than between EAC and ESCC, further differentiating the two esophageal cancers.
“The notable molecular similarity between EACs and CIN gastric cancers provides indirect support for gastric origin of Barrett’s esophagus and EAC and indicates that we may view GEA [gastroesophageal adenocarcinoma] as a singular entity, analogous to colorectal adenocarcinoma,” the authors added.
A notable anatomic gradient showed up in the progression of DNA methylation as seen from proximal to distal GEA-CIN tumors, with the most frequent hypermethylation seen in EACs, compared with gastric CIN cancers, a significant difference.
“These molecular data show that EAC and ESCC are distinct in their molecular characteristics across all platforms tested. ESCC emerges as a disease more reminiscent of other SCCs than of EAC, which itself bears striking resemblance to CIN gastric cancer,” the researchers concluded.
The authors reported that they had no competing financial interests.
This article published in Nature summarizes an integrated genomic analysis of esophageal cancer with careful comparisons to other cancers in the neighborhood (head and neck, lung, and gastric cancer). While clinically apparent to physicians taking care of esophageal cancer throughout the world, these analyses confirm that esophageal squamous cell cancer and esophageal adenocarcinoma are essentially two different diseases with distinct genomic characteristics. This has an important implication in clinical trial design: These pathologies should not be analyzed together, but instead should be studied distinctly.
In addition to the above major conclusion, several other features deserve to be noted. First, esophageal cancer does not seem to be associated with HPV as the HPV transcript levels in these tumors resemble those in HPV-negative head and neck cancers. Second, there are significant differences in the genomic characteristics of esophageal squamous cell cancer depending on geographic location. Third, esophageal adenocarcinoma is most like one particular molecular variant of gastric cancer (chromosomal instability type) and as one moves from the gastric antrum to the esophagus, there is an enrichment of this type of cancer. Such a gradient is found in methylation patterns as well, suggesting a similar cell of origin between gastric and esophageal cancers.
This study brings into focus the overarching theme that cancers may soon be treated based on molecular characteristics rather than anatomic location and clinical trials may have to be grouped based on genetic changes rather than organ systems.
Sai Yendamuri, MD, FACS, is an attending surgeon at the department of thoracic surgery, and director, Thoracic Surgery Research Laboratory, and an associate professor of oncology at Roswell Park Cancer Institute, Buffalo, N.Y.
This article published in Nature summarizes an integrated genomic analysis of esophageal cancer with careful comparisons to other cancers in the neighborhood (head and neck, lung, and gastric cancer). While clinically apparent to physicians taking care of esophageal cancer throughout the world, these analyses confirm that esophageal squamous cell cancer and esophageal adenocarcinoma are essentially two different diseases with distinct genomic characteristics. This has an important implication in clinical trial design: These pathologies should not be analyzed together, but instead should be studied distinctly.
In addition to the above major conclusion, several other features deserve to be noted. First, esophageal cancer does not seem to be associated with HPV as the HPV transcript levels in these tumors resemble those in HPV-negative head and neck cancers. Second, there are significant differences in the genomic characteristics of esophageal squamous cell cancer depending on geographic location. Third, esophageal adenocarcinoma is most like one particular molecular variant of gastric cancer (chromosomal instability type) and as one moves from the gastric antrum to the esophagus, there is an enrichment of this type of cancer. Such a gradient is found in methylation patterns as well, suggesting a similar cell of origin between gastric and esophageal cancers.
This study brings into focus the overarching theme that cancers may soon be treated based on molecular characteristics rather than anatomic location and clinical trials may have to be grouped based on genetic changes rather than organ systems.
Sai Yendamuri, MD, FACS, is an attending surgeon at the department of thoracic surgery, and director, Thoracic Surgery Research Laboratory, and an associate professor of oncology at Roswell Park Cancer Institute, Buffalo, N.Y.
This article published in Nature summarizes an integrated genomic analysis of esophageal cancer with careful comparisons to other cancers in the neighborhood (head and neck, lung, and gastric cancer). While clinically apparent to physicians taking care of esophageal cancer throughout the world, these analyses confirm that esophageal squamous cell cancer and esophageal adenocarcinoma are essentially two different diseases with distinct genomic characteristics. This has an important implication in clinical trial design: These pathologies should not be analyzed together, but instead should be studied distinctly.
In addition to the above major conclusion, several other features deserve to be noted. First, esophageal cancer does not seem to be associated with HPV as the HPV transcript levels in these tumors resemble those in HPV-negative head and neck cancers. Second, there are significant differences in the genomic characteristics of esophageal squamous cell cancer depending on geographic location. Third, esophageal adenocarcinoma is most like one particular molecular variant of gastric cancer (chromosomal instability type) and as one moves from the gastric antrum to the esophagus, there is an enrichment of this type of cancer. Such a gradient is found in methylation patterns as well, suggesting a similar cell of origin between gastric and esophageal cancers.
This study brings into focus the overarching theme that cancers may soon be treated based on molecular characteristics rather than anatomic location and clinical trials may have to be grouped based on genetic changes rather than organ systems.
Sai Yendamuri, MD, FACS, is an attending surgeon at the department of thoracic surgery, and director, Thoracic Surgery Research Laboratory, and an associate professor of oncology at Roswell Park Cancer Institute, Buffalo, N.Y.
