Thrombosis

Stopping aspirin at 24-28 weeks of gestation has no disadvantage, compared with continuing aspirin full term, for preventing preterm preeclampsia in women at high risk of preeclampsia who have a normal fms-like tyrosine kinase 1 to placental growth factor (sFlt-1:PlGF) ratio, a randomized controlled trial has found.

The findings were published online in JAMA.
 

Editorialists advise careful consideration

However, in an accompanying editorial, Ukachi N. Emeruwa, MD, MPH, with the division of maternal fetal medicine, department of obstetrics, gynecology, and reproductive sciences at the University of California, San Diego, and colleagues noted that the questions surrounding continuing or discontinuing aspirin in this high-risk population need further consideration.

They added that the results from this study – conducted in nine maternity hospitals across Spain – are hard to translate for the U.S. population.

In this study, Manel Mendoza, PhD, with the maternal fetal medicine unit, department of obstetrics, at the Universitat Autònoma de Barcelona, and colleagues compared the two approaches because of the potential to mitigate peripartum bleeding by discontinuing aspirin before full term (37 weeks’ gestation) and by an accurate selection of women in the first trimester at higher risk of preeclampsia.
 

Aspirin cuts preterm preeclampsia by 62% in women at high risk

While aspirin might be associated with an increased risk of peripartum bleeding, aspirin has been proven to reduce the incidence of preterm preeclampsia by 62% in pregnant women at high risk of preeclampsia.

In the multicenter, open-label, randomized, phase 3, noninferiority trial, pregnant women who had a high risk of preeclampsia during the first-trimester screening and an sFlt-1:PlGF ratio of 38 or less at 24-28 weeks’ gestation were recruited between Aug. 20, 2019, and Sept. 15, 2021. Of those, 936 were analyzed (473 in the intervention group [stopping aspirin] and 473 in the control group [continuing]).

Screening for risk of preterm preeclampsia included analyzing maternal factors, uterine artery pulsatility index, mean arterial pressure, serum pregnancy-associated plasma protein A, and placental growth factor. Follow-up was until delivery for all participants.

Incidence of preterm preeclampsia was 1.48% in the intervention group (discontinuing aspirin) and 1.73% in the control group (continuing aspirin until 36 weeks of gestation; absolute difference, –0.25%; 95% confidence interval, –1.86% to 1.36%), which indicates noninferiority for stopping aspirin. The bar for noninferiority was less than a 1.9% difference in preterm preeclampsia incidences between groups.

Researchers did find a higher incidence of minor antepartum bleeding in the group that continued aspirin (7.61% in the low-dose aspirin discontinuation group vs. 12.31% in the low-dose aspirin continuation group; absolute difference, –4.70; 95% CI, –8.53 to –0.87).
 

Differences in U.S. guidelines

Dr. Emeruwa and colleagues noted the study challenges a growing body of evidence favoring increasingly widespread use of low-dose aspirin in pregnancy.

They called the study “well designed and provocative,” but wrote that the findings are hard to interpret for a U.S. population. Some key differences in the U.S. preeclampsia prevention guidelines, compared with the practices of the study’s authors, included the reliance on clinical maternal factors in the United States for screening for low-dose aspirin prophylaxis as opposed to molecular biomarkers; a different aspirin dose prescribed in the United States (81 mg daily), compared with international societies (150 mg daily); and a lack of a recommendation in the United States to stop prophylactic low-dose aspirin at 36 weeks.

Dr. Emeruwa and colleagues also questioned the scope of the outcome measure used.

They wrote that limiting outcomes to preterm preeclampsia dims the effects of all types of preeclampsia on perinatal and maternal outcomes and that early-onset preeclampsia at less than 34 weeks “occurs in just 0.38% of pregnancies, while 3%-5% are affected by late-onset preeclampsia.”
 

‘Late-onset preeclampsia has a higher overall impact’

Dr. Emeruwa and colleagues wrote: “Though the odds of adverse perinatal and maternal outcomes are higher with preterm preeclampsia, due to its overall higher incidence, late-onset preeclampsia has a higher overall impact on perinatal and maternal morbidity and mortality.”

The study can inform future U.S. approaches, the editorialists wrote, and build on work already being done in the United States.

The study investigators used biophysical and molecular markers to more accurately assess risk for starting low-dose aspirin prophylaxis in the first trimester and applied a growing body of data showing the high negative predictive value of second-trimester biomarkers.

The editorialists noted that the U.S. Preventive Services Task Force recommendations would have captured “less than 50% of the at-risk population” that Dr. Mendoza’s team found eligible for low-dose aspirin.

Those factors, the editorialists wrote, point to the potential to improve guidelines for personalized preeclampsia management in pregnancy.

They concluded: “U.S. practitioners and professional societies should reconsider current risk assessment strategies, which are largely based on maternal factors, and evaluate whether incorporation of molecular biomarkers would improve maternal and fetal/neonatal outcomes.”

The study authors acknowledged that 92% of participants in the study were White, thus limiting generalizability.

The authors and editorialists reported no relevant financial relationships.

Stopping aspirin at 24-28 weeks of gestation has no disadvantage, compared with continuing aspirin full term, for preventing preterm preeclampsia in women at high risk of preeclampsia who have a normal fms-like tyrosine kinase 1 to placental growth factor (sFlt-1:PlGF) ratio, a randomized controlled trial has found.

The findings were published online in JAMA.
 

Editorialists advise careful consideration

However, in an accompanying editorial, Ukachi N. Emeruwa, MD, MPH, with the division of maternal fetal medicine, department of obstetrics, gynecology, and reproductive sciences at the University of California, San Diego, and colleagues noted that the questions surrounding continuing or discontinuing aspirin in this high-risk population need further consideration.

They added that the results from this study – conducted in nine maternity hospitals across Spain – are hard to translate for the U.S. population.

In this study, Manel Mendoza, PhD, with the maternal fetal medicine unit, department of obstetrics, at the Universitat Autònoma de Barcelona, and colleagues compared the two approaches because of the potential to mitigate peripartum bleeding by discontinuing aspirin before full term (37 weeks’ gestation) and by an accurate selection of women in the first trimester at higher risk of preeclampsia.
 

Aspirin cuts preterm preeclampsia by 62% in women at high risk

While aspirin might be associated with an increased risk of peripartum bleeding, aspirin has been proven to reduce the incidence of preterm preeclampsia by 62% in pregnant women at high risk of preeclampsia.

In the multicenter, open-label, randomized, phase 3, noninferiority trial, pregnant women who had a high risk of preeclampsia during the first-trimester screening and an sFlt-1:PlGF ratio of 38 or less at 24-28 weeks’ gestation were recruited between Aug. 20, 2019, and Sept. 15, 2021. Of those, 936 were analyzed (473 in the intervention group [stopping aspirin] and 473 in the control group [continuing]).

Screening for risk of preterm preeclampsia included analyzing maternal factors, uterine artery pulsatility index, mean arterial pressure, serum pregnancy-associated plasma protein A, and placental growth factor. Follow-up was until delivery for all participants.

Incidence of preterm preeclampsia was 1.48% in the intervention group (discontinuing aspirin) and 1.73% in the control group (continuing aspirin until 36 weeks of gestation; absolute difference, –0.25%; 95% confidence interval, –1.86% to 1.36%), which indicates noninferiority for stopping aspirin. The bar for noninferiority was less than a 1.9% difference in preterm preeclampsia incidences between groups.

Researchers did find a higher incidence of minor antepartum bleeding in the group that continued aspirin (7.61% in the low-dose aspirin discontinuation group vs. 12.31% in the low-dose aspirin continuation group; absolute difference, –4.70; 95% CI, –8.53 to –0.87).
 

Differences in U.S. guidelines

Dr. Emeruwa and colleagues noted the study challenges a growing body of evidence favoring increasingly widespread use of low-dose aspirin in pregnancy.

They called the study “well designed and provocative,” but wrote that the findings are hard to interpret for a U.S. population. Some key differences in the U.S. preeclampsia prevention guidelines, compared with the practices of the study’s authors, included the reliance on clinical maternal factors in the United States for screening for low-dose aspirin prophylaxis as opposed to molecular biomarkers; a different aspirin dose prescribed in the United States (81 mg daily), compared with international societies (150 mg daily); and a lack of a recommendation in the United States to stop prophylactic low-dose aspirin at 36 weeks.

Dr. Emeruwa and colleagues also questioned the scope of the outcome measure used.

They wrote that limiting outcomes to preterm preeclampsia dims the effects of all types of preeclampsia on perinatal and maternal outcomes and that early-onset preeclampsia at less than 34 weeks “occurs in just 0.38% of pregnancies, while 3%-5% are affected by late-onset preeclampsia.”
 

‘Late-onset preeclampsia has a higher overall impact’

Dr. Emeruwa and colleagues wrote: “Though the odds of adverse perinatal and maternal outcomes are higher with preterm preeclampsia, due to its overall higher incidence, late-onset preeclampsia has a higher overall impact on perinatal and maternal morbidity and mortality.”

The study can inform future U.S. approaches, the editorialists wrote, and build on work already being done in the United States.

The study investigators used biophysical and molecular markers to more accurately assess risk for starting low-dose aspirin prophylaxis in the first trimester and applied a growing body of data showing the high negative predictive value of second-trimester biomarkers.

The editorialists noted that the U.S. Preventive Services Task Force recommendations would have captured “less than 50% of the at-risk population” that Dr. Mendoza’s team found eligible for low-dose aspirin.

Those factors, the editorialists wrote, point to the potential to improve guidelines for personalized preeclampsia management in pregnancy.

They concluded: “U.S. practitioners and professional societies should reconsider current risk assessment strategies, which are largely based on maternal factors, and evaluate whether incorporation of molecular biomarkers would improve maternal and fetal/neonatal outcomes.”

The study authors acknowledged that 92% of participants in the study were White, thus limiting generalizability.

The authors and editorialists reported no relevant financial relationships.

Stopping aspirin at 24-28 weeks of gestation has no disadvantage, compared with continuing aspirin full term, for preventing preterm preeclampsia in women at high risk of preeclampsia who have a normal fms-like tyrosine kinase 1 to placental growth factor (sFlt-1:PlGF) ratio, a randomized controlled trial has found.

The findings were published online in JAMA.
 

Editorialists advise careful consideration

However, in an accompanying editorial, Ukachi N. Emeruwa, MD, MPH, with the division of maternal fetal medicine, department of obstetrics, gynecology, and reproductive sciences at the University of California, San Diego, and colleagues noted that the questions surrounding continuing or discontinuing aspirin in this high-risk population need further consideration.

They added that the results from this study – conducted in nine maternity hospitals across Spain – are hard to translate for the U.S. population.

In this study, Manel Mendoza, PhD, with the maternal fetal medicine unit, department of obstetrics, at the Universitat Autònoma de Barcelona, and colleagues compared the two approaches because of the potential to mitigate peripartum bleeding by discontinuing aspirin before full term (37 weeks’ gestation) and by an accurate selection of women in the first trimester at higher risk of preeclampsia.
 

Aspirin cuts preterm preeclampsia by 62% in women at high risk

While aspirin might be associated with an increased risk of peripartum bleeding, aspirin has been proven to reduce the incidence of preterm preeclampsia by 62% in pregnant women at high risk of preeclampsia.

In the multicenter, open-label, randomized, phase 3, noninferiority trial, pregnant women who had a high risk of preeclampsia during the first-trimester screening and an sFlt-1:PlGF ratio of 38 or less at 24-28 weeks’ gestation were recruited between Aug. 20, 2019, and Sept. 15, 2021. Of those, 936 were analyzed (473 in the intervention group [stopping aspirin] and 473 in the control group [continuing]).

Screening for risk of preterm preeclampsia included analyzing maternal factors, uterine artery pulsatility index, mean arterial pressure, serum pregnancy-associated plasma protein A, and placental growth factor. Follow-up was until delivery for all participants.

Incidence of preterm preeclampsia was 1.48% in the intervention group (discontinuing aspirin) and 1.73% in the control group (continuing aspirin until 36 weeks of gestation; absolute difference, –0.25%; 95% confidence interval, –1.86% to 1.36%), which indicates noninferiority for stopping aspirin. The bar for noninferiority was less than a 1.9% difference in preterm preeclampsia incidences between groups.

Researchers did find a higher incidence of minor antepartum bleeding in the group that continued aspirin (7.61% in the low-dose aspirin discontinuation group vs. 12.31% in the low-dose aspirin continuation group; absolute difference, –4.70; 95% CI, –8.53 to –0.87).
 

Differences in U.S. guidelines

Dr. Emeruwa and colleagues noted the study challenges a growing body of evidence favoring increasingly widespread use of low-dose aspirin in pregnancy.

They called the study “well designed and provocative,” but wrote that the findings are hard to interpret for a U.S. population. Some key differences in the U.S. preeclampsia prevention guidelines, compared with the practices of the study’s authors, included the reliance on clinical maternal factors in the United States for screening for low-dose aspirin prophylaxis as opposed to molecular biomarkers; a different aspirin dose prescribed in the United States (81 mg daily), compared with international societies (150 mg daily); and a lack of a recommendation in the United States to stop prophylactic low-dose aspirin at 36 weeks.

Dr. Emeruwa and colleagues also questioned the scope of the outcome measure used.

They wrote that limiting outcomes to preterm preeclampsia dims the effects of all types of preeclampsia on perinatal and maternal outcomes and that early-onset preeclampsia at less than 34 weeks “occurs in just 0.38% of pregnancies, while 3%-5% are affected by late-onset preeclampsia.”
 

‘Late-onset preeclampsia has a higher overall impact’

Dr. Emeruwa and colleagues wrote: “Though the odds of adverse perinatal and maternal outcomes are higher with preterm preeclampsia, due to its overall higher incidence, late-onset preeclampsia has a higher overall impact on perinatal and maternal morbidity and mortality.”

The study can inform future U.S. approaches, the editorialists wrote, and build on work already being done in the United States.

The study investigators used biophysical and molecular markers to more accurately assess risk for starting low-dose aspirin prophylaxis in the first trimester and applied a growing body of data showing the high negative predictive value of second-trimester biomarkers.

The editorialists noted that the U.S. Preventive Services Task Force recommendations would have captured “less than 50% of the at-risk population” that Dr. Mendoza’s team found eligible for low-dose aspirin.

Those factors, the editorialists wrote, point to the potential to improve guidelines for personalized preeclampsia management in pregnancy.

They concluded: “U.S. practitioners and professional societies should reconsider current risk assessment strategies, which are largely based on maternal factors, and evaluate whether incorporation of molecular biomarkers would improve maternal and fetal/neonatal outcomes.”

The study authors acknowledged that 92% of participants in the study were White, thus limiting generalizability.

The authors and editorialists reported no relevant financial relationships.

The American College of Cardiology, the American Heart Association, and the Society for Cardiovascular Angiography and Interventions (SCAI) have jointly issued new guidance outlining competency-based advanced training requirements for interventional cardiology trainees.

It’s the first document of its kind to define the training requirements for the full breadth of interventional cardiology for adults, including coronary interventions, peripheral vascular interventions (PVIs), and structural heart interventions (SHIs), the organizations say.

enot-poloskun/Getty Images

Minimum of 250 procedures

To gain the necessary experience in interventional cardiology, cardiovascular fellows are advised to complete the following:

• A 3-year general cardiovascular disease fellowship (successful completion consists of Level I competency in all aspects of cardiovascular medicine and Level II competency in diagnostic cardiac catheterization to pursue interventional cardiology training);
• A 1-year accredited interventional cardiology fellowship, the focus of which is coronary intervention with the opportunity to gain procedural experience in various aspects of PVI or SHI (Level III competency);
• An option for additional post-fellowship training based on the trainee’s career goals.

The goal of Level III training is to provide the interventional cardiology trainees with a “well-rounded, competency-based education,” including didactic instruction, clinical experience in the diagnosis and care of patients, and hands-on procedural experience, the writing group says.

Competency requirements are defined using the Accreditation Council for Graduate Medical Education’s six “essential” competency domains: medical knowledge; patient care and procedural skills; practice-based learning and improvement; systems-based practice; interpersonal and communication skills; and professionalism.

To support attaining these competencies, the writing committee recommends a minimum of 250 interventional cardiology procedures. Of these, 200 should be coronary procedures, with the remaining 50 specialized in coronary, PVI, or SHI, which allows the fellows to customize training on the basis of their career goals.

Adjunctive procedures related to physiologic assessment and intracoronary imaging are also required (25 of each). “These minimum numbers are meant to provide trainees with exposure to a variety and spectrum of complexity of clinical case material and give supervising faculty sufficient opportunity to evaluate trainees’ competency,” the writing group says.

In addition to their procedural skills, evaluation of interventional cardiology trainee proficiency should include regular assessment of a trainee’s ability to clinically diagnose and manage patients across the broad spectrum of diseases.

Assessment of trainees should involve multiple components, including direct observation by instructors, case logs, chart reviews (including adherence to guideline recommendations, appropriate use criteria, and patient outcomes), simulation training, and assessment of leadership skills.

Trainees must also acquire experience working as part of a multidisciplinary team to provide a holistic approach to patient care. The document also highlights the importance of leadership skills, mentorship and lifelong learning beyond initial training.

The 2023 ACC/AHA/SCAI Advanced Training Statement on Interventional Cardiology (Coronary, Peripheral Vascular, and Structural Heart Interventions) was published online in the Journal of the American College of Cardiology.

The statement was developed in collaboration with and endorsed by the American Association for Thoracic Surgery, the American Society of Echocardiography, the Heart Failure Society of America, the Heart Rhythm Society, the Society of Cardiovascular Anesthesiologists, the Society of Cardiovascular Computed Tomography, the Society for Cardiovascular Magnetic Resonance, the Society of Thoracic Surgeons, and the Society for Vascular Medicine.

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

The American College of Cardiology, the American Heart Association, and the Society for Cardiovascular Angiography and Interventions (SCAI) have jointly issued new guidance outlining competency-based advanced training requirements for interventional cardiology trainees.

It’s the first document of its kind to define the training requirements for the full breadth of interventional cardiology for adults, including coronary interventions, peripheral vascular interventions (PVIs), and structural heart interventions (SHIs), the organizations say.

enot-poloskun/Getty Images

Minimum of 250 procedures

To gain the necessary experience in interventional cardiology, cardiovascular fellows are advised to complete the following:

• A 3-year general cardiovascular disease fellowship (successful completion consists of Level I competency in all aspects of cardiovascular medicine and Level II competency in diagnostic cardiac catheterization to pursue interventional cardiology training);
• A 1-year accredited interventional cardiology fellowship, the focus of which is coronary intervention with the opportunity to gain procedural experience in various aspects of PVI or SHI (Level III competency);
• An option for additional post-fellowship training based on the trainee’s career goals.

The goal of Level III training is to provide the interventional cardiology trainees with a “well-rounded, competency-based education,” including didactic instruction, clinical experience in the diagnosis and care of patients, and hands-on procedural experience, the writing group says.

Competency requirements are defined using the Accreditation Council for Graduate Medical Education’s six “essential” competency domains: medical knowledge; patient care and procedural skills; practice-based learning and improvement; systems-based practice; interpersonal and communication skills; and professionalism.

To support attaining these competencies, the writing committee recommends a minimum of 250 interventional cardiology procedures. Of these, 200 should be coronary procedures, with the remaining 50 specialized in coronary, PVI, or SHI, which allows the fellows to customize training on the basis of their career goals.

Adjunctive procedures related to physiologic assessment and intracoronary imaging are also required (25 of each). “These minimum numbers are meant to provide trainees with exposure to a variety and spectrum of complexity of clinical case material and give supervising faculty sufficient opportunity to evaluate trainees’ competency,” the writing group says.

In addition to their procedural skills, evaluation of interventional cardiology trainee proficiency should include regular assessment of a trainee’s ability to clinically diagnose and manage patients across the broad spectrum of diseases.

Assessment of trainees should involve multiple components, including direct observation by instructors, case logs, chart reviews (including adherence to guideline recommendations, appropriate use criteria, and patient outcomes), simulation training, and assessment of leadership skills.

Trainees must also acquire experience working as part of a multidisciplinary team to provide a holistic approach to patient care. The document also highlights the importance of leadership skills, mentorship and lifelong learning beyond initial training.

The 2023 ACC/AHA/SCAI Advanced Training Statement on Interventional Cardiology (Coronary, Peripheral Vascular, and Structural Heart Interventions) was published online in the Journal of the American College of Cardiology.

The statement was developed in collaboration with and endorsed by the American Association for Thoracic Surgery, the American Society of Echocardiography, the Heart Failure Society of America, the Heart Rhythm Society, the Society of Cardiovascular Anesthesiologists, the Society of Cardiovascular Computed Tomography, the Society for Cardiovascular Magnetic Resonance, the Society of Thoracic Surgeons, and the Society for Vascular Medicine.

