Arrhythmias & EP

The chance of surviving a cardiac arrest varies widely across hospitals in the United States, even when the arrest occurs in the highly controlled setting of a cardiac catheterization lab, a new study indicates.

Among 4,787 patients who arrested in the cath lab at 231 hospitals in the Get With The Guidelines (GWTG) Resuscitation registry, only about one-third survived to discharge. The median risk-adjusted survival rate (RASR) for all hospitals was 36%.

When stratified by RASR tertiles, however, median survival rates were 20%, 36%, and 52% for hospitals in the lowest, middle, and highest tertiles.

The odds of survival differed by 71% in similar patients presenting at two randomly selected hospitals (median odds ratio, 1.71; 95% confidence interval, 1.52-1.87).

“The good news is that cardiac arrests in the cath lab are relatively infrequent, but the bad news is that they still occur and the outcomes are, in general, pretty dismal,” senior author Deepak L. Bhatt, MD, MPH, said in an interview. “So anything that we can do as hospitals [and] health care systems to improve the care of these patients could go a long way.”

Hospital and patient factors

Possible explanations for the wide disparity in survival are the small number of cardiac arrests in the cath lab, the increasing complexity of cases, and the fact that patients are often very sick and may experience a problem during a procedure, or both, Dr. Bhatt suggested. Cath labs also vary in how they handle resuscitative efforts and access to advanced mechanical support devices, such as extracorporeal membrane oxygenation (ECMO).

“It’s not available in every cath lab and, even in hospitals that have it, they may not have a given ECMO circuit available at the exact time the patient’s having a cardiac arrest,” he said. “That’s one example of something that can make, in my opinion, a big difference in whether a patient lives or dies if they’re having a cardiac arrest but may not always be easily deployed.”

When the investigators looked specifically at hospital-level factors, only yearly volume of cardiac arrests in the cath lab was significantly associated with risk-adjusted survival (P < .01), whereas hospital size, rural or urban setting, teaching status, and geographic location were not.

In multivariate adjusted analyses, factors associated with survival to discharge included age (OR, 0.78), Black race (OR, 0.68), respiratory insufficiency (OR, 0.75), and initial cardiac arrest rhythm (OR, 3.32).

The median hospital RASR was 27% higher for ventricular tachycardia or ventricular fibrillation arrests than for arrests with a nonshockable rhythm of asystole and pulseless electrical activity (55% vs. 28%).

Notably, hospitals in the lowest tertile of risk-adjusted survival rates had a higher prevalence of non-White patients, renal and respiratory comorbidity, and arrest with nonshockable rhythm.

“We want to make sure as we’re contemplating whether to resuscitate a patient or how aggressively to resuscitate, that we aren’t letting any of our own biases, whether they have to do with race or potentially sex and gender, interfere with more objective assessments of whether the patient can in fact be saved or not,” Dr. Bhatt said.

Reached for comment, Srihari S. Naidu, MD, who chaired the writing group for the Society for Cardiovascular Angiography and Interventions’ (SCAI) consensus statement on cardiogenic shock and co-authored its document on best practices in the cardiac cath lab, said the findings show that survival in the cath lab is higher than that seen in-hospital. “Still, there’s a lot of room for improvement,” he said.

He was particularly struck by the variability in survival. “Underprivileged individuals, so those who are non-White populations and have respiratory and renal problems, they seem to have a worse survival and that makes sense – patients with comorbidities – but it feeds into the issue of, ‘Are we treating our population similarly in terms of their baseline race and ethnicity as a gap in care?’ ”

Better survival at hospitals with high volumes likely reflects more experience in handling these events, a rapid response and personnel to help with resuscitation, and overall better critical care and cath lab environment, said Dr. Naidu, director of the cardiac cath lab at Westchester Medical Center and professor of medicine at New York Medical College, both in Valhalla, N.Y.

“So that leads into two things,” he said. “One is that probably we should be working on having all high-risk patients go to centers of excellence. So, for example, [for] patients in shock, patients with STEMI, regionalization of care to the high-volume cath labs that are experienced in cardiac arrest and critical care management may be a way to go.”

“Second, if experience counts, can that experience be simulated through drills and simulations in the cath lab?” Dr. Naidu said. “Should all cath labs have drills where we have a cardiac arrest patient, and how would we respond to that? Who’s going to do the compressions? Where’s the mechanical support device? What are the things we need to have a seamless cardiac arrest protocol for arrests during the cath lab?”

Dr. Bhatt and colleagues acknowledge that despite adjustment for many key variables, the study lacked procedural details that may affect survival and information related to resuscitation efforts.

“We really do need to focus more research efforts, potentially more in the way of quality-improvement efforts, to try and help patients get these sorts of patients who are in dire straits to the cath lab but hopefully also through the hospital discharge and back home,” Dr. Bhatt said.

In an editorial accompanying the study, Matthew L. Tomey, MD, Icahn School of Medicine at Mount Sinai, New York, writes that the “findings and limitations of this study together sound a call to action.”

He also signaled the need for more research and for registries and reporting instruments to capture variables particular to in-laboratory cardiac arrest and resuscitation in the cardiac cath lab. “A necessary first step is the development of consensus data elements for supplemental reporting in cases of ILCA,” such as indication for cath lab presentation, timing of arrest relative to procedure, and cause of arrest.

Dr. Bhatt reported numerous relationships with industry. Dr. Naidu and Dr. Tomey report having no relevant financial relationships.

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

The chance of surviving a cardiac arrest varies widely across hospitals in the United States, even when the arrest occurs in the highly controlled setting of a cardiac catheterization lab, a new study indicates.

Among 4,787 patients who arrested in the cath lab at 231 hospitals in the Get With The Guidelines (GWTG) Resuscitation registry, only about one-third survived to discharge. The median risk-adjusted survival rate (RASR) for all hospitals was 36%.

When stratified by RASR tertiles, however, median survival rates were 20%, 36%, and 52% for hospitals in the lowest, middle, and highest tertiles.

The odds of survival differed by 71% in similar patients presenting at two randomly selected hospitals (median odds ratio, 1.71; 95% confidence interval, 1.52-1.87).

“The good news is that cardiac arrests in the cath lab are relatively infrequent, but the bad news is that they still occur and the outcomes are, in general, pretty dismal,” senior author Deepak L. Bhatt, MD, MPH, said in an interview. “So anything that we can do as hospitals [and] health care systems to improve the care of these patients could go a long way.”

Hospital and patient factors

Possible explanations for the wide disparity in survival are the small number of cardiac arrests in the cath lab, the increasing complexity of cases, and the fact that patients are often very sick and may experience a problem during a procedure, or both, Dr. Bhatt suggested. Cath labs also vary in how they handle resuscitative efforts and access to advanced mechanical support devices, such as extracorporeal membrane oxygenation (ECMO).

“It’s not available in every cath lab and, even in hospitals that have it, they may not have a given ECMO circuit available at the exact time the patient’s having a cardiac arrest,” he said. “That’s one example of something that can make, in my opinion, a big difference in whether a patient lives or dies if they’re having a cardiac arrest but may not always be easily deployed.”

When the investigators looked specifically at hospital-level factors, only yearly volume of cardiac arrests in the cath lab was significantly associated with risk-adjusted survival (P < .01), whereas hospital size, rural or urban setting, teaching status, and geographic location were not.

In multivariate adjusted analyses, factors associated with survival to discharge included age (OR, 0.78), Black race (OR, 0.68), respiratory insufficiency (OR, 0.75), and initial cardiac arrest rhythm (OR, 3.32).

The median hospital RASR was 27% higher for ventricular tachycardia or ventricular fibrillation arrests than for arrests with a nonshockable rhythm of asystole and pulseless electrical activity (55% vs. 28%).

Notably, hospitals in the lowest tertile of risk-adjusted survival rates had a higher prevalence of non-White patients, renal and respiratory comorbidity, and arrest with nonshockable rhythm.

“We want to make sure as we’re contemplating whether to resuscitate a patient or how aggressively to resuscitate, that we aren’t letting any of our own biases, whether they have to do with race or potentially sex and gender, interfere with more objective assessments of whether the patient can in fact be saved or not,” Dr. Bhatt said.

Reached for comment, Srihari S. Naidu, MD, who chaired the writing group for the Society for Cardiovascular Angiography and Interventions’ (SCAI) consensus statement on cardiogenic shock and co-authored its document on best practices in the cardiac cath lab, said the findings show that survival in the cath lab is higher than that seen in-hospital. “Still, there’s a lot of room for improvement,” he said.

He was particularly struck by the variability in survival. “Underprivileged individuals, so those who are non-White populations and have respiratory and renal problems, they seem to have a worse survival and that makes sense – patients with comorbidities – but it feeds into the issue of, ‘Are we treating our population similarly in terms of their baseline race and ethnicity as a gap in care?’ ”

Better survival at hospitals with high volumes likely reflects more experience in handling these events, a rapid response and personnel to help with resuscitation, and overall better critical care and cath lab environment, said Dr. Naidu, director of the cardiac cath lab at Westchester Medical Center and professor of medicine at New York Medical College, both in Valhalla, N.Y.

“So that leads into two things,” he said. “One is that probably we should be working on having all high-risk patients go to centers of excellence. So, for example, [for] patients in shock, patients with STEMI, regionalization of care to the high-volume cath labs that are experienced in cardiac arrest and critical care management may be a way to go.”

“Second, if experience counts, can that experience be simulated through drills and simulations in the cath lab?” Dr. Naidu said. “Should all cath labs have drills where we have a cardiac arrest patient, and how would we respond to that? Who’s going to do the compressions? Where’s the mechanical support device? What are the things we need to have a seamless cardiac arrest protocol for arrests during the cath lab?”

Dr. Bhatt and colleagues acknowledge that despite adjustment for many key variables, the study lacked procedural details that may affect survival and information related to resuscitation efforts.

“We really do need to focus more research efforts, potentially more in the way of quality-improvement efforts, to try and help patients get these sorts of patients who are in dire straits to the cath lab but hopefully also through the hospital discharge and back home,” Dr. Bhatt said.

In an editorial accompanying the study, Matthew L. Tomey, MD, Icahn School of Medicine at Mount Sinai, New York, writes that the “findings and limitations of this study together sound a call to action.”

He also signaled the need for more research and for registries and reporting instruments to capture variables particular to in-laboratory cardiac arrest and resuscitation in the cardiac cath lab. “A necessary first step is the development of consensus data elements for supplemental reporting in cases of ILCA,” such as indication for cath lab presentation, timing of arrest relative to procedure, and cause of arrest.

Dr. Bhatt reported numerous relationships with industry. Dr. Naidu and Dr. Tomey report having no relevant financial relationships.

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

The chance of surviving a cardiac arrest varies widely across hospitals in the United States, even when the arrest occurs in the highly controlled setting of a cardiac catheterization lab, a new study indicates.

Among 4,787 patients who arrested in the cath lab at 231 hospitals in the Get With The Guidelines (GWTG) Resuscitation registry, only about one-third survived to discharge. The median risk-adjusted survival rate (RASR) for all hospitals was 36%.

When stratified by RASR tertiles, however, median survival rates were 20%, 36%, and 52% for hospitals in the lowest, middle, and highest tertiles.

The odds of survival differed by 71% in similar patients presenting at two randomly selected hospitals (median odds ratio, 1.71; 95% confidence interval, 1.52-1.87).

“The good news is that cardiac arrests in the cath lab are relatively infrequent, but the bad news is that they still occur and the outcomes are, in general, pretty dismal,” senior author Deepak L. Bhatt, MD, MPH, said in an interview. “So anything that we can do as hospitals [and] health care systems to improve the care of these patients could go a long way.”

Hospital and patient factors

Possible explanations for the wide disparity in survival are the small number of cardiac arrests in the cath lab, the increasing complexity of cases, and the fact that patients are often very sick and may experience a problem during a procedure, or both, Dr. Bhatt suggested. Cath labs also vary in how they handle resuscitative efforts and access to advanced mechanical support devices, such as extracorporeal membrane oxygenation (ECMO).

“It’s not available in every cath lab and, even in hospitals that have it, they may not have a given ECMO circuit available at the exact time the patient’s having a cardiac arrest,” he said. “That’s one example of something that can make, in my opinion, a big difference in whether a patient lives or dies if they’re having a cardiac arrest but may not always be easily deployed.”

When the investigators looked specifically at hospital-level factors, only yearly volume of cardiac arrests in the cath lab was significantly associated with risk-adjusted survival (P < .01), whereas hospital size, rural or urban setting, teaching status, and geographic location were not.

In multivariate adjusted analyses, factors associated with survival to discharge included age (OR, 0.78), Black race (OR, 0.68), respiratory insufficiency (OR, 0.75), and initial cardiac arrest rhythm (OR, 3.32).

The median hospital RASR was 27% higher for ventricular tachycardia or ventricular fibrillation arrests than for arrests with a nonshockable rhythm of asystole and pulseless electrical activity (55% vs. 28%).

Notably, hospitals in the lowest tertile of risk-adjusted survival rates had a higher prevalence of non-White patients, renal and respiratory comorbidity, and arrest with nonshockable rhythm.

“We want to make sure as we’re contemplating whether to resuscitate a patient or how aggressively to resuscitate, that we aren’t letting any of our own biases, whether they have to do with race or potentially sex and gender, interfere with more objective assessments of whether the patient can in fact be saved or not,” Dr. Bhatt said.

Reached for comment, Srihari S. Naidu, MD, who chaired the writing group for the Society for Cardiovascular Angiography and Interventions’ (SCAI) consensus statement on cardiogenic shock and co-authored its document on best practices in the cardiac cath lab, said the findings show that survival in the cath lab is higher than that seen in-hospital. “Still, there’s a lot of room for improvement,” he said.

He was particularly struck by the variability in survival. “Underprivileged individuals, so those who are non-White populations and have respiratory and renal problems, they seem to have a worse survival and that makes sense – patients with comorbidities – but it feeds into the issue of, ‘Are we treating our population similarly in terms of their baseline race and ethnicity as a gap in care?’ ”

Better survival at hospitals with high volumes likely reflects more experience in handling these events, a rapid response and personnel to help with resuscitation, and overall better critical care and cath lab environment, said Dr. Naidu, director of the cardiac cath lab at Westchester Medical Center and professor of medicine at New York Medical College, both in Valhalla, N.Y.