Genomic analysis suggests that esophageal adenocarcinoma (EAC) and esophageal squamous cell carcinoma (ESCC) are two separate diseases that should not be combined in clinical trials and may benefit from different treatments, according to the results of a molecular study of 559 esophageal and gastric carcinoma tumors obtained from around the world.
The comprehensive molecular analysis comprised 164 esophageal tumors, 359 gastric adenocarcinomas, and 36 additional adenocarcinomas spanning the gastroesophageal junction.
The results of their analysis “call into question the premise of envisioning esophageal carcinoma as a single entity” and “argue against approaches that combine EAC and ESCC for clinical trials of neoadjuvant, adjuvant, or systemic therapies,” wrote the members of The Cancer Genome Atlas Research Network under the coordination of the National Cancer Institute and the National Human Genome Research Institute project.
The researchers evaluated the 164 esophageal carcinomas using integrated clustering of somatic copy number aberrations, DNA methylation, mRNA, and microRNA expression.
Gene expression analysis showed EACs had increased E-cadherin (CDH1) signaling and upregulation of ARF6 and FOXA pathways, which regulate E-cadherin. In contrast, ESCCs showed upregulation of Wnt, syndecan; p63 pathways, which are essential for squamous epithelial cell differentiation, were also upregulated. “These data suggest the presence of lineage-specific alterations that drive progression in EACs and ESCCs,” according to the researchers.
Somatic genome alterations showed that many of the same genetic pathways were altered in both EAC and ESCC, but the specific genes affected were dissimilar, suggesting distinct pathophysiologies between the two types of cancer. This could signal the need for different treatment approaches and led the researchers to caution against lumping EAC and ESCC in the same clinical trials.
Molecular subtype analysis of the ESCC cancers showed three molecular subtypes: ESCC1 (50 tumors), ESCC2 (36) and ESCC3 (4), distinguished by their mutation types. ESCC1, for example, was characterized by alterations in the NRF2 pathway, mutations in which are associated with poor prognosis and resistance to chemotherapy.
The three subtypes also showed trends for geographic associations, with Vietnamese patients (the only Asian population studied) showing a predominance of ESCC1 (27/41), and all 4 ESCC3 tumors being derived from United States patients.
The researchers also evaluated the molecular association between ESCC and human papillomavirus (HPV), which has been shown to have a pathogenic role in cervical SCC and head and neck (HN)SCC. They found that ESCC mRNA sequencing showed that ESCC-HPV transcript levels were similar to HPV-negative HNSCC tumors, diminishing the likelihood of an etiological role for HPV in ESCC.
In evaluating EACs in comparison to chromosomal instability (CIN) gastric cancers, the researchers found “clear similarity between chromosomal aberrations” in the two cancer types, with a stronger similarity between EAC and CIN gastric cancers than between EAC and ESCC, further differentiating the two esophageal cancers.
“The notable molecular similarity between EACs and CIN gastric cancers provides indirect support for gastric origin of Barrett’s esophagus and EAC and indicates that we may view GEA [gastroesophageal adenocarcinoma] as a singular entity, analogous to colorectal adenocarcinoma,” the authors added.
A notable anatomic gradient showed up in the progression of DNA methylation as seen from proximal to distal GEA-CIN tumors, with the most frequent hypermethylation seen in EACs, compared with gastric CIN cancers, a significant difference.
“These molecular data show that EAC and ESCC are distinct in their molecular characteristics across all platforms tested. ESCC emerges as a disease more reminiscent of other SCCs than of EAC, which itself bears striking resemblance to CIN gastric cancer,” the researchers concluded.
The authors reported that they had no competing financial interests.
Genomic analysis suggests that esophageal adenocarcinoma (EAC) and esophageal squamous cell carcinoma (ESCC) are two separate diseases that should not be combined in clinical trials and may benefit from different treatments, according to the results of a molecular study of 559 esophageal and gastric carcinoma tumors obtained from around the world.
The comprehensive molecular analysis comprised 164 esophageal tumors, 359 gastric adenocarcinomas, and 36 additional adenocarcinomas spanning the gastroesophageal junction.
The results of their analysis “call into question the premise of envisioning esophageal carcinoma as a single entity” and “argue against approaches that combine EAC and ESCC for clinical trials of neoadjuvant, adjuvant, or systemic therapies,” wrote the members of The Cancer Genome Atlas Research Network under the coordination of the National Cancer Institute and the National Human Genome Research Institute project.
The researchers evaluated the 164 esophageal carcinomas using integrated clustering of somatic copy number aberrations, DNA methylation, mRNA, and microRNA expression.
Gene expression analysis showed EACs had increased E-cadherin (CDH1) signaling and upregulation of ARF6 and FOXA pathways, which regulate E-cadherin. In contrast, ESCCs showed upregulation of Wnt, syndecan; p63 pathways, which are essential for squamous epithelial cell differentiation, were also upregulated. “These data suggest the presence of lineage-specific alterations that drive progression in EACs and ESCCs,” according to the researchers.
Somatic genome alterations showed that many of the same genetic pathways were altered in both EAC and ESCC, but the specific genes affected were dissimilar, suggesting distinct pathophysiologies between the two types of cancer. This could signal the need for different treatment approaches and led the researchers to caution against lumping EAC and ESCC in the same clinical trials.