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

The American College of Cardiology, the American Heart Association, and the Society for Cardiovascular Angiography and Interventions (SCAI) have jointly issued new guidance outlining competency-based advanced training requirements for interventional cardiology trainees.

It’s the first document of its kind to define the training requirements for the full breadth of interventional cardiology for adults, including coronary interventions, peripheral vascular interventions (PVIs), and structural heart interventions (SHIs), the organizations say.

enot-poloskun/Getty Images

Minimum of 250 procedures

To gain the necessary experience in interventional cardiology, cardiovascular fellows are advised to complete the following:

• A 3-year general cardiovascular disease fellowship (successful completion consists of Level I competency in all aspects of cardiovascular medicine and Level II competency in diagnostic cardiac catheterization to pursue interventional cardiology training);
• A 1-year accredited interventional cardiology fellowship, the focus of which is coronary intervention with the opportunity to gain procedural experience in various aspects of PVI or SHI (Level III competency);
• An option for additional post-fellowship training based on the trainee’s career goals.

The goal of Level III training is to provide the interventional cardiology trainees with a “well-rounded, competency-based education,” including didactic instruction, clinical experience in the diagnosis and care of patients, and hands-on procedural experience, the writing group says.

Competency requirements are defined using the Accreditation Council for Graduate Medical Education’s six “essential” competency domains: medical knowledge; patient care and procedural skills; practice-based learning and improvement; systems-based practice; interpersonal and communication skills; and professionalism.

To support attaining these competencies, the writing committee recommends a minimum of 250 interventional cardiology procedures. Of these, 200 should be coronary procedures, with the remaining 50 specialized in coronary, PVI, or SHI, which allows the fellows to customize training on the basis of their career goals.

Adjunctive procedures related to physiologic assessment and intracoronary imaging are also required (25 of each). “These minimum numbers are meant to provide trainees with exposure to a variety and spectrum of complexity of clinical case material and give supervising faculty sufficient opportunity to evaluate trainees’ competency,” the writing group says.

In addition to their procedural skills, evaluation of interventional cardiology trainee proficiency should include regular assessment of a trainee’s ability to clinically diagnose and manage patients across the broad spectrum of diseases.

Assessment of trainees should involve multiple components, including direct observation by instructors, case logs, chart reviews (including adherence to guideline recommendations, appropriate use criteria, and patient outcomes), simulation training, and assessment of leadership skills.

Trainees must also acquire experience working as part of a multidisciplinary team to provide a holistic approach to patient care. The document also highlights the importance of leadership skills, mentorship and lifelong learning beyond initial training.

The 2023 ACC/AHA/SCAI Advanced Training Statement on Interventional Cardiology (Coronary, Peripheral Vascular, and Structural Heart Interventions) was published online in the Journal of the American College of Cardiology.

The statement was developed in collaboration with and endorsed by the American Association for Thoracic Surgery, the American Society of Echocardiography, the Heart Failure Society of America, the Heart Rhythm Society, the Society of Cardiovascular Anesthesiologists, the Society of Cardiovascular Computed Tomography, the Society for Cardiovascular Magnetic Resonance, the Society of Thoracic Surgeons, and the Society for Vascular Medicine.

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

Butylphthalide, a medication derived from celery seed, may improve outcomes after an acute ischemic stroke when given in addition to thrombolysis or endovascular treatment, a new report suggests.

Patients treated with butylphthalide had fewer severe neurologic symptoms and better function 90 days after the stroke, compared with those receiving placebo.

Butylphthalide is approved and available for use in China, where the study was conducted. However, the medication hasn’t been approved for use by the U.S. Food and Drug Administration.

“Patients who received butylphthalide had less severe neurological symptoms and a better living status at 90 days post stroke, compared to those who received the placebo,” said coauthor Baixue Jia, MD, an attending physician in interventional neuroradiology at the Beijing Tiantan Hospital of Capital Medical University and a faculty member at the China National Clinical Research Center for Neurological Diseases in Beijing. “If the results are confirmed in other trials, this may lead to more options to treat strokes caused by clots.”

The study was presented at the International Stroke Conference presented by the American Stroke Association, a division of the American Heart Association.
 

Studying stroke outcomes

The researchers described butylphthalide as a cerebroprotective drug that was originally extracted from seeds of Apium graveolens. In China, previous studies have shown that the drug has cerebroprotective effects in animal models of ischemia-reperfusion, they noted.

In this randomized, double-blind, placebo-controlled trial, Dr. Jia and colleagues evaluated whether treatment with butylphthalide could improve 90-day outcomes for adults with acute ischemic stroke who received intravenous recombinant tissue plasminogen activator (tPA), endovascular treatment, or both.

The participants were treated at one of 59 medical centers in China between July 2018 and February 2022. Those who had minimal stroke symptoms on their initial exam, defined as a score of 0-3 on the National Institutes of Health Stroke Scale, or had severe stroke symptoms, defined as having a score of 26 or higher on the NIHSS, were excluded from the study.

Along with an initial revascularization intervention chosen by their physician, participants were randomly selected to receive either butylphthalide or a placebo daily for 90 days. The drug was administered through daily intravenous injections for the first 14 days, after which patients received oral capsules for 76 days.

The research team defined the outcomes as “favorable” if a patient fell into one of the following categories 90 days after the stroke: an initially mild to moderate stroke (NIHSS, 4-7) and no symptoms after treatment, defined as a score of 0 on the Modified Rankin Scale (mRS), which measures disability and dependence; an initially moderate to serious stroke (NIHSS, 8-14) and no residual symptoms or mild symptoms that don’t impair the ability to perform routine activities of daily living without assistance (mRS, 0-1); or an initially serious to severe stroke (NIHSS, 15-25) and no remaining symptoms or a slight disability that impairs some activities but allows one to conduct daily living without assistance (mRS, 0-2).

Secondary outcomes included symptomatic intracranial hemorrhage, recurrent stroke, and mortality.

Among the 1,216 participants, 607 were assigned to the treatment group, and 609 were assigned to the placebo group. The average age was 66 years, and 68% were men.

Overall, participants in the butylphthalide group were 70% more likely to have a favorable 90-day outcome, compared with the placebo group. Favorable outcomes occurred in 344 patients (56.7%) in the butylphthalide group, compared with 268 patients (44%) in the placebo group (odds ratio, 1.70; 95% confidence interval, 1.35-2.14; P < .001).

In addition, butylphthalide improved function equally well for the patients who initially received tPA, those who received endovascular treatment, and those who received both tPA and endovascular treatment.

Secondary events, such as recurrent stroke and intracranial hemorrhage, weren’t significantly different between the butylphthalide and placebo groups.
 

Ongoing questions

Dr. Jia and colleagues noted the need to understand how butylphthalide works in the brain. Animal studies have suggested several possible mechanisms, but it remains unclear.

“The next step should be investigating the exact mechanisms of butylphthalide in humans,” Dr. Jia said.

Additional research should assess the medication in other populations, the authors noted, particularly because the study involved participants who received initial treatment with tPA, endovascular treatment, or both. The results may not be generalizable to stroke patients who receive other treatments or to populations outside of China.

“While these are interesting results, this is only one relatively small study on a fairly select population in China. Butylphthalide, a medication initially compounded from celery seed, is not ready for use in standard stroke treatment,” said Daniel Lackland, DrPH, professor of neurology and director of the division of translational neurosciences and population studies at the Medical University of South Carolina, Charleston.

Dr. Lackland, who wasn’t involved with the study, is a member of the American Stroke Association’s Stroke Council. Although butylphthalide was originally extracted from seeds, he noted, it’s not what patients would find commercially available.

“The medication used in this study is not the same as celery seed or celery seed extract supplements,” he said. “Stroke survivors should always consult with their neurologist or healthcare professional regarding diet after a stroke.”

The study was funded by the National Key Technology Research and Development Program of the Ministry of Science and Technology of the People’s Republic of China and Shijiazhuang Pharmaceutical Group dl-3-butylphthalide Pharmaceutical. Several authors are employed with Beijing Tiantan Hospital and the Beijing Institute of Brain Disorders. Dr. Lackland reported no relevant financial relationships.

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

Butylphthalide, a medication derived from celery seed, may improve outcomes after an acute ischemic stroke when given in addition to thrombolysis or endovascular treatment, a new report suggests.

Patients treated with butylphthalide had fewer severe neurologic symptoms and better function 90 days after the stroke, compared with those receiving placebo.

Butylphthalide is approved and available for use in China, where the study was conducted. However, the medication hasn’t been approved for use by the U.S. Food and Drug Administration.

“Patients who received butylphthalide had less severe neurological symptoms and a better living status at 90 days post stroke, compared to those who received the placebo,” said coauthor Baixue Jia, MD, an attending physician in interventional neuroradiology at the Beijing Tiantan Hospital of Capital Medical University and a faculty member at the China National Clinical Research Center for Neurological Diseases in Beijing. “If the results are confirmed in other trials, this may lead to more options to treat strokes caused by clots.”

The study was presented at the International Stroke Conference presented by the American Stroke Association, a division of the American Heart Association.
 

Studying stroke outcomes

The researchers described butylphthalide as a cerebroprotective drug that was originally extracted from seeds of Apium graveolens. In China, previous studies have shown that the drug has cerebroprotective effects in animal models of ischemia-reperfusion, they noted.

In this randomized, double-blind, placebo-controlled trial, Dr. Jia and colleagues evaluated whether treatment with butylphthalide could improve 90-day outcomes for adults with acute ischemic stroke who received intravenous recombinant tissue plasminogen activator (tPA), endovascular treatment, or both.

The participants were treated at one of 59 medical centers in China between July 2018 and February 2022. Those who had minimal stroke symptoms on their initial exam, defined as a score of 0-3 on the National Institutes of Health Stroke Scale, or had severe stroke symptoms, defined as having a score of 26 or higher on the NIHSS, were excluded from the study.

Along with an initial revascularization intervention chosen by their physician, participants were randomly selected to receive either butylphthalide or a placebo daily for 90 days. The drug was administered through daily intravenous injections for the first 14 days, after which patients received oral capsules for 76 days.

The research team defined the outcomes as “favorable” if a patient fell into one of the following categories 90 days after the stroke: an initially mild to moderate stroke (NIHSS, 4-7) and no symptoms after treatment, defined as a score of 0 on the Modified Rankin Scale (mRS), which measures disability and dependence; an initially moderate to serious stroke (NIHSS, 8-14) and no residual symptoms or mild symptoms that don’t impair the ability to perform routine activities of daily living without assistance (mRS, 0-1); or an initially serious to severe stroke (NIHSS, 15-25) and no remaining symptoms or a slight disability that impairs some activities but allows one to conduct daily living without assistance (mRS, 0-2).

Secondary outcomes included symptomatic intracranial hemorrhage, recurrent stroke, and mortality.

Among the 1,216 participants, 607 were assigned to the treatment group, and 609 were assigned to the placebo group. The average age was 66 years, and 68% were men.

Overall, participants in the butylphthalide group were 70% more likely to have a favorable 90-day outcome, compared with the placebo group. Favorable outcomes occurred in 344 patients (56.7%) in the butylphthalide group, compared with 268 patients (44%) in the placebo group (odds ratio, 1.70; 95% confidence interval, 1.35-2.14; P < .001).

In addition, butylphthalide improved function equally well for the patients who initially received tPA, those who received endovascular treatment, and those who received both tPA and endovascular treatment.

Secondary events, such as recurrent stroke and intracranial hemorrhage, weren’t significantly different between the butylphthalide and placebo groups.
 

Ongoing questions

Dr. Jia and colleagues noted the need to understand how butylphthalide works in the brain. Animal studies have suggested several possible mechanisms, but it remains unclear.

“The next step should be investigating the exact mechanisms of butylphthalide in humans,” Dr. Jia said.

Additional research should assess the medication in other populations, the authors noted, particularly because the study involved participants who received initial treatment with tPA, endovascular treatment, or both. The results may not be generalizable to stroke patients who receive other treatments or to populations outside of China.

“While these are interesting results, this is only one relatively small study on a fairly select population in China. Butylphthalide, a medication initially compounded from celery seed, is not ready for use in standard stroke treatment,” said Daniel Lackland, DrPH, professor of neurology and director of the division of translational neurosciences and population studies at the Medical University of South Carolina, Charleston.

Dr. Lackland, who wasn’t involved with the study, is a member of the American Stroke Association’s Stroke Council. Although butylphthalide was originally extracted from seeds, he noted, it’s not what patients would find commercially available.

“The medication used in this study is not the same as celery seed or celery seed extract supplements,” he said. “Stroke survivors should always consult with their neurologist or healthcare professional regarding diet after a stroke.”

The study was funded by the National Key Technology Research and Development Program of the Ministry of Science and Technology of the People’s Republic of China and Shijiazhuang Pharmaceutical Group dl-3-butylphthalide Pharmaceutical. Several authors are employed with Beijing Tiantan Hospital and the Beijing Institute of Brain Disorders. Dr. Lackland reported no relevant financial relationships.

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

Butylphthalide, a medication derived from celery seed, may improve outcomes after an acute ischemic stroke when given in addition to thrombolysis or endovascular treatment, a new report suggests.

Patients treated with butylphthalide had fewer severe neurologic symptoms and better function 90 days after the stroke, compared with those receiving placebo.

Butylphthalide is approved and available for use in China, where the study was conducted. However, the medication hasn’t been approved for use by the U.S. Food and Drug Administration.

“Patients who received butylphthalide had less severe neurological symptoms and a better living status at 90 days post stroke, compared to those who received the placebo,” said coauthor Baixue Jia, MD, an attending physician in interventional neuroradiology at the Beijing Tiantan Hospital of Capital Medical University and a faculty member at the China National Clinical Research Center for Neurological Diseases in Beijing. “If the results are confirmed in other trials, this may lead to more options to treat strokes caused by clots.”

The study was presented at the International Stroke Conference presented by the American Stroke Association, a division of the American Heart Association.
 

Studying stroke outcomes

The researchers described butylphthalide as a cerebroprotective drug that was originally extracted from seeds of Apium graveolens. In China, previous studies have shown that the drug has cerebroprotective effects in animal models of ischemia-reperfusion, they noted.

In this randomized, double-blind, placebo-controlled trial, Dr. Jia and colleagues evaluated whether treatment with butylphthalide could improve 90-day outcomes for adults with acute ischemic stroke who received intravenous recombinant tissue plasminogen activator (tPA), endovascular treatment, or both.

The participants were treated at one of 59 medical centers in China between July 2018 and February 2022. Those who had minimal stroke symptoms on their initial exam, defined as a score of 0-3 on the National Institutes of Health Stroke Scale, or had severe stroke symptoms, defined as having a score of 26 or higher on the NIHSS, were excluded from the study.

Along with an initial revascularization intervention chosen by their physician, participants were randomly selected to receive either butylphthalide or a placebo daily for 90 days. The drug was administered through daily intravenous injections for the first 14 days, after which patients received oral capsules for 76 days.

The research team defined the outcomes as “favorable” if a patient fell into one of the following categories 90 days after the stroke: an initially mild to moderate stroke (NIHSS, 4-7) and no symptoms after treatment, defined as a score of 0 on the Modified Rankin Scale (mRS), which measures disability and dependence; an initially moderate to serious stroke (NIHSS, 8-14) and no residual symptoms or mild symptoms that don’t impair the ability to perform routine activities of daily living without assistance (mRS, 0-1); or an initially serious to severe stroke (NIHSS, 15-25) and no remaining symptoms or a slight disability that impairs some activities but allows one to conduct daily living without assistance (mRS, 0-2).

Secondary outcomes included symptomatic intracranial hemorrhage, recurrent stroke, and mortality.

Among the 1,216 participants, 607 were assigned to the treatment group, and 609 were assigned to the placebo group. The average age was 66 years, and 68% were men.

Overall, participants in the butylphthalide group were 70% more likely to have a favorable 90-day outcome, compared with the placebo group. Favorable outcomes occurred in 344 patients (56.7%) in the butylphthalide group, compared with 268 patients (44%) in the placebo group (odds ratio, 1.70; 95% confidence interval, 1.35-2.14; P < .001).

In addition, butylphthalide improved function equally well for the patients who initially received tPA, those who received endovascular treatment, and those who received both tPA and endovascular treatment.

Secondary events, such as recurrent stroke and intracranial hemorrhage, weren’t significantly different between the butylphthalide and placebo groups.
 

Ongoing questions

Dr. Jia and colleagues noted the need to understand how butylphthalide works in the brain. Animal studies have suggested several possible mechanisms, but it remains unclear.

“The next step should be investigating the exact mechanisms of butylphthalide in humans,” Dr. Jia said.

Additional research should assess the medication in other populations, the authors noted, particularly because the study involved participants who received initial treatment with tPA, endovascular treatment, or both. The results may not be generalizable to stroke patients who receive other treatments or to populations outside of China.

“While these are interesting results, this is only one relatively small study on a fairly select population in China. Butylphthalide, a medication initially compounded from celery seed, is not ready for use in standard stroke treatment,” said Daniel Lackland, DrPH, professor of neurology and director of the division of translational neurosciences and population studies at the Medical University of South Carolina, Charleston.

Dr. Lackland, who wasn’t involved with the study, is a member of the American Stroke Association’s Stroke Council. Although butylphthalide was originally extracted from seeds, he noted, it’s not what patients would find commercially available.

“The medication used in this study is not the same as celery seed or celery seed extract supplements,” he said. “Stroke survivors should always consult with their neurologist or healthcare professional regarding diet after a stroke.”

The study was funded by the National Key Technology Research and Development Program of the Ministry of Science and Technology of the People’s Republic of China and Shijiazhuang Pharmaceutical Group dl-3-butylphthalide Pharmaceutical. Several authors are employed with Beijing Tiantan Hospital and the Beijing Institute of Brain Disorders. Dr. Lackland reported no relevant financial relationships.

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

Hospitalized COVID-19 patients with high troponin levels are twice as likely to have cardiac abnormalities than those with normal troponin, with or without COVID-19, a multicenter U.K. study suggests.

The causes were diverse, myocarditis prevalence was lower than previously reported, and myocardial scar emerged as an independent risk factor for adverse cardiovascular outcomes at 12 months.

“We know that multiorgan involvement in hospitalized patients with COVID-19 is common ... and may result in acute myocardial injury, detected by an increase in cardiac troponin concentrations,” John P. Greenwood, PhD, of the University of Leeds (England), told this news organization. “Elevated cardiac troponin is associated with a worse prognosis.”

“Multiple mechanisms of myocardial injury have been proposed and ... mitigation or prevention strategies likely depend on the underpinning mechanisms,” he said. “The sequelae of scar may predispose to late events.”

The study, published online  in Circulation, also identified a new pattern of microinfarction on cardiac magnetic resonance (CMR) imaging, highlighting the pro-thrombotic nature of SARS-CoV-2, Dr. Greenwood said.
 

Injury patterns different

Three hundred and forty-two patients with COVID-19 and elevated troponin levels (COVID+/troponin+) across 25 centers were enrolled between June 2020 and March 2021 in COVID-HEART, deemed an “urgent public health study” in the United Kingdom. The aim was to characterize myocardial injury and its associations and sequelae in convalescent patients after hospitalization with COVID-19.

Enrollment took place during the Wuhan and Alpha waves of COVID-19: before vaccination and when dexamethasone and anticoagulant protocols were emerging. All participants underwent CMR at a median of 21 days after discharge.

Two prospective control groups also were recruited: 64 patients with COVID-19 and normal troponin levels (COVID+/troponin−) and 113 without COVID-19 or elevated troponin matched by age and cardiovascular comorbidities (COVID−/comorbidity+).

Overall, participants’ median age was 61 years and 69% were men. Common comorbidities included hypertension (47%), obesity (43%), and diabetes (25%).

The frequency of any heart abnormality – for example, left or right ventricular impairment, scar, or pericardial disease – was twice as great (61%) in COVID+/troponin+ cases, compared with controls (36% for COVID+/troponin− patients versus 31% for COVID−/comorbidity+ patients).

Specifically, more cases than controls had ventricular impairment (17.2% vs. 3.1% and 7.1%) or scar (42% vs. 7% and 23%).

The myocardial injury pattern differed between cases and controls, with cases more likely to have infarction (13% vs. 2% and 7%) or microinfarction (9% vs. 0% and 1%).

However, there was no between-group difference in nonischemic scar (13% vs. 5% and 14%).

The prevalence of probable recent myocarditis was 6.7% in cases, compared with 1.7% in controls without COVID-19 – “much lower” than in previous studies, Dr. Greenwood noted.

During follow-up, four COVID+/troponin+ patients (1.2%) died, and 34 (10%) experienced a subsequent major adverse cardiovascular event (MACE; 10.2%), which was similar to controls (6.1%).

Myocardial scar, but not previous COVID-19 infection or troponin level, was an independent predictor of MACE (odds ratio, 2.25).