“So that leads into two things,” he said. “One is that probably we should be working on having all high-risk patients go to centers of excellence. So, for example, [for] patients in shock, patients with STEMI, regionalization of care to the high-volume cath labs that are experienced in cardiac arrest and critical care management may be a way to go.”

“Second, if experience counts, can that experience be simulated through drills and simulations in the cath lab?” Dr. Naidu said. “Should all cath labs have drills where we have a cardiac arrest patient, and how would we respond to that? Who’s going to do the compressions? Where’s the mechanical support device? What are the things we need to have a seamless cardiac arrest protocol for arrests during the cath lab?”

Dr. Bhatt and colleagues acknowledge that despite adjustment for many key variables, the study lacked procedural details that may affect survival and information related to resuscitation efforts.

“We really do need to focus more research efforts, potentially more in the way of quality-improvement efforts, to try and help patients get these sorts of patients who are in dire straits to the cath lab but hopefully also through the hospital discharge and back home,” Dr. Bhatt said.

In an editorial accompanying the study, Matthew L. Tomey, MD, Icahn School of Medicine at Mount Sinai, New York, writes that the “findings and limitations of this study together sound a call to action.”

He also signaled the need for more research and for registries and reporting instruments to capture variables particular to in-laboratory cardiac arrest and resuscitation in the cardiac cath lab. “A necessary first step is the development of consensus data elements for supplemental reporting in cases of ILCA,” such as indication for cath lab presentation, timing of arrest relative to procedure, and cause of arrest.

Dr. Bhatt reported numerous relationships with industry. Dr. Naidu and Dr. Tomey report having no relevant financial relationships.

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

Dispatching trained volunteer responders via smartphones to retrieve automated external defibrillators for patients in out-of-hospital cardiac arrest (OHCA) did not significantly increase bystander AED use in a randomized clinical trial in Sweden.

Most patients in OHCA can be saved if cardiopulmonary resuscitation and defibrillation are initiated within minutes, but despite the “substantial” public availability of AEDs and widespread CPR training among the Swedish public, use rates of both are low, Mattias Ringh, MD, PhD, of Karolinska Institutet in Stockholm, and colleagues wrote.

A previous study by the team showed that dispatching volunteer responders via a smartphone app significantly increased bystander CPR. The current study, called the Swedish AED and Mobile Bystander Activation (SAMBA) trial, aimed to see whether dispatching volunteer responders to collect a nearby AED would increase bystander AED use. A control group of volunteer responders was instructed to go straight to the scene and start CPR.

“The results showed that the volunteer responders were first to provide treatment with both CPR and AEDs in a large proportion of cases in both groups, thereby creating a ‘statistical’ dilutional effect,” Dr. Ringh said in an interview. In effect, the control arm also became an active arm.

“But if we agree that treatment with AEDs and CPR is saving lives, then dispatching volunteer responders is doing just that, although we could not fully measure the effect in our study,” he added.

The study was published online in JAMA Cardiology.
 

No significant differences

The SAMBA trial assessed outcomes of the smartphone dispatch system (Heartrunner), which is triggered at emergency dispatch centers in response to suspected OHCAs at the same time that an ambulance with advanced life support equipment is dispatched.

The volunteer responder system locates a maximum of 30 volunteer responders within a 1.3-km radius from the suspected out-of-hospital cardiac arrest, the researchers explained in their report. Volunteer responders are requested via their smartphone application to accept or decline the alert. If they accept an alert, the volunteer responders receive map-aided route directions to the location of the suspected arrest.

In patients allocated to intervention in this study, four of five of all volunteer responders who accepted the alert received instructions to collect the nearest available AED and then go directly to the patient with suspected out-of-hospital cardiac arrest, the authors noted. Route directions to the scene of the cardiac arrest and the AED were displayed on their smartphones. One of the 5 volunteer responders, closest to the arrest, was dispatched to go directly to initiate CPR.

In patients allocated to the control group, all volunteer responders who accepted the alert were instructed to go directly to the patient with suspected out-of-hospital cardiac arrest to perform CPR. No route directions to or locations of AEDs were displayed.

The study was conducted in Stockholm and in Västra Götaland from 2018 to 2020. At the start of the study, there were 3,123 AEDs and 24,493 volunteer responders in Stockholm and 3,195 AEDs and 19,117 volunteer responders in Västra Götaland.

Post-randomization exclusions included patients without OHCA, those with OHCAs not treated by emergency medical services, and those with OHCAs witnessed by EMS.

The primary outcome was overall bystander AED attachment before the arrival of EMS, including those attached by the volunteer responders but also by lay volunteers who did not use the smartphone app.

Volunteer responders were activated for 947 individuals with OHCA; 461 patients were randomized to the intervention group and 486 to the control group. In both groups, the patients’ median age was 73 and about 65% were men.

Attachment of the AED before the arrival of EMS or first responders occurred in 61 patients (13.2%) in the intervention group versus 46 (9.5%) in the control group (P = .08). However, the majority of all AEDs were attached by lay volunteers who were not volunteer responders using the smartphone app (37 in the intervention arm vs. 28 in the control arm), the researchers noted.

No significant differences were seen in secondary outcomes, which included bystander CPR (69% vs. 71.6%, respectively) and defibrillation before EMS arrival (3.7% vs. 3.9%) between groups.

Among the volunteer responders using the app, crossover was 11% and compliance to instructions was 31%. Overall, volunteer responders attached 38% of all bystander-attached AEDs and provided 45% of all bystander defibrillations and 43% of all bystander CPR.

Going forward, Dr. Ringh and colleagues will be further analyzing the results to understand how to better optimize the logistical challenges involved with smartphone dispatch to OHCA patients. “In the longer term, investigating the impact on survival is also warranted,” he concluded.
 

U.S. in worse shape

In a comment, Christopher Calandrella, DO, chair of emergency medicine at Long Island Jewish Forest Hills,, New York, part of Northwell Health, said: “Significant data are available to support the importance of prompt initiation of CPR and defibrillation for OHCA, and although this study did not demonstrate a meaningful increase in use of AEDs with the trial system, layperson CPR was initiated in approximately 70% of cases in the cohort as a whole. Because of this, I believe it is evident that patients still benefit from a system that encourages bystanders to provide aid prior to the arrival of EMS.”

Nevertheless, he noted, “despite the training of volunteers in applying an AED, overall, only a small percentage of patients in either group had placement and use of the device. While the reasons likely are multifactorial, it may be in part due to the significant stress and anxiety associated with OHCA.”

Additional research would be helpful, he said. “Future studies focusing on more rural areas with lower population density and limited availability of AEDs may be beneficial. Expanding the research outside of Europe to other countries would be useful. Next-phase trials looking at 30-day survival in these patients would also be important.”

Currently in the United States, research is underway to evaluate the use of smartphones to improve in-hospital cardiac arrests, he added, “but no nationwide programs are in place for OHCA.”

Similarly, Kevin G. Volpp, MD, PhD, and Benjamin S. Abella, MD, MPhil, both of the University of Pennsylvania, Philadelphia, wrote in a related editorial: “It is sobering to recognize that, in the U.S., it may be nearly impossible to even test an idea like this, given the lack of a supporting data infrastructure.”

Although there is an app in the United States to link OHCA events to bystander response, they noted, less than half of eligible 911 centers have linked to it.

“Furthermore, the bystander CPR rate in the U.S. is less than 35%, only about half of the Swedish rate, indicating far fewer people are trained in CPR and comfortable performing it in the U.S.,” they wrote. “A wealthy country like the U.S. should be able to develop a far more effective approach to preventing millions of ... families from having a loved one die of OHCA in the decade to come.”

The study was funded by unrestricted grant from the Swedish Heart-Lung Foundation and Stockholm County. The authors, editorialists, and Dr. Calandrella disclosed no relevant financial relationships.

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

Dispatching trained volunteer responders via smartphones to retrieve automated external defibrillators for patients in out-of-hospital cardiac arrest (OHCA) did not significantly increase bystander AED use in a randomized clinical trial in Sweden.

Most patients in OHCA can be saved if cardiopulmonary resuscitation and defibrillation are initiated within minutes, but despite the “substantial” public availability of AEDs and widespread CPR training among the Swedish public, use rates of both are low, Mattias Ringh, MD, PhD, of Karolinska Institutet in Stockholm, and colleagues wrote.

A previous study by the team showed that dispatching volunteer responders via a smartphone app significantly increased bystander CPR. The current study, called the Swedish AED and Mobile Bystander Activation (SAMBA) trial, aimed to see whether dispatching volunteer responders to collect a nearby AED would increase bystander AED use. A control group of volunteer responders was instructed to go straight to the scene and start CPR.

“The results showed that the volunteer responders were first to provide treatment with both CPR and AEDs in a large proportion of cases in both groups, thereby creating a ‘statistical’ dilutional effect,” Dr. Ringh said in an interview. In effect, the control arm also became an active arm.

“But if we agree that treatment with AEDs and CPR is saving lives, then dispatching volunteer responders is doing just that, although we could not fully measure the effect in our study,” he added.

The study was published online in JAMA Cardiology.
 

No significant differences

The SAMBA trial assessed outcomes of the smartphone dispatch system (Heartrunner), which is triggered at emergency dispatch centers in response to suspected OHCAs at the same time that an ambulance with advanced life support equipment is dispatched.

The volunteer responder system locates a maximum of 30 volunteer responders within a 1.3-km radius from the suspected out-of-hospital cardiac arrest, the researchers explained in their report. Volunteer responders are requested via their smartphone application to accept or decline the alert. If they accept an alert, the volunteer responders receive map-aided route directions to the location of the suspected arrest.

In patients allocated to intervention in this study, four of five of all volunteer responders who accepted the alert received instructions to collect the nearest available AED and then go directly to the patient with suspected out-of-hospital cardiac arrest, the authors noted. Route directions to the scene of the cardiac arrest and the AED were displayed on their smartphones. One of the 5 volunteer responders, closest to the arrest, was dispatched to go directly to initiate CPR.

In patients allocated to the control group, all volunteer responders who accepted the alert were instructed to go directly to the patient with suspected out-of-hospital cardiac arrest to perform CPR. No route directions to or locations of AEDs were displayed.

The study was conducted in Stockholm and in Västra Götaland from 2018 to 2020. At the start of the study, there were 3,123 AEDs and 24,493 volunteer responders in Stockholm and 3,195 AEDs and 19,117 volunteer responders in Västra Götaland.

Post-randomization exclusions included patients without OHCA, those with OHCAs not treated by emergency medical services, and those with OHCAs witnessed by EMS.

The primary outcome was overall bystander AED attachment before the arrival of EMS, including those attached by the volunteer responders but also by lay volunteers who did not use the smartphone app.

Volunteer responders were activated for 947 individuals with OHCA; 461 patients were randomized to the intervention group and 486 to the control group. In both groups, the patients’ median age was 73 and about 65% were men.

Attachment of the AED before the arrival of EMS or first responders occurred in 61 patients (13.2%) in the intervention group versus 46 (9.5%) in the control group (P = .08). However, the majority of all AEDs were attached by lay volunteers who were not volunteer responders using the smartphone app (37 in the intervention arm vs. 28 in the control arm), the researchers noted.

No significant differences were seen in secondary outcomes, which included bystander CPR (69% vs. 71.6%, respectively) and defibrillation before EMS arrival (3.7% vs. 3.9%) between groups.

Among the volunteer responders using the app, crossover was 11% and compliance to instructions was 31%. Overall, volunteer responders attached 38% of all bystander-attached AEDs and provided 45% of all bystander defibrillations and 43% of all bystander CPR.

Going forward, Dr. Ringh and colleagues will be further analyzing the results to understand how to better optimize the logistical challenges involved with smartphone dispatch to OHCA patients. “In the longer term, investigating the impact on survival is also warranted,” he concluded.
 

U.S. in worse shape

In a comment, Christopher Calandrella, DO, chair of emergency medicine at Long Island Jewish Forest Hills,, New York, part of Northwell Health, said: “Significant data are available to support the importance of prompt initiation of CPR and defibrillation for OHCA, and although this study did not demonstrate a meaningful increase in use of AEDs with the trial system, layperson CPR was initiated in approximately 70% of cases in the cohort as a whole. Because of this, I believe it is evident that patients still benefit from a system that encourages bystanders to provide aid prior to the arrival of EMS.”

Nevertheless, he noted, “despite the training of volunteers in applying an AED, overall, only a small percentage of patients in either group had placement and use of the device. While the reasons likely are multifactorial, it may be in part due to the significant stress and anxiety associated with OHCA.”

Additional research would be helpful, he said. “Future studies focusing on more rural areas with lower population density and limited availability of AEDs may be beneficial. Expanding the research outside of Europe to other countries would be useful. Next-phase trials looking at 30-day survival in these patients would also be important.”

Currently in the United States, research is underway to evaluate the use of smartphones to improve in-hospital cardiac arrests, he added, “but no nationwide programs are in place for OHCA.”

Similarly, Kevin G. Volpp, MD, PhD, and Benjamin S. Abella, MD, MPhil, both of the University of Pennsylvania, Philadelphia, wrote in a related editorial: “It is sobering to recognize that, in the U.S., it may be nearly impossible to even test an idea like this, given the lack of a supporting data infrastructure.”

Although there is an app in the United States to link OHCA events to bystander response, they noted, less than half of eligible 911 centers have linked to it.

“Furthermore, the bystander CPR rate in the U.S. is less than 35%, only about half of the Swedish rate, indicating far fewer people are trained in CPR and comfortable performing it in the U.S.,” they wrote. “A wealthy country like the U.S. should be able to develop a far more effective approach to preventing millions of ... families from having a loved one die of OHCA in the decade to come.”

The study was funded by unrestricted grant from the Swedish Heart-Lung Foundation and Stockholm County. The authors, editorialists, and Dr. Calandrella disclosed no relevant financial relationships.