Molecular subtype analysis of the ESCC cancers showed three molecular subtypes: ESCC1 (50 tumors), ESCC2 (36) and ESCC3 (4), distinguished by their mutation types. ESCC1, for example, was characterized by alterations in the NRF2 pathway, mutations in which are associated with poor prognosis and resistance to chemotherapy.
The three subtypes also showed trends for geographic associations, with Vietnamese patients (the only Asian population studied) showing a predominance of ESCC1 (27/41), and all 4 ESCC3 tumors being derived from United States patients.
The researchers also evaluated the molecular association between ESCC and human papillomavirus (HPV), which has been shown to have a pathogenic role in cervical SCC and head and neck (HN)SCC. They found that ESCC mRNA sequencing showed that ESCC-HPV transcript levels were similar to HPV-negative HNSCC tumors, diminishing the likelihood of an etiological role for HPV in ESCC.
In evaluating EACs in comparison to chromosomal instability (CIN) gastric cancers, the researchers found “clear similarity between chromosomal aberrations” in the two cancer types, with a stronger similarity between EAC and CIN gastric cancers than between EAC and ESCC, further differentiating the two esophageal cancers.
“The notable molecular similarity between EACs and CIN gastric cancers provides indirect support for gastric origin of Barrett’s esophagus and EAC and indicates that we may view GEA [gastroesophageal adenocarcinoma] as a singular entity, analogous to colorectal adenocarcinoma,” the authors added.
A notable anatomic gradient showed up in the progression of DNA methylation as seen from proximal to distal GEA-CIN tumors, with the most frequent hypermethylation seen in EACs, compared with gastric CIN cancers, a significant difference.
“These molecular data show that EAC and ESCC are distinct in their molecular characteristics across all platforms tested. ESCC emerges as a disease more reminiscent of other SCCs than of EAC, which itself bears striking resemblance to CIN gastric cancer,” the researchers concluded.
The authors reported that they had no competing financial interests.
FROM NATURE
Key clinical point:
Major finding: Molecular analysis showed esophageal squamous cell carcinoma is more like other squamous cell carcinomas than esophageal adenocarcinoma, which itself resembles chromosomal-instability gastric cancer.
Data source: A molecular study of 559 esophageal and gastric carcinoma tumors obtained from around the world.
Disclosures: The authors reported that they had no competing financial interests.
Ultrashort course antibiotics may be enough in stable VAP
Ultrashort courses of antibiotics led to similar outcomes as longer durations of therapy among adults with suspected ventilator-associated pneumonia but minimal and stable ventilator settings, according to a large retrospective observational study.
The duration of antibiotic therapy did not significantly affect the time to extubation alive (hazard ratio, 1.2; 95% CI, 1.0-1.4), time to hospital discharge (HR, 1.1; 95% CI, 0.9-1.3), rates of ventilator death (HR, 0.8; 95% CI, 0.6-1.2), or rates of hospital death (HR, 1.0; 95% CI, 0.8-1.31).), said Michael Klompas, MD, and his associates at Harvard Medical School in Boston. If confirmed, the findings would support surveillance of serial ventilator settings to “identify candidates for early antibiotic discontinuation,” the investigators reported (Clin Infect Dis. 2016 Dec 29. doi: 10.1093/cid/ciw870).
Suspected respiratory infections account for up to 70% of ICU antibiotic prescriptions, a “substantial fraction” of which may be unnecessary, the researchers said. “The predilection to overprescribe antibiotics for patients with possible ventilator-associated pneumonia (VAP) is not due to poor clinical skills per se, but rather the tension between practice guidelines that encourage early and aggressive prescribing [and] the difficulty [of] accurately diagnosing VAP,” they wrote. While withholding antibiotics in suspected VAP is “unrealistic” and can contribute to mortality, observing clinical trajectories and stopping antibiotics early when appropriate “may be more promising,” they added.
To test that idea, the researchers studied 1,290 cases of suspected VAP treated at Brigham and Women’s Hospital between 2006 and 2014. On the day antibiotics were started and during each of the next 2 days, all patients had a daily minimum positive end-expiratory pressure (PEEP) of no more than 5 cm H2O and a daily minimum fraction of inspired oxygen (FiO2) of no more than 40%.
A total of 259 patients received 1-3 days of antibiotics, while 1,031 patients received more than 3 days of therapy. These two groups were similar demographically, clinically, and in terms of comorbidities. Point estimates tended to favor ultrashort course antibiotics, but no association reached statistical significance in the overall analysis or in subgroups based on confirmed VAP diagnosis, confirmed pathogenic infection, or propensity-matched pairs.
The results suggest “that patients with suspected VAP but minimal and stable ventilator settings can be adequately managed with very short courses of antibiotics,” Dr. Klompas and his associates concluded. “If these findings are confirmed, assessing ventilator settings may prove to be a simple and objective strategy to identify potential candidates for early antibiotic discontinuation.”
The work was supported by the Centers for Disease Control and Prevention’s Prevention Epicenters Program. The investigators had no relevant financial disclosures.
Ultrashort courses of antibiotics led to similar outcomes as longer durations of therapy among adults with suspected ventilator-associated pneumonia but minimal and stable ventilator settings, according to a large retrospective observational study.