“These findings suggest that macroangiopathic and microangiopathic thrombosis may be the key pathologic process for myocardial injury in COVID-19 survivors,” the authors conclude.

Dr. Greenwood added, “We are currently analyzing the 6-month follow-up CMR scans, the quality-of-life questionnaires, and the 6-minute walk tests. These will give us great understanding of how the heart repairs after acute myocardial injury associated with COVID-19. It will also allow us to assess the impact on patient quality of life and functional capacity.”
 

‘Tour de force’

James A. de Lemos, MD, co-chair of the American Heart Association’s COVID-19 CVD Registry Steering Committee and a professor of medicine at the University of Texas Southwestern Medical Center, Dallas, said, “This is a tour de force collaboration – obtaining this many MRIs across multiple centers in the pandemic is quite remarkable. The study highlights the multiple different processes that lead to cardiac injury in COVID patients, complements autopsy studies and prior smaller MRI studies, [and] also provides the best data on the rate of myocarditis to date among the subset of COVID patients with cardiac injury.”

Overall, he said, the findings “do support closer follow-up for patients who had COVID and elevated troponins. We need to see follow-up MRI results in this cohort, as well as longer term outcomes. We also need studies on newer, more benign variants that are likely to have lower rates of cardiac injury and even fewer MRI abnormalities.”

Matthias Stuber, PhD, and Aaron L. Baggish, MD, both of Lausanne University Hospital and University of Lausanne, Switzerland, noted in a related editorial, “We are also reminded that the clinical severity of COVID-19 is most often dictated by the presence of pre-existing comorbidity, with antecedent ischemic scar now added to the long list of bad actors. Although not the primary focus of the COVID-HEART study, the question of whether cardiac troponin levels should be checked routinely and universally during the index admission for COVID-19 remains unresolved,” they noted.

“In general, we are most effective as clinicians when we use tests to confirm or rule out the specific disease processes suspected by careful basic clinical assessment rather than in a shotgun manner among undifferentiated all-comers,” they conclude.

No commercial funding or relevant financial relationships were reported.

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

Hospitalized COVID-19 patients with high troponin levels are twice as likely to have cardiac abnormalities than those with normal troponin, with or without COVID-19, a multicenter U.K. study suggests.

The causes were diverse, myocarditis prevalence was lower than previously reported, and myocardial scar emerged as an independent risk factor for adverse cardiovascular outcomes at 12 months.

“We know that multiorgan involvement in hospitalized patients with COVID-19 is common ... and may result in acute myocardial injury, detected by an increase in cardiac troponin concentrations,” John P. Greenwood, PhD, of the University of Leeds (England), told this news organization. “Elevated cardiac troponin is associated with a worse prognosis.”

“Multiple mechanisms of myocardial injury have been proposed and ... mitigation or prevention strategies likely depend on the underpinning mechanisms,” he said. “The sequelae of scar may predispose to late events.”

The study, published online  in Circulation, also identified a new pattern of microinfarction on cardiac magnetic resonance (CMR) imaging, highlighting the pro-thrombotic nature of SARS-CoV-2, Dr. Greenwood said.
 

Injury patterns different

Three hundred and forty-two patients with COVID-19 and elevated troponin levels (COVID+/troponin+) across 25 centers were enrolled between June 2020 and March 2021 in COVID-HEART, deemed an “urgent public health study” in the United Kingdom. The aim was to characterize myocardial injury and its associations and sequelae in convalescent patients after hospitalization with COVID-19.

Enrollment took place during the Wuhan and Alpha waves of COVID-19: before vaccination and when dexamethasone and anticoagulant protocols were emerging. All participants underwent CMR at a median of 21 days after discharge.

Two prospective control groups also were recruited: 64 patients with COVID-19 and normal troponin levels (COVID+/troponin−) and 113 without COVID-19 or elevated troponin matched by age and cardiovascular comorbidities (COVID−/comorbidity+).

Overall, participants’ median age was 61 years and 69% were men. Common comorbidities included hypertension (47%), obesity (43%), and diabetes (25%).

The frequency of any heart abnormality – for example, left or right ventricular impairment, scar, or pericardial disease – was twice as great (61%) in COVID+/troponin+ cases, compared with controls (36% for COVID+/troponin− patients versus 31% for COVID−/comorbidity+ patients).

Specifically, more cases than controls had ventricular impairment (17.2% vs. 3.1% and 7.1%) or scar (42% vs. 7% and 23%).

The myocardial injury pattern differed between cases and controls, with cases more likely to have infarction (13% vs. 2% and 7%) or microinfarction (9% vs. 0% and 1%).

However, there was no between-group difference in nonischemic scar (13% vs. 5% and 14%).

The prevalence of probable recent myocarditis was 6.7% in cases, compared with 1.7% in controls without COVID-19 – “much lower” than in previous studies, Dr. Greenwood noted.

During follow-up, four COVID+/troponin+ patients (1.2%) died, and 34 (10%) experienced a subsequent major adverse cardiovascular event (MACE; 10.2%), which was similar to controls (6.1%).

Myocardial scar, but not previous COVID-19 infection or troponin level, was an independent predictor of MACE (odds ratio, 2.25).

“These findings suggest that macroangiopathic and microangiopathic thrombosis may be the key pathologic process for myocardial injury in COVID-19 survivors,” the authors conclude.

Dr. Greenwood added, “We are currently analyzing the 6-month follow-up CMR scans, the quality-of-life questionnaires, and the 6-minute walk tests. These will give us great understanding of how the heart repairs after acute myocardial injury associated with COVID-19. It will also allow us to assess the impact on patient quality of life and functional capacity.”
 

‘Tour de force’

James A. de Lemos, MD, co-chair of the American Heart Association’s COVID-19 CVD Registry Steering Committee and a professor of medicine at the University of Texas Southwestern Medical Center, Dallas, said, “This is a tour de force collaboration – obtaining this many MRIs across multiple centers in the pandemic is quite remarkable. The study highlights the multiple different processes that lead to cardiac injury in COVID patients, complements autopsy studies and prior smaller MRI studies, [and] also provides the best data on the rate of myocarditis to date among the subset of COVID patients with cardiac injury.”

Overall, he said, the findings “do support closer follow-up for patients who had COVID and elevated troponins. We need to see follow-up MRI results in this cohort, as well as longer term outcomes. We also need studies on newer, more benign variants that are likely to have lower rates of cardiac injury and even fewer MRI abnormalities.”

Matthias Stuber, PhD, and Aaron L. Baggish, MD, both of Lausanne University Hospital and University of Lausanne, Switzerland, noted in a related editorial, “We are also reminded that the clinical severity of COVID-19 is most often dictated by the presence of pre-existing comorbidity, with antecedent ischemic scar now added to the long list of bad actors. Although not the primary focus of the COVID-HEART study, the question of whether cardiac troponin levels should be checked routinely and universally during the index admission for COVID-19 remains unresolved,” they noted.

“In general, we are most effective as clinicians when we use tests to confirm or rule out the specific disease processes suspected by careful basic clinical assessment rather than in a shotgun manner among undifferentiated all-comers,” they conclude.

No commercial funding or relevant financial relationships were reported.

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

Hospitalized COVID-19 patients with high troponin levels are twice as likely to have cardiac abnormalities than those with normal troponin, with or without COVID-19, a multicenter U.K. study suggests.

The causes were diverse, myocarditis prevalence was lower than previously reported, and myocardial scar emerged as an independent risk factor for adverse cardiovascular outcomes at 12 months.

“We know that multiorgan involvement in hospitalized patients with COVID-19 is common ... and may result in acute myocardial injury, detected by an increase in cardiac troponin concentrations,” John P. Greenwood, PhD, of the University of Leeds (England), told this news organization. “Elevated cardiac troponin is associated with a worse prognosis.”

“Multiple mechanisms of myocardial injury have been proposed and ... mitigation or prevention strategies likely depend on the underpinning mechanisms,” he said. “The sequelae of scar may predispose to late events.”

The study, published online  in Circulation, also identified a new pattern of microinfarction on cardiac magnetic resonance (CMR) imaging, highlighting the pro-thrombotic nature of SARS-CoV-2, Dr. Greenwood said.
 

Injury patterns different

Three hundred and forty-two patients with COVID-19 and elevated troponin levels (COVID+/troponin+) across 25 centers were enrolled between June 2020 and March 2021 in COVID-HEART, deemed an “urgent public health study” in the United Kingdom. The aim was to characterize myocardial injury and its associations and sequelae in convalescent patients after hospitalization with COVID-19.

Enrollment took place during the Wuhan and Alpha waves of COVID-19: before vaccination and when dexamethasone and anticoagulant protocols were emerging. All participants underwent CMR at a median of 21 days after discharge.

Two prospective control groups also were recruited: 64 patients with COVID-19 and normal troponin levels (COVID+/troponin−) and 113 without COVID-19 or elevated troponin matched by age and cardiovascular comorbidities (COVID−/comorbidity+).

Overall, participants’ median age was 61 years and 69% were men. Common comorbidities included hypertension (47%), obesity (43%), and diabetes (25%).

The frequency of any heart abnormality – for example, left or right ventricular impairment, scar, or pericardial disease – was twice as great (61%) in COVID+/troponin+ cases, compared with controls (36% for COVID+/troponin− patients versus 31% for COVID−/comorbidity+ patients).

Specifically, more cases than controls had ventricular impairment (17.2% vs. 3.1% and 7.1%) or scar (42% vs. 7% and 23%).

The myocardial injury pattern differed between cases and controls, with cases more likely to have infarction (13% vs. 2% and 7%) or microinfarction (9% vs. 0% and 1%).

However, there was no between-group difference in nonischemic scar (13% vs. 5% and 14%).

The prevalence of probable recent myocarditis was 6.7% in cases, compared with 1.7% in controls without COVID-19 – “much lower” than in previous studies, Dr. Greenwood noted.

During follow-up, four COVID+/troponin+ patients (1.2%) died, and 34 (10%) experienced a subsequent major adverse cardiovascular event (MACE; 10.2%), which was similar to controls (6.1%).

Myocardial scar, but not previous COVID-19 infection or troponin level, was an independent predictor of MACE (odds ratio, 2.25).

“These findings suggest that macroangiopathic and microangiopathic thrombosis may be the key pathologic process for myocardial injury in COVID-19 survivors,” the authors conclude.

Dr. Greenwood added, “We are currently analyzing the 6-month follow-up CMR scans, the quality-of-life questionnaires, and the 6-minute walk tests. These will give us great understanding of how the heart repairs after acute myocardial injury associated with COVID-19. It will also allow us to assess the impact on patient quality of life and functional capacity.”
 

‘Tour de force’

James A. de Lemos, MD, co-chair of the American Heart Association’s COVID-19 CVD Registry Steering Committee and a professor of medicine at the University of Texas Southwestern Medical Center, Dallas, said, “This is a tour de force collaboration – obtaining this many MRIs across multiple centers in the pandemic is quite remarkable. The study highlights the multiple different processes that lead to cardiac injury in COVID patients, complements autopsy studies and prior smaller MRI studies, [and] also provides the best data on the rate of myocarditis to date among the subset of COVID patients with cardiac injury.”

Overall, he said, the findings “do support closer follow-up for patients who had COVID and elevated troponins. We need to see follow-up MRI results in this cohort, as well as longer term outcomes. We also need studies on newer, more benign variants that are likely to have lower rates of cardiac injury and even fewer MRI abnormalities.”

Matthias Stuber, PhD, and Aaron L. Baggish, MD, both of Lausanne University Hospital and University of Lausanne, Switzerland, noted in a related editorial, “We are also reminded that the clinical severity of COVID-19 is most often dictated by the presence of pre-existing comorbidity, with antecedent ischemic scar now added to the long list of bad actors. Although not the primary focus of the COVID-HEART study, the question of whether cardiac troponin levels should be checked routinely and universally during the index admission for COVID-19 remains unresolved,” they noted.

“In general, we are most effective as clinicians when we use tests to confirm or rule out the specific disease processes suspected by careful basic clinical assessment rather than in a shotgun manner among undifferentiated all-comers,” they conclude.

No commercial funding or relevant financial relationships were reported.

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

In the STROKE AF study, among patients who had a stroke presumably caused by atherosclerosis, the rate of atrial fibrillation (AFib) was almost 22% at 3 years, as detected by continuous monitoring.

The 3-year results from the study were presented by Lee H. Schwamm, MD, of Massachusetts General Hospital, Boston, at the International Stroke Conference presented by the American Stroke Association, a division of the American Heart Association.

Dr. Schwamm said the high rate of AFib detection in this study suggests that continuous monitoring for AFib should be considered for a larger population of stroke patients, rather than just those with cryptogenic stroke.

“We found a much higher rate of AF[ib] than we expected in this population of patients who have had an atherosclerotic stroke,” Dr. Schwamm said in an interview.

“These AF[ib] occurrences were found by a device, so they are known as ‘device-documented AF[ib].’ The patient is not generally aware of symptoms, but 67% of the AF[ib] episodes lasted for more than 1 hour, showing that this is not trivial AF[ib]. This is meaningful AF[ib],” he said.

Dr. Schwamm said the major question is whether these cases of AFib that are detected with a device warrant treatment with anticoagulation. He noted that, in this study, clinicians decided to provide anticoagulation to 70%-80% of patients in whom AFib was detected.

“If we think it deserves treatment, then we have to look for it. And if we care about finding AF[ib], we have no choice but to monitor continuously,” he said.

“If this data doesn’t convince you that AF[ib] is present in this population, I don’t think any data will. Because it is consistent, it accumulates over time and looks remarkably similar to a set of data that we have all become very comfortable with – the CRYSTAL-AF study in patients with cryptogenic stroke,” he stated.

Dr. Schwamm noted that the STROKE AF trial was not based on the cause of the index stroke; rather, it was asking whether there are risk factors that could contribute to the 25% stroke recurrence rate in this population that are not covered in current guidelines.

“I’m really trying to move away from the anchor that I was trained in, which is to figure out the cause of the last stroke to help decide how to prevent the next stroke, towards more of a probabilistic model – of what is all the information I have at my disposal and how do I act on it to prevent the next stroke? We have to start thinking differently about building models for future stroke risk and determining therapy based on that,” he commented.
 

Changing practice

ISC 2023 program chair Tudor Jovin, MD, Cooper Neurological Institute, Cherry Hill, N.J., and moderator of the session at which the results were presented, discussed the STROKE AF results in a highlights presentation.

“To me as clinician, these results are even more relevant than those at 12 months,” Dr. Jovin said. “The lesson I took is that AF[ib] is even more prevalent than we thought. The burden of AF[ib] is significant in these patients, and it doesn’t seem to be limited to a particular time. These are very thought-provoking results which are going to change clinical practice. I think the threshold for long-term monitoring will be lower.”

Comoderator Lauren Sansing, MD, Yale University, New Haven, Conn., added: “This study shows that the longer we monitor, the more patients with AF[ib] we are likely to pick up. And because in two-thirds of patients with AF[ib], it lasted longer than 1 hour, I do believe this was clinically relevant AF[ib]. The question now is, do we monitor everyone? I think it puts the burden on us to search for AF[ib] in our patients.”

In his presentation, Dr. Schwamm explained that, on the basis of the CRYSTAL-AF study, insertable cardiac monitoring devices are frequently used to identify poststroke AFib in patients with cryptogenic stroke. In the device-monitored arm of that study, AFib was detected in 12.4% of patients over 12 months versus 2.0% in the control arm.

“However, we don’t know how often AF[ib] is detected in other presumed stroke types – largely those due to atherosclerosis,” he said.

He pointed out that, at present, long-term monitoring post stroke for the detection of AFib is not currently recommended for patients with ischemic stroke, owing to presumed small-vessel occlusion or large-artery atherosclerosis.

“In these patients, we are not suspecting AF[ib] because we believe the cause of the stroke was not embolic. But we wanted to investigate what the AF[ib] risk is in these patients, who often have multiple stroke risk factors,” he said.

The trial enrolled 496 patients at 33 centers in the United States. Eligible patients were aged 60 years or older or aged 50-59 years with at least one additional stroke risk factor and had an index stroke that was attributed to large-artery or small-vessel disease. Patients were randomly assigned either to continuous monitoring with the Reveal LINQ device (Medtronic) or to the control arm following site-specific standard of care for AFib detection.

Dr. Schwamm noted that usual care for these patients normally involves monitoring for just a few days while in hospital, but this picks up less than 5% of AFib occurrences.

Baseline characteristics of patients in the STROKE AF study showed that the enrolled population was at high risk for stroke, with a CHADSVASC score of 5. But the index strokes were generally small; the median National Institutes of Health Stroke Scale score was 2.

Results at 12 months, reported 2 years ago, showed a 12.5% incidence of AFib with continuous monitoring versus 1.8% with standard of care (hazard ratio, 7.7; P < .001), rates similar to that found in the CRYSTAL-AF study.

By 3 years, the rate of detected AFib had risen to 21.7% in the continuous monitoring arm versus 2.4% in the control arm (HR, 10.0; P < .001).

“At 12 months, we were seven times more likely to detect AF[ib] with continuous monitoring in these patients, and by 3 years, it was 10 times more likely that AF would be detected with continuous monitoring. I think we’ve settled the question of the best way to find AF[ib] in these patients – it is with an inserted device,” Dr. Schwamm said.

“We have also shown that this is not a transient rise in AFib after the stroke which then diminishes over the next few years. It is a continuous and progressive detection of AF[ib].”

Dr. Schwamm pointed out that 88% of the recorded AFib episodes were asymptomatic. “So relying on patients self-reporting symptoms when deciding who to monitor is unreliable and not a sensible strategy.”

The median time to the first adjudicated AFib episode at 12-month follow-up was 99 days; at the 3-year follow-up, it was 284 days.

“This shows that 30 days of monitoring with an external patch is not sufficient to exclude the presence of AF[ib]. And this really argues for a strategy of immediate insertion of cardiac monitor placement if your goal is to look for AF[ib],” Dr. Schwamm commented.
 

Is this clinically relevant AFib?

Dr. Schwamm acknowledged that there is a question of whether device-detected AFib should be thought about in the same way as clinically detected AFib with respect to future stroke risk.

He noted that, in this study, 67.4% of patients for whom AFib was detected by continuous monitoring (31 of 46 patients) had at least one episode of AFib that lasted more than 1 hour.

“This is not a trivial little squiggle of something on an EKG which then goes away. This is of significant duration that the cardiologist who adjudicated these rhythm strips felt confident was AF[ib].”

He added: “AF[ib] lasting more than 1 hour crosses the threshold for most practitioners I know to feel confident in treating the patient with anticoagulation. If it was symptomatic AF, this wouldn’t even be a question.”

Dr. Schwamm made the point that device-detected A AFib F has been accepted as worthy of treatment in patients after cryptogenic stroke.

“If we are honest with ourselves and if we have no hesitation in starting anticoagulation in a patient with cryptogenic stroke who has had device-detected AF 6 months later, should we decide that if the patient has had a lacunar stroke, we can ignore that same device-detected fibrillation?”

He put forward the idea that, at some level, all stroke is cryptogenic. “We never know for sure what the cause was. We have hypotheses, we have associations, but we don’t really know. So how much should we weigh that presumptive etiology in terms of how we interpret a rhythm disturbance of fibrillation?”

When looking for predictors of AFib in this study, the investigators found that patients were more likely to have an episode of AFib detected if they had one of the four following risk factors: congestive heart failure, left atrial enlargement, obesity, or QRS prolongation.

“In patients with any one of those four factors, 30% of those had device-detected AF[ib]. These are same predictors of AF[ib] that we are all accustomed to,” Dr. Schwamm said.
 

Shared decision-making

Dr. Schwamm said in an interview that, in his practice, for these patients, the decision as to whether to use continuous monitoring is made with the patient through shared decision-making.

“We discuss the chance that they could have AF[ib], and I suggest that it might be worth looking for it, but there are factors to be considered. There is a cost to the device, and reimbursement may depend on insurance coverage. Also, some patients may have strong feelings about having the chip implanted in their body.”

He says implanting the chip is easy. “It takes longer to check in at the front desk than to put the device in. It is injected under the skin. It just needs two stitches and a Band-Aid.” The device connects with a smartphone, and the results are interpreted by a cardiologist.

Dr. Schwamm pointed out that the optimal antithrombotic regimen for these patients in whom AFib is detected remains uncertain and should be the focus of future research.

“Do we just stick to antiplatelet therapy or advance to anticoagulation? In moving to an anticoagulant, are we providing less effective prevention for the atherosclerotic stroke risk at the expense of reducing the AF[ib]-related stroke risk? That may be a reasonable trade-off because we know the disability from AF[ib]-associated stroke is much higher.

“Or perhaps the optimal therapy is aspirin plus low-dose anticoagulant? Or left atrial appendage closure and an antiplatelet for patients at a higher risk of bleeding?” he said. “These are the really important questions we need to start asking.”