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

Dispatching trained volunteer responders via smartphones to retrieve automated external defibrillators for patients in out-of-hospital cardiac arrest (OHCA) did not significantly increase bystander AED use in a randomized clinical trial in Sweden.

Most patients in OHCA can be saved if cardiopulmonary resuscitation and defibrillation are initiated within minutes, but despite the “substantial” public availability of AEDs and widespread CPR training among the Swedish public, use rates of both are low, Mattias Ringh, MD, PhD, of Karolinska Institutet in Stockholm, and colleagues wrote.

A previous study by the team showed that dispatching volunteer responders via a smartphone app significantly increased bystander CPR. The current study, called the Swedish AED and Mobile Bystander Activation (SAMBA) trial, aimed to see whether dispatching volunteer responders to collect a nearby AED would increase bystander AED use. A control group of volunteer responders was instructed to go straight to the scene and start CPR.

“The results showed that the volunteer responders were first to provide treatment with both CPR and AEDs in a large proportion of cases in both groups, thereby creating a ‘statistical’ dilutional effect,” Dr. Ringh said in an interview. In effect, the control arm also became an active arm.

“But if we agree that treatment with AEDs and CPR is saving lives, then dispatching volunteer responders is doing just that, although we could not fully measure the effect in our study,” he added.

The study was published online in JAMA Cardiology.
 

No significant differences

The SAMBA trial assessed outcomes of the smartphone dispatch system (Heartrunner), which is triggered at emergency dispatch centers in response to suspected OHCAs at the same time that an ambulance with advanced life support equipment is dispatched.

The volunteer responder system locates a maximum of 30 volunteer responders within a 1.3-km radius from the suspected out-of-hospital cardiac arrest, the researchers explained in their report. Volunteer responders are requested via their smartphone application to accept or decline the alert. If they accept an alert, the volunteer responders receive map-aided route directions to the location of the suspected arrest.

In patients allocated to intervention in this study, four of five of all volunteer responders who accepted the alert received instructions to collect the nearest available AED and then go directly to the patient with suspected out-of-hospital cardiac arrest, the authors noted. Route directions to the scene of the cardiac arrest and the AED were displayed on their smartphones. One of the 5 volunteer responders, closest to the arrest, was dispatched to go directly to initiate CPR.

In patients allocated to the control group, all volunteer responders who accepted the alert were instructed to go directly to the patient with suspected out-of-hospital cardiac arrest to perform CPR. No route directions to or locations of AEDs were displayed.

The study was conducted in Stockholm and in Västra Götaland from 2018 to 2020. At the start of the study, there were 3,123 AEDs and 24,493 volunteer responders in Stockholm and 3,195 AEDs and 19,117 volunteer responders in Västra Götaland.

Post-randomization exclusions included patients without OHCA, those with OHCAs not treated by emergency medical services, and those with OHCAs witnessed by EMS.

The primary outcome was overall bystander AED attachment before the arrival of EMS, including those attached by the volunteer responders but also by lay volunteers who did not use the smartphone app.

Volunteer responders were activated for 947 individuals with OHCA; 461 patients were randomized to the intervention group and 486 to the control group. In both groups, the patients’ median age was 73 and about 65% were men.

Attachment of the AED before the arrival of EMS or first responders occurred in 61 patients (13.2%) in the intervention group versus 46 (9.5%) in the control group (P = .08). However, the majority of all AEDs were attached by lay volunteers who were not volunteer responders using the smartphone app (37 in the intervention arm vs. 28 in the control arm), the researchers noted.

No significant differences were seen in secondary outcomes, which included bystander CPR (69% vs. 71.6%, respectively) and defibrillation before EMS arrival (3.7% vs. 3.9%) between groups.

Among the volunteer responders using the app, crossover was 11% and compliance to instructions was 31%. Overall, volunteer responders attached 38% of all bystander-attached AEDs and provided 45% of all bystander defibrillations and 43% of all bystander CPR.

Going forward, Dr. Ringh and colleagues will be further analyzing the results to understand how to better optimize the logistical challenges involved with smartphone dispatch to OHCA patients. “In the longer term, investigating the impact on survival is also warranted,” he concluded.
 

U.S. in worse shape

In a comment, Christopher Calandrella, DO, chair of emergency medicine at Long Island Jewish Forest Hills,, New York, part of Northwell Health, said: “Significant data are available to support the importance of prompt initiation of CPR and defibrillation for OHCA, and although this study did not demonstrate a meaningful increase in use of AEDs with the trial system, layperson CPR was initiated in approximately 70% of cases in the cohort as a whole. Because of this, I believe it is evident that patients still benefit from a system that encourages bystanders to provide aid prior to the arrival of EMS.”

Nevertheless, he noted, “despite the training of volunteers in applying an AED, overall, only a small percentage of patients in either group had placement and use of the device. While the reasons likely are multifactorial, it may be in part due to the significant stress and anxiety associated with OHCA.”

Additional research would be helpful, he said. “Future studies focusing on more rural areas with lower population density and limited availability of AEDs may be beneficial. Expanding the research outside of Europe to other countries would be useful. Next-phase trials looking at 30-day survival in these patients would also be important.”

Currently in the United States, research is underway to evaluate the use of smartphones to improve in-hospital cardiac arrests, he added, “but no nationwide programs are in place for OHCA.”

Similarly, Kevin G. Volpp, MD, PhD, and Benjamin S. Abella, MD, MPhil, both of the University of Pennsylvania, Philadelphia, wrote in a related editorial: “It is sobering to recognize that, in the U.S., it may be nearly impossible to even test an idea like this, given the lack of a supporting data infrastructure.”

Although there is an app in the United States to link OHCA events to bystander response, they noted, less than half of eligible 911 centers have linked to it.

“Furthermore, the bystander CPR rate in the U.S. is less than 35%, only about half of the Swedish rate, indicating far fewer people are trained in CPR and comfortable performing it in the U.S.,” they wrote. “A wealthy country like the U.S. should be able to develop a far more effective approach to preventing millions of ... families from having a loved one die of OHCA in the decade to come.”

The study was funded by unrestricted grant from the Swedish Heart-Lung Foundation and Stockholm County. The authors, editorialists, and Dr. Calandrella disclosed no relevant financial relationships.

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

CHICAGO – Extended follow-up of patients with heart failure enrolled in the RAFT trial strengthens the case for starting treatment early with a cardiac resynchronization therapy plus defibrillation (CRT-D) device in appropriate patients.

RAFT, which compared CRT-D with treatment with an implantable cardioverter defibrillator (ICD) alone, showed that the early survival benefit produced by CRT-D during an average 40-month follow-up in the original trial persisted during an additional mean follow-up of about 5 years. This result strengthens the case for starting treatment early with a CRT-D device in appropriate patients with heart failure.

Mitchel L. Zoler/MDedge News

During extended follow-up of more than half of the enrolled patients, out to an average of 7.6 years overall and to an average of 12.9 years among survivors, patients who received a CRT-D device had a significant 21% relative reduction in their rate of all-cause mortality compared with randomized patients who received an ICD and no cardiac resynchronization, John L. Sapp, MD, reported at the American Heart Association scientific sessions.

The primary results of RAFT were first reported in 2010.

This magnitude of a survival benefit among the patients originally randomized to CRT is “dramatic,” given that many of the comparator patients who initially received no CRT likely crossed over to receive a CRT-D device once the initial, randomized 4 years of the study finished, commented Lynne W. Stevenson, MD, director of cardiomyopathy and the Lisa M. Jacobson Professor of Cardiology at Vanderbilt University Medical Center in Nashville, Tenn., who was not involved with the study.

‘CRT can remap heart failure trajectory’

The new findings “strengthen our conviction that CRT can remap the trajectory” of selected patients with heart failure, and that “candidates for CRT should be vigorously identified,” Dr. Stevenson said in an interview.

She also noted that the benefit with extended follow-up was “strikingly parallel” to that seen at 12 years after the addition of an ACE inhibitor for mild heart failure during the 4 years of the landmark SOLVD trial. The new RAFT extended follow-up, as well as the 12-year follow-up of the SOLVD trial, “support the concept that longer follow-up reveals vital information not provided by the relatively short randomized trial period,” she said.

“The new data say ‘don’t delay starting CRT in appropriate patients with heart failure,’ and ‘don’t think of CRT as just a treatment that makes patients feel better.’

 

“The totality of these data shows that CRT also treats the underlying heart muscle weakness, which helps patients live longer. Previous data showed that patients with left bundle branch block eligible for CRT are unlikely to respond well to the usual, recommended heart medications so it is important to start treatment with CRT-D early,” declared Dr. Stevenson, who cochaired the session where Dr. Sapp gave his report.

RAFT randomized 1,798 patients with New York Heart Association (NYHA) class II or III heart failure, a left ventricular ejection fraction of 30% or less, and an intrinsic QRS duration of at least 120 msec to receive either a CRT-D or ICD device. The study’s primary endpoint was death from any cause or hospitalization for heart failure. After an average 40 months of randomized follow-up, the primary endpoint occurred in 40% of the patients with an ICD and in 33% of those with a CRT-D device, a significant 25% relative reduction linked with CRT-D use. Both endpoint components contributed to the combined result significantly and to about the same extent, and the incremental benefit from CRT-D was significant for patients with NYHA class II heart failure as well as for those with class III.

However, prespecified subgroup analyses showed that the incremental benefit from CRT-D was significantly limited to patients with an intrinsic QRS duration of at least 150 msec, while in those with a duration of 120-149 msec CRT-D had a neutral effect compared with ICD. The same pattern also appeared when the analysis split patients into those with a left bundle branch block, who significantly benefited from CRT-D, but the initial benefit was not apparent in patients with right bundle branch block.

A study subgroup with extended follow-up

The new, extended follow-up analysis presented by Dr. Sapp included 1,050 of the original 1,798 patients (58%) enrolled at any of eight participating Canadian centers that each enrolled at least 100 patients and followed them through the end of 2021 (the full study cohort came from 34 centers, including 10 centers outside Canada). This subgroup included 520 patients randomized to receive CRT-D and 530 who received an ICD. Although this was a post hoc subgroup analysis, the CRT-D and ICD arms matched closely in all measured baseline characteristics.

The prespecified primary outcome of this follow-up analysis was the rate of all-cause mortality. Because of their longer disease trajectory, this pared-down study cohort included many more patients with NYHA class II function, 803, and in this subgroup CRT-D exerted a significant 23% incremental reduction in mortality compared with ICD treatment. CRT-D also produced a 17% relative reduction in long-term mortality among patients with NYHA class III function at baseline, but this point estimate of relative benefit was not significant in this subgroup of just 247 patients, said Dr. Sapp, a cardiologist and professor at Dalhousie University & Nova Scotia Health in Halifax.

Based on the original RAFT results from 2010, as well as on evidence from several other trials, the current heart failure management guideline from the AHA, the American College of Cardiology, and the Heart Failure Society of America give the highest level of recommendation, level 1, for CRT in patients with a left ventricular ejection fraction of 35% or less, sinus rhythm with left bundle branch block, a QRS duration of at least 150 msec, and NYHA class II, III, or ambulatory IV symptoms while on guideline-directed medical therapy.

The guideline also gives class 2a (“can be useful”) or 2b (“may be considered”) recommendation for certain other heart failure patients, including those with a QRS duration of 120-149 msec, a left ventricular ejection fraction as high as 50%, no left bundle branch block, or NYHA class I symptoms.

Don’t wait to start CRT

Although this 2022 guideline, as well as earlier versions that had roughly similar recommendations for CRT for about a decade, have led to “common” use of CRT in appropriate patients in U.S. practice, “it has not been used as much as it should be, in part because there’s been a feeling that CRT mostly treats symptoms and so perhaps you can wait” to start it, said Dr. Stevenson.

The findings from the new, extended follow-up RAFT analysis give increased urgency to starting CRT “as soon as possible” in appropriate patients with heart failure, even before they stabilize on guideline-directed medical therapy, said Dr. Stevenson. She also downplayed any ambiguity in the RAFT findings about optimal medical therapy, which during the RAFT study included traditional triple therapy at a time before treatment with sacubitril/valsartan (Entresto) and sodium-glucose cotransporter 2 (SGLT2) inhibitors became recommended.

“There is no reason to think that these treatments will negate the benefit of CRT for patients with heart failure with reduced ejection fraction and a wide left bundle branch block,” Dr. Stevenson said.

She also believes that the extended follow-up results, which showed clear efficacy for CRT-D in patients with NYHA class II function, support the case for upgrading the current 2b recommendation for using CRT treatment in patients with NYHA class I function and ischemic heart failure to a 2a recommendation regardless of whether or not patients have coronary artery disease. “The difference between class I and class II depends more on a patient’s lifestyle rather than on the severity of their heart failure,” Dr. Stevenson noted. “The RAFT study results encourage us to reexamine the clinical class and timing for CRT” in the current heart failure guideline.

RAFT received partial sponsorship from Medtronic. Dr. Sapp has been a consultant to Abbott, Biosense Webster, Medtronic, and Varian and has received research funding from Abbott and Biosense Webster. Dr. Stevenson had no disclosures.

CHICAGO – Extended follow-up of patients with heart failure enrolled in the RAFT trial strengthens the case for starting treatment early with a cardiac resynchronization therapy plus defibrillation (CRT-D) device in appropriate patients.

RAFT, which compared CRT-D with treatment with an implantable cardioverter defibrillator (ICD) alone, showed that the early survival benefit produced by CRT-D during an average 40-month follow-up in the original trial persisted during an additional mean follow-up of about 5 years. This result strengthens the case for starting treatment early with a CRT-D device in appropriate patients with heart failure.

Mitchel L. Zoler/MDedge News

During extended follow-up of more than half of the enrolled patients, out to an average of 7.6 years overall and to an average of 12.9 years among survivors, patients who received a CRT-D device had a significant 21% relative reduction in their rate of all-cause mortality compared with randomized patients who received an ICD and no cardiac resynchronization, John L. Sapp, MD, reported at the American Heart Association scientific sessions.