The duration of antibiotic therapy did not significantly affect the time to extubation alive (hazard ratio, 1.2; 95% CI, 1.0-1.4), time to hospital discharge (HR, 1.1; 95% CI, 0.9-1.3), rates of ventilator death (HR, 0.8; 95% CI, 0.6-1.2), or rates of hospital death (HR, 1.0; 95% CI, 0.8-1.31).), said Michael Klompas, MD, and his associates at Harvard Medical School in Boston. If confirmed, the findings would support surveillance of serial ventilator settings to “identify candidates for early antibiotic discontinuation,” the investigators reported (Clin Infect Dis. 2016 Dec 29. doi: 10.1093/cid/ciw870).
Suspected respiratory infections account for up to 70% of ICU antibiotic prescriptions, a “substantial fraction” of which may be unnecessary, the researchers said. “The predilection to overprescribe antibiotics for patients with possible ventilator-associated pneumonia (VAP) is not due to poor clinical skills per se, but rather the tension between practice guidelines that encourage early and aggressive prescribing [and] the difficulty [of] accurately diagnosing VAP,” they wrote. While withholding antibiotics in suspected VAP is “unrealistic” and can contribute to mortality, observing clinical trajectories and stopping antibiotics early when appropriate “may be more promising,” they added.
To test that idea, the researchers studied 1,290 cases of suspected VAP treated at Brigham and Women’s Hospital between 2006 and 2014. On the day antibiotics were started and during each of the next 2 days, all patients had a daily minimum positive end-expiratory pressure (PEEP) of no more than 5 cm H2O and a daily minimum fraction of inspired oxygen (FiO2) of no more than 40%.
A total of 259 patients received 1-3 days of antibiotics, while 1,031 patients received more than 3 days of therapy. These two groups were similar demographically, clinically, and in terms of comorbidities. Point estimates tended to favor ultrashort course antibiotics, but no association reached statistical significance in the overall analysis or in subgroups based on confirmed VAP diagnosis, confirmed pathogenic infection, or propensity-matched pairs.
The results suggest “that patients with suspected VAP but minimal and stable ventilator settings can be adequately managed with very short courses of antibiotics,” Dr. Klompas and his associates concluded. “If these findings are confirmed, assessing ventilator settings may prove to be a simple and objective strategy to identify potential candidates for early antibiotic discontinuation.”
The work was supported by the Centers for Disease Control and Prevention’s Prevention Epicenters Program. The investigators had no relevant financial disclosures.
Ultrashort courses of antibiotics led to similar outcomes as longer durations of therapy among adults with suspected ventilator-associated pneumonia but minimal and stable ventilator settings, according to a large retrospective observational study.
The duration of antibiotic therapy did not significantly affect the time to extubation alive (hazard ratio, 1.2; 95% CI, 1.0-1.4), time to hospital discharge (HR, 1.1; 95% CI, 0.9-1.3), rates of ventilator death (HR, 0.8; 95% CI, 0.6-1.2), or rates of hospital death (HR, 1.0; 95% CI, 0.8-1.31).), said Michael Klompas, MD, and his associates at Harvard Medical School in Boston. If confirmed, the findings would support surveillance of serial ventilator settings to “identify candidates for early antibiotic discontinuation,” the investigators reported (Clin Infect Dis. 2016 Dec 29. doi: 10.1093/cid/ciw870).
Suspected respiratory infections account for up to 70% of ICU antibiotic prescriptions, a “substantial fraction” of which may be unnecessary, the researchers said. “The predilection to overprescribe antibiotics for patients with possible ventilator-associated pneumonia (VAP) is not due to poor clinical skills per se, but rather the tension between practice guidelines that encourage early and aggressive prescribing [and] the difficulty [of] accurately diagnosing VAP,” they wrote. While withholding antibiotics in suspected VAP is “unrealistic” and can contribute to mortality, observing clinical trajectories and stopping antibiotics early when appropriate “may be more promising,” they added.
To test that idea, the researchers studied 1,290 cases of suspected VAP treated at Brigham and Women’s Hospital between 2006 and 2014. On the day antibiotics were started and during each of the next 2 days, all patients had a daily minimum positive end-expiratory pressure (PEEP) of no more than 5 cm H2O and a daily minimum fraction of inspired oxygen (FiO2) of no more than 40%.
A total of 259 patients received 1-3 days of antibiotics, while 1,031 patients received more than 3 days of therapy. These two groups were similar demographically, clinically, and in terms of comorbidities. Point estimates tended to favor ultrashort course antibiotics, but no association reached statistical significance in the overall analysis or in subgroups based on confirmed VAP diagnosis, confirmed pathogenic infection, or propensity-matched pairs.
The results suggest “that patients with suspected VAP but minimal and stable ventilator settings can be adequately managed with very short courses of antibiotics,” Dr. Klompas and his associates concluded. “If these findings are confirmed, assessing ventilator settings may prove to be a simple and objective strategy to identify potential candidates for early antibiotic discontinuation.”
The work was supported by the Centers for Disease Control and Prevention’s Prevention Epicenters Program. The investigators had no relevant financial disclosures.
Key clinical point: Ultrashort antibiotic courses yielded outcomes that were similar to those with longer courses in patients with suspected ventilator-associated pneumonia but minimal and stable ventilator settings.