He added that he hopes a future study will address these questions, but he noted that it would have to be a large study, that it would have to first identify these patients and then randomly assign them to anticoagulation or to no treatment. “That is quite a major undertaking.”

In the highlights presentation, Dr. Jovin said he was uncertain of which of these patients in whom AFib is detected would benefit from anticoagulation. He said he would also like to see a randomized trial on this. But he added: “This would be challenging, as there is the issue of whether there would be equipoise to allow us to randomize to a placebo.”

Dr. Sansing agreed. “I think it would be a hard sell. I would have to think carefully about randomizing a patient to anticoagulation therapy or no therapy who has been found to have AF[ib].”

Dr. Schwamm noted that the current STROKE-AF study was not designed or powered to detect differences in stroke recurrence rates and that there was no difference in stroke recurrence rates between the two arms. There was also no randomization with regard to treatment; choice of medication was left to the discretion of the treating physician.

But he noted that only for 3 of the 34 patients with recurrent stroke in the continuous-monitor arm was AFib detected prior to the recurrent stroke, and only one of those three was receiving anticoagulation at the time of the recurrent stroke.

“These strokes were occurring in patients who did not have device-detected AF[ib],” Dr. Schwamm said. “This is because the population in this study were loaded with stroke risk factors and are at risk of recurrent stroke, but we don’t have the opportunity in this study to really understand the significance of the recurrent strokes.”

The STROKE AF trial was funded by Medtronic. Dr. Schwamm is a consultant to Medtronic.

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

In the STROKE AF study, among patients who had a stroke presumably caused by atherosclerosis, the rate of atrial fibrillation (AFib) was almost 22% at 3 years, as detected by continuous monitoring.

The 3-year results from the study were presented by Lee H. Schwamm, MD, of Massachusetts General Hospital, Boston, at the International Stroke Conference presented by the American Stroke Association, a division of the American Heart Association.

Dr. Schwamm said the high rate of AFib detection in this study suggests that continuous monitoring for AFib should be considered for a larger population of stroke patients, rather than just those with cryptogenic stroke.

“We found a much higher rate of AF[ib] than we expected in this population of patients who have had an atherosclerotic stroke,” Dr. Schwamm said in an interview.

“These AF[ib] occurrences were found by a device, so they are known as ‘device-documented AF[ib].’ The patient is not generally aware of symptoms, but 67% of the AF[ib] episodes lasted for more than 1 hour, showing that this is not trivial AF[ib]. This is meaningful AF[ib],” he said.

Dr. Schwamm said the major question is whether these cases of AFib that are detected with a device warrant treatment with anticoagulation. He noted that, in this study, clinicians decided to provide anticoagulation to 70%-80% of patients in whom AFib was detected.

“If we think it deserves treatment, then we have to look for it. And if we care about finding AF[ib], we have no choice but to monitor continuously,” he said.

“If this data doesn’t convince you that AF[ib] is present in this population, I don’t think any data will. Because it is consistent, it accumulates over time and looks remarkably similar to a set of data that we have all become very comfortable with – the CRYSTAL-AF study in patients with cryptogenic stroke,” he stated.

Dr. Schwamm noted that the STROKE AF trial was not based on the cause of the index stroke; rather, it was asking whether there are risk factors that could contribute to the 25% stroke recurrence rate in this population that are not covered in current guidelines.

“I’m really trying to move away from the anchor that I was trained in, which is to figure out the cause of the last stroke to help decide how to prevent the next stroke, towards more of a probabilistic model – of what is all the information I have at my disposal and how do I act on it to prevent the next stroke? We have to start thinking differently about building models for future stroke risk and determining therapy based on that,” he commented.
 

Changing practice

ISC 2023 program chair Tudor Jovin, MD, Cooper Neurological Institute, Cherry Hill, N.J., and moderator of the session at which the results were presented, discussed the STROKE AF results in a highlights presentation.

“To me as clinician, these results are even more relevant than those at 12 months,” Dr. Jovin said. “The lesson I took is that AF[ib] is even more prevalent than we thought. The burden of AF[ib] is significant in these patients, and it doesn’t seem to be limited to a particular time. These are very thought-provoking results which are going to change clinical practice. I think the threshold for long-term monitoring will be lower.”

Comoderator Lauren Sansing, MD, Yale University, New Haven, Conn., added: “This study shows that the longer we monitor, the more patients with AF[ib] we are likely to pick up. And because in two-thirds of patients with AF[ib], it lasted longer than 1 hour, I do believe this was clinically relevant AF[ib]. The question now is, do we monitor everyone? I think it puts the burden on us to search for AF[ib] in our patients.”

In his presentation, Dr. Schwamm explained that, on the basis of the CRYSTAL-AF study, insertable cardiac monitoring devices are frequently used to identify poststroke AFib in patients with cryptogenic stroke. In the device-monitored arm of that study, AFib was detected in 12.4% of patients over 12 months versus 2.0% in the control arm.

“However, we don’t know how often AF[ib] is detected in other presumed stroke types – largely those due to atherosclerosis,” he said.

He pointed out that, at present, long-term monitoring post stroke for the detection of AFib is not currently recommended for patients with ischemic stroke, owing to presumed small-vessel occlusion or large-artery atherosclerosis.

“In these patients, we are not suspecting AF[ib] because we believe the cause of the stroke was not embolic. But we wanted to investigate what the AF[ib] risk is in these patients, who often have multiple stroke risk factors,” he said.

The trial enrolled 496 patients at 33 centers in the United States. Eligible patients were aged 60 years or older or aged 50-59 years with at least one additional stroke risk factor and had an index stroke that was attributed to large-artery or small-vessel disease. Patients were randomly assigned either to continuous monitoring with the Reveal LINQ device (Medtronic) or to the control arm following site-specific standard of care for AFib detection.

Dr. Schwamm noted that usual care for these patients normally involves monitoring for just a few days while in hospital, but this picks up less than 5% of AFib occurrences.

Baseline characteristics of patients in the STROKE AF study showed that the enrolled population was at high risk for stroke, with a CHADSVASC score of 5. But the index strokes were generally small; the median National Institutes of Health Stroke Scale score was 2.

Results at 12 months, reported 2 years ago, showed a 12.5% incidence of AFib with continuous monitoring versus 1.8% with standard of care (hazard ratio, 7.7; P < .001), rates similar to that found in the CRYSTAL-AF study.

By 3 years, the rate of detected AFib had risen to 21.7% in the continuous monitoring arm versus 2.4% in the control arm (HR, 10.0; P < .001).

“At 12 months, we were seven times more likely to detect AF[ib] with continuous monitoring in these patients, and by 3 years, it was 10 times more likely that AF would be detected with continuous monitoring. I think we’ve settled the question of the best way to find AF[ib] in these patients – it is with an inserted device,” Dr. Schwamm said.

“We have also shown that this is not a transient rise in AFib after the stroke which then diminishes over the next few years. It is a continuous and progressive detection of AF[ib].”

Dr. Schwamm pointed out that 88% of the recorded AFib episodes were asymptomatic. “So relying on patients self-reporting symptoms when deciding who to monitor is unreliable and not a sensible strategy.”

The median time to the first adjudicated AFib episode at 12-month follow-up was 99 days; at the 3-year follow-up, it was 284 days.

“This shows that 30 days of monitoring with an external patch is not sufficient to exclude the presence of AF[ib]. And this really argues for a strategy of immediate insertion of cardiac monitor placement if your goal is to look for AF[ib],” Dr. Schwamm commented.
 

Is this clinically relevant AFib?

Dr. Schwamm acknowledged that there is a question of whether device-detected AFib should be thought about in the same way as clinically detected AFib with respect to future stroke risk.

He noted that, in this study, 67.4% of patients for whom AFib was detected by continuous monitoring (31 of 46 patients) had at least one episode of AFib that lasted more than 1 hour.

“This is not a trivial little squiggle of something on an EKG which then goes away. This is of significant duration that the cardiologist who adjudicated these rhythm strips felt confident was AF[ib].”

He added: “AF[ib] lasting more than 1 hour crosses the threshold for most practitioners I know to feel confident in treating the patient with anticoagulation. If it was symptomatic AF, this wouldn’t even be a question.”

Dr. Schwamm made the point that device-detected A AFib F has been accepted as worthy of treatment in patients after cryptogenic stroke.

“If we are honest with ourselves and if we have no hesitation in starting anticoagulation in a patient with cryptogenic stroke who has had device-detected AF 6 months later, should we decide that if the patient has had a lacunar stroke, we can ignore that same device-detected fibrillation?”

He put forward the idea that, at some level, all stroke is cryptogenic. “We never know for sure what the cause was. We have hypotheses, we have associations, but we don’t really know. So how much should we weigh that presumptive etiology in terms of how we interpret a rhythm disturbance of fibrillation?”

When looking for predictors of AFib in this study, the investigators found that patients were more likely to have an episode of AFib detected if they had one of the four following risk factors: congestive heart failure, left atrial enlargement, obesity, or QRS prolongation.

“In patients with any one of those four factors, 30% of those had device-detected AF[ib]. These are same predictors of AF[ib] that we are all accustomed to,” Dr. Schwamm said.
 

Shared decision-making

Dr. Schwamm said in an interview that, in his practice, for these patients, the decision as to whether to use continuous monitoring is made with the patient through shared decision-making.

“We discuss the chance that they could have AF[ib], and I suggest that it might be worth looking for it, but there are factors to be considered. There is a cost to the device, and reimbursement may depend on insurance coverage. Also, some patients may have strong feelings about having the chip implanted in their body.”

He says implanting the chip is easy. “It takes longer to check in at the front desk than to put the device in. It is injected under the skin. It just needs two stitches and a Band-Aid.” The device connects with a smartphone, and the results are interpreted by a cardiologist.

Dr. Schwamm pointed out that the optimal antithrombotic regimen for these patients in whom AFib is detected remains uncertain and should be the focus of future research.

“Do we just stick to antiplatelet therapy or advance to anticoagulation? In moving to an anticoagulant, are we providing less effective prevention for the atherosclerotic stroke risk at the expense of reducing the AF[ib]-related stroke risk? That may be a reasonable trade-off because we know the disability from AF[ib]-associated stroke is much higher.

“Or perhaps the optimal therapy is aspirin plus low-dose anticoagulant? Or left atrial appendage closure and an antiplatelet for patients at a higher risk of bleeding?” he said. “These are the really important questions we need to start asking.”

He added that he hopes a future study will address these questions, but he noted that it would have to be a large study, that it would have to first identify these patients and then randomly assign them to anticoagulation or to no treatment. “That is quite a major undertaking.”

In the highlights presentation, Dr. Jovin said he was uncertain of which of these patients in whom AFib is detected would benefit from anticoagulation. He said he would also like to see a randomized trial on this. But he added: “This would be challenging, as there is the issue of whether there would be equipoise to allow us to randomize to a placebo.”

Dr. Sansing agreed. “I think it would be a hard sell. I would have to think carefully about randomizing a patient to anticoagulation therapy or no therapy who has been found to have AF[ib].”

Dr. Schwamm noted that the current STROKE-AF study was not designed or powered to detect differences in stroke recurrence rates and that there was no difference in stroke recurrence rates between the two arms. There was also no randomization with regard to treatment; choice of medication was left to the discretion of the treating physician.

But he noted that only for 3 of the 34 patients with recurrent stroke in the continuous-monitor arm was AFib detected prior to the recurrent stroke, and only one of those three was receiving anticoagulation at the time of the recurrent stroke.

“These strokes were occurring in patients who did not have device-detected AF[ib],” Dr. Schwamm said. “This is because the population in this study were loaded with stroke risk factors and are at risk of recurrent stroke, but we don’t have the opportunity in this study to really understand the significance of the recurrent strokes.”

The STROKE AF trial was funded by Medtronic. Dr. Schwamm is a consultant to Medtronic.

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

In the STROKE AF study, among patients who had a stroke presumably caused by atherosclerosis, the rate of atrial fibrillation (AFib) was almost 22% at 3 years, as detected by continuous monitoring.

The 3-year results from the study were presented by Lee H. Schwamm, MD, of Massachusetts General Hospital, Boston, at the International Stroke Conference presented by the American Stroke Association, a division of the American Heart Association.

Dr. Schwamm said the high rate of AFib detection in this study suggests that continuous monitoring for AFib should be considered for a larger population of stroke patients, rather than just those with cryptogenic stroke.

“We found a much higher rate of AF[ib] than we expected in this population of patients who have had an atherosclerotic stroke,” Dr. Schwamm said in an interview.

“These AF[ib] occurrences were found by a device, so they are known as ‘device-documented AF[ib].’ The patient is not generally aware of symptoms, but 67% of the AF[ib] episodes lasted for more than 1 hour, showing that this is not trivial AF[ib]. This is meaningful AF[ib],” he said.

Dr. Schwamm said the major question is whether these cases of AFib that are detected with a device warrant treatment with anticoagulation. He noted that, in this study, clinicians decided to provide anticoagulation to 70%-80% of patients in whom AFib was detected.

“If we think it deserves treatment, then we have to look for it. And if we care about finding AF[ib], we have no choice but to monitor continuously,” he said.

“If this data doesn’t convince you that AF[ib] is present in this population, I don’t think any data will. Because it is consistent, it accumulates over time and looks remarkably similar to a set of data that we have all become very comfortable with – the CRYSTAL-AF study in patients with cryptogenic stroke,” he stated.

Dr. Schwamm noted that the STROKE AF trial was not based on the cause of the index stroke; rather, it was asking whether there are risk factors that could contribute to the 25% stroke recurrence rate in this population that are not covered in current guidelines.

“I’m really trying to move away from the anchor that I was trained in, which is to figure out the cause of the last stroke to help decide how to prevent the next stroke, towards more of a probabilistic model – of what is all the information I have at my disposal and how do I act on it to prevent the next stroke? We have to start thinking differently about building models for future stroke risk and determining therapy based on that,” he commented.
 

Changing practice

ISC 2023 program chair Tudor Jovin, MD, Cooper Neurological Institute, Cherry Hill, N.J., and moderator of the session at which the results were presented, discussed the STROKE AF results in a highlights presentation.

“To me as clinician, these results are even more relevant than those at 12 months,” Dr. Jovin said. “The lesson I took is that AF[ib] is even more prevalent than we thought. The burden of AF[ib] is significant in these patients, and it doesn’t seem to be limited to a particular time. These are very thought-provoking results which are going to change clinical practice. I think the threshold for long-term monitoring will be lower.”

Comoderator Lauren Sansing, MD, Yale University, New Haven, Conn., added: “This study shows that the longer we monitor, the more patients with AF[ib] we are likely to pick up. And because in two-thirds of patients with AF[ib], it lasted longer than 1 hour, I do believe this was clinically relevant AF[ib]. The question now is, do we monitor everyone? I think it puts the burden on us to search for AF[ib] in our patients.”

In his presentation, Dr. Schwamm explained that, on the basis of the CRYSTAL-AF study, insertable cardiac monitoring devices are frequently used to identify poststroke AFib in patients with cryptogenic stroke. In the device-monitored arm of that study, AFib was detected in 12.4% of patients over 12 months versus 2.0% in the control arm.

“However, we don’t know how often AF[ib] is detected in other presumed stroke types – largely those due to atherosclerosis,” he said.

He pointed out that, at present, long-term monitoring post stroke for the detection of AFib is not currently recommended for patients with ischemic stroke, owing to presumed small-vessel occlusion or large-artery atherosclerosis.

“In these patients, we are not suspecting AF[ib] because we believe the cause of the stroke was not embolic. But we wanted to investigate what the AF[ib] risk is in these patients, who often have multiple stroke risk factors,” he said.

The trial enrolled 496 patients at 33 centers in the United States. Eligible patients were aged 60 years or older or aged 50-59 years with at least one additional stroke risk factor and had an index stroke that was attributed to large-artery or small-vessel disease. Patients were randomly assigned either to continuous monitoring with the Reveal LINQ device (Medtronic) or to the control arm following site-specific standard of care for AFib detection.

Dr. Schwamm noted that usual care for these patients normally involves monitoring for just a few days while in hospital, but this picks up less than 5% of AFib occurrences.

Baseline characteristics of patients in the STROKE AF study showed that the enrolled population was at high risk for stroke, with a CHADSVASC score of 5. But the index strokes were generally small; the median National Institutes of Health Stroke Scale score was 2.

Results at 12 months, reported 2 years ago, showed a 12.5% incidence of AFib with continuous monitoring versus 1.8% with standard of care (hazard ratio, 7.7; P < .001), rates similar to that found in the CRYSTAL-AF study.

By 3 years, the rate of detected AFib had risen to 21.7% in the continuous monitoring arm versus 2.4% in the control arm (HR, 10.0; P < .001).

“At 12 months, we were seven times more likely to detect AF[ib] with continuous monitoring in these patients, and by 3 years, it was 10 times more likely that AF would be detected with continuous monitoring. I think we’ve settled the question of the best way to find AF[ib] in these patients – it is with an inserted device,” Dr. Schwamm said.

“We have also shown that this is not a transient rise in AFib after the stroke which then diminishes over the next few years. It is a continuous and progressive detection of AF[ib].”

Dr. Schwamm pointed out that 88% of the recorded AFib episodes were asymptomatic. “So relying on patients self-reporting symptoms when deciding who to monitor is unreliable and not a sensible strategy.”

The median time to the first adjudicated AFib episode at 12-month follow-up was 99 days; at the 3-year follow-up, it was 284 days.

“This shows that 30 days of monitoring with an external patch is not sufficient to exclude the presence of AF[ib]. And this really argues for a strategy of immediate insertion of cardiac monitor placement if your goal is to look for AF[ib],” Dr. Schwamm commented.
 

Is this clinically relevant AFib?

Dr. Schwamm acknowledged that there is a question of whether device-detected AFib should be thought about in the same way as clinically detected AFib with respect to future stroke risk.

He noted that, in this study, 67.4% of patients for whom AFib was detected by continuous monitoring (31 of 46 patients) had at least one episode of AFib that lasted more than 1 hour.

“This is not a trivial little squiggle of something on an EKG which then goes away. This is of significant duration that the cardiologist who adjudicated these rhythm strips felt confident was AF[ib].”

He added: “AF[ib] lasting more than 1 hour crosses the threshold for most practitioners I know to feel confident in treating the patient with anticoagulation. If it was symptomatic AF, this wouldn’t even be a question.”

Dr. Schwamm made the point that device-detected A AFib F has been accepted as worthy of treatment in patients after cryptogenic stroke.

“If we are honest with ourselves and if we have no hesitation in starting anticoagulation in a patient with cryptogenic stroke who has had device-detected AF 6 months later, should we decide that if the patient has had a lacunar stroke, we can ignore that same device-detected fibrillation?”

He put forward the idea that, at some level, all stroke is cryptogenic. “We never know for sure what the cause was. We have hypotheses, we have associations, but we don’t really know. So how much should we weigh that presumptive etiology in terms of how we interpret a rhythm disturbance of fibrillation?”

When looking for predictors of AFib in this study, the investigators found that patients were more likely to have an episode of AFib detected if they had one of the four following risk factors: congestive heart failure, left atrial enlargement, obesity, or QRS prolongation.

“In patients with any one of those four factors, 30% of those had device-detected AF[ib]. These are same predictors of AF[ib] that we are all accustomed to,” Dr. Schwamm said.
 

Shared decision-making

Dr. Schwamm said in an interview that, in his practice, for these patients, the decision as to whether to use continuous monitoring is made with the patient through shared decision-making.

“We discuss the chance that they could have AF[ib], and I suggest that it might be worth looking for it, but there are factors to be considered. There is a cost to the device, and reimbursement may depend on insurance coverage. Also, some patients may have strong feelings about having the chip implanted in their body.”

He says implanting the chip is easy. “It takes longer to check in at the front desk than to put the device in. It is injected under the skin. It just needs two stitches and a Band-Aid.” The device connects with a smartphone, and the results are interpreted by a cardiologist.

Dr. Schwamm pointed out that the optimal antithrombotic regimen for these patients in whom AFib is detected remains uncertain and should be the focus of future research.

“Do we just stick to antiplatelet therapy or advance to anticoagulation? In moving to an anticoagulant, are we providing less effective prevention for the atherosclerotic stroke risk at the expense of reducing the AF[ib]-related stroke risk? That may be a reasonable trade-off because we know the disability from AF[ib]-associated stroke is much higher.

“Or perhaps the optimal therapy is aspirin plus low-dose anticoagulant? Or left atrial appendage closure and an antiplatelet for patients at a higher risk of bleeding?” he said. “These are the really important questions we need to start asking.”

He added that he hopes a future study will address these questions, but he noted that it would have to be a large study, that it would have to first identify these patients and then randomly assign them to anticoagulation or to no treatment. “That is quite a major undertaking.”

In the highlights presentation, Dr. Jovin said he was uncertain of which of these patients in whom AFib is detected would benefit from anticoagulation. He said he would also like to see a randomized trial on this. But he added: “This would be challenging, as there is the issue of whether there would be equipoise to allow us to randomize to a placebo.”