The primary results of RAFT were first reported in 2010.

This magnitude of a survival benefit among the patients originally randomized to CRT is “dramatic,” given that many of the comparator patients who initially received no CRT likely crossed over to receive a CRT-D device once the initial, randomized 4 years of the study finished, commented Lynne W. Stevenson, MD, director of cardiomyopathy and the Lisa M. Jacobson Professor of Cardiology at Vanderbilt University Medical Center in Nashville, Tenn., who was not involved with the study.

‘CRT can remap heart failure trajectory’

The new findings “strengthen our conviction that CRT can remap the trajectory” of selected patients with heart failure, and that “candidates for CRT should be vigorously identified,” Dr. Stevenson said in an interview.

She also noted that the benefit with extended follow-up was “strikingly parallel” to that seen at 12 years after the addition of an ACE inhibitor for mild heart failure during the 4 years of the landmark SOLVD trial. The new RAFT extended follow-up, as well as the 12-year follow-up of the SOLVD trial, “support the concept that longer follow-up reveals vital information not provided by the relatively short randomized trial period,” she said.

“The new data say ‘don’t delay starting CRT in appropriate patients with heart failure,’ and ‘don’t think of CRT as just a treatment that makes patients feel better.’

 

“The totality of these data shows that CRT also treats the underlying heart muscle weakness, which helps patients live longer. Previous data showed that patients with left bundle branch block eligible for CRT are unlikely to respond well to the usual, recommended heart medications so it is important to start treatment with CRT-D early,” declared Dr. Stevenson, who cochaired the session where Dr. Sapp gave his report.

RAFT randomized 1,798 patients with New York Heart Association (NYHA) class II or III heart failure, a left ventricular ejection fraction of 30% or less, and an intrinsic QRS duration of at least 120 msec to receive either a CRT-D or ICD device. The study’s primary endpoint was death from any cause or hospitalization for heart failure. After an average 40 months of randomized follow-up, the primary endpoint occurred in 40% of the patients with an ICD and in 33% of those with a CRT-D device, a significant 25% relative reduction linked with CRT-D use. Both endpoint components contributed to the combined result significantly and to about the same extent, and the incremental benefit from CRT-D was significant for patients with NYHA class II heart failure as well as for those with class III.

However, prespecified subgroup analyses showed that the incremental benefit from CRT-D was significantly limited to patients with an intrinsic QRS duration of at least 150 msec, while in those with a duration of 120-149 msec CRT-D had a neutral effect compared with ICD. The same pattern also appeared when the analysis split patients into those with a left bundle branch block, who significantly benefited from CRT-D, but the initial benefit was not apparent in patients with right bundle branch block.

A study subgroup with extended follow-up

The new, extended follow-up analysis presented by Dr. Sapp included 1,050 of the original 1,798 patients (58%) enrolled at any of eight participating Canadian centers that each enrolled at least 100 patients and followed them through the end of 2021 (the full study cohort came from 34 centers, including 10 centers outside Canada). This subgroup included 520 patients randomized to receive CRT-D and 530 who received an ICD. Although this was a post hoc subgroup analysis, the CRT-D and ICD arms matched closely in all measured baseline characteristics.

The prespecified primary outcome of this follow-up analysis was the rate of all-cause mortality. Because of their longer disease trajectory, this pared-down study cohort included many more patients with NYHA class II function, 803, and in this subgroup CRT-D exerted a significant 23% incremental reduction in mortality compared with ICD treatment. CRT-D also produced a 17% relative reduction in long-term mortality among patients with NYHA class III function at baseline, but this point estimate of relative benefit was not significant in this subgroup of just 247 patients, said Dr. Sapp, a cardiologist and professor at Dalhousie University & Nova Scotia Health in Halifax.

Based on the original RAFT results from 2010, as well as on evidence from several other trials, the current heart failure management guideline from the AHA, the American College of Cardiology, and the Heart Failure Society of America give the highest level of recommendation, level 1, for CRT in patients with a left ventricular ejection fraction of 35% or less, sinus rhythm with left bundle branch block, a QRS duration of at least 150 msec, and NYHA class II, III, or ambulatory IV symptoms while on guideline-directed medical therapy.

The guideline also gives class 2a (“can be useful”) or 2b (“may be considered”) recommendation for certain other heart failure patients, including those with a QRS duration of 120-149 msec, a left ventricular ejection fraction as high as 50%, no left bundle branch block, or NYHA class I symptoms.

Don’t wait to start CRT

Although this 2022 guideline, as well as earlier versions that had roughly similar recommendations for CRT for about a decade, have led to “common” use of CRT in appropriate patients in U.S. practice, “it has not been used as much as it should be, in part because there’s been a feeling that CRT mostly treats symptoms and so perhaps you can wait” to start it, said Dr. Stevenson.

The findings from the new, extended follow-up RAFT analysis give increased urgency to starting CRT “as soon as possible” in appropriate patients with heart failure, even before they stabilize on guideline-directed medical therapy, said Dr. Stevenson. She also downplayed any ambiguity in the RAFT findings about optimal medical therapy, which during the RAFT study included traditional triple therapy at a time before treatment with sacubitril/valsartan (Entresto) and sodium-glucose cotransporter 2 (SGLT2) inhibitors became recommended.

“There is no reason to think that these treatments will negate the benefit of CRT for patients with heart failure with reduced ejection fraction and a wide left bundle branch block,” Dr. Stevenson said.

She also believes that the extended follow-up results, which showed clear efficacy for CRT-D in patients with NYHA class II function, support the case for upgrading the current 2b recommendation for using CRT treatment in patients with NYHA class I function and ischemic heart failure to a 2a recommendation regardless of whether or not patients have coronary artery disease. “The difference between class I and class II depends more on a patient’s lifestyle rather than on the severity of their heart failure,” Dr. Stevenson noted. “The RAFT study results encourage us to reexamine the clinical class and timing for CRT” in the current heart failure guideline.

RAFT received partial sponsorship from Medtronic. Dr. Sapp has been a consultant to Abbott, Biosense Webster, Medtronic, and Varian and has received research funding from Abbott and Biosense Webster. Dr. Stevenson had no disclosures.

CHICAGO – Extended follow-up of patients with heart failure enrolled in the RAFT trial strengthens the case for starting treatment early with a cardiac resynchronization therapy plus defibrillation (CRT-D) device in appropriate patients.

RAFT, which compared CRT-D with treatment with an implantable cardioverter defibrillator (ICD) alone, showed that the early survival benefit produced by CRT-D during an average 40-month follow-up in the original trial persisted during an additional mean follow-up of about 5 years. This result strengthens the case for starting treatment early with a CRT-D device in appropriate patients with heart failure.

Mitchel L. Zoler/MDedge News

During extended follow-up of more than half of the enrolled patients, out to an average of 7.6 years overall and to an average of 12.9 years among survivors, patients who received a CRT-D device had a significant 21% relative reduction in their rate of all-cause mortality compared with randomized patients who received an ICD and no cardiac resynchronization, John L. Sapp, MD, reported at the American Heart Association scientific sessions.

The primary results of RAFT were first reported in 2010.

This magnitude of a survival benefit among the patients originally randomized to CRT is “dramatic,” given that many of the comparator patients who initially received no CRT likely crossed over to receive a CRT-D device once the initial, randomized 4 years of the study finished, commented Lynne W. Stevenson, MD, director of cardiomyopathy and the Lisa M. Jacobson Professor of Cardiology at Vanderbilt University Medical Center in Nashville, Tenn., who was not involved with the study.

‘CRT can remap heart failure trajectory’

The new findings “strengthen our conviction that CRT can remap the trajectory” of selected patients with heart failure, and that “candidates for CRT should be vigorously identified,” Dr. Stevenson said in an interview.

She also noted that the benefit with extended follow-up was “strikingly parallel” to that seen at 12 years after the addition of an ACE inhibitor for mild heart failure during the 4 years of the landmark SOLVD trial. The new RAFT extended follow-up, as well as the 12-year follow-up of the SOLVD trial, “support the concept that longer follow-up reveals vital information not provided by the relatively short randomized trial period,” she said.

“The new data say ‘don’t delay starting CRT in appropriate patients with heart failure,’ and ‘don’t think of CRT as just a treatment that makes patients feel better.’

 

“The totality of these data shows that CRT also treats the underlying heart muscle weakness, which helps patients live longer. Previous data showed that patients with left bundle branch block eligible for CRT are unlikely to respond well to the usual, recommended heart medications so it is important to start treatment with CRT-D early,” declared Dr. Stevenson, who cochaired the session where Dr. Sapp gave his report.

RAFT randomized 1,798 patients with New York Heart Association (NYHA) class II or III heart failure, a left ventricular ejection fraction of 30% or less, and an intrinsic QRS duration of at least 120 msec to receive either a CRT-D or ICD device. The study’s primary endpoint was death from any cause or hospitalization for heart failure. After an average 40 months of randomized follow-up, the primary endpoint occurred in 40% of the patients with an ICD and in 33% of those with a CRT-D device, a significant 25% relative reduction linked with CRT-D use. Both endpoint components contributed to the combined result significantly and to about the same extent, and the incremental benefit from CRT-D was significant for patients with NYHA class II heart failure as well as for those with class III.

However, prespecified subgroup analyses showed that the incremental benefit from CRT-D was significantly limited to patients with an intrinsic QRS duration of at least 150 msec, while in those with a duration of 120-149 msec CRT-D had a neutral effect compared with ICD. The same pattern also appeared when the analysis split patients into those with a left bundle branch block, who significantly benefited from CRT-D, but the initial benefit was not apparent in patients with right bundle branch block.

A study subgroup with extended follow-up

The new, extended follow-up analysis presented by Dr. Sapp included 1,050 of the original 1,798 patients (58%) enrolled at any of eight participating Canadian centers that each enrolled at least 100 patients and followed them through the end of 2021 (the full study cohort came from 34 centers, including 10 centers outside Canada). This subgroup included 520 patients randomized to receive CRT-D and 530 who received an ICD. Although this was a post hoc subgroup analysis, the CRT-D and ICD arms matched closely in all measured baseline characteristics.

The prespecified primary outcome of this follow-up analysis was the rate of all-cause mortality. Because of their longer disease trajectory, this pared-down study cohort included many more patients with NYHA class II function, 803, and in this subgroup CRT-D exerted a significant 23% incremental reduction in mortality compared with ICD treatment. CRT-D also produced a 17% relative reduction in long-term mortality among patients with NYHA class III function at baseline, but this point estimate of relative benefit was not significant in this subgroup of just 247 patients, said Dr. Sapp, a cardiologist and professor at Dalhousie University & Nova Scotia Health in Halifax.

Based on the original RAFT results from 2010, as well as on evidence from several other trials, the current heart failure management guideline from the AHA, the American College of Cardiology, and the Heart Failure Society of America give the highest level of recommendation, level 1, for CRT in patients with a left ventricular ejection fraction of 35% or less, sinus rhythm with left bundle branch block, a QRS duration of at least 150 msec, and NYHA class II, III, or ambulatory IV symptoms while on guideline-directed medical therapy.

The guideline also gives class 2a (“can be useful”) or 2b (“may be considered”) recommendation for certain other heart failure patients, including those with a QRS duration of 120-149 msec, a left ventricular ejection fraction as high as 50%, no left bundle branch block, or NYHA class I symptoms.

Don’t wait to start CRT

Although this 2022 guideline, as well as earlier versions that had roughly similar recommendations for CRT for about a decade, have led to “common” use of CRT in appropriate patients in U.S. practice, “it has not been used as much as it should be, in part because there’s been a feeling that CRT mostly treats symptoms and so perhaps you can wait” to start it, said Dr. Stevenson.

The findings from the new, extended follow-up RAFT analysis give increased urgency to starting CRT “as soon as possible” in appropriate patients with heart failure, even before they stabilize on guideline-directed medical therapy, said Dr. Stevenson. She also downplayed any ambiguity in the RAFT findings about optimal medical therapy, which during the RAFT study included traditional triple therapy at a time before treatment with sacubitril/valsartan (Entresto) and sodium-glucose cotransporter 2 (SGLT2) inhibitors became recommended.

“There is no reason to think that these treatments will negate the benefit of CRT for patients with heart failure with reduced ejection fraction and a wide left bundle branch block,” Dr. Stevenson said.

She also believes that the extended follow-up results, which showed clear efficacy for CRT-D in patients with NYHA class II function, support the case for upgrading the current 2b recommendation for using CRT treatment in patients with NYHA class I function and ischemic heart failure to a 2a recommendation regardless of whether or not patients have coronary artery disease. “The difference between class I and class II depends more on a patient’s lifestyle rather than on the severity of their heart failure,” Dr. Stevenson noted. “The RAFT study results encourage us to reexamine the clinical class and timing for CRT” in the current heart failure guideline.

RAFT received partial sponsorship from Medtronic. Dr. Sapp has been a consultant to Abbott, Biosense Webster, Medtronic, and Varian and has received research funding from Abbott and Biosense Webster. Dr. Stevenson had no disclosures.

The U.S. Food and Drug Administration issued a letter to health care providers describing a current shortage of Getinge intra-aortic balloon pump (IABP) catheters and other components.

Wikimedia Commons/FitzColinGerald/Creative Commons License

Earlier, the agency announced shortages of the company’s Maquet/Datascope IAB catheters, new Cardiosave IABP devices, and Cardiosave IABP parts. The new notification adds Getinge Maquet/Datascope IABP systems to the list.

The company’s letter explains that “ongoing supply chain issues have significantly impacted our ability to build intra-aortic balloon pumps, intra-aortic balloon catheters, and spare parts due to raw material shortages.”

It also offers guidance on maintaining Cardiosave Safety Disks and lithium-ion batteries in the face of the shortages. “In the event that you need a replacement pump while your IABP is undergoing service, please contact your local sales representative who may be able to assist with a temporary IABP.”

Providers are instructed to inform the company through its sales representatives “if you have any underutilized Maquet/Datascope IAB catheters or IABPs and are willing to share them with hospitals in need.”