Major finding: The groups did not significantly differ based on time to extubation alive (hazard ratio, 1.2), time to hospital discharge (HR, 1.1; 95% CI, 0.9-1.3), rates of ventilator death (HR, 0.8; 95% CI, 0.6-1.2), or rates of hospital death (HR, 1.0; 95% CI, 0.8-1.31).
Data source: A single-center retrospective observational study of 1,290 patients with suspected ventilator-associated pneumonia.
Disclosures: The work was supported by the Centers for Disease Control and Prevention’s Prevention Epicenters Program. The investigators had no relevant financial disclosures.
PD-L1 testing in NSCLC patients shows high concordance
VIENNA – Several different tests for PD-L1 levels in tumor cells of patients with metastatic non–small cell lung cancer showed high concordance when run at seven French centers, boosting confidence in the clinical utility of this testing to guide first-line pembrolizumab treatment of patients with this cancer.
Among 27 laboratory-developed tests for PD-L1 (programmed death–ligand 1) levels in tumor cells that used any one of three prespecified testing platforms (made by Dako, Ventana, or Leica), 14 (52%) had “similar” concordance when compared with reference assays, Julien Adam, MD, said at the World Conference on Lung Cancer, sponsored by the International Association for the Study of Lung Cancer. “These results will provide the basis for making national recommendations for PD-L1 testing in patients with non–small cell lung cancer [NSCLC]” in France, added Dr. Adam, a pathologist at Gustave Roussy Cancer Center in Paris. “We expect to produce recommendations by the second half of 2017.”
Although the results came entirely from French centers, the results will also likely influence U.S. practice, predicted Shirish M. Gadgeel, MD, a thoracic oncologist at the Karmanos Cancer Institute in Detroit. The approval pembrolizumab (Keytruda) received from the Food and Drug Administration in October specified that patients with metastatic NSCLC had to show PD-L1 expression in the tumor using a FDA-approved test to receive pembrolizumab as first-line treatment.
“Before pembrolizumab’s approval there was no incentive to do PD-L1 testing,” but now it is becoming routine, he said. “It has been challenging to U.S. laboratories to decide which platform and antibody to use. Harmonization gives us confidence that if you have a platform and appropriate antibody you should be able to use the results clinically. I think the French results can be extrapolated” to U.S. practice because the results “came from multiple labs using multiple antibodies and platforms,” Dr. Gadgeel said.
The French study arranged for PD-L1 testing of NSCLC specimens from 41 patients selected as broadly representative of PD-L1 expression levels. The seven participating centers used a Dako (three centers), Ventana (two centers), or Leica (two centers) testing platform and one of five available antibodies that bind PD-L1. Every center ran tests that depended on different antibodies, and tests occurred on both tumor cells and immune cells. In total the seven testing sites collectively performed 35 stainings on each specimen for a total of 1,435 slides. In tumor cells, the overall, weighted kappa coefficient for concordance was 0.81 for tests that used the SP263 antibody and 0.78 for those using the E1L3N antibody, both high enough to make them potential candidates for routine use, said Dr. Adam. The 28-8 and 22C3 antibodies also showed high concordance levels. In contrast, some antibodies used at certain centers produced unacceptable results with concordance coefficients of less than 0.5. The best performing antibody overall was SP263.
No test measuring PD-L1 level in immune cells had an acceptable concordance rate, Dr. Adam also reported.
mzoler@frontlinemedcom.com
On Twitter @mitchelzoler
Researchers have developed several different antibodies for measuring levels of PD-L1 in tumor cells and the antibodies can be used in several different testing platforms. Although most laboratories focus on using one specific immunohistochemical platform, the overall status of real-world PD-L1 testing is messy.
In the results reported by Dr. Adam, concordance weighted kappa coefficients of 0.8 or higher show extremely good concordance, and coefficients of 0.6-0.79 show good concordance. Several of the tests and testing sites reported by Dr. Adam showed concordance coefficients within these ranges. In certain other cases the concordance coefficients were very low, which prompts concern about the reliability of these low-scoring tests. The results show that the results you see in one laboratory with a specific antibody and platform test may not always remain consistent with the same antibody and platform used elsewhere.
Michael Boyer, MD, is a professor of medicine at the University of Sydney and a thoracic oncologist and chief clinical officer of the Chris O’Brien Lifehouse in Sydney. He has received research support from Merck and from AstraZeneca, Bristol-Myers Squibb, Clovis, Eli Lilly, Pfizer, and Roche. He made these comments as designated discussant for the report.
Researchers have developed several different antibodies for measuring levels of PD-L1 in tumor cells and the antibodies can be used in several different testing platforms. Although most laboratories focus on using one specific immunohistochemical platform, the overall status of real-world PD-L1 testing is messy.
In the results reported by Dr. Adam, concordance weighted kappa coefficients of 0.8 or higher show extremely good concordance, and coefficients of 0.6-0.79 show good concordance. Several of the tests and testing sites reported by Dr. Adam showed concordance coefficients within these ranges. In certain other cases the concordance coefficients were very low, which prompts concern about the reliability of these low-scoring tests. The results show that the results you see in one laboratory with a specific antibody and platform test may not always remain consistent with the same antibody and platform used elsewhere.