Dr. Sansing agreed. “I think it would be a hard sell. I would have to think carefully about randomizing a patient to anticoagulation therapy or no therapy who has been found to have AF[ib].”

Dr. Schwamm noted that the current STROKE-AF study was not designed or powered to detect differences in stroke recurrence rates and that there was no difference in stroke recurrence rates between the two arms. There was also no randomization with regard to treatment; choice of medication was left to the discretion of the treating physician.

But he noted that only for 3 of the 34 patients with recurrent stroke in the continuous-monitor arm was AFib detected prior to the recurrent stroke, and only one of those three was receiving anticoagulation at the time of the recurrent stroke.

“These strokes were occurring in patients who did not have device-detected AF[ib],” Dr. Schwamm said. “This is because the population in this study were loaded with stroke risk factors and are at risk of recurrent stroke, but we don’t have the opportunity in this study to really understand the significance of the recurrent strokes.”

The STROKE AF trial was funded by Medtronic. Dr. Schwamm is a consultant to Medtronic.

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

Lipoprotein(a) [Lp(a)] was first identified in 1963, just about the time that my 16-year-old arteries were probably developing fatty streaks. It soon became clear that Lp(a) was associated with atherosclerotic cardiovascular disease (ASCVD), but whether an elevated blood level was a biomarker or a causal factor proved difficult to determine. Studies of inheritance patterns confirmed that blood levels were primarily genetically determined and largely resistant to lifestyle and pharmacologic intervention. It seemed senseless to test for something that was deemed “unmodifiable,” so untreatable. That label stuck for decades.

Fortunately, a resurgent interest in molecular pathophysiology this past decade has clarified Lp(a)’s unique contribution to atherothrombotic disease and calcific aortic stenosis. While there remains much to be learned about this complex, highly atherogenic molecule and its role in cardiac disease, it seems shortsighted not to take the simple step of identifying who carries this risk. Why are we not testing everyone for an extremely common and potent risk factor for the most lethal disease on the planet?

Epidemiologic studies project a stunning number of people in the United States to be at increased risk for Lp(a)-mediated coronary and cerebrovascular events. Because the LPA gene which codes for the apo(a) component of the Lp(a) molecule is fully expressed at age 2, this is a truly lifelong risk factor for a projected 64 million individuals with blood levels (> 60 mg/dL) high enough to double their risk for ASCVD. Because risk increases linearly, this includes 16 million, like me, with levels > 116 mg/dL, who are at four times the risk for ASCVD as those with normal levels (< 30 mg/dL).

Because Lp(a) level remains relatively constant throughout life, a single blood test would help stratify the risk it confers on millions of people who, under current U.S. guidelines, would never be tested. Until Lp(a) is integrated into its algorithms, the commonly used ASCVD Risk Calculator will substantially underestimate risk in 20% of the population.

A potential barrier to universal testing is that the ideal method to measure Lp(a) has yet to be determined. Lp(a) comprises an apoB particle bonded to an apo(a) particle. Apo(a) is complex and has a number of isoforms that can result in large heterogeneity in apo(a) size between, as well as within, individuals. This contributes to controversy about the ideal assay and whether Lp(a) levels should be expressed as mass (mg/dL) or number of particles (nmols/L). This should not, however, deter universal testing.
 

One-time cost, lifetime benefit?

Absent universal testing, it’s impossible to estimate the economic toll that Lp(a) exacts, but it’s surely an extraordinary number, particularly because the highest-risk individuals are prone to recurrent, nonfatal vascular events. The substantial price tag for my personal decade of Lp(a)-induced vascular havoc included four percutaneous coronary interventions with rapid stent restenosis, an eventual bypass surgery, and an aborted left hemispheric stroke, requiring an urgent carotid endarterectomy.

As a frame of reference, U.S. expenditures related to ASCVD are estimated to be $351 billion annually. If everyone in the United States over the age of 18 were tested for Lp(a) at a cost of $100 per person, this would be a $21 billion expenditure. This nonrecurring expense would identify the 20% – or almost 42 million individuals – at high risk for ASCVD, a number of whom would have already had vascular events. This one-time cost would be a foundational step in securing year-after-year savings from enhanced ASCVD prevention and reduction in recurrent vascular events.

Such savings would be significantly enhanced if and when targeted, effective Lp(a) treatments become available, but it seems shortsighted to make this the linchpin for universal testing. It’s noteworthy that Canadian and European guidelines already endorse one-time testing for all.

The confirmation of Lp(a)’s causal role in ASCVD remains underappreciated by medical providers across all specialties. Much of the elegant Lp(a)-related science of the past decade has yet to translate to the clinical world. What better way to rectify this than by identifying those with high Lp(a)? Since the advent of the statin era, “good” and “bad” cholesterol values are common conversational fare, in part because virtually every adult has had not one, but many lipid panels. Universal Lp(a) testing would spotlight this pervasive and important risk factor that was referred to as the “horrible” cholesterol in a recent review.
 

U.S. guidelines need updating

To foster this, U.S. guidelines, which influence every aspect of care, including testing, prevention, treatment, reimbursement, and medical legal issues, need to be simplified. The discussion of Lp(a) testing in the 2018 U.S. guidelines on cholesterol management is already obsolete. The contingencies on when testing is “reasonable” or “may be reasonable” are dated and cumbersome. In contrast, a recommendation to test everyone once, perhaps in adolescence, would be a useful, forward-looking strategy.

To date, trials of an antisense oligonucleotide and a small interfering RNA molecule targeting hepatic LPA messenger RNA have confirmed that plasma Lp(a) levels can be significantly and safely lowered. If the ongoing Lp(a) HORIZON and OCEAN(a) phase 3 trials have positive outcomes in patients with known ASCVD, this would spawn a host of clinical trials to explore the possibilities of these therapies in primary prevention as well. These will require tens of thousands of enrollees, and universal testing would expand the pool of potential participants.

The majority of at-risk individuals identified through universal testing would be candidates for primary prevention. This large, currently unidentified cohort should have all coexisting risk factors assessed and managed; lowering elevated LDL cholesterol early and aggressively is paramount. Recent data from the United Kingdom suggest that attainment of specific LDL cholesterol levels may offset the risk for vascular events in those with high Lp(a) levels.

Of note, this was the advice given to the small fraction of high-risk individuals like me, who had their Lp(a) level tested long before its ominous implications were understood. This recommendation was informed mostly by common sense. For any number of reasons, the same might be said for universal testing.

Dr. Leahy, a retired cardiologist in San Diego, has an abiding professional and personal interest in Lp(a), which has been responsible for a number of cardiovascular events in his own life over the past 2 decades. He was a participant in the phase 2 clinical trial of the Lp(a)-lowering antisense oligonucleotide being studied in the Lp(a) HORIZON trial, funded by Novartis, and is currently undergoing apheresis treatment. A version of this article originally appeared on Medscape.com.

Lipoprotein(a) [Lp(a)] was first identified in 1963, just about the time that my 16-year-old arteries were probably developing fatty streaks. It soon became clear that Lp(a) was associated with atherosclerotic cardiovascular disease (ASCVD), but whether an elevated blood level was a biomarker or a causal factor proved difficult to determine. Studies of inheritance patterns confirmed that blood levels were primarily genetically determined and largely resistant to lifestyle and pharmacologic intervention. It seemed senseless to test for something that was deemed “unmodifiable,” so untreatable. That label stuck for decades.

Fortunately, a resurgent interest in molecular pathophysiology this past decade has clarified Lp(a)’s unique contribution to atherothrombotic disease and calcific aortic stenosis. While there remains much to be learned about this complex, highly atherogenic molecule and its role in cardiac disease, it seems shortsighted not to take the simple step of identifying who carries this risk. Why are we not testing everyone for an extremely common and potent risk factor for the most lethal disease on the planet?

Epidemiologic studies project a stunning number of people in the United States to be at increased risk for Lp(a)-mediated coronary and cerebrovascular events. Because the LPA gene which codes for the apo(a) component of the Lp(a) molecule is fully expressed at age 2, this is a truly lifelong risk factor for a projected 64 million individuals with blood levels (> 60 mg/dL) high enough to double their risk for ASCVD. Because risk increases linearly, this includes 16 million, like me, with levels > 116 mg/dL, who are at four times the risk for ASCVD as those with normal levels (< 30 mg/dL).

Because Lp(a) level remains relatively constant throughout life, a single blood test would help stratify the risk it confers on millions of people who, under current U.S. guidelines, would never be tested. Until Lp(a) is integrated into its algorithms, the commonly used ASCVD Risk Calculator will substantially underestimate risk in 20% of the population.

A potential barrier to universal testing is that the ideal method to measure Lp(a) has yet to be determined. Lp(a) comprises an apoB particle bonded to an apo(a) particle. Apo(a) is complex and has a number of isoforms that can result in large heterogeneity in apo(a) size between, as well as within, individuals. This contributes to controversy about the ideal assay and whether Lp(a) levels should be expressed as mass (mg/dL) or number of particles (nmols/L). This should not, however, deter universal testing.
 

One-time cost, lifetime benefit?

Absent universal testing, it’s impossible to estimate the economic toll that Lp(a) exacts, but it’s surely an extraordinary number, particularly because the highest-risk individuals are prone to recurrent, nonfatal vascular events. The substantial price tag for my personal decade of Lp(a)-induced vascular havoc included four percutaneous coronary interventions with rapid stent restenosis, an eventual bypass surgery, and an aborted left hemispheric stroke, requiring an urgent carotid endarterectomy.

As a frame of reference, U.S. expenditures related to ASCVD are estimated to be $351 billion annually. If everyone in the United States over the age of 18 were tested for Lp(a) at a cost of $100 per person, this would be a $21 billion expenditure. This nonrecurring expense would identify the 20% – or almost 42 million individuals – at high risk for ASCVD, a number of whom would have already had vascular events. This one-time cost would be a foundational step in securing year-after-year savings from enhanced ASCVD prevention and reduction in recurrent vascular events.

Such savings would be significantly enhanced if and when targeted, effective Lp(a) treatments become available, but it seems shortsighted to make this the linchpin for universal testing. It’s noteworthy that Canadian and European guidelines already endorse one-time testing for all.

The confirmation of Lp(a)’s causal role in ASCVD remains underappreciated by medical providers across all specialties. Much of the elegant Lp(a)-related science of the past decade has yet to translate to the clinical world. What better way to rectify this than by identifying those with high Lp(a)? Since the advent of the statin era, “good” and “bad” cholesterol values are common conversational fare, in part because virtually every adult has had not one, but many lipid panels. Universal Lp(a) testing would spotlight this pervasive and important risk factor that was referred to as the “horrible” cholesterol in a recent review.
 

U.S. guidelines need updating

To foster this, U.S. guidelines, which influence every aspect of care, including testing, prevention, treatment, reimbursement, and medical legal issues, need to be simplified. The discussion of Lp(a) testing in the 2018 U.S. guidelines on cholesterol management is already obsolete. The contingencies on when testing is “reasonable” or “may be reasonable” are dated and cumbersome. In contrast, a recommendation to test everyone once, perhaps in adolescence, would be a useful, forward-looking strategy.

To date, trials of an antisense oligonucleotide and a small interfering RNA molecule targeting hepatic LPA messenger RNA have confirmed that plasma Lp(a) levels can be significantly and safely lowered. If the ongoing Lp(a) HORIZON and OCEAN(a) phase 3 trials have positive outcomes in patients with known ASCVD, this would spawn a host of clinical trials to explore the possibilities of these therapies in primary prevention as well. These will require tens of thousands of enrollees, and universal testing would expand the pool of potential participants.

The majority of at-risk individuals identified through universal testing would be candidates for primary prevention. This large, currently unidentified cohort should have all coexisting risk factors assessed and managed; lowering elevated LDL cholesterol early and aggressively is paramount. Recent data from the United Kingdom suggest that attainment of specific LDL cholesterol levels may offset the risk for vascular events in those with high Lp(a) levels.

Of note, this was the advice given to the small fraction of high-risk individuals like me, who had their Lp(a) level tested long before its ominous implications were understood. This recommendation was informed mostly by common sense. For any number of reasons, the same might be said for universal testing.

Dr. Leahy, a retired cardiologist in San Diego, has an abiding professional and personal interest in Lp(a), which has been responsible for a number of cardiovascular events in his own life over the past 2 decades. He was a participant in the phase 2 clinical trial of the Lp(a)-lowering antisense oligonucleotide being studied in the Lp(a) HORIZON trial, funded by Novartis, and is currently undergoing apheresis treatment. A version of this article originally appeared on Medscape.com.

Lipoprotein(a) [Lp(a)] was first identified in 1963, just about the time that my 16-year-old arteries were probably developing fatty streaks. It soon became clear that Lp(a) was associated with atherosclerotic cardiovascular disease (ASCVD), but whether an elevated blood level was a biomarker or a causal factor proved difficult to determine. Studies of inheritance patterns confirmed that blood levels were primarily genetically determined and largely resistant to lifestyle and pharmacologic intervention. It seemed senseless to test for something that was deemed “unmodifiable,” so untreatable. That label stuck for decades.

Fortunately, a resurgent interest in molecular pathophysiology this past decade has clarified Lp(a)’s unique contribution to atherothrombotic disease and calcific aortic stenosis. While there remains much to be learned about this complex, highly atherogenic molecule and its role in cardiac disease, it seems shortsighted not to take the simple step of identifying who carries this risk. Why are we not testing everyone for an extremely common and potent risk factor for the most lethal disease on the planet?

Epidemiologic studies project a stunning number of people in the United States to be at increased risk for Lp(a)-mediated coronary and cerebrovascular events. Because the LPA gene which codes for the apo(a) component of the Lp(a) molecule is fully expressed at age 2, this is a truly lifelong risk factor for a projected 64 million individuals with blood levels (> 60 mg/dL) high enough to double their risk for ASCVD. Because risk increases linearly, this includes 16 million, like me, with levels > 116 mg/dL, who are at four times the risk for ASCVD as those with normal levels (< 30 mg/dL).

Because Lp(a) level remains relatively constant throughout life, a single blood test would help stratify the risk it confers on millions of people who, under current U.S. guidelines, would never be tested. Until Lp(a) is integrated into its algorithms, the commonly used ASCVD Risk Calculator will substantially underestimate risk in 20% of the population.

A potential barrier to universal testing is that the ideal method to measure Lp(a) has yet to be determined. Lp(a) comprises an apoB particle bonded to an apo(a) particle. Apo(a) is complex and has a number of isoforms that can result in large heterogeneity in apo(a) size between, as well as within, individuals. This contributes to controversy about the ideal assay and whether Lp(a) levels should be expressed as mass (mg/dL) or number of particles (nmols/L). This should not, however, deter universal testing.
 

One-time cost, lifetime benefit?

Absent universal testing, it’s impossible to estimate the economic toll that Lp(a) exacts, but it’s surely an extraordinary number, particularly because the highest-risk individuals are prone to recurrent, nonfatal vascular events. The substantial price tag for my personal decade of Lp(a)-induced vascular havoc included four percutaneous coronary interventions with rapid stent restenosis, an eventual bypass surgery, and an aborted left hemispheric stroke, requiring an urgent carotid endarterectomy.

As a frame of reference, U.S. expenditures related to ASCVD are estimated to be $351 billion annually. If everyone in the United States over the age of 18 were tested for Lp(a) at a cost of $100 per person, this would be a $21 billion expenditure. This nonrecurring expense would identify the 20% – or almost 42 million individuals – at high risk for ASCVD, a number of whom would have already had vascular events. This one-time cost would be a foundational step in securing year-after-year savings from enhanced ASCVD prevention and reduction in recurrent vascular events.

Such savings would be significantly enhanced if and when targeted, effective Lp(a) treatments become available, but it seems shortsighted to make this the linchpin for universal testing. It’s noteworthy that Canadian and European guidelines already endorse one-time testing for all.

The confirmation of Lp(a)’s causal role in ASCVD remains underappreciated by medical providers across all specialties. Much of the elegant Lp(a)-related science of the past decade has yet to translate to the clinical world. What better way to rectify this than by identifying those with high Lp(a)? Since the advent of the statin era, “good” and “bad” cholesterol values are common conversational fare, in part because virtually every adult has had not one, but many lipid panels. Universal Lp(a) testing would spotlight this pervasive and important risk factor that was referred to as the “horrible” cholesterol in a recent review.
 

U.S. guidelines need updating

To foster this, U.S. guidelines, which influence every aspect of care, including testing, prevention, treatment, reimbursement, and medical legal issues, need to be simplified. The discussion of Lp(a) testing in the 2018 U.S. guidelines on cholesterol management is already obsolete. The contingencies on when testing is “reasonable” or “may be reasonable” are dated and cumbersome. In contrast, a recommendation to test everyone once, perhaps in adolescence, would be a useful, forward-looking strategy.

To date, trials of an antisense oligonucleotide and a small interfering RNA molecule targeting hepatic LPA messenger RNA have confirmed that plasma Lp(a) levels can be significantly and safely lowered. If the ongoing Lp(a) HORIZON and OCEAN(a) phase 3 trials have positive outcomes in patients with known ASCVD, this would spawn a host of clinical trials to explore the possibilities of these therapies in primary prevention as well. These will require tens of thousands of enrollees, and universal testing would expand the pool of potential participants.

The majority of at-risk individuals identified through universal testing would be candidates for primary prevention. This large, currently unidentified cohort should have all coexisting risk factors assessed and managed; lowering elevated LDL cholesterol early and aggressively is paramount. Recent data from the United Kingdom suggest that attainment of specific LDL cholesterol levels may offset the risk for vascular events in those with high Lp(a) levels.

Of note, this was the advice given to the small fraction of high-risk individuals like me, who had their Lp(a) level tested long before its ominous implications were understood. This recommendation was informed mostly by common sense. For any number of reasons, the same might be said for universal testing.

Dr. Leahy, a retired cardiologist in San Diego, has an abiding professional and personal interest in Lp(a), which has been responsible for a number of cardiovascular events in his own life over the past 2 decades. He was a participant in the phase 2 clinical trial of the Lp(a)-lowering antisense oligonucleotide being studied in the Lp(a) HORIZON trial, funded by Novartis, and is currently undergoing apheresis treatment. A version of this article originally appeared on Medscape.com.

Replacing dual-antiplatelet therapy (DAPT) with clopidogrel alone 1 month after percutaneous intervention (PCI) offers a lower risk of bleeding with comparable protection against cardiovascular events, according to two subgroup analyses of the Japanese STOPDAPT-2 and STOPDAPT-2 ACS trials.

The objective of these two analyses was to evaluate whether there was a benefit-to-risk ratio advantage for those who entered the study with high bleeding risk or who had undergone a complex PCI. Overall, bleeding risk was reduced without a major increase in cardiovascular events regardless of subgroup, according to results published by a multicenter group of Japanese investigators.

In this substudy, like the previously published studies from which the data were drawn, the primary endpoint was a composite of cardiovascular death, myocardial infarction, definite stent thrombosis, stroke, and Thrombolysis In Myocardial Infarction bleeding (major or minor).

The proportion of patients in the 1-month and 12-month DAPT groups reaching this composite endpoint at 1 year was not significantly different among patients stratified by baseline bleeding risk or by PCI complexity, according to a multicenter group of authors led by Takeshi Kimura, MD, department of cardiovascular medicine, Kyoto University.
 

Shortened DAPT is focus of multiple trials

The new analysis, published in JACC Asia, is a follow-up to the 2019 STOPDAPT-2 trial, published in JAMA, and the 2022 STOPDAPT-2 ACS trial, published in JAMA Cardiology. The first tested 1- versus 12-month DAPT in PCI patients receiving a drug-eluting stent. The second study compared the same strategies in patients undergoing PCI to treat an acute coronary syndrome (ACS).

Both studies were conducted in Japan. DAPT consisted of the P2Y12 receptor inhibitor clopidogrel plus aspirin. The experimental arm received this regimen for 1 month followed by clopidogrel monotherapy. The control arm remained on DAPT for 12 months.

The study is potentially important because it addresses the challenge of finding “the sweet spot of antiplatelet therapy in East Asian patients,” according to the coauthors of an accompanying editorial in the same issue of JACC Asia.

Previous data suggest East Asians have a higher risk of bleeding but lower anti-ischemic benefits from DAPT therapy, explained the coauthors, Antonio Greco, MD and Davide Capodanno, MD, PhD, both from the University of Catania (Italy). They praised the effort to explore this question.

In the STOPDAPT-2 trial, the shortened DAPT regimen was associated with a significantly lower rate of a composite endpoint of cardiovascular and bleeding events than standard DAPT, meeting criteria for superiority as well as noninferiority. In the STOPDAPT-2 ACS trial, shortened DAPT failed to achieve noninferiority to standard DAPT because of an increase in cardiovascular events despite a reduction in bleeding events.