The shortages are expected to continue into 2023, the FDA states in its letter.

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

The U.S. Food and Drug Administration issued a letter to health care providers describing a current shortage of Getinge intra-aortic balloon pump (IABP) catheters and other components.

Wikimedia Commons/FitzColinGerald/Creative Commons License

Earlier, the agency announced shortages of the company’s Maquet/Datascope IAB catheters, new Cardiosave IABP devices, and Cardiosave IABP parts. The new notification adds Getinge Maquet/Datascope IABP systems to the list.

The company’s letter explains that “ongoing supply chain issues have significantly impacted our ability to build intra-aortic balloon pumps, intra-aortic balloon catheters, and spare parts due to raw material shortages.”

It also offers guidance on maintaining Cardiosave Safety Disks and lithium-ion batteries in the face of the shortages. “In the event that you need a replacement pump while your IABP is undergoing service, please contact your local sales representative who may be able to assist with a temporary IABP.”

Providers are instructed to inform the company through its sales representatives “if you have any underutilized Maquet/Datascope IAB catheters or IABPs and are willing to share them with hospitals in need.”

The shortages are expected to continue into 2023, the FDA states in its letter.

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

The U.S. Food and Drug Administration issued a letter to health care providers describing a current shortage of Getinge intra-aortic balloon pump (IABP) catheters and other components.

Wikimedia Commons/FitzColinGerald/Creative Commons License

Earlier, the agency announced shortages of the company’s Maquet/Datascope IAB catheters, new Cardiosave IABP devices, and Cardiosave IABP parts. The new notification adds Getinge Maquet/Datascope IABP systems to the list.

The company’s letter explains that “ongoing supply chain issues have significantly impacted our ability to build intra-aortic balloon pumps, intra-aortic balloon catheters, and spare parts due to raw material shortages.”

It also offers guidance on maintaining Cardiosave Safety Disks and lithium-ion batteries in the face of the shortages. “In the event that you need a replacement pump while your IABP is undergoing service, please contact your local sales representative who may be able to assist with a temporary IABP.”

Providers are instructed to inform the company through its sales representatives “if you have any underutilized Maquet/Datascope IAB catheters or IABPs and are willing to share them with hospitals in need.”

The shortages are expected to continue into 2023, the FDA states in its letter.

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

The study covered in this summary was published on ResearchSquare.com as a preprint and has not yet been peer-reviewed.

Key takeaway

• Acute atrial fibrillation (AF) is an independent predictor of severity of neurological deficits from early acute ischemic stroke and a high-probability predictor of death within 30 days after such strokes.

Why this matters

• A comprehensive understanding of the relationship between acute AF and risk for acute ischemic stroke and prognosis will help improve management and treatment of patients with acute ischemic stroke.

Study design

• The retrospective study included patients with acute ischemic stroke within the prior 24 hours; 12-lead electrocardiogram in the emergency department; and hospitalization and treatment at the hospital stroke center.
• The cohort of 706 patients admitted to a single center in Shanghai, China, from December 2019 to December 2021, included 142 with episodes of acute AF and 564 without such episodes.
• Patients with acute ischemic stroke and acute AF – including AF of new onset, paroxysmal, persistent, or permanent with symptoms such as palpitations or dizziness attributed to rapid ventricular rates – were identified.
• Neurological deficits were assessed using the 7-day National Institutes of Health Stroke Scale/Score (NIHSS). Patients with a 7-day NIHSS score of at least 16 were considered to have moderate to severe stroke.
• Associations between acute AF onset and the severity of early neurological deficits were assessed and related to all-cause mortality within 30 days of the stroke.

Key results

• Patients with acute AF were older than those without acute AF (80.3 years vs. 71.0 years; P < .001).
• Baseline NIHSS scores averaged 16.09 for the stroke patients with acute AF and 8.65 for those without acute AF (P < .001).
• Significantly more patients with acute AF than without acute AF had a 7-day NIHSS score of at least 16 (45.1% vs. 14.4%; P < .001).
• More patients with than without acute AF underwent transcatheter thrombectomy (44.4% vs. 24.5%; P < .001) or received thrombolytic therapy (31.6% vs. 19.7%; P = .005).
• Patients aged 73 years or older showed baseline NIHSS score and acute AF as independent risk factors for early neurological deficits in stroke patients admitted to the emergency department.
• Mortality at 30 days was significantly higher in patients with acute AF than in those without acute AF (30.3% vs. 10.1%; P < .001).
• Baseline NIHSS had an adjusted odds ratio for 30-day mortality of 1.18 (95% confidence interval, 1.15-1.22; P < .001).  
• Other independent predictors included acute AF (1.87 [95% CI, 1.09-3.19; P = .022]) and age 73 or older (2.00 [95% CI, 1.18-3.37; P = .01]).

Limitations

• The study was retrospective and didn’t have access to some potentially relevant data, such as duration of AF.
• The single-center study with limited generalizability does not necessarily represent the broad population of stroke patients in China or elsewhere.

Disclosures

• This study was supported by the Cardiovascular Multidisciplinary Integrated Research Fund and Construction of Shanghai Municipal Health Commission.
• The authors report no relevant financial relationships.

This is a summary of a preprint research study, “Acute Atrial Fibrillation During Onset of Stroke Indicates Higher Probability of Post-Stroke Death Outcomes,” written by Yongxia Li, from the Shanghai Sixth People’s Hospital, and colleagues, on ResearchSquare.com. This study has not yet been peer reviewed. The full text of the study can be found on ResearchSquare.com.A version of this article first appeared on Medscape.com.

The study covered in this summary was published on ResearchSquare.com as a preprint and has not yet been peer-reviewed.

Key takeaway

• Acute atrial fibrillation (AF) is an independent predictor of severity of neurological deficits from early acute ischemic stroke and a high-probability predictor of death within 30 days after such strokes.

Why this matters

• A comprehensive understanding of the relationship between acute AF and risk for acute ischemic stroke and prognosis will help improve management and treatment of patients with acute ischemic stroke.

Study design

• The retrospective study included patients with acute ischemic stroke within the prior 24 hours; 12-lead electrocardiogram in the emergency department; and hospitalization and treatment at the hospital stroke center.
• The cohort of 706 patients admitted to a single center in Shanghai, China, from December 2019 to December 2021, included 142 with episodes of acute AF and 564 without such episodes.
• Patients with acute ischemic stroke and acute AF – including AF of new onset, paroxysmal, persistent, or permanent with symptoms such as palpitations or dizziness attributed to rapid ventricular rates – were identified.
• Neurological deficits were assessed using the 7-day National Institutes of Health Stroke Scale/Score (NIHSS). Patients with a 7-day NIHSS score of at least 16 were considered to have moderate to severe stroke.
• Associations between acute AF onset and the severity of early neurological deficits were assessed and related to all-cause mortality within 30 days of the stroke.

Key results

• Patients with acute AF were older than those without acute AF (80.3 years vs. 71.0 years; P < .001).
• Baseline NIHSS scores averaged 16.09 for the stroke patients with acute AF and 8.65 for those without acute AF (P < .001).
• Significantly more patients with acute AF than without acute AF had a 7-day NIHSS score of at least 16 (45.1% vs. 14.4%; P < .001).
• More patients with than without acute AF underwent transcatheter thrombectomy (44.4% vs. 24.5%; P < .001) or received thrombolytic therapy (31.6% vs. 19.7%; P = .005).
• Patients aged 73 years or older showed baseline NIHSS score and acute AF as independent risk factors for early neurological deficits in stroke patients admitted to the emergency department.
• Mortality at 30 days was significantly higher in patients with acute AF than in those without acute AF (30.3% vs. 10.1%; P < .001).
• Baseline NIHSS had an adjusted odds ratio for 30-day mortality of 1.18 (95% confidence interval, 1.15-1.22; P < .001).  
• Other independent predictors included acute AF (1.87 [95% CI, 1.09-3.19; P = .022]) and age 73 or older (2.00 [95% CI, 1.18-3.37; P = .01]).

Limitations

• The study was retrospective and didn’t have access to some potentially relevant data, such as duration of AF.
• The single-center study with limited generalizability does not necessarily represent the broad population of stroke patients in China or elsewhere.

Disclosures

• This study was supported by the Cardiovascular Multidisciplinary Integrated Research Fund and Construction of Shanghai Municipal Health Commission.
• The authors report no relevant financial relationships.

This is a summary of a preprint research study, “Acute Atrial Fibrillation During Onset of Stroke Indicates Higher Probability of Post-Stroke Death Outcomes,” written by Yongxia Li, from the Shanghai Sixth People’s Hospital, and colleagues, on ResearchSquare.com. This study has not yet been peer reviewed. The full text of the study can be found on ResearchSquare.com.A version of this article first appeared on Medscape.com.

The study covered in this summary was published on ResearchSquare.com as a preprint and has not yet been peer-reviewed.

Key takeaway

• Acute atrial fibrillation (AF) is an independent predictor of severity of neurological deficits from early acute ischemic stroke and a high-probability predictor of death within 30 days after such strokes.

Why this matters

• A comprehensive understanding of the relationship between acute AF and risk for acute ischemic stroke and prognosis will help improve management and treatment of patients with acute ischemic stroke.

Study design

• The retrospective study included patients with acute ischemic stroke within the prior 24 hours; 12-lead electrocardiogram in the emergency department; and hospitalization and treatment at the hospital stroke center.
• The cohort of 706 patients admitted to a single center in Shanghai, China, from December 2019 to December 2021, included 142 with episodes of acute AF and 564 without such episodes.
• Patients with acute ischemic stroke and acute AF – including AF of new onset, paroxysmal, persistent, or permanent with symptoms such as palpitations or dizziness attributed to rapid ventricular rates – were identified.
• Neurological deficits were assessed using the 7-day National Institutes of Health Stroke Scale/Score (NIHSS). Patients with a 7-day NIHSS score of at least 16 were considered to have moderate to severe stroke.
• Associations between acute AF onset and the severity of early neurological deficits were assessed and related to all-cause mortality within 30 days of the stroke.

Key results

• Patients with acute AF were older than those without acute AF (80.3 years vs. 71.0 years; P < .001).
• Baseline NIHSS scores averaged 16.09 for the stroke patients with acute AF and 8.65 for those without acute AF (P < .001).
• Significantly more patients with acute AF than without acute AF had a 7-day NIHSS score of at least 16 (45.1% vs. 14.4%; P < .001).
• More patients with than without acute AF underwent transcatheter thrombectomy (44.4% vs. 24.5%; P < .001) or received thrombolytic therapy (31.6% vs. 19.7%; P = .005).
• Patients aged 73 years or older showed baseline NIHSS score and acute AF as independent risk factors for early neurological deficits in stroke patients admitted to the emergency department.
• Mortality at 30 days was significantly higher in patients with acute AF than in those without acute AF (30.3% vs. 10.1%; P < .001).
• Baseline NIHSS had an adjusted odds ratio for 30-day mortality of 1.18 (95% confidence interval, 1.15-1.22; P < .001).  
• Other independent predictors included acute AF (1.87 [95% CI, 1.09-3.19; P = .022]) and age 73 or older (2.00 [95% CI, 1.18-3.37; P = .01]).

Limitations

• The study was retrospective and didn’t have access to some potentially relevant data, such as duration of AF.
• The single-center study with limited generalizability does not necessarily represent the broad population of stroke patients in China or elsewhere.

Disclosures

• This study was supported by the Cardiovascular Multidisciplinary Integrated Research Fund and Construction of Shanghai Municipal Health Commission.
• The authors report no relevant financial relationships.

This is a summary of a preprint research study, “Acute Atrial Fibrillation During Onset of Stroke Indicates Higher Probability of Post-Stroke Death Outcomes,” written by Yongxia Li, from the Shanghai Sixth People’s Hospital, and colleagues, on ResearchSquare.com. This study has not yet been peer reviewed. The full text of the study can be found on ResearchSquare.com.A version of this article first appeared on Medscape.com.

Electrolyte abnormalities may serve as a precursor to a future eating disorder diagnosis, a finding that may help pinpoint candidates for screening.

Researchers found that adolescents and adults with electrolyte abnormalities on routine outpatient lab work were twice as likely as those without these disturbances to be subsequently diagnosed with an eating disorder.

“These electrolyte abnormalities were in fact seen well ahead (> 1 year on average) of the time when patients were diagnosed with eating disorders,” study investigator Gregory Hundemer, MD, department of nephrology, University of Ottawa, told this news organization.

“Incidentally discovered outpatient electrolyte abnormalities may help to identify individuals who may benefit from more targeted screening into an underlying eating disorder. This, in turn, may allow for earlier diagnosis and therapeutic intervention,” Dr. Hundemer said.

The study was published online in JAMA Network Open.
 

Tailored screening?

Electrolyte abnormalities are often found when an individual is diagnosed with an eating disorder, but it’s largely unknown whether electrolyte abnormalities prior to the acute presentation of an eating disorder are associated with the future diagnosis of an eating disorder.

To investigate, the researchers used administrative health data to match 6,970 individuals (mean age, 28 years; 13% male) with an eating disorder diagnosis to 27,878 controls without an eating disorder diagnosis.

They found that individuals with an eating disorder were more likely to have a preceding electrolyte abnormality, compared with peers without an eating disorder (18.4% vs. 7.5%).

An outpatient electrolyte abnormality present 3 years to 30 days prior to diagnosis was associated with about a twofold higher odds for subsequent eating disorder diagnosis (adjusted odds ratio, 2.12; 95% confidence interval, 1.86-2.41).

The median time from the earliest electrolyte abnormality to eating disorder diagnosis was 386 days (range, 157-716 days).

Hypokalemia was the most common electrolyte abnormality (present in 12% of cases vs. 5% of controls), while hyponatremia, hypernatremia, hypophosphatemia, and metabolic alkalosis were the most specific for a subsequent eating disorder diagnosis.

Severe hypokalemia (serum potassium levels of 3.0 mmol/L or lower) and severe hyponatremia (serum sodium, 128 mmol/L or lower) were associated with over sevenfold and fivefold higher odds for the diagnosis of an eating disorder, respectively.