Michael Boyer, MD, is a professor of medicine at the University of Sydney and a thoracic oncologist and chief clinical officer of the Chris O’Brien Lifehouse in Sydney. He has received research support from Merck and from AstraZeneca, Bristol-Myers Squibb, Clovis, Eli Lilly, Pfizer, and Roche. He made these comments as designated discussant for the report.
Researchers have developed several different antibodies for measuring levels of PD-L1 in tumor cells and the antibodies can be used in several different testing platforms. Although most laboratories focus on using one specific immunohistochemical platform, the overall status of real-world PD-L1 testing is messy.
In the results reported by Dr. Adam, concordance weighted kappa coefficients of 0.8 or higher show extremely good concordance, and coefficients of 0.6-0.79 show good concordance. Several of the tests and testing sites reported by Dr. Adam showed concordance coefficients within these ranges. In certain other cases the concordance coefficients were very low, which prompts concern about the reliability of these low-scoring tests. The results show that the results you see in one laboratory with a specific antibody and platform test may not always remain consistent with the same antibody and platform used elsewhere.
Michael Boyer, MD, is a professor of medicine at the University of Sydney and a thoracic oncologist and chief clinical officer of the Chris O’Brien Lifehouse in Sydney. He has received research support from Merck and from AstraZeneca, Bristol-Myers Squibb, Clovis, Eli Lilly, Pfizer, and Roche. He made these comments as designated discussant for the report.
VIENNA – Several different tests for PD-L1 levels in tumor cells of patients with metastatic non–small cell lung cancer showed high concordance when run at seven French centers, boosting confidence in the clinical utility of this testing to guide first-line pembrolizumab treatment of patients with this cancer.
Among 27 laboratory-developed tests for PD-L1 (programmed death–ligand 1) levels in tumor cells that used any one of three prespecified testing platforms (made by Dako, Ventana, or Leica), 14 (52%) had “similar” concordance when compared with reference assays, Julien Adam, MD, said at the World Conference on Lung Cancer, sponsored by the International Association for the Study of Lung Cancer. “These results will provide the basis for making national recommendations for PD-L1 testing in patients with non–small cell lung cancer [NSCLC]” in France, added Dr. Adam, a pathologist at Gustave Roussy Cancer Center in Paris. “We expect to produce recommendations by the second half of 2017.”
Although the results came entirely from French centers, the results will also likely influence U.S. practice, predicted Shirish M. Gadgeel, MD, a thoracic oncologist at the Karmanos Cancer Institute in Detroit. The approval pembrolizumab (Keytruda) received from the Food and Drug Administration in October specified that patients with metastatic NSCLC had to show PD-L1 expression in the tumor using a FDA-approved test to receive pembrolizumab as first-line treatment.
“Before pembrolizumab’s approval there was no incentive to do PD-L1 testing,” but now it is becoming routine, he said. “It has been challenging to U.S. laboratories to decide which platform and antibody to use. Harmonization gives us confidence that if you have a platform and appropriate antibody you should be able to use the results clinically. I think the French results can be extrapolated” to U.S. practice because the results “came from multiple labs using multiple antibodies and platforms,” Dr. Gadgeel said.
The French study arranged for PD-L1 testing of NSCLC specimens from 41 patients selected as broadly representative of PD-L1 expression levels. The seven participating centers used a Dako (three centers), Ventana (two centers), or Leica (two centers) testing platform and one of five available antibodies that bind PD-L1. Every center ran tests that depended on different antibodies, and tests occurred on both tumor cells and immune cells. In total the seven testing sites collectively performed 35 stainings on each specimen for a total of 1,435 slides. In tumor cells, the overall, weighted kappa coefficient for concordance was 0.81 for tests that used the SP263 antibody and 0.78 for those using the E1L3N antibody, both high enough to make them potential candidates for routine use, said Dr. Adam. The 28-8 and 22C3 antibodies also showed high concordance levels. In contrast, some antibodies used at certain centers produced unacceptable results with concordance coefficients of less than 0.5. The best performing antibody overall was SP263.
No test measuring PD-L1 level in immune cells had an acceptable concordance rate, Dr. Adam also reported.
mzoler@frontlinemedcom.com
On Twitter @mitchelzoler
VIENNA – Several different tests for PD-L1 levels in tumor cells of patients with metastatic non–small cell lung cancer showed high concordance when run at seven French centers, boosting confidence in the clinical utility of this testing to guide first-line pembrolizumab treatment of patients with this cancer.
Among 27 laboratory-developed tests for PD-L1 (programmed death–ligand 1) levels in tumor cells that used any one of three prespecified testing platforms (made by Dako, Ventana, or Leica), 14 (52%) had “similar” concordance when compared with reference assays, Julien Adam, MD, said at the World Conference on Lung Cancer, sponsored by the International Association for the Study of Lung Cancer. “These results will provide the basis for making national recommendations for PD-L1 testing in patients with non–small cell lung cancer [NSCLC]” in France, added Dr. Adam, a pathologist at Gustave Roussy Cancer Center in Paris. “We expect to produce recommendations by the second half of 2017.”
Although the results came entirely from French centers, the results will also likely influence U.S. practice, predicted Shirish M. Gadgeel, MD, a thoracic oncologist at the Karmanos Cancer Institute in Detroit. The approval pembrolizumab (Keytruda) received from the Food and Drug Administration in October specified that patients with metastatic NSCLC had to show PD-L1 expression in the tumor using a FDA-approved test to receive pembrolizumab as first-line treatment.