Neither of these studies specifically compared shortened to standard DAPT in patients with high bleeding risk or in patients who underwent complex PCI, which are among the most common patient groups in which to consider a modified DAPT regimen. To do this, two new substudies were performed with the combined data from 5,997 patients in the two STOPDAPT-2 trials.
 

Two candidate groups for shortened DAPT evaluated

In the first substudy, the 1,893 patients who met criteria for high bleeding risk were compared with the 4,104 who did not. In those with a high risk of bleeding, the proportion reaching a primary endpoint at 1 year was lower, but not significantly different, for those on 1-month versus standard DAPT (5.01% vs. 5.14%). This was also true in those without an elevated bleeding risk (1.90% vs. 2.02%).

In the second substudy, 999 patients who had a complex PCI, defined by such characteristics as implantation of at least three stents or chronic total occlusion in the target lesions, were compared with the 4,998 who did not. Again, the primary endpoint was lower in both those who had a complex PCI (3.15% vs. 4.07%) and those who did not (2.78% vs. 2.82%).

Not surprisingly, patients with a high bleeding risk benefited from a substantially lower risk of bleeding events on the 1-month DAPT regimen (0.66% vs. 2.27%). The cost was a higher risk of cardiovascular events (4.35% vs. 3.52%), but this difference did not reach significance. Those without an elevated bleeding risk also had a lower risk of bleeding events (0.43% vs. 0.85%) but a higher risk of cardiovascular events (1.56% vs. 1.22%). Again, differences were nonsignificant. In the substudy evaluating DAPT duration in relation to complex PCI, the rate of cardiovascular events at 1 year in those treated with short versus 12-month DAPT was nearly identical (2.53% vs. 2.52%). In the non–complex PCI patients, event rates were nonsignificantly greater on the shortened DAPT regimen (2.38% vs. 1.86%), but the bleeding rate was lower on shortened DAPT whether PCI had been complex (0.63% vs. 1.75%) or not (0.48% vs. 1.22%).

In the absence of any major signal that complex PCI benefited from longer duration DAPT, “complex PCI might not be an appropriate determinant for DAPT durations,” according to Dr. Kimura and coinvestigators.
 

Study data might not be generalizable

Dr. Greco and Dr. Capodanno pointed out that there are differences between patients and PCI practices in Japan relative to other areas of the world, limiting the generalizability of these findings even if the question is relevant.

“This is an approach that might be suggested for patients at high bleeding risk who have the characteristics of the patients enrolled in the STOPDAPT-2 trials,” Dr. Capodanno said in an interview. In his own PCI practice treating ACS patients, “I would not feel safe enough with clopidogrel monotherapy after only 1 month.”

He considers the ACS population to have a particularly “delicate bleeding-ischemia trade-off,” which is why he thinks this question is relevant and needs to be explored further in additional populations. However, he might design trials differently in his own practice setting. For example, he would at the very least be interested in testing a more potent P2Y12 inhibitor such as ticagrelor when considering a single antiplatelet agent after a limited course of DAPT.

One message from this study is that “bleeding risk trumps PCI complexity,” according to Deepak L. Bhatt, MD, who recently assumed the position of director of Mount Sinai Heart in New York. He liked the approach the investigators took to address a complex and relevant clinical issue, but he also expressed reservations about the clinical applicability of this subgroup analysis.

“We really need more data before uniformly shortening DAPT duration in all patients,” Dr. Bhatt said in an interview. He considers this a hot clinical issue that is likely to generate more trials. He hopes these will provide more definitive evidence of when and how DAPT duration can be reduced. Overall, he anticipates progress toward tailoring therapy in specific populations in order to achieve the best risk-to-benefit balance.

Dr. Kimura has financial relationships with Boston Scientific, Daiichi Sankyo, Sanofi, Terumo, and Abbott Medical Japan, which provided funding for the STOPDAPT-2 and STOPDAPT-2 ACS trials. Dr. Capodanno reported financial relationships with Amgen, Arena, Chiesi, Daiichi Sakyo, Sanofi Aventis, and Terumo. Dr. Bhatt reported financial relationships with more than 20 pharmaceutical companies, including Abbott Medical.

Replacing dual-antiplatelet therapy (DAPT) with clopidogrel alone 1 month after percutaneous intervention (PCI) offers a lower risk of bleeding with comparable protection against cardiovascular events, according to two subgroup analyses of the Japanese STOPDAPT-2 and STOPDAPT-2 ACS trials.

The objective of these two analyses was to evaluate whether there was a benefit-to-risk ratio advantage for those who entered the study with high bleeding risk or who had undergone a complex PCI. Overall, bleeding risk was reduced without a major increase in cardiovascular events regardless of subgroup, according to results published by a multicenter group of Japanese investigators.

In this substudy, like the previously published studies from which the data were drawn, the primary endpoint was a composite of cardiovascular death, myocardial infarction, definite stent thrombosis, stroke, and Thrombolysis In Myocardial Infarction bleeding (major or minor).

The proportion of patients in the 1-month and 12-month DAPT groups reaching this composite endpoint at 1 year was not significantly different among patients stratified by baseline bleeding risk or by PCI complexity, according to a multicenter group of authors led by Takeshi Kimura, MD, department of cardiovascular medicine, Kyoto University.
 

Shortened DAPT is focus of multiple trials

The new analysis, published in JACC Asia, is a follow-up to the 2019 STOPDAPT-2 trial, published in JAMA, and the 2022 STOPDAPT-2 ACS trial, published in JAMA Cardiology. The first tested 1- versus 12-month DAPT in PCI patients receiving a drug-eluting stent. The second study compared the same strategies in patients undergoing PCI to treat an acute coronary syndrome (ACS).

Both studies were conducted in Japan. DAPT consisted of the P2Y12 receptor inhibitor clopidogrel plus aspirin. The experimental arm received this regimen for 1 month followed by clopidogrel monotherapy. The control arm remained on DAPT for 12 months.

The study is potentially important because it addresses the challenge of finding “the sweet spot of antiplatelet therapy in East Asian patients,” according to the coauthors of an accompanying editorial in the same issue of JACC Asia.

Previous data suggest East Asians have a higher risk of bleeding but lower anti-ischemic benefits from DAPT therapy, explained the coauthors, Antonio Greco, MD and Davide Capodanno, MD, PhD, both from the University of Catania (Italy). They praised the effort to explore this question.

In the STOPDAPT-2 trial, the shortened DAPT regimen was associated with a significantly lower rate of a composite endpoint of cardiovascular and bleeding events than standard DAPT, meeting criteria for superiority as well as noninferiority. In the STOPDAPT-2 ACS trial, shortened DAPT failed to achieve noninferiority to standard DAPT because of an increase in cardiovascular events despite a reduction in bleeding events.

Neither of these studies specifically compared shortened to standard DAPT in patients with high bleeding risk or in patients who underwent complex PCI, which are among the most common patient groups in which to consider a modified DAPT regimen. To do this, two new substudies were performed with the combined data from 5,997 patients in the two STOPDAPT-2 trials.
 

Two candidate groups for shortened DAPT evaluated

In the first substudy, the 1,893 patients who met criteria for high bleeding risk were compared with the 4,104 who did not. In those with a high risk of bleeding, the proportion reaching a primary endpoint at 1 year was lower, but not significantly different, for those on 1-month versus standard DAPT (5.01% vs. 5.14%). This was also true in those without an elevated bleeding risk (1.90% vs. 2.02%).

In the second substudy, 999 patients who had a complex PCI, defined by such characteristics as implantation of at least three stents or chronic total occlusion in the target lesions, were compared with the 4,998 who did not. Again, the primary endpoint was lower in both those who had a complex PCI (3.15% vs. 4.07%) and those who did not (2.78% vs. 2.82%).

Not surprisingly, patients with a high bleeding risk benefited from a substantially lower risk of bleeding events on the 1-month DAPT regimen (0.66% vs. 2.27%). The cost was a higher risk of cardiovascular events (4.35% vs. 3.52%), but this difference did not reach significance. Those without an elevated bleeding risk also had a lower risk of bleeding events (0.43% vs. 0.85%) but a higher risk of cardiovascular events (1.56% vs. 1.22%). Again, differences were nonsignificant. In the substudy evaluating DAPT duration in relation to complex PCI, the rate of cardiovascular events at 1 year in those treated with short versus 12-month DAPT was nearly identical (2.53% vs. 2.52%). In the non–complex PCI patients, event rates were nonsignificantly greater on the shortened DAPT regimen (2.38% vs. 1.86%), but the bleeding rate was lower on shortened DAPT whether PCI had been complex (0.63% vs. 1.75%) or not (0.48% vs. 1.22%).

In the absence of any major signal that complex PCI benefited from longer duration DAPT, “complex PCI might not be an appropriate determinant for DAPT durations,” according to Dr. Kimura and coinvestigators.
 

Study data might not be generalizable

Dr. Greco and Dr. Capodanno pointed out that there are differences between patients and PCI practices in Japan relative to other areas of the world, limiting the generalizability of these findings even if the question is relevant.

“This is an approach that might be suggested for patients at high bleeding risk who have the characteristics of the patients enrolled in the STOPDAPT-2 trials,” Dr. Capodanno said in an interview. In his own PCI practice treating ACS patients, “I would not feel safe enough with clopidogrel monotherapy after only 1 month.”

He considers the ACS population to have a particularly “delicate bleeding-ischemia trade-off,” which is why he thinks this question is relevant and needs to be explored further in additional populations. However, he might design trials differently in his own practice setting. For example, he would at the very least be interested in testing a more potent P2Y12 inhibitor such as ticagrelor when considering a single antiplatelet agent after a limited course of DAPT.

One message from this study is that “bleeding risk trumps PCI complexity,” according to Deepak L. Bhatt, MD, who recently assumed the position of director of Mount Sinai Heart in New York. He liked the approach the investigators took to address a complex and relevant clinical issue, but he also expressed reservations about the clinical applicability of this subgroup analysis.

“We really need more data before uniformly shortening DAPT duration in all patients,” Dr. Bhatt said in an interview. He considers this a hot clinical issue that is likely to generate more trials. He hopes these will provide more definitive evidence of when and how DAPT duration can be reduced. Overall, he anticipates progress toward tailoring therapy in specific populations in order to achieve the best risk-to-benefit balance.

Dr. Kimura has financial relationships with Boston Scientific, Daiichi Sankyo, Sanofi, Terumo, and Abbott Medical Japan, which provided funding for the STOPDAPT-2 and STOPDAPT-2 ACS trials. Dr. Capodanno reported financial relationships with Amgen, Arena, Chiesi, Daiichi Sakyo, Sanofi Aventis, and Terumo. Dr. Bhatt reported financial relationships with more than 20 pharmaceutical companies, including Abbott Medical.

Replacing dual-antiplatelet therapy (DAPT) with clopidogrel alone 1 month after percutaneous intervention (PCI) offers a lower risk of bleeding with comparable protection against cardiovascular events, according to two subgroup analyses of the Japanese STOPDAPT-2 and STOPDAPT-2 ACS trials.

The objective of these two analyses was to evaluate whether there was a benefit-to-risk ratio advantage for those who entered the study with high bleeding risk or who had undergone a complex PCI. Overall, bleeding risk was reduced without a major increase in cardiovascular events regardless of subgroup, according to results published by a multicenter group of Japanese investigators.

In this substudy, like the previously published studies from which the data were drawn, the primary endpoint was a composite of cardiovascular death, myocardial infarction, definite stent thrombosis, stroke, and Thrombolysis In Myocardial Infarction bleeding (major or minor).

The proportion of patients in the 1-month and 12-month DAPT groups reaching this composite endpoint at 1 year was not significantly different among patients stratified by baseline bleeding risk or by PCI complexity, according to a multicenter group of authors led by Takeshi Kimura, MD, department of cardiovascular medicine, Kyoto University.
 

Shortened DAPT is focus of multiple trials

The new analysis, published in JACC Asia, is a follow-up to the 2019 STOPDAPT-2 trial, published in JAMA, and the 2022 STOPDAPT-2 ACS trial, published in JAMA Cardiology. The first tested 1- versus 12-month DAPT in PCI patients receiving a drug-eluting stent. The second study compared the same strategies in patients undergoing PCI to treat an acute coronary syndrome (ACS).

Both studies were conducted in Japan. DAPT consisted of the P2Y12 receptor inhibitor clopidogrel plus aspirin. The experimental arm received this regimen for 1 month followed by clopidogrel monotherapy. The control arm remained on DAPT for 12 months.

The study is potentially important because it addresses the challenge of finding “the sweet spot of antiplatelet therapy in East Asian patients,” according to the coauthors of an accompanying editorial in the same issue of JACC Asia.

Previous data suggest East Asians have a higher risk of bleeding but lower anti-ischemic benefits from DAPT therapy, explained the coauthors, Antonio Greco, MD and Davide Capodanno, MD, PhD, both from the University of Catania (Italy). They praised the effort to explore this question.

In the STOPDAPT-2 trial, the shortened DAPT regimen was associated with a significantly lower rate of a composite endpoint of cardiovascular and bleeding events than standard DAPT, meeting criteria for superiority as well as noninferiority. In the STOPDAPT-2 ACS trial, shortened DAPT failed to achieve noninferiority to standard DAPT because of an increase in cardiovascular events despite a reduction in bleeding events.

Neither of these studies specifically compared shortened to standard DAPT in patients with high bleeding risk or in patients who underwent complex PCI, which are among the most common patient groups in which to consider a modified DAPT regimen. To do this, two new substudies were performed with the combined data from 5,997 patients in the two STOPDAPT-2 trials.
 

Two candidate groups for shortened DAPT evaluated

In the first substudy, the 1,893 patients who met criteria for high bleeding risk were compared with the 4,104 who did not. In those with a high risk of bleeding, the proportion reaching a primary endpoint at 1 year was lower, but not significantly different, for those on 1-month versus standard DAPT (5.01% vs. 5.14%). This was also true in those without an elevated bleeding risk (1.90% vs. 2.02%).

In the second substudy, 999 patients who had a complex PCI, defined by such characteristics as implantation of at least three stents or chronic total occlusion in the target lesions, were compared with the 4,998 who did not. Again, the primary endpoint was lower in both those who had a complex PCI (3.15% vs. 4.07%) and those who did not (2.78% vs. 2.82%).

Not surprisingly, patients with a high bleeding risk benefited from a substantially lower risk of bleeding events on the 1-month DAPT regimen (0.66% vs. 2.27%). The cost was a higher risk of cardiovascular events (4.35% vs. 3.52%), but this difference did not reach significance. Those without an elevated bleeding risk also had a lower risk of bleeding events (0.43% vs. 0.85%) but a higher risk of cardiovascular events (1.56% vs. 1.22%). Again, differences were nonsignificant. In the substudy evaluating DAPT duration in relation to complex PCI, the rate of cardiovascular events at 1 year in those treated with short versus 12-month DAPT was nearly identical (2.53% vs. 2.52%). In the non–complex PCI patients, event rates were nonsignificantly greater on the shortened DAPT regimen (2.38% vs. 1.86%), but the bleeding rate was lower on shortened DAPT whether PCI had been complex (0.63% vs. 1.75%) or not (0.48% vs. 1.22%).

In the absence of any major signal that complex PCI benefited from longer duration DAPT, “complex PCI might not be an appropriate determinant for DAPT durations,” according to Dr. Kimura and coinvestigators.
 

Study data might not be generalizable

Dr. Greco and Dr. Capodanno pointed out that there are differences between patients and PCI practices in Japan relative to other areas of the world, limiting the generalizability of these findings even if the question is relevant.

“This is an approach that might be suggested for patients at high bleeding risk who have the characteristics of the patients enrolled in the STOPDAPT-2 trials,” Dr. Capodanno said in an interview. In his own PCI practice treating ACS patients, “I would not feel safe enough with clopidogrel monotherapy after only 1 month.”

He considers the ACS population to have a particularly “delicate bleeding-ischemia trade-off,” which is why he thinks this question is relevant and needs to be explored further in additional populations. However, he might design trials differently in his own practice setting. For example, he would at the very least be interested in testing a more potent P2Y12 inhibitor such as ticagrelor when considering a single antiplatelet agent after a limited course of DAPT.

One message from this study is that “bleeding risk trumps PCI complexity,” according to Deepak L. Bhatt, MD, who recently assumed the position of director of Mount Sinai Heart in New York. He liked the approach the investigators took to address a complex and relevant clinical issue, but he also expressed reservations about the clinical applicability of this subgroup analysis.

“We really need more data before uniformly shortening DAPT duration in all patients,” Dr. Bhatt said in an interview. He considers this a hot clinical issue that is likely to generate more trials. He hopes these will provide more definitive evidence of when and how DAPT duration can be reduced. Overall, he anticipates progress toward tailoring therapy in specific populations in order to achieve the best risk-to-benefit balance.

Dr. Kimura has financial relationships with Boston Scientific, Daiichi Sankyo, Sanofi, Terumo, and Abbott Medical Japan, which provided funding for the STOPDAPT-2 and STOPDAPT-2 ACS trials. Dr. Capodanno reported financial relationships with Amgen, Arena, Chiesi, Daiichi Sakyo, Sanofi Aventis, and Terumo. Dr. Bhatt reported financial relationships with more than 20 pharmaceutical companies, including Abbott Medical.

Patients with thrombotic antiphospholipid syndrome are better treated with a vitamin K antagonist, such as warfarin, rather than a direct oral anticoagulant (DOAC), a new systematic review and meta-analysis suggests.

“Our study is showing that in randomized controlled trials in patients with thrombotic antiphospholipid syndrome, the risk of arterial thrombotic events, particularly stroke, is significantly increased with DOACs vs. vitamin K antagonists,” senior author, Behnood Bikdeli, MD, Brigham and Women’s Hospital, Boston, told this news organization. “These results probably suggest that DOACs are not the optimal regimen for patients with thrombotic antiphospholipid syndrome.”

The study was published online in the Journal of the American College of Cardiology.
 

Autoimmune disorder

Thrombotic antiphospholipid syndrome is a systemic autoimmune disorder characterized by recurrent arterial and/or venous thrombotic events.

Dr. Bikdeli estimates that antiphospholipid syndrome is the cause of 50,000-100,000 strokes, 100,000 cases of myocardial infarction, and 30,000 cases of deep vein thrombosis every year.

“It is a serious condition, and these are a high-risk and complex group of patients,” he said.

The standard treatment has been anticoagulation with a vitamin K antagonist such as warfarin. “But this is a cumbersome treatment, with many drug interactions and the need for INR [International Normalized Ratio] monitoring, which can be difficult to manage in patients with antiphospholipid syndrome as there can sometimes be falsely abnormal numbers,” Dr. Bikdeli noted. “Because of these challenges, it looked very promising to explore the use of DOACs in this population.”

Four main randomized trials have been conducted to investigate the use of DOACs in antiphospholipid syndrome – three with rivaroxaban and one with apixaban. “These trials were all quite small and, while they did not show definite results, some of them suggested nonsignificant findings of slightly worse outcomes for DOACs vs. vitamin K antagonists. But there is a lot of uncertainty, and it is difficult to look at subgroups in such small trials,” Dr. Bikdeli said. “There are many questions remaining about whether we should use DOACs in patients with antiphospholipid syndrome and, if so, which particular subgroups.”

The authors therefore performed a systematic review and meta-analysis of randomized controlled trials that compared DOACs with vitamin K antagonists in patients with antiphospholipid syndrome. They also contacted the principal investigators of the trials to obtain additional unpublished aggregate level data on specific subgroups.

Four open-label randomized controlled trials involving 472 patients were included in the meta-analysis.

Overall, the use of DOACs, compared with vitamin K antagonists, was associated with increased odds of subsequent arterial thrombotic events (odds ratio, 5.43; P < .001), especially stroke.

The odds of subsequent venous thrombotic events or major bleeding were not significantly different between the two groups. Most findings were consistent within subgroups.

“Our results show that use of DOACs vs. vitamin K antagonists is associated with increased risk of arterial thrombotic events – a risk that is primarily driven by a significant increase in the risk of stroke,” Dr. Bikdeli commented.

When looking at subgroups of interest, it was previously thought that DOACs may not be so effective in the so-called “triple-positive” antiphospholipid patients. These patients have three different types of antibodies and have the highest risk of thrombosis, Dr. Bikdeli noted.

“But one of the interesting findings of our study is that the results are actually consistent in women vs. men and in people who have triple-positive antibodies and those who had double- or single-positive antibodies,” he said. “Our analyses did not show effect modification by antibody subgroups. They suggest similar trends towards worse outcomes in all subgroups.”   

“From these results, I would be similarly concerned to use DOACs even if someone has double-positive or single-positive antiphospholipid antibodies,” he added.