The U.S. Preventive Services Task Force issued its first-ever statement on screening for eating disorders earlier this year.

The task force concluded that there is insufficient evidence to weigh the balance of benefits and harms of screening for eating disorders in adolescents and adults with no signs or symptoms of an eating disorder or concerns about their eating and who have not previously been diagnosed with an eating disorder.

Dr. Hundemer and colleagues believe an incidental electrolyte abnormality may identify candidates at high risk for an underlying eating disorder who many benefit from screening.

Several screening tools of varying complexity have been developed that are validated and accurate in identifying individuals with a potential eating disorder.

They include the SCOFF questionnaire, the Eating Disorder Screen for Primary Care, the Eating Attitudes Test, and the Primary Care Evaluation of Mental Disorders Patient Health Questionnaire.
 

Underdiagnosed, undertreated

Offering perspective on the findings, Kamryn T. Eddy, PhD, codirector, Eating Disorders Clinical and Research Program, Massachusetts General Hospital, Boston, said the notion “that a physical sign may help to promote eating disorder assessment is important particularly given that early detection can improve outcomes.”

“But this finding appears in the current context of eating disorders going largely underdetected, underdiagnosed, and undertreated across medical and psychiatric settings,” said Dr. Eddy, associate professor, department of psychiatry, Harvard Medical School, Boston.

“Indeed, eating disorders are prevalent and cut across age, sex, gender, weight, race, ethnicity, and socioeconomic strata, and still, many providers do not routinely assess for eating disorders,” Dr. Eddy said.

“I might suggest that perhaps in addition to letting electrolyte abnormalities be a cue to screen for eating disorders, an even more powerful shift toward routine screening and assessment of eating disorders by medical providers be made,” Dr. Eddy said in an interview.

This study was supported by ICES, which is funded by an annual grant from the Ontario Ministry of Health and the Ministry of Health and Long-Term Care. Dr. Hundemer and Dr. Eddy have disclosed no relevant financial relationships.

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

Electrolyte abnormalities may serve as a precursor to a future eating disorder diagnosis, a finding that may help pinpoint candidates for screening.

Researchers found that adolescents and adults with electrolyte abnormalities on routine outpatient lab work were twice as likely as those without these disturbances to be subsequently diagnosed with an eating disorder.

“These electrolyte abnormalities were in fact seen well ahead (> 1 year on average) of the time when patients were diagnosed with eating disorders,” study investigator Gregory Hundemer, MD, department of nephrology, University of Ottawa, told this news organization.

“Incidentally discovered outpatient electrolyte abnormalities may help to identify individuals who may benefit from more targeted screening into an underlying eating disorder. This, in turn, may allow for earlier diagnosis and therapeutic intervention,” Dr. Hundemer said.

The study was published online in JAMA Network Open.
 

Tailored screening?

Electrolyte abnormalities are often found when an individual is diagnosed with an eating disorder, but it’s largely unknown whether electrolyte abnormalities prior to the acute presentation of an eating disorder are associated with the future diagnosis of an eating disorder.

To investigate, the researchers used administrative health data to match 6,970 individuals (mean age, 28 years; 13% male) with an eating disorder diagnosis to 27,878 controls without an eating disorder diagnosis.

They found that individuals with an eating disorder were more likely to have a preceding electrolyte abnormality, compared with peers without an eating disorder (18.4% vs. 7.5%).

An outpatient electrolyte abnormality present 3 years to 30 days prior to diagnosis was associated with about a twofold higher odds for subsequent eating disorder diagnosis (adjusted odds ratio, 2.12; 95% confidence interval, 1.86-2.41).

The median time from the earliest electrolyte abnormality to eating disorder diagnosis was 386 days (range, 157-716 days).

Hypokalemia was the most common electrolyte abnormality (present in 12% of cases vs. 5% of controls), while hyponatremia, hypernatremia, hypophosphatemia, and metabolic alkalosis were the most specific for a subsequent eating disorder diagnosis.

Severe hypokalemia (serum potassium levels of 3.0 mmol/L or lower) and severe hyponatremia (serum sodium, 128 mmol/L or lower) were associated with over sevenfold and fivefold higher odds for the diagnosis of an eating disorder, respectively.

The U.S. Preventive Services Task Force issued its first-ever statement on screening for eating disorders earlier this year.

The task force concluded that there is insufficient evidence to weigh the balance of benefits and harms of screening for eating disorders in adolescents and adults with no signs or symptoms of an eating disorder or concerns about their eating and who have not previously been diagnosed with an eating disorder.

Dr. Hundemer and colleagues believe an incidental electrolyte abnormality may identify candidates at high risk for an underlying eating disorder who many benefit from screening.

Several screening tools of varying complexity have been developed that are validated and accurate in identifying individuals with a potential eating disorder.

They include the SCOFF questionnaire, the Eating Disorder Screen for Primary Care, the Eating Attitudes Test, and the Primary Care Evaluation of Mental Disorders Patient Health Questionnaire.
 

Underdiagnosed, undertreated

Offering perspective on the findings, Kamryn T. Eddy, PhD, codirector, Eating Disorders Clinical and Research Program, Massachusetts General Hospital, Boston, said the notion “that a physical sign may help to promote eating disorder assessment is important particularly given that early detection can improve outcomes.”

“But this finding appears in the current context of eating disorders going largely underdetected, underdiagnosed, and undertreated across medical and psychiatric settings,” said Dr. Eddy, associate professor, department of psychiatry, Harvard Medical School, Boston.

“Indeed, eating disorders are prevalent and cut across age, sex, gender, weight, race, ethnicity, and socioeconomic strata, and still, many providers do not routinely assess for eating disorders,” Dr. Eddy said.

“I might suggest that perhaps in addition to letting electrolyte abnormalities be a cue to screen for eating disorders, an even more powerful shift toward routine screening and assessment of eating disorders by medical providers be made,” Dr. Eddy said in an interview.

This study was supported by ICES, which is funded by an annual grant from the Ontario Ministry of Health and the Ministry of Health and Long-Term Care. Dr. Hundemer and Dr. Eddy have disclosed no relevant financial relationships.

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

Electrolyte abnormalities may serve as a precursor to a future eating disorder diagnosis, a finding that may help pinpoint candidates for screening.

Researchers found that adolescents and adults with electrolyte abnormalities on routine outpatient lab work were twice as likely as those without these disturbances to be subsequently diagnosed with an eating disorder.

“These electrolyte abnormalities were in fact seen well ahead (> 1 year on average) of the time when patients were diagnosed with eating disorders,” study investigator Gregory Hundemer, MD, department of nephrology, University of Ottawa, told this news organization.

“Incidentally discovered outpatient electrolyte abnormalities may help to identify individuals who may benefit from more targeted screening into an underlying eating disorder. This, in turn, may allow for earlier diagnosis and therapeutic intervention,” Dr. Hundemer said.

The study was published online in JAMA Network Open.
 

Tailored screening?

Electrolyte abnormalities are often found when an individual is diagnosed with an eating disorder, but it’s largely unknown whether electrolyte abnormalities prior to the acute presentation of an eating disorder are associated with the future diagnosis of an eating disorder.

To investigate, the researchers used administrative health data to match 6,970 individuals (mean age, 28 years; 13% male) with an eating disorder diagnosis to 27,878 controls without an eating disorder diagnosis.

They found that individuals with an eating disorder were more likely to have a preceding electrolyte abnormality, compared with peers without an eating disorder (18.4% vs. 7.5%).

An outpatient electrolyte abnormality present 3 years to 30 days prior to diagnosis was associated with about a twofold higher odds for subsequent eating disorder diagnosis (adjusted odds ratio, 2.12; 95% confidence interval, 1.86-2.41).

The median time from the earliest electrolyte abnormality to eating disorder diagnosis was 386 days (range, 157-716 days).

Hypokalemia was the most common electrolyte abnormality (present in 12% of cases vs. 5% of controls), while hyponatremia, hypernatremia, hypophosphatemia, and metabolic alkalosis were the most specific for a subsequent eating disorder diagnosis.

Severe hypokalemia (serum potassium levels of 3.0 mmol/L or lower) and severe hyponatremia (serum sodium, 128 mmol/L or lower) were associated with over sevenfold and fivefold higher odds for the diagnosis of an eating disorder, respectively.

The U.S. Preventive Services Task Force issued its first-ever statement on screening for eating disorders earlier this year.

The task force concluded that there is insufficient evidence to weigh the balance of benefits and harms of screening for eating disorders in adolescents and adults with no signs or symptoms of an eating disorder or concerns about their eating and who have not previously been diagnosed with an eating disorder.

Dr. Hundemer and colleagues believe an incidental electrolyte abnormality may identify candidates at high risk for an underlying eating disorder who many benefit from screening.

Several screening tools of varying complexity have been developed that are validated and accurate in identifying individuals with a potential eating disorder.

They include the SCOFF questionnaire, the Eating Disorder Screen for Primary Care, the Eating Attitudes Test, and the Primary Care Evaluation of Mental Disorders Patient Health Questionnaire.
 

Underdiagnosed, undertreated

Offering perspective on the findings, Kamryn T. Eddy, PhD, codirector, Eating Disorders Clinical and Research Program, Massachusetts General Hospital, Boston, said the notion “that a physical sign may help to promote eating disorder assessment is important particularly given that early detection can improve outcomes.”

“But this finding appears in the current context of eating disorders going largely underdetected, underdiagnosed, and undertreated across medical and psychiatric settings,” said Dr. Eddy, associate professor, department of psychiatry, Harvard Medical School, Boston.

“Indeed, eating disorders are prevalent and cut across age, sex, gender, weight, race, ethnicity, and socioeconomic strata, and still, many providers do not routinely assess for eating disorders,” Dr. Eddy said.

“I might suggest that perhaps in addition to letting electrolyte abnormalities be a cue to screen for eating disorders, an even more powerful shift toward routine screening and assessment of eating disorders by medical providers be made,” Dr. Eddy said in an interview.

This study was supported by ICES, which is funded by an annual grant from the Ontario Ministry of Health and the Ministry of Health and Long-Term Care. Dr. Hundemer and Dr. Eddy have disclosed no relevant financial relationships.

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

Undiagnosed atrial fibrillation (AFib) was significantly more common among adults with obstructive sleep apnea (OSA), compared with controls, based on data from 303 individuals.

OSA has become a common chronic disease, and cardiovascular diseases including AFib also are known independent risk factors associated with OSA, Anna Hojager, MD, of Zealand University Hospital, Roskilde, Denmark, and colleagues wrote. Previous studies have shown a significant increase in AFib risk in OSA patients with severe disease, but the prevalence of undiagnosed AFib in OSA patients has not been explored.

In a study published in Sleep Medicine, the researchers enrolled 238 adults with severe OSA (based on apnea-hypopnea index of 15 or higher) and 65 with mild or no OSA (based on an AHI of less than 15). The mean AHI across all participants was 34.2, and ranged from 0.2 to 115.8.

Participants underwent heart rhythm monitoring using a home system or standard ECG for 7 days; they were instructed to carry the device at all times except when showering or sweating heavily. The primary outcome was the detection of AFib, defined as at least one period of 30 seconds or longer with an irregular heart rhythm but without detectable evidence of another diagnosis. Sleep was assessed for one night using a portable sleep monitoring device. All participants were examined at baseline and measured for blood pressure, body mass index, waist-to-hip ratio, and ECG.

Overall, AFib occurred in 21 patients with moderate to severe OSA and 1 patient with mild/no OSA (8.8% vs. 1.5%, P = .045). The majority of patients across both groups had hypertension (66%) and dyslipidemia (77.6%), but the severe OSA group was more likely to be dysregulated and to have unknown prediabetes. Participants who were deemed candidates for anticoagulation therapy were referred for additional treatment. None of the 22 total patients with AFib had heart failure with reduced ejection fraction, and 68.2% had normal ejection fraction and ventricle function.

The researchers noted that no guidelines currently exist for systematic opportunistic screening for comorbidities in OSA patients, although the American Academy of Sleep Medicine recommends patient education as part of a multidisciplinary chronic disease management strategy. The high prevalence of AFib in OSA patients, as seen in the current study, “might warrant a recommendation of screening for paroxysmal [AFib] and could be valuable in the management of modifiable cardiovascular risk factors in patients with OSA,” they wrote.

The study findings were limited by several factors including the observational design and absence of polysomnography to assess OSA, the researchers noted. However, the study has the highest known prevalence of silent AFib in patients with moderate to severe OSA, and supports the value of screening and management for known comorbidities of OSA.

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

Undiagnosed atrial fibrillation (AFib) was significantly more common among adults with obstructive sleep apnea (OSA), compared with controls, based on data from 303 individuals.

OSA has become a common chronic disease, and cardiovascular diseases including AFib also are known independent risk factors associated with OSA, Anna Hojager, MD, of Zealand University Hospital, Roskilde, Denmark, and colleagues wrote. Previous studies have shown a significant increase in AFib risk in OSA patients with severe disease, but the prevalence of undiagnosed AFib in OSA patients has not been explored.

In a study published in Sleep Medicine, the researchers enrolled 238 adults with severe OSA (based on apnea-hypopnea index of 15 or higher) and 65 with mild or no OSA (based on an AHI of less than 15). The mean AHI across all participants was 34.2, and ranged from 0.2 to 115.8.

Participants underwent heart rhythm monitoring using a home system or standard ECG for 7 days; they were instructed to carry the device at all times except when showering or sweating heavily. The primary outcome was the detection of AFib, defined as at least one period of 30 seconds or longer with an irregular heart rhythm but without detectable evidence of another diagnosis. Sleep was assessed for one night using a portable sleep monitoring device. All participants were examined at baseline and measured for blood pressure, body mass index, waist-to-hip ratio, and ECG.

Overall, AFib occurred in 21 patients with moderate to severe OSA and 1 patient with mild/no OSA (8.8% vs. 1.5%, P = .045). The majority of patients across both groups had hypertension (66%) and dyslipidemia (77.6%), but the severe OSA group was more likely to be dysregulated and to have unknown prediabetes. Participants who were deemed candidates for anticoagulation therapy were referred for additional treatment. None of the 22 total patients with AFib had heart failure with reduced ejection fraction, and 68.2% had normal ejection fraction and ventricle function.