“Before pembrolizumab’s approval there was no incentive to do PD-L1 testing,” but now it is becoming routine, he said. “It has been challenging to U.S. laboratories to decide which platform and antibody to use. Harmonization gives us confidence that if you have a platform and appropriate antibody you should be able to use the results clinically. I think the French results can be extrapolated” to U.S. practice because the results “came from multiple labs using multiple antibodies and platforms,” Dr. Gadgeel said.
The French study arranged for PD-L1 testing of NSCLC specimens from 41 patients selected as broadly representative of PD-L1 expression levels. The seven participating centers used a Dako (three centers), Ventana (two centers), or Leica (two centers) testing platform and one of five available antibodies that bind PD-L1. Every center ran tests that depended on different antibodies, and tests occurred on both tumor cells and immune cells. In total the seven testing sites collectively performed 35 stainings on each specimen for a total of 1,435 slides. In tumor cells, the overall, weighted kappa coefficient for concordance was 0.81 for tests that used the SP263 antibody and 0.78 for those using the E1L3N antibody, both high enough to make them potential candidates for routine use, said Dr. Adam. The 28-8 and 22C3 antibodies also showed high concordance levels. In contrast, some antibodies used at certain centers produced unacceptable results with concordance coefficients of less than 0.5. The best performing antibody overall was SP263.
No test measuring PD-L1 level in immune cells had an acceptable concordance rate, Dr. Adam also reported.
mzoler@frontlinemedcom.com
On Twitter @mitchelzoler
AT WCLC 2016
Key clinical point:
Major finding: The concordance weighted kappa coefficient was highest for tests using the SP263 antibody, with an average coefficient of 0.81.
Data source: Forty-one non–small cell lung cancer specimens subjected to a total of 35 different tests.
Disclosures: Funding for the study came from AstraZeneca, Bristol Myers Squibb, Merck Sharp and Dohme, and Roche. Dr. Adam has been a consultant to AstraZeneca, Bristol-Myers Squibb, HalioDx, Merck Sharp and Dohme, and Roche. Dr. Gadgeel has been a speaker on behalf of Eli Lilly, Genentech, and GlaxoSmithKline and has received research funding from AstraZeneca, Eli Lilly, and Genentech. Dr. Brahmer has served on an advisory board for Merck.
LMWH trumps unfractionated heparin in reducing posttrauma thrombotic events
HOLLYWOOD, FLA. – Low-molecular-weight heparin (LMWH) decreased the risk of venous thromboembolism in trauma patients significantly more than did unfractionated heparin, a large state database review has found.
It also was associated with a 37% decrease in overall mortality, compared with unfractionated heparin, Benjamin Jacobs, MD, said at the annual scientific assembly of the Eastern Association for the Surgery of Trauma.
He extracted data describing thromboembolism prophylaxis among 37,868 trauma patients included in the Michigan Trauma Quality Improvement Program from 2012 to 2014. The patients were treated at 23 hospitals around the state. They received either unfractionated or LMWH as their only clot-preventing protocol.
The primary outcomes of the study were reductions in the risk of venous thromboembolism (VTE), deep vein thrombosis (DVT), pulmonary thrombosis (PT), and mortality.
LMWH was given at either 40 mg every day or 30 mg twice a day. The comparator was unfractionated heparin at 5,000 U either two or three times a day.
The preferred method was LMWH, which 83% of patients received, compared with 17% who got the unfractionated heparin. Most patients who got LMWH received the 40 mg/day dose (70%). Most who got unfractionated heparin received 5,000 U three times a day (87%).
Both types of heparin reduced the risk of all thromboembolic outcomes, and both doses of LMWH significantly reduced the risks. However, the 40 mg/day dose was significantly more effective than the twice-daily 30-mg dose in reducing the risk of VTE and DVT. Risk reductions for PT and mortality were not significantly different between the doses.
Overall, compared with unfractionated heparin, LMWH decreased the risk of VTE by 33%; of PT by 48%; and of DVT by 27%. It also conferred a significant mortality benefit, reducing the risk of death by 37%, compared with the unfractionated type
When Dr. Jacobs grouped the patients according to Injury Severity Score (ISS), he saw a consistently higher benefit among patients with lower scores. For example, LMWH significantly reduced the risk of PT by 59% in patients with an ISS of 5-14. In those with an ISS of 25 or higher, the drug was associated with a 20% increased risk, although that wasn’t statistically significant.
There was a similar finding in DVT. LMWH reduced the risk by 18% in those with an ISS of 5-15, and by 50% among those with an score of 16-24 – both significant reductions. Among those with an ISS of at least 25, the risk was 18% higher, although, again, it was not a significant finding.
Curiously, the mortality benefit was stronger among sicker patients. The benefit was nonsignificant among those with an ISS of less than 25 but for those above 25, the mortality risk reduction was a significant 45%.
Dr Jacobs had no financial disclosures.
msullivan@frontlinemedcom.com
On Twitter @alz_gal
HOLLYWOOD, FLA. – Low-molecular-weight heparin (LMWH) decreased the risk of venous thromboembolism in trauma patients significantly more than did unfractionated heparin, a large state database review has found.