Dr. Bikdeli said he would still recommend shared decision-making with patients. “If I have a patient who has thrombotic antiphospholipid syndrome, I would share my reservation about DOACs, but there are multiple factors that come into decision-making. If someone has difficulty with checking INRs, we may make an informed choice and still use a DOAC, but patients need to know that there is likely an excess risk of subsequent arterial events with DOACs, compared with a vitamin K antagonist.”

He noted that it is still not completely clear on the situation for people with single-positive antiphospholipid syndrome or the type of antibody that is present. It is also possible that a higher dose of DOAC could be more effective, a strategy that is being investigated in a separate randomized trial currently ongoing.

“But for routine practice I would have concerns about using DOACs in antiphospholipid syndrome patients in general,” he said. “For triple positive there is more data and greater concern, but I wouldn’t give a pass for a double- or single-positive patient either.”

The reason why DOACs would be less effective than vitamin K antagonists in antiphospholipid syndrome is not known.

“That is the million-dollar question,” Dr. Bikdeli commented. “DOACs have been such helpful drugs for many patients and clinicians as well. But we have seen that they are not optimal in a series of scenarios now – patients with mechanical heart valves, patients with rheumatic [atrial fibrillaton], and now patients with thrombotic antiphospholipid syndrome.”

One hypothesis is that these patients have some more components of inflammation and are more prone to blood clots, and because vitamin K antagonists work at several parts of the coagulation cascade, they might be more successful, compared with the more targeted DOAC therapy. “But I think we need more studies to fully understand this,” he said.

‘Important implications’

In an accompanying editorial,Mark A. Crowther, MD, McMaster University, Hamilton, Ont., and Aubrey E. Jones, PharmD, and Daniel M. Witt, PharmD, both of the University of Utah College of Pharmacy, Salt Lake City, say that: “As the quality of the evidence was rated ‘high’ for the arterial thrombosis outcome and ‘moderate’ for the venous thrombosis and bleeding outcomes, these results should lead to a revision of evidence-based guidelines to recommend against using DOACs as an option for most patients with thrombotic antiphospholipid syndrome.”

They add that this recommendation for vitamin K antagonists also applies to patients previously thought to be at lower risk from antiphospholipid syndrome – including those with only one or two positive serological tests and those with only prior venous thrombosis.

The editorialists point out that this will have important implications, particularly for the accurate diagnosis of antiphospholipid syndrome, including confirmation and documentation of positive laboratory tests at least 12 weeks after the initial positive test.

They recommend that while awaiting confirmatory testing, patients with suspected antiphospholipid syndrome should avoid DOACs, and that “strong consideration” should be given to switching essentially all antiphospholipid syndrome patients currently receiving DOACs to vitamin K antagonists.

Dr. Bikdeli is a consulting expert, on behalf of the plaintiff, for litigation related to two specific brand models of IVC filters and is supported by the Scott Schoen and Nancy Adams IGNITE Award from the Mary Horrigan Connors Center for Women’s Health and Gender Biology at Brigham and Women’s Hospital and a Career Development Award from the American Heart Association and VIVA Physicians. Dr. Crowther has received personal funding from AstraZeneca, Precision Biologics, Hemostasis Reference Laboratories, Syneos Health, Bayer, Pfizer, and CSL Behring; and holds the Leo Pharma Chair in Thromboembolism Research, which is endowed at McMaster University. Dr. Jones is supported by a career development award from the National Heart, Lung, and Blood Institute; and Dr. Witt is supported by grant funding from the Agency for Healthcare Research and Quality.

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

Patients with thrombotic antiphospholipid syndrome are better treated with a vitamin K antagonist, such as warfarin, rather than a direct oral anticoagulant (DOAC), a new systematic review and meta-analysis suggests.

“Our study is showing that in randomized controlled trials in patients with thrombotic antiphospholipid syndrome, the risk of arterial thrombotic events, particularly stroke, is significantly increased with DOACs vs. vitamin K antagonists,” senior author, Behnood Bikdeli, MD, Brigham and Women’s Hospital, Boston, told this news organization. “These results probably suggest that DOACs are not the optimal regimen for patients with thrombotic antiphospholipid syndrome.”

The study was published online in the Journal of the American College of Cardiology.
 

Autoimmune disorder

Thrombotic antiphospholipid syndrome is a systemic autoimmune disorder characterized by recurrent arterial and/or venous thrombotic events.

Dr. Bikdeli estimates that antiphospholipid syndrome is the cause of 50,000-100,000 strokes, 100,000 cases of myocardial infarction, and 30,000 cases of deep vein thrombosis every year.

“It is a serious condition, and these are a high-risk and complex group of patients,” he said.

The standard treatment has been anticoagulation with a vitamin K antagonist such as warfarin. “But this is a cumbersome treatment, with many drug interactions and the need for INR [International Normalized Ratio] monitoring, which can be difficult to manage in patients with antiphospholipid syndrome as there can sometimes be falsely abnormal numbers,” Dr. Bikdeli noted. “Because of these challenges, it looked very promising to explore the use of DOACs in this population.”

Four main randomized trials have been conducted to investigate the use of DOACs in antiphospholipid syndrome – three with rivaroxaban and one with apixaban. “These trials were all quite small and, while they did not show definite results, some of them suggested nonsignificant findings of slightly worse outcomes for DOACs vs. vitamin K antagonists. But there is a lot of uncertainty, and it is difficult to look at subgroups in such small trials,” Dr. Bikdeli said. “There are many questions remaining about whether we should use DOACs in patients with antiphospholipid syndrome and, if so, which particular subgroups.”

The authors therefore performed a systematic review and meta-analysis of randomized controlled trials that compared DOACs with vitamin K antagonists in patients with antiphospholipid syndrome. They also contacted the principal investigators of the trials to obtain additional unpublished aggregate level data on specific subgroups.

Four open-label randomized controlled trials involving 472 patients were included in the meta-analysis.

Overall, the use of DOACs, compared with vitamin K antagonists, was associated with increased odds of subsequent arterial thrombotic events (odds ratio, 5.43; P < .001), especially stroke.

The odds of subsequent venous thrombotic events or major bleeding were not significantly different between the two groups. Most findings were consistent within subgroups.

“Our results show that use of DOACs vs. vitamin K antagonists is associated with increased risk of arterial thrombotic events – a risk that is primarily driven by a significant increase in the risk of stroke,” Dr. Bikdeli commented.

When looking at subgroups of interest, it was previously thought that DOACs may not be so effective in the so-called “triple-positive” antiphospholipid patients. These patients have three different types of antibodies and have the highest risk of thrombosis, Dr. Bikdeli noted.

“But one of the interesting findings of our study is that the results are actually consistent in women vs. men and in people who have triple-positive antibodies and those who had double- or single-positive antibodies,” he said. “Our analyses did not show effect modification by antibody subgroups. They suggest similar trends towards worse outcomes in all subgroups.”   

“From these results, I would be similarly concerned to use DOACs even if someone has double-positive or single-positive antiphospholipid antibodies,” he added.

Dr. Bikdeli said he would still recommend shared decision-making with patients. “If I have a patient who has thrombotic antiphospholipid syndrome, I would share my reservation about DOACs, but there are multiple factors that come into decision-making. If someone has difficulty with checking INRs, we may make an informed choice and still use a DOAC, but patients need to know that there is likely an excess risk of subsequent arterial events with DOACs, compared with a vitamin K antagonist.”

He noted that it is still not completely clear on the situation for people with single-positive antiphospholipid syndrome or the type of antibody that is present. It is also possible that a higher dose of DOAC could be more effective, a strategy that is being investigated in a separate randomized trial currently ongoing.

“But for routine practice I would have concerns about using DOACs in antiphospholipid syndrome patients in general,” he said. “For triple positive there is more data and greater concern, but I wouldn’t give a pass for a double- or single-positive patient either.”

The reason why DOACs would be less effective than vitamin K antagonists in antiphospholipid syndrome is not known.

“That is the million-dollar question,” Dr. Bikdeli commented. “DOACs have been such helpful drugs for many patients and clinicians as well. But we have seen that they are not optimal in a series of scenarios now – patients with mechanical heart valves, patients with rheumatic [atrial fibrillaton], and now patients with thrombotic antiphospholipid syndrome.”

One hypothesis is that these patients have some more components of inflammation and are more prone to blood clots, and because vitamin K antagonists work at several parts of the coagulation cascade, they might be more successful, compared with the more targeted DOAC therapy. “But I think we need more studies to fully understand this,” he said.

‘Important implications’

In an accompanying editorial,Mark A. Crowther, MD, McMaster University, Hamilton, Ont., and Aubrey E. Jones, PharmD, and Daniel M. Witt, PharmD, both of the University of Utah College of Pharmacy, Salt Lake City, say that: “As the quality of the evidence was rated ‘high’ for the arterial thrombosis outcome and ‘moderate’ for the venous thrombosis and bleeding outcomes, these results should lead to a revision of evidence-based guidelines to recommend against using DOACs as an option for most patients with thrombotic antiphospholipid syndrome.”

They add that this recommendation for vitamin K antagonists also applies to patients previously thought to be at lower risk from antiphospholipid syndrome – including those with only one or two positive serological tests and those with only prior venous thrombosis.

The editorialists point out that this will have important implications, particularly for the accurate diagnosis of antiphospholipid syndrome, including confirmation and documentation of positive laboratory tests at least 12 weeks after the initial positive test.

They recommend that while awaiting confirmatory testing, patients with suspected antiphospholipid syndrome should avoid DOACs, and that “strong consideration” should be given to switching essentially all antiphospholipid syndrome patients currently receiving DOACs to vitamin K antagonists.

Dr. Bikdeli is a consulting expert, on behalf of the plaintiff, for litigation related to two specific brand models of IVC filters and is supported by the Scott Schoen and Nancy Adams IGNITE Award from the Mary Horrigan Connors Center for Women’s Health and Gender Biology at Brigham and Women’s Hospital and a Career Development Award from the American Heart Association and VIVA Physicians. Dr. Crowther has received personal funding from AstraZeneca, Precision Biologics, Hemostasis Reference Laboratories, Syneos Health, Bayer, Pfizer, and CSL Behring; and holds the Leo Pharma Chair in Thromboembolism Research, which is endowed at McMaster University. Dr. Jones is supported by a career development award from the National Heart, Lung, and Blood Institute; and Dr. Witt is supported by grant funding from the Agency for Healthcare Research and Quality.

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

Patients with thrombotic antiphospholipid syndrome are better treated with a vitamin K antagonist, such as warfarin, rather than a direct oral anticoagulant (DOAC), a new systematic review and meta-analysis suggests.

“Our study is showing that in randomized controlled trials in patients with thrombotic antiphospholipid syndrome, the risk of arterial thrombotic events, particularly stroke, is significantly increased with DOACs vs. vitamin K antagonists,” senior author, Behnood Bikdeli, MD, Brigham and Women’s Hospital, Boston, told this news organization. “These results probably suggest that DOACs are not the optimal regimen for patients with thrombotic antiphospholipid syndrome.”

The study was published online in the Journal of the American College of Cardiology.
 

Autoimmune disorder

Thrombotic antiphospholipid syndrome is a systemic autoimmune disorder characterized by recurrent arterial and/or venous thrombotic events.

Dr. Bikdeli estimates that antiphospholipid syndrome is the cause of 50,000-100,000 strokes, 100,000 cases of myocardial infarction, and 30,000 cases of deep vein thrombosis every year.

“It is a serious condition, and these are a high-risk and complex group of patients,” he said.

The standard treatment has been anticoagulation with a vitamin K antagonist such as warfarin. “But this is a cumbersome treatment, with many drug interactions and the need for INR [International Normalized Ratio] monitoring, which can be difficult to manage in patients with antiphospholipid syndrome as there can sometimes be falsely abnormal numbers,” Dr. Bikdeli noted. “Because of these challenges, it looked very promising to explore the use of DOACs in this population.”

Four main randomized trials have been conducted to investigate the use of DOACs in antiphospholipid syndrome – three with rivaroxaban and one with apixaban. “These trials were all quite small and, while they did not show definite results, some of them suggested nonsignificant findings of slightly worse outcomes for DOACs vs. vitamin K antagonists. But there is a lot of uncertainty, and it is difficult to look at subgroups in such small trials,” Dr. Bikdeli said. “There are many questions remaining about whether we should use DOACs in patients with antiphospholipid syndrome and, if so, which particular subgroups.”

The authors therefore performed a systematic review and meta-analysis of randomized controlled trials that compared DOACs with vitamin K antagonists in patients with antiphospholipid syndrome. They also contacted the principal investigators of the trials to obtain additional unpublished aggregate level data on specific subgroups.

Four open-label randomized controlled trials involving 472 patients were included in the meta-analysis.

Overall, the use of DOACs, compared with vitamin K antagonists, was associated with increased odds of subsequent arterial thrombotic events (odds ratio, 5.43; P < .001), especially stroke.

The odds of subsequent venous thrombotic events or major bleeding were not significantly different between the two groups. Most findings were consistent within subgroups.

“Our results show that use of DOACs vs. vitamin K antagonists is associated with increased risk of arterial thrombotic events – a risk that is primarily driven by a significant increase in the risk of stroke,” Dr. Bikdeli commented.

When looking at subgroups of interest, it was previously thought that DOACs may not be so effective in the so-called “triple-positive” antiphospholipid patients. These patients have three different types of antibodies and have the highest risk of thrombosis, Dr. Bikdeli noted.

“But one of the interesting findings of our study is that the results are actually consistent in women vs. men and in people who have triple-positive antibodies and those who had double- or single-positive antibodies,” he said. “Our analyses did not show effect modification by antibody subgroups. They suggest similar trends towards worse outcomes in all subgroups.”   

“From these results, I would be similarly concerned to use DOACs even if someone has double-positive or single-positive antiphospholipid antibodies,” he added.

Dr. Bikdeli said he would still recommend shared decision-making with patients. “If I have a patient who has thrombotic antiphospholipid syndrome, I would share my reservation about DOACs, but there are multiple factors that come into decision-making. If someone has difficulty with checking INRs, we may make an informed choice and still use a DOAC, but patients need to know that there is likely an excess risk of subsequent arterial events with DOACs, compared with a vitamin K antagonist.”

He noted that it is still not completely clear on the situation for people with single-positive antiphospholipid syndrome or the type of antibody that is present. It is also possible that a higher dose of DOAC could be more effective, a strategy that is being investigated in a separate randomized trial currently ongoing.

“But for routine practice I would have concerns about using DOACs in antiphospholipid syndrome patients in general,” he said. “For triple positive there is more data and greater concern, but I wouldn’t give a pass for a double- or single-positive patient either.”

The reason why DOACs would be less effective than vitamin K antagonists in antiphospholipid syndrome is not known.

“That is the million-dollar question,” Dr. Bikdeli commented. “DOACs have been such helpful drugs for many patients and clinicians as well. But we have seen that they are not optimal in a series of scenarios now – patients with mechanical heart valves, patients with rheumatic [atrial fibrillaton], and now patients with thrombotic antiphospholipid syndrome.”

One hypothesis is that these patients have some more components of inflammation and are more prone to blood clots, and because vitamin K antagonists work at several parts of the coagulation cascade, they might be more successful, compared with the more targeted DOAC therapy. “But I think we need more studies to fully understand this,” he said.

‘Important implications’

In an accompanying editorial,Mark A. Crowther, MD, McMaster University, Hamilton, Ont., and Aubrey E. Jones, PharmD, and Daniel M. Witt, PharmD, both of the University of Utah College of Pharmacy, Salt Lake City, say that: “As the quality of the evidence was rated ‘high’ for the arterial thrombosis outcome and ‘moderate’ for the venous thrombosis and bleeding outcomes, these results should lead to a revision of evidence-based guidelines to recommend against using DOACs as an option for most patients with thrombotic antiphospholipid syndrome.”

They add that this recommendation for vitamin K antagonists also applies to patients previously thought to be at lower risk from antiphospholipid syndrome – including those with only one or two positive serological tests and those with only prior venous thrombosis.

The editorialists point out that this will have important implications, particularly for the accurate diagnosis of antiphospholipid syndrome, including confirmation and documentation of positive laboratory tests at least 12 weeks after the initial positive test.

They recommend that while awaiting confirmatory testing, patients with suspected antiphospholipid syndrome should avoid DOACs, and that “strong consideration” should be given to switching essentially all antiphospholipid syndrome patients currently receiving DOACs to vitamin K antagonists.

Dr. Bikdeli is a consulting expert, on behalf of the plaintiff, for litigation related to two specific brand models of IVC filters and is supported by the Scott Schoen and Nancy Adams IGNITE Award from the Mary Horrigan Connors Center for Women’s Health and Gender Biology at Brigham and Women’s Hospital and a Career Development Award from the American Heart Association and VIVA Physicians. Dr. Crowther has received personal funding from AstraZeneca, Precision Biologics, Hemostasis Reference Laboratories, Syneos Health, Bayer, Pfizer, and CSL Behring; and holds the Leo Pharma Chair in Thromboembolism Research, which is endowed at McMaster University. Dr. Jones is supported by a career development award from the National Heart, Lung, and Blood Institute; and Dr. Witt is supported by grant funding from the Agency for Healthcare Research and Quality.

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

NEW ORLEANS – Addressing an audience of hematologists, an immunologist and a thrombosis specialist presented insights on two hot COVID-19 topics: strategies the virus uses to breach the immune system and the diagnosis and treatment of vaccine-related blood clots.

In a presidential symposium at the annual meeting of the American Society of Hematology, La Jolla Institute of Immunology scientist Shane Crotty, PhD, explained that COVID-19 has a “superpower” that allows it to be “extraordinarily stealthy.”

The virus, he said, can sneak past the body’s innate immune system, which normally responds to viral invaders within minutes to hours. “This is why you have people with high viral loads who are presymptomatic. Their innate immune system hasn’t even recognized that these people are infected.”

The adaptive immune system kicks in later. As Dr. Crotty noted, adaptive immunity is composed of three branches: B cells (the source of antibodies), CD4 “helper” T cells, and CD8 “killer” T cells. In the first year of COVID-19, his team tracked 188 subjects post infection in what he said was the largest study of its kind ever for any viral infection.

“In 8 months, 95% of people who had been infected still had measurable immune memory. In fact, most of them had multiple different compartments of immune memory still detectable, and it was likely that these individuals would still have that memory years into the future. Based on that, we made the prediction that most people who have had COVID-19 would likely be protected from reinfection – at least by severe infections – for 3 years into the future. That prediction has widely held up even in the presence of variants which weren’t around at the time.”

How do vaccines fit into the immunity picture? Dr. Crotty’s lab has tracked subjects who received 4 vaccines – Moderna, Pfizer/BioNTech, Janssen/Johnson & Johnson, and Novavax. Researchers found that the mRNA vaccines, Moderna and Pfizer/BioNTech, “are fantastic at eliciting neutralizing antibodies quickly, but then they drop off rapidly at two doses and actually continue to drop for 10 months.”

Still, he said, “when we take a look at 6 months, actually the vaccines are doing pretty incredibly well. If we compare them to an average infected individual, the mRNA vaccines all have higher neutralizing antibody titers.”

What’s happening? According to Dr. Crotty, B cells are “making guesses about what other variants might look like.” But he said research suggests that an important component of this process – germinal centers – aren’t made in some vaccinated people who are immunocompromised. (Germinal centers have been described as “microbial boot camps” for B cells.)

The good news, Dr. Crotty noted, is that a greater understanding of how COVID-19 penetrates various layers of adaptive immune defenses will lead to better ways to protect the immunocompromised. “If you think about immunity in this layered defense way, there are various ways that it could be enhanced for individuals in different categories,” he said.

Hematologist Beverley J. Hunt, MD, OBE, of St. Thomas’ Hospital/King’s Healthcare Partners in London, spoke at the ASH presidential symposium about blood clots and COVID-19. As she noted, concern arose about vaccine-related blood clots. A British team “managed quickly to come up with a diagnostic criteria,” she said. “We looked at nearly 300 patients and essentially came up with a scoring system.”

The diagnostic criteria was based on an analysis of definite or probable cases of vaccine-induced immune thrombocytopenia and thrombosis (VITT) – all related to the AstraZeneca vaccine. The criteria appeared in a 2021 study in the New England Journal of Medicine.

The report’s data didn’t allow it to compare the efficacy of anticoagulants. However, Dr. Hunt noted that clinicians turned to plasma exchange in patients with low platelet counts and extensive thrombosis. The report stated “survival after plasma exchange was 90%, considerably better than would be predicted given the baseline characteristics.”

“Now we’re following up,” Dr. Hunt said. One question to answer: Is long-term anticoagulation helpful? “We have many patients,” she said, “who are taking an anti-platelet factor out of habit.”

Dr. Crotty and Dr. Hunt report no disclosures. This reporter is a paid participant in a COVID vaccine study run by Dr. Crotty’s lab.

NEW ORLEANS – Addressing an audience of hematologists, an immunologist and a thrombosis specialist presented insights on two hot COVID-19 topics: strategies the virus uses to breach the immune system and the diagnosis and treatment of vaccine-related blood clots.