The researchers noted that no guidelines currently exist for systematic opportunistic screening for comorbidities in OSA patients, although the American Academy of Sleep Medicine recommends patient education as part of a multidisciplinary chronic disease management strategy. The high prevalence of AFib in OSA patients, as seen in the current study, “might warrant a recommendation of screening for paroxysmal [AFib] and could be valuable in the management of modifiable cardiovascular risk factors in patients with OSA,” they wrote.

The study findings were limited by several factors including the observational design and absence of polysomnography to assess OSA, the researchers noted. However, the study has the highest known prevalence of silent AFib in patients with moderate to severe OSA, and supports the value of screening and management for known comorbidities of OSA.

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

Undiagnosed atrial fibrillation (AFib) was significantly more common among adults with obstructive sleep apnea (OSA), compared with controls, based on data from 303 individuals.

OSA has become a common chronic disease, and cardiovascular diseases including AFib also are known independent risk factors associated with OSA, Anna Hojager, MD, of Zealand University Hospital, Roskilde, Denmark, and colleagues wrote. Previous studies have shown a significant increase in AFib risk in OSA patients with severe disease, but the prevalence of undiagnosed AFib in OSA patients has not been explored.

In a study published in Sleep Medicine, the researchers enrolled 238 adults with severe OSA (based on apnea-hypopnea index of 15 or higher) and 65 with mild or no OSA (based on an AHI of less than 15). The mean AHI across all participants was 34.2, and ranged from 0.2 to 115.8.

Participants underwent heart rhythm monitoring using a home system or standard ECG for 7 days; they were instructed to carry the device at all times except when showering or sweating heavily. The primary outcome was the detection of AFib, defined as at least one period of 30 seconds or longer with an irregular heart rhythm but without detectable evidence of another diagnosis. Sleep was assessed for one night using a portable sleep monitoring device. All participants were examined at baseline and measured for blood pressure, body mass index, waist-to-hip ratio, and ECG.

Overall, AFib occurred in 21 patients with moderate to severe OSA and 1 patient with mild/no OSA (8.8% vs. 1.5%, P = .045). The majority of patients across both groups had hypertension (66%) and dyslipidemia (77.6%), but the severe OSA group was more likely to be dysregulated and to have unknown prediabetes. Participants who were deemed candidates for anticoagulation therapy were referred for additional treatment. None of the 22 total patients with AFib had heart failure with reduced ejection fraction, and 68.2% had normal ejection fraction and ventricle function.

The researchers noted that no guidelines currently exist for systematic opportunistic screening for comorbidities in OSA patients, although the American Academy of Sleep Medicine recommends patient education as part of a multidisciplinary chronic disease management strategy. The high prevalence of AFib in OSA patients, as seen in the current study, “might warrant a recommendation of screening for paroxysmal [AFib] and could be valuable in the management of modifiable cardiovascular risk factors in patients with OSA,” they wrote.

The study findings were limited by several factors including the observational design and absence of polysomnography to assess OSA, the researchers noted. However, the study has the highest known prevalence of silent AFib in patients with moderate to severe OSA, and supports the value of screening and management for known comorbidities of OSA.

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

CHICAGO – Early ablation of atrial fibrillation (AFib) reduces the risk of progression, compared with antiarrhythmic therapies, according to results of a multicenter, randomized trial called PROGRESSIVE-AF.

Over 36 months of follow-up, the trial linked early ablation with a reduced risk of persistent AFib (1.9% vs. 7.4%), and in addition, those in the ablation group were less likely to have recurrent atrial tachyarrhythmias of any kind (56.5% vs. 77.2%), reported Jason G. Andrade, MD, at the American Heart Association scientific sessions.

Ted Bosworth/MDedge

Serving as a long-term extension of the EARLY-AF trial published almost 2 years ago, this trial expands evidence that progressive AFib can be attenuated, a concept that has been debated.

“Can early AFib ablation stop progression?” asked Carina Blomström-Lindqvist, MD, PhD. The invited discussant for the PROGRESSION-AF trial, Dr. Blomström-Lundqvist concluded, “here is another set of data that suggests it can.”

By another set of data, Dr. Blomström-Lindqvist was referring to a previously published multinational study called ATTEST In this study, which involved 29 sites worldwide and compared radiofrequency ablation to antiarrhythmic drug therapy, early ablation also produced a lower risk of persistent AFib at the end of 3 years (2.4% vs. 17.5%; P = .0009).

In the previously published open-label EARLY-AF trial, 303 patients with paroxysmal, untreated AFib were randomized to cryoballoon ablation or antiarrhythmic drugs. The primary endpoint was the first documented recurrence of an atrial tachyarrhythmia between 91 and 365 days. The lower rate following ablation (42.9% vs. 67.8%) represented a more than 50% reduction in risk (hazard ratio, 0.48; P < .001) relative to antiarrhythmic therapy.

In PROGRESSIVE-AF, the same 303 patients were monitored continuously for an additional 24 months with an implanted cardiac monitor programmed with an AFib-detection algorithm. The data from the monitor were obtained daily. Over the final 2 years of the study, office visits were conducted every 6 months.
 

Tachyarrhythmias represent primary endpoint

In addition to persistent AFib, defined as lasting ≥ 7 days or lasting 48 hours to 7 days but requiring cardioversion for termination, patients in PROGRESSIVE-AF were also monitored for recurrent atrial tachyarrhythmias, AFib burden, quality of life (QOL), and health care utilization, and safety.

The average age was roughly 58 years. Although more than one-third had hypertension, most had no other comorbidities. The authors emphasized that the study population overall was relatively young and healthy.

Those randomized to antiarrhythmic therapy in EARLY-AF/PROGRESSIVE-AF received commonly prescribed therapies titrated to maximally tolerated doses using standardized protocols. At the start of EARLY-AF, flecainide, taken by 65% of patients, was the most commonly used agent, followed by sotalol, propafenone, dronedarone, and amiodarone.

At the end of PROGRESSIVE-AF, the order of the most common therapies did not change relative to EARLY-AF, but only 49% of patients were taking flecainide and 31% were no longer taking any antiarrhythmic therapy.

At the end of 3 years of follow-up in EARLY-AF/PROGRESSIVE-AF, the difference in persistent AFib represented a 75% reduction in favor of early ablation (HR, 0.25; 95% confidence interval, 0.09-0.70).

In those treated with ablation relative to those treated with antiarrhythmic therapy, the lower rate of atrial tachyarrhythmia lasting more than 7 days (1.9% vs. 6.0%) represented a 70% risk reduction (HR, 0.30; 95% CI 0.10-0.93). The protection from cardioversion for atrial tachyarrhythmia lasting between 2 and 7 days in duration (0.6% vs. 4.7%) translated into an 86% relative reduction (HR, 0.14; 95% CI, 0.02-0.85).

The impact on QOL for those randomized to ablation, which was measured with both AFib-specific and generic measures, was meaningful to patients, according to Dr. Andrade, director of the Cardiac Electrophysiology Laboratory, Vancouver General Hospital.

For example, the mean difference in the AF Quality of Life Survey (AFEQT), was 8.0 at 1 year and 7.4 at 3 years in favor of ablation. A change of 5 points in this score is considered to be a clinically meaningful difference, according to Dr. Andrade.

Numerically, the relative risk of emergency room visits and cardioversion were lower in the ablation group, but the differences did not reach statistical significance. However, the lower hazard ratio for hospitalization was significant (HR, 0.31; 95% CI, 0.15-0.66), supporting a reduction in consumption of health care resources.
 

Ablation found safer than drugs

The rate of adverse events of any kind (11.0% vs. 23.5%) and serious adverse events (4.5% vs. 10.1%) were lower in the ablation group.

There were no differences in major adverse cardiovascular events observed in this period of follow-up, but Dr. Andrade pointed out that follow-up was not long enough to expect differences in these events.

Impressed by the magnitude of the reduction in persistent AFib in a population of relatively young and healthy patients considered to be at a low risk of AFib progression, Dr. Blomström-Lindqvist, a professor of cardiology at the Institution of Medical Science, Uppsala, Sweden, indicated that the data support early ablation as a means to reduce risk of this outcome.

However, she did caution that progressive AFib was observed in a relatively small proportion of patients managed with antiarrhythmic therapy at 3 years, an outcome relevant when discussing treatment options with patients.

The results were published in New England Journal of Medicine simultaneously with Dr. Andrade’s presentation.

Dr. Andrade reports financial relationships with Bayer, Bayliss, Biosense, Bristol-Myers Squibb, Medtronic and Servier. The trial, funded largely by the Canadian government and Canadian professional societies, received additional funding from Bayliss and Medtronic. Dr. Blomström-Lundqvist reports financial relationships with Bayer, Boston Scientific, Cathprint, Medtronic, and Sanofi.

CHICAGO – Early ablation of atrial fibrillation (AFib) reduces the risk of progression, compared with antiarrhythmic therapies, according to results of a multicenter, randomized trial called PROGRESSIVE-AF.

Over 36 months of follow-up, the trial linked early ablation with a reduced risk of persistent AFib (1.9% vs. 7.4%), and in addition, those in the ablation group were less likely to have recurrent atrial tachyarrhythmias of any kind (56.5% vs. 77.2%), reported Jason G. Andrade, MD, at the American Heart Association scientific sessions.

Ted Bosworth/MDedge

Serving as a long-term extension of the EARLY-AF trial published almost 2 years ago, this trial expands evidence that progressive AFib can be attenuated, a concept that has been debated.

“Can early AFib ablation stop progression?” asked Carina Blomström-Lindqvist, MD, PhD. The invited discussant for the PROGRESSION-AF trial, Dr. Blomström-Lundqvist concluded, “here is another set of data that suggests it can.”

By another set of data, Dr. Blomström-Lindqvist was referring to a previously published multinational study called ATTEST In this study, which involved 29 sites worldwide and compared radiofrequency ablation to antiarrhythmic drug therapy, early ablation also produced a lower risk of persistent AFib at the end of 3 years (2.4% vs. 17.5%; P = .0009).

In the previously published open-label EARLY-AF trial, 303 patients with paroxysmal, untreated AFib were randomized to cryoballoon ablation or antiarrhythmic drugs. The primary endpoint was the first documented recurrence of an atrial tachyarrhythmia between 91 and 365 days. The lower rate following ablation (42.9% vs. 67.8%) represented a more than 50% reduction in risk (hazard ratio, 0.48; P < .001) relative to antiarrhythmic therapy.

In PROGRESSIVE-AF, the same 303 patients were monitored continuously for an additional 24 months with an implanted cardiac monitor programmed with an AFib-detection algorithm. The data from the monitor were obtained daily. Over the final 2 years of the study, office visits were conducted every 6 months.
 

Tachyarrhythmias represent primary endpoint

In addition to persistent AFib, defined as lasting ≥ 7 days or lasting 48 hours to 7 days but requiring cardioversion for termination, patients in PROGRESSIVE-AF were also monitored for recurrent atrial tachyarrhythmias, AFib burden, quality of life (QOL), and health care utilization, and safety.

The average age was roughly 58 years. Although more than one-third had hypertension, most had no other comorbidities. The authors emphasized that the study population overall was relatively young and healthy.

Those randomized to antiarrhythmic therapy in EARLY-AF/PROGRESSIVE-AF received commonly prescribed therapies titrated to maximally tolerated doses using standardized protocols. At the start of EARLY-AF, flecainide, taken by 65% of patients, was the most commonly used agent, followed by sotalol, propafenone, dronedarone, and amiodarone.

At the end of PROGRESSIVE-AF, the order of the most common therapies did not change relative to EARLY-AF, but only 49% of patients were taking flecainide and 31% were no longer taking any antiarrhythmic therapy.

At the end of 3 years of follow-up in EARLY-AF/PROGRESSIVE-AF, the difference in persistent AFib represented a 75% reduction in favor of early ablation (HR, 0.25; 95% confidence interval, 0.09-0.70).

In those treated with ablation relative to those treated with antiarrhythmic therapy, the lower rate of atrial tachyarrhythmia lasting more than 7 days (1.9% vs. 6.0%) represented a 70% risk reduction (HR, 0.30; 95% CI 0.10-0.93). The protection from cardioversion for atrial tachyarrhythmia lasting between 2 and 7 days in duration (0.6% vs. 4.7%) translated into an 86% relative reduction (HR, 0.14; 95% CI, 0.02-0.85).

The impact on QOL for those randomized to ablation, which was measured with both AFib-specific and generic measures, was meaningful to patients, according to Dr. Andrade, director of the Cardiac Electrophysiology Laboratory, Vancouver General Hospital.

For example, the mean difference in the AF Quality of Life Survey (AFEQT), was 8.0 at 1 year and 7.4 at 3 years in favor of ablation. A change of 5 points in this score is considered to be a clinically meaningful difference, according to Dr. Andrade.

Numerically, the relative risk of emergency room visits and cardioversion were lower in the ablation group, but the differences did not reach statistical significance. However, the lower hazard ratio for hospitalization was significant (HR, 0.31; 95% CI, 0.15-0.66), supporting a reduction in consumption of health care resources.
 

Ablation found safer than drugs

The rate of adverse events of any kind (11.0% vs. 23.5%) and serious adverse events (4.5% vs. 10.1%) were lower in the ablation group.

There were no differences in major adverse cardiovascular events observed in this period of follow-up, but Dr. Andrade pointed out that follow-up was not long enough to expect differences in these events.

Impressed by the magnitude of the reduction in persistent AFib in a population of relatively young and healthy patients considered to be at a low risk of AFib progression, Dr. Blomström-Lindqvist, a professor of cardiology at the Institution of Medical Science, Uppsala, Sweden, indicated that the data support early ablation as a means to reduce risk of this outcome.

However, she did caution that progressive AFib was observed in a relatively small proportion of patients managed with antiarrhythmic therapy at 3 years, an outcome relevant when discussing treatment options with patients.