It also was associated with a 37% decrease in overall mortality, compared with unfractionated heparin, Benjamin Jacobs, MD, said at the annual scientific assembly of the Eastern Association for the Surgery of Trauma.
He extracted data describing thromboembolism prophylaxis among 37,868 trauma patients included in the Michigan Trauma Quality Improvement Program from 2012 to 2014. The patients were treated at 23 hospitals around the state. They received either unfractionated or LMWH as their only clot-preventing protocol.
The primary outcomes of the study were reductions in the risk of venous thromboembolism (VTE), deep vein thrombosis (DVT), pulmonary thrombosis (PT), and mortality.
LMWH was given at either 40 mg every day or 30 mg twice a day. The comparator was unfractionated heparin at 5,000 U either two or three times a day.
The preferred method was LMWH, which 83% of patients received, compared with 17% who got the unfractionated heparin. Most patients who got LMWH received the 40 mg/day dose (70%). Most who got unfractionated heparin received 5,000 U three times a day (87%).
Both types of heparin reduced the risk of all thromboembolic outcomes, and both doses of LMWH significantly reduced the risks. However, the 40 mg/day dose was significantly more effective than the twice-daily 30-mg dose in reducing the risk of VTE and DVT. Risk reductions for PT and mortality were not significantly different between the doses.
Overall, compared with unfractionated heparin, LMWH decreased the risk of VTE by 33%; of PT by 48%; and of DVT by 27%. It also conferred a significant mortality benefit, reducing the risk of death by 37%, compared with the unfractionated type
When Dr. Jacobs grouped the patients according to Injury Severity Score (ISS), he saw a consistently higher benefit among patients with lower scores. For example, LMWH significantly reduced the risk of PT by 59% in patients with an ISS of 5-14. In those with an ISS of 25 or higher, the drug was associated with a 20% increased risk, although that wasn’t statistically significant.
There was a similar finding in DVT. LMWH reduced the risk by 18% in those with an ISS of 5-15, and by 50% among those with an score of 16-24 – both significant reductions. Among those with an ISS of at least 25, the risk was 18% higher, although, again, it was not a significant finding.
Curiously, the mortality benefit was stronger among sicker patients. The benefit was nonsignificant among those with an ISS of less than 25 but for those above 25, the mortality risk reduction was a significant 45%.
Dr Jacobs had no financial disclosures.
msullivan@frontlinemedcom.com
On Twitter @alz_gal
HOLLYWOOD, FLA. – Low-molecular-weight heparin (LMWH) decreased the risk of venous thromboembolism in trauma patients significantly more than did unfractionated heparin, a large state database review has found.
It also was associated with a 37% decrease in overall mortality, compared with unfractionated heparin, Benjamin Jacobs, MD, said at the annual scientific assembly of the Eastern Association for the Surgery of Trauma.
He extracted data describing thromboembolism prophylaxis among 37,868 trauma patients included in the Michigan Trauma Quality Improvement Program from 2012 to 2014. The patients were treated at 23 hospitals around the state. They received either unfractionated or LMWH as their only clot-preventing protocol.
The primary outcomes of the study were reductions in the risk of venous thromboembolism (VTE), deep vein thrombosis (DVT), pulmonary thrombosis (PT), and mortality.
LMWH was given at either 40 mg every day or 30 mg twice a day. The comparator was unfractionated heparin at 5,000 U either two or three times a day.
The preferred method was LMWH, which 83% of patients received, compared with 17% who got the unfractionated heparin. Most patients who got LMWH received the 40 mg/day dose (70%). Most who got unfractionated heparin received 5,000 U three times a day (87%).
Both types of heparin reduced the risk of all thromboembolic outcomes, and both doses of LMWH significantly reduced the risks. However, the 40 mg/day dose was significantly more effective than the twice-daily 30-mg dose in reducing the risk of VTE and DVT. Risk reductions for PT and mortality were not significantly different between the doses.
Overall, compared with unfractionated heparin, LMWH decreased the risk of VTE by 33%; of PT by 48%; and of DVT by 27%. It also conferred a significant mortality benefit, reducing the risk of death by 37%, compared with the unfractionated type
When Dr. Jacobs grouped the patients according to Injury Severity Score (ISS), he saw a consistently higher benefit among patients with lower scores. For example, LMWH significantly reduced the risk of PT by 59% in patients with an ISS of 5-14. In those with an ISS of 25 or higher, the drug was associated with a 20% increased risk, although that wasn’t statistically significant.
There was a similar finding in DVT. LMWH reduced the risk by 18% in those with an ISS of 5-15, and by 50% among those with an score of 16-24 – both significant reductions. Among those with an ISS of at least 25, the risk was 18% higher, although, again, it was not a significant finding.
Curiously, the mortality benefit was stronger among sicker patients. The benefit was nonsignificant among those with an ISS of less than 25 but for those above 25, the mortality risk reduction was a significant 45%.
Dr Jacobs had no financial disclosures.
msullivan@frontlinemedcom.com
On Twitter @alz_gal
AT THE EAST ANNUAL SCIENTIFIC ASSEMBLY
Key clinical point:
Major finding: Overall mortality was reduced by 37% with LMWH, compared with unfractionated heparin.
Data source: The review comprised 37,868 patients included in the Michigan Trauma Quality Improvement Program.
Disclosures: Dr. Jacobs had no financial disclosures.