In a presidential symposium at the annual meeting of the American Society of Hematology, La Jolla Institute of Immunology scientist Shane Crotty, PhD, explained that COVID-19 has a “superpower” that allows it to be “extraordinarily stealthy.”

The virus, he said, can sneak past the body’s innate immune system, which normally responds to viral invaders within minutes to hours. “This is why you have people with high viral loads who are presymptomatic. Their innate immune system hasn’t even recognized that these people are infected.”

The adaptive immune system kicks in later. As Dr. Crotty noted, adaptive immunity is composed of three branches: B cells (the source of antibodies), CD4 “helper” T cells, and CD8 “killer” T cells. In the first year of COVID-19, his team tracked 188 subjects post infection in what he said was the largest study of its kind ever for any viral infection.

“In 8 months, 95% of people who had been infected still had measurable immune memory. In fact, most of them had multiple different compartments of immune memory still detectable, and it was likely that these individuals would still have that memory years into the future. Based on that, we made the prediction that most people who have had COVID-19 would likely be protected from reinfection – at least by severe infections – for 3 years into the future. That prediction has widely held up even in the presence of variants which weren’t around at the time.”

How do vaccines fit into the immunity picture? Dr. Crotty’s lab has tracked subjects who received 4 vaccines – Moderna, Pfizer/BioNTech, Janssen/Johnson & Johnson, and Novavax. Researchers found that the mRNA vaccines, Moderna and Pfizer/BioNTech, “are fantastic at eliciting neutralizing antibodies quickly, but then they drop off rapidly at two doses and actually continue to drop for 10 months.”

Still, he said, “when we take a look at 6 months, actually the vaccines are doing pretty incredibly well. If we compare them to an average infected individual, the mRNA vaccines all have higher neutralizing antibody titers.”

What’s happening? According to Dr. Crotty, B cells are “making guesses about what other variants might look like.” But he said research suggests that an important component of this process – germinal centers – aren’t made in some vaccinated people who are immunocompromised. (Germinal centers have been described as “microbial boot camps” for B cells.)

The good news, Dr. Crotty noted, is that a greater understanding of how COVID-19 penetrates various layers of adaptive immune defenses will lead to better ways to protect the immunocompromised. “If you think about immunity in this layered defense way, there are various ways that it could be enhanced for individuals in different categories,” he said.

Hematologist Beverley J. Hunt, MD, OBE, of St. Thomas’ Hospital/King’s Healthcare Partners in London, spoke at the ASH presidential symposium about blood clots and COVID-19. As she noted, concern arose about vaccine-related blood clots. A British team “managed quickly to come up with a diagnostic criteria,” she said. “We looked at nearly 300 patients and essentially came up with a scoring system.”

The diagnostic criteria was based on an analysis of definite or probable cases of vaccine-induced immune thrombocytopenia and thrombosis (VITT) – all related to the AstraZeneca vaccine. The criteria appeared in a 2021 study in the New England Journal of Medicine.

The report’s data didn’t allow it to compare the efficacy of anticoagulants. However, Dr. Hunt noted that clinicians turned to plasma exchange in patients with low platelet counts and extensive thrombosis. The report stated “survival after plasma exchange was 90%, considerably better than would be predicted given the baseline characteristics.”

“Now we’re following up,” Dr. Hunt said. One question to answer: Is long-term anticoagulation helpful? “We have many patients,” she said, “who are taking an anti-platelet factor out of habit.”

Dr. Crotty and Dr. Hunt report no disclosures. This reporter is a paid participant in a COVID vaccine study run by Dr. Crotty’s lab.

NEW ORLEANS – Addressing an audience of hematologists, an immunologist and a thrombosis specialist presented insights on two hot COVID-19 topics: strategies the virus uses to breach the immune system and the diagnosis and treatment of vaccine-related blood clots.

In a presidential symposium at the annual meeting of the American Society of Hematology, La Jolla Institute of Immunology scientist Shane Crotty, PhD, explained that COVID-19 has a “superpower” that allows it to be “extraordinarily stealthy.”

The virus, he said, can sneak past the body’s innate immune system, which normally responds to viral invaders within minutes to hours. “This is why you have people with high viral loads who are presymptomatic. Their innate immune system hasn’t even recognized that these people are infected.”

The adaptive immune system kicks in later. As Dr. Crotty noted, adaptive immunity is composed of three branches: B cells (the source of antibodies), CD4 “helper” T cells, and CD8 “killer” T cells. In the first year of COVID-19, his team tracked 188 subjects post infection in what he said was the largest study of its kind ever for any viral infection.

“In 8 months, 95% of people who had been infected still had measurable immune memory. In fact, most of them had multiple different compartments of immune memory still detectable, and it was likely that these individuals would still have that memory years into the future. Based on that, we made the prediction that most people who have had COVID-19 would likely be protected from reinfection – at least by severe infections – for 3 years into the future. That prediction has widely held up even in the presence of variants which weren’t around at the time.”

How do vaccines fit into the immunity picture? Dr. Crotty’s lab has tracked subjects who received 4 vaccines – Moderna, Pfizer/BioNTech, Janssen/Johnson & Johnson, and Novavax. Researchers found that the mRNA vaccines, Moderna and Pfizer/BioNTech, “are fantastic at eliciting neutralizing antibodies quickly, but then they drop off rapidly at two doses and actually continue to drop for 10 months.”

Still, he said, “when we take a look at 6 months, actually the vaccines are doing pretty incredibly well. If we compare them to an average infected individual, the mRNA vaccines all have higher neutralizing antibody titers.”

What’s happening? According to Dr. Crotty, B cells are “making guesses about what other variants might look like.” But he said research suggests that an important component of this process – germinal centers – aren’t made in some vaccinated people who are immunocompromised. (Germinal centers have been described as “microbial boot camps” for B cells.)

The good news, Dr. Crotty noted, is that a greater understanding of how COVID-19 penetrates various layers of adaptive immune defenses will lead to better ways to protect the immunocompromised. “If you think about immunity in this layered defense way, there are various ways that it could be enhanced for individuals in different categories,” he said.

Hematologist Beverley J. Hunt, MD, OBE, of St. Thomas’ Hospital/King’s Healthcare Partners in London, spoke at the ASH presidential symposium about blood clots and COVID-19. As she noted, concern arose about vaccine-related blood clots. A British team “managed quickly to come up with a diagnostic criteria,” she said. “We looked at nearly 300 patients and essentially came up with a scoring system.”

The diagnostic criteria was based on an analysis of definite or probable cases of vaccine-induced immune thrombocytopenia and thrombosis (VITT) – all related to the AstraZeneca vaccine. The criteria appeared in a 2021 study in the New England Journal of Medicine.

The report’s data didn’t allow it to compare the efficacy of anticoagulants. However, Dr. Hunt noted that clinicians turned to plasma exchange in patients with low platelet counts and extensive thrombosis. The report stated “survival after plasma exchange was 90%, considerably better than would be predicted given the baseline characteristics.”

“Now we’re following up,” Dr. Hunt said. One question to answer: Is long-term anticoagulation helpful? “We have many patients,” she said, “who are taking an anti-platelet factor out of habit.”

Dr. Crotty and Dr. Hunt report no disclosures. This reporter is a paid participant in a COVID vaccine study run by Dr. Crotty’s lab.

NEW ORLEANS – Patients with chronic immune thrombocytopenia (ITP) fared better on intravenous efgartigimod (Vyvgart) than a placebo, a new study found. Still, only 21.8% of subjects who received the biologic reached the primary endpoint of sustained platelet count response, an indication that most patients won’t benefit.

Nevertheless, “efgartigimod demonstrated a strong clinical benefit,” said hematologist/oncologist and study lead author Catherine M. Broome, MD, of Georgetown University, Washington, in an interview about the findings presented at the annual meeting of the American Society of Hematology.

“The data showed statistically significant and clinically meaningful improvement in platelet counts over placebo, a fast and robust platelet count improvement over placebo, and the confirmed ability for every-other-week dosing, as well as a favorable safety and tolerability profile, consistent with previous clinical trials,” she said.

In ITP, according to the National Organization for Rare Disorders, “the patient’s immune system tags their own platelets as ‘foreign,’ leading their B lymphocytes and plasma cells to produce self-reactive antiplatelet antibodies that attach to platelet surface.”

The prevalence of ITP among adults in the United States is 9.5 per 100,000, NORD says. Children are also affected, but they usually recover. An estimated 60% of adults recover within 3 years.

Treatment options include corticosteroids and intravenous immunoglobulin.

“There are a relatively large number of current treatments, and they tend to work well for most patients. However, there are a minority of patients who do not respond to or tolerate current therapies and would benefit from new treatment options,” said hematologist Adam C. Cuker, MD, MS, of Penn Medicine, Philadelphia, in an interview. He is chair of ASH’s Committee on Quality.

For the new industry-funded ADVANCE study, researchers recruited patients with long-standing, persistent/chronic ITP (an average of two platelet counts of < 30×109/L).

Subjects were randomized 2:1 to receive 10 mg/kg of efgartigimod weekly – or response-dependent doses after the first 4 weeks – or placebo for 24 weeks. There were 86 patients in the intervention group and 45 in the placebo group. Overall, 60 were male and 71 were female; 107 were under 65; 121 were White and 8 were Asian. Details about the others were not provided.

Subjects were allowed to take several other drugs such as oral corticosteroids, and oral thrombopoietin receptor agonists other than romiplostim.

Per the primary endpoint, 17/78 (21.8%) reached a sustained response, defined as platelet counts ≥ 50×109/L in ≥ four of six visits between weeks 19 and 24 without intercurrent events, such as rescue therapy at week 12 or later. In the placebo group, 2/40 reached this response (5.0%; P = .0316).

“The primary endpoint was a high bar to achieve,” Dr. Broome said. “This was a difficult-to-treat patient population heavily pretreated and refractory to other treatments: 68.6% of patients in the efgartigimod arm had received three or more prior ITP treatments.”

She added that “subgroup analyses – including prior ITP therapy, time since diagnosis, baseline platelet count and age/region demographics – of patients who achieved the primary endpoint all favored efgartigimod over placebo.”

Side effects were extremely common among both the drug and placebo groups, and serious adverse events were common in the placebo group. No deaths were reported.

Efgartigimod, a neonatal Fc receptor blocker, is an extremely expensive drug that is Food and Drug Administration approved for some cases of generalized myasthenia gravis. According to a report in Neurology earlier this year, company statements listed its price as $855,400 a year; the report questioned its cost-effectiveness.

In response to a query about price, Luc Truyen, MD, PhD, chief medical officer of drug manufacturer Argenx, declined to talk about cost – a sensitive topic for pharmaceutical companies. “It is too early to discuss pricing and access as no regulatory submission or discussion has occurred,” Dr. Truyen said.

Penn Medicine’s Dr. Cuker, who is familiar with the study findings, said the primary endpoint results are not very impressive. “That said, it should be borne in mind that the patients enrolled in the trial tended to be heavily pretreated and refractory patients,” he said.

As for adverse effects, he said the drug “appears to be safe and well tolerated. The biggest theoretical concern with this class of drugs is an increased risk of infection due to lowering of IgG levels.”

It would be helpful to have trials that directly compare second-line therapies in ITP, he added. “Unfortunately, no such trials exist, and pharmaceutical companies would not be motivated to conduct them.”

For now, he said, off-label use of efgartigimod “may be reasonable, but only in rare situations where other approved and better established ITP treatments have been exhausted.”

What’s next? According to Dr. Broome, another trial is currently evaluating efgartigimod for the treatment of primary ITP, with top-line data expected in the second half of 2023.

The study was funded by Argenx. Dr. Broome discloses honoraria from Alexion, Argenx, Apellis, and Sano. Dr. Truyen’s disclosures weren’t available. Dr. Cuker has no disclosures.

NEW ORLEANS – Patients with chronic immune thrombocytopenia (ITP) fared better on intravenous efgartigimod (Vyvgart) than a placebo, a new study found. Still, only 21.8% of subjects who received the biologic reached the primary endpoint of sustained platelet count response, an indication that most patients won’t benefit.

Nevertheless, “efgartigimod demonstrated a strong clinical benefit,” said hematologist/oncologist and study lead author Catherine M. Broome, MD, of Georgetown University, Washington, in an interview about the findings presented at the annual meeting of the American Society of Hematology.

“The data showed statistically significant and clinically meaningful improvement in platelet counts over placebo, a fast and robust platelet count improvement over placebo, and the confirmed ability for every-other-week dosing, as well as a favorable safety and tolerability profile, consistent with previous clinical trials,” she said.

In ITP, according to the National Organization for Rare Disorders, “the patient’s immune system tags their own platelets as ‘foreign,’ leading their B lymphocytes and plasma cells to produce self-reactive antiplatelet antibodies that attach to platelet surface.”

The prevalence of ITP among adults in the United States is 9.5 per 100,000, NORD says. Children are also affected, but they usually recover. An estimated 60% of adults recover within 3 years.

Treatment options include corticosteroids and intravenous immunoglobulin.

“There are a relatively large number of current treatments, and they tend to work well for most patients. However, there are a minority of patients who do not respond to or tolerate current therapies and would benefit from new treatment options,” said hematologist Adam C. Cuker, MD, MS, of Penn Medicine, Philadelphia, in an interview. He is chair of ASH’s Committee on Quality.

For the new industry-funded ADVANCE study, researchers recruited patients with long-standing, persistent/chronic ITP (an average of two platelet counts of < 30×109/L).

Subjects were randomized 2:1 to receive 10 mg/kg of efgartigimod weekly – or response-dependent doses after the first 4 weeks – or placebo for 24 weeks. There were 86 patients in the intervention group and 45 in the placebo group. Overall, 60 were male and 71 were female; 107 were under 65; 121 were White and 8 were Asian. Details about the others were not provided.

Subjects were allowed to take several other drugs such as oral corticosteroids, and oral thrombopoietin receptor agonists other than romiplostim.

Per the primary endpoint, 17/78 (21.8%) reached a sustained response, defined as platelet counts ≥ 50×109/L in ≥ four of six visits between weeks 19 and 24 without intercurrent events, such as rescue therapy at week 12 or later. In the placebo group, 2/40 reached this response (5.0%; P = .0316).

“The primary endpoint was a high bar to achieve,” Dr. Broome said. “This was a difficult-to-treat patient population heavily pretreated and refractory to other treatments: 68.6% of patients in the efgartigimod arm had received three or more prior ITP treatments.”

She added that “subgroup analyses – including prior ITP therapy, time since diagnosis, baseline platelet count and age/region demographics – of patients who achieved the primary endpoint all favored efgartigimod over placebo.”

Side effects were extremely common among both the drug and placebo groups, and serious adverse events were common in the placebo group. No deaths were reported.

Efgartigimod, a neonatal Fc receptor blocker, is an extremely expensive drug that is Food and Drug Administration approved for some cases of generalized myasthenia gravis. According to a report in Neurology earlier this year, company statements listed its price as $855,400 a year; the report questioned its cost-effectiveness.

In response to a query about price, Luc Truyen, MD, PhD, chief medical officer of drug manufacturer Argenx, declined to talk about cost – a sensitive topic for pharmaceutical companies. “It is too early to discuss pricing and access as no regulatory submission or discussion has occurred,” Dr. Truyen said.

Penn Medicine’s Dr. Cuker, who is familiar with the study findings, said the primary endpoint results are not very impressive. “That said, it should be borne in mind that the patients enrolled in the trial tended to be heavily pretreated and refractory patients,” he said.

As for adverse effects, he said the drug “appears to be safe and well tolerated. The biggest theoretical concern with this class of drugs is an increased risk of infection due to lowering of IgG levels.”

It would be helpful to have trials that directly compare second-line therapies in ITP, he added. “Unfortunately, no such trials exist, and pharmaceutical companies would not be motivated to conduct them.”

For now, he said, off-label use of efgartigimod “may be reasonable, but only in rare situations where other approved and better established ITP treatments have been exhausted.”

What’s next? According to Dr. Broome, another trial is currently evaluating efgartigimod for the treatment of primary ITP, with top-line data expected in the second half of 2023.

The study was funded by Argenx. Dr. Broome discloses honoraria from Alexion, Argenx, Apellis, and Sano. Dr. Truyen’s disclosures weren’t available. Dr. Cuker has no disclosures.

NEW ORLEANS – Patients with chronic immune thrombocytopenia (ITP) fared better on intravenous efgartigimod (Vyvgart) than a placebo, a new study found. Still, only 21.8% of subjects who received the biologic reached the primary endpoint of sustained platelet count response, an indication that most patients won’t benefit.

Nevertheless, “efgartigimod demonstrated a strong clinical benefit,” said hematologist/oncologist and study lead author Catherine M. Broome, MD, of Georgetown University, Washington, in an interview about the findings presented at the annual meeting of the American Society of Hematology.

“The data showed statistically significant and clinically meaningful improvement in platelet counts over placebo, a fast and robust platelet count improvement over placebo, and the confirmed ability for every-other-week dosing, as well as a favorable safety and tolerability profile, consistent with previous clinical trials,” she said.

In ITP, according to the National Organization for Rare Disorders, “the patient’s immune system tags their own platelets as ‘foreign,’ leading their B lymphocytes and plasma cells to produce self-reactive antiplatelet antibodies that attach to platelet surface.”

The prevalence of ITP among adults in the United States is 9.5 per 100,000, NORD says. Children are also affected, but they usually recover. An estimated 60% of adults recover within 3 years.

Treatment options include corticosteroids and intravenous immunoglobulin.

“There are a relatively large number of current treatments, and they tend to work well for most patients. However, there are a minority of patients who do not respond to or tolerate current therapies and would benefit from new treatment options,” said hematologist Adam C. Cuker, MD, MS, of Penn Medicine, Philadelphia, in an interview. He is chair of ASH’s Committee on Quality.

For the new industry-funded ADVANCE study, researchers recruited patients with long-standing, persistent/chronic ITP (an average of two platelet counts of < 30×109/L).

Subjects were randomized 2:1 to receive 10 mg/kg of efgartigimod weekly – or response-dependent doses after the first 4 weeks – or placebo for 24 weeks. There were 86 patients in the intervention group and 45 in the placebo group. Overall, 60 were male and 71 were female; 107 were under 65; 121 were White and 8 were Asian. Details about the others were not provided.

Subjects were allowed to take several other drugs such as oral corticosteroids, and oral thrombopoietin receptor agonists other than romiplostim.

Per the primary endpoint, 17/78 (21.8%) reached a sustained response, defined as platelet counts ≥ 50×109/L in ≥ four of six visits between weeks 19 and 24 without intercurrent events, such as rescue therapy at week 12 or later. In the placebo group, 2/40 reached this response (5.0%; P = .0316).

“The primary endpoint was a high bar to achieve,” Dr. Broome said. “This was a difficult-to-treat patient population heavily pretreated and refractory to other treatments: 68.6% of patients in the efgartigimod arm had received three or more prior ITP treatments.”

She added that “subgroup analyses – including prior ITP therapy, time since diagnosis, baseline platelet count and age/region demographics – of patients who achieved the primary endpoint all favored efgartigimod over placebo.”

Side effects were extremely common among both the drug and placebo groups, and serious adverse events were common in the placebo group. No deaths were reported.

Efgartigimod, a neonatal Fc receptor blocker, is an extremely expensive drug that is Food and Drug Administration approved for some cases of generalized myasthenia gravis. According to a report in Neurology earlier this year, company statements listed its price as $855,400 a year; the report questioned its cost-effectiveness.

In response to a query about price, Luc Truyen, MD, PhD, chief medical officer of drug manufacturer Argenx, declined to talk about cost – a sensitive topic for pharmaceutical companies. “It is too early to discuss pricing and access as no regulatory submission or discussion has occurred,” Dr. Truyen said.

Penn Medicine’s Dr. Cuker, who is familiar with the study findings, said the primary endpoint results are not very impressive. “That said, it should be borne in mind that the patients enrolled in the trial tended to be heavily pretreated and refractory patients,” he said.

As for adverse effects, he said the drug “appears to be safe and well tolerated. The biggest theoretical concern with this class of drugs is an increased risk of infection due to lowering of IgG levels.”

It would be helpful to have trials that directly compare second-line therapies in ITP, he added. “Unfortunately, no such trials exist, and pharmaceutical companies would not be motivated to conduct them.”

For now, he said, off-label use of efgartigimod “may be reasonable, but only in rare situations where other approved and better established ITP treatments have been exhausted.”

What’s next? According to Dr. Broome, another trial is currently evaluating efgartigimod for the treatment of primary ITP, with top-line data expected in the second half of 2023.

The study was funded by Argenx. Dr. Broome discloses honoraria from Alexion, Argenx, Apellis, and Sano. Dr. Truyen’s disclosures weren’t available. Dr. Cuker has no disclosures.