The results were published in New England Journal of Medicine simultaneously with Dr. Andrade’s presentation.

Dr. Andrade reports financial relationships with Bayer, Bayliss, Biosense, Bristol-Myers Squibb, Medtronic and Servier. The trial, funded largely by the Canadian government and Canadian professional societies, received additional funding from Bayliss and Medtronic. Dr. Blomström-Lundqvist reports financial relationships with Bayer, Boston Scientific, Cathprint, Medtronic, and Sanofi.

CHICAGO – Early ablation of atrial fibrillation (AFib) reduces the risk of progression, compared with antiarrhythmic therapies, according to results of a multicenter, randomized trial called PROGRESSIVE-AF.

Over 36 months of follow-up, the trial linked early ablation with a reduced risk of persistent AFib (1.9% vs. 7.4%), and in addition, those in the ablation group were less likely to have recurrent atrial tachyarrhythmias of any kind (56.5% vs. 77.2%), reported Jason G. Andrade, MD, at the American Heart Association scientific sessions.

Ted Bosworth/MDedge

Serving as a long-term extension of the EARLY-AF trial published almost 2 years ago, this trial expands evidence that progressive AFib can be attenuated, a concept that has been debated.

“Can early AFib ablation stop progression?” asked Carina Blomström-Lindqvist, MD, PhD. The invited discussant for the PROGRESSION-AF trial, Dr. Blomström-Lundqvist concluded, “here is another set of data that suggests it can.”

By another set of data, Dr. Blomström-Lindqvist was referring to a previously published multinational study called ATTEST In this study, which involved 29 sites worldwide and compared radiofrequency ablation to antiarrhythmic drug therapy, early ablation also produced a lower risk of persistent AFib at the end of 3 years (2.4% vs. 17.5%; P = .0009).

In the previously published open-label EARLY-AF trial, 303 patients with paroxysmal, untreated AFib were randomized to cryoballoon ablation or antiarrhythmic drugs. The primary endpoint was the first documented recurrence of an atrial tachyarrhythmia between 91 and 365 days. The lower rate following ablation (42.9% vs. 67.8%) represented a more than 50% reduction in risk (hazard ratio, 0.48; P < .001) relative to antiarrhythmic therapy.

In PROGRESSIVE-AF, the same 303 patients were monitored continuously for an additional 24 months with an implanted cardiac monitor programmed with an AFib-detection algorithm. The data from the monitor were obtained daily. Over the final 2 years of the study, office visits were conducted every 6 months.
 

Tachyarrhythmias represent primary endpoint

In addition to persistent AFib, defined as lasting ≥ 7 days or lasting 48 hours to 7 days but requiring cardioversion for termination, patients in PROGRESSIVE-AF were also monitored for recurrent atrial tachyarrhythmias, AFib burden, quality of life (QOL), and health care utilization, and safety.

The average age was roughly 58 years. Although more than one-third had hypertension, most had no other comorbidities. The authors emphasized that the study population overall was relatively young and healthy.

Those randomized to antiarrhythmic therapy in EARLY-AF/PROGRESSIVE-AF received commonly prescribed therapies titrated to maximally tolerated doses using standardized protocols. At the start of EARLY-AF, flecainide, taken by 65% of patients, was the most commonly used agent, followed by sotalol, propafenone, dronedarone, and amiodarone.

At the end of PROGRESSIVE-AF, the order of the most common therapies did not change relative to EARLY-AF, but only 49% of patients were taking flecainide and 31% were no longer taking any antiarrhythmic therapy.

At the end of 3 years of follow-up in EARLY-AF/PROGRESSIVE-AF, the difference in persistent AFib represented a 75% reduction in favor of early ablation (HR, 0.25; 95% confidence interval, 0.09-0.70).

In those treated with ablation relative to those treated with antiarrhythmic therapy, the lower rate of atrial tachyarrhythmia lasting more than 7 days (1.9% vs. 6.0%) represented a 70% risk reduction (HR, 0.30; 95% CI 0.10-0.93). The protection from cardioversion for atrial tachyarrhythmia lasting between 2 and 7 days in duration (0.6% vs. 4.7%) translated into an 86% relative reduction (HR, 0.14; 95% CI, 0.02-0.85).

The impact on QOL for those randomized to ablation, which was measured with both AFib-specific and generic measures, was meaningful to patients, according to Dr. Andrade, director of the Cardiac Electrophysiology Laboratory, Vancouver General Hospital.

For example, the mean difference in the AF Quality of Life Survey (AFEQT), was 8.0 at 1 year and 7.4 at 3 years in favor of ablation. A change of 5 points in this score is considered to be a clinically meaningful difference, according to Dr. Andrade.

Numerically, the relative risk of emergency room visits and cardioversion were lower in the ablation group, but the differences did not reach statistical significance. However, the lower hazard ratio for hospitalization was significant (HR, 0.31; 95% CI, 0.15-0.66), supporting a reduction in consumption of health care resources.
 

Ablation found safer than drugs

The rate of adverse events of any kind (11.0% vs. 23.5%) and serious adverse events (4.5% vs. 10.1%) were lower in the ablation group.

There were no differences in major adverse cardiovascular events observed in this period of follow-up, but Dr. Andrade pointed out that follow-up was not long enough to expect differences in these events.

Impressed by the magnitude of the reduction in persistent AFib in a population of relatively young and healthy patients considered to be at a low risk of AFib progression, Dr. Blomström-Lindqvist, a professor of cardiology at the Institution of Medical Science, Uppsala, Sweden, indicated that the data support early ablation as a means to reduce risk of this outcome.

However, she did caution that progressive AFib was observed in a relatively small proportion of patients managed with antiarrhythmic therapy at 3 years, an outcome relevant when discussing treatment options with patients.

The results were published in New England Journal of Medicine simultaneously with Dr. Andrade’s presentation.

Dr. Andrade reports financial relationships with Bayer, Bayliss, Biosense, Bristol-Myers Squibb, Medtronic and Servier. The trial, funded largely by the Canadian government and Canadian professional societies, received additional funding from Bayliss and Medtronic. Dr. Blomström-Lundqvist reports financial relationships with Bayer, Boston Scientific, Cathprint, Medtronic, and Sanofi.

That a bustling medical conference can have global reach as it unfolds is one of the COVID pandemic’s many lessons for science. Hybrid meetings such as the American Heart Association scientific sessions, getting underway Nov. 5 in Chicago and cyberspace, are one of its legacies.

The conference is set to recapture the magic of the in-person Scientific Sessions last experienced in Philadelphia in 2019. But planners are mindful of a special responsibility to younger clinicians and scientists who entered the field knowing only the virtual format and who may not know “what it’s like in a room when major science is presented or to present posters and have people come by for conversations,” Manesh R. Patel, MD, chair of the AHA 2022 Scientific Sessions program committee, told this news organization.

Still, the pandemic has underlined the value of live streaming for the great many who can’t attend in person, Dr. Patel said. At AHA 2022, virtual access doesn’t mean only late breaking and featured presentations; more than 70 full sessions will be streamed from Friday through Monday.

Overall, the conference has more than 800 sessions on the schedule, about a third are panels or invited lectures and two-thirds are original reports on the latest research. At the core of the research offerings, 78 studies and analyses are slated across 18 Late-Breaking Science (LBS) and Featured Science (FS) sessions from Saturday through Monday. At least 30 presentations and abstracts will enter the peer-reviewed literature right away with their simultaneous online publication, Dr. Patel said.

More a meet-and-greet than a presentation, the Puppy Snuggles Booth will make a return appearance in Chicago after earning rave reviews at the 2019 Sessions in Philadelphia. All are invited to take a breather from their schedules to pet, cuddle, and play with a passel of pups, all in need of homes and available for adoption. The experience’s favorable effect on blood pressure is almost guaranteed.
 

LBS and FS highlights

“It’s an amazing year for Late Breaking Science and Featured Science at the Scientific Sessions,” Dr. Patel said of the presentations selected for special attention after a rigorous review process. “We have science that is as broad and as deep as we’ve seen in years.”

Saturday’s two LBS sessions kick off the series with studies looking at agents long available in heart failure and hypertension but lacking solid supporting evidence, “pretty large randomized trials that are, we think, going to affect clinical practice as soon as they are presented,” Dr. Patel said.

They include TRANSFORM-HF, a comparison of the loop diuretics furosemide and torsemide in patients hospitalized with heart failure. And the Diuretic Comparison Project (DCP), with more than 13,000 patients with hypertension assigned to the diuretics chlorthalidone or hydrochlorothiazide, “is going to immediately impact how people think about blood pressure management,” Dr. Patel said.

Other highlights in the hypertension arena include the CRHCP trial, the MB-BP study, the Rich Life Project, and the polypill efficacy and safety trial QUARTET-USA, all in Sunday’s LBS-4; and the FRESH, PRECISION, and BrigHTN trials, all in LBS-9 on Monday.

Other heart failure trials joining TRANSFORM-HF in the line-up include IRONMAN, which revisited IV iron therapy in iron-deficient patients, in LBS-2 on Saturday and, in FS-4 on Monday, BETA3LVH and STRONG-HF, the latter a timely randomized test of pre- and post-discharge biomarker-driven uptitration of guideline-directed heart failure meds.

STRONG-HF was halted early, the trial’s nonprofit sponsor announced only weeks ago, after patients following the intensive uptitration strategy versus usual care showed a reduced risk of death or heart failure readmission; few other details were given.

Several sessions will be devoted to a rare breed of randomized trial, one that tests the efficacy of traditional herbal meds or nonprescription supplements against proven medications. “These are going to get a lot of people’s interest, one can imagine, because they are on common questions that patients bring to the clinic every day,” Dr. Patel said.

Such studies include CTS-AMI, which explored the traditional Chinese herbal medicine tongxinluo in ST-segment elevation myocardial infarction, in LBS-3 on Sunday, and SPORT in Sunday’s LBS-5, a small randomized comparison of low-dose rosuvastatin, cinnamon, garlic, turmeric, an omega-3 fish-oil supplement, a plant sterol, red yeast rice, and placebo for any effects on LDL-C levels.

Other novel approaches to dyslipidemia management are to be covered in RESPECT-EPA and OCEAN(a)-DOSE, both in LBS-5 on Sunday, and all five presentations in Monday’s FS-9, including ARCHES-2, SHASTA-2, FOURIER-OLE, and ORION-3.

The interplay of antiplatelets and coronary interventions will be explored in presentations called OPTION, in LBS-6 on Sunday, and HOST-EXAM and TWILIGHT, in FS-6 on Monday.

Coronary and peripheral-vascular interventions are center stage in reports on RAPCO in LBS-3 and BRIGHT-4 in LBS-6, both on Sunday, and BEST-CLI in LBS-7 and the After-80 Study in FS-6, both on Monday.

Several Monday reports will cover comorbidities and complications associated with COVID-19, including PREVENT-HD in LBS-7, and PANAMO, FERMIN, COVID-NET, and a secondary analysis of the DELIVER trial in FS-5.
 

Rebroadcasts for the Pacific Rim

The sessions will also feature several evening rebroadcasts of earlier LBS sessions that meeting planners scored highly for scientific merit and potential clinical impact but also for their “regional pull,” primarily for our colleagues in Asia, Dr. Patel said.

The first two LBS sessions presented live during the day in Chicago will be rebroadcast that evening as, for example, Sunday morning and afternoon fare in Tokyo and Singapore. And LBS-5 live Sunday afternoon will rebroadcast that night as a Monday mid-morning session in, say, Hong Kong or Seoul.

This year’s AHA meeting spans the range of cardiovascular care, from precision therapies, such as gene editing or specific drugs, to broad strategies that consider, for example, social determinants of health, Dr. Patel said. “I think people, when they leave the Scientific Sessions, will feel very engaged in the larger conversation about how you impact very common conditions globally.”

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

That a bustling medical conference can have global reach as it unfolds is one of the COVID pandemic’s many lessons for science. Hybrid meetings such as the American Heart Association scientific sessions, getting underway Nov. 5 in Chicago and cyberspace, are one of its legacies.

The conference is set to recapture the magic of the in-person Scientific Sessions last experienced in Philadelphia in 2019. But planners are mindful of a special responsibility to younger clinicians and scientists who entered the field knowing only the virtual format and who may not know “what it’s like in a room when major science is presented or to present posters and have people come by for conversations,” Manesh R. Patel, MD, chair of the AHA 2022 Scientific Sessions program committee, told this news organization.

Still, the pandemic has underlined the value of live streaming for the great many who can’t attend in person, Dr. Patel said. At AHA 2022, virtual access doesn’t mean only late breaking and featured presentations; more than 70 full sessions will be streamed from Friday through Monday.

Overall, the conference has more than 800 sessions on the schedule, about a third are panels or invited lectures and two-thirds are original reports on the latest research. At the core of the research offerings, 78 studies and analyses are slated across 18 Late-Breaking Science (LBS) and Featured Science (FS) sessions from Saturday through Monday. At least 30 presentations and abstracts will enter the peer-reviewed literature right away with their simultaneous online publication, Dr. Patel said.

More a meet-and-greet than a presentation, the Puppy Snuggles Booth will make a return appearance in Chicago after earning rave reviews at the 2019 Sessions in Philadelphia. All are invited to take a breather from their schedules to pet, cuddle, and play with a passel of pups, all in need of homes and available for adoption. The experience’s favorable effect on blood pressure is almost guaranteed.
 

LBS and FS highlights

“It’s an amazing year for Late Breaking Science and Featured Science at the Scientific Sessions,” Dr. Patel said of the presentations selected for special attention after a rigorous review process. “We have science that is as broad and as deep as we’ve seen in years.”

Saturday’s two LBS sessions kick off the series with studies looking at agents long available in heart failure and hypertension but lacking solid supporting evidence, “pretty large randomized trials that are, we think, going to affect clinical practice as soon as they are presented,” Dr. Patel said.

They include TRANSFORM-HF, a comparison of the loop diuretics furosemide and torsemide in patients hospitalized with heart failure. And the Diuretic Comparison Project (DCP), with more than 13,000 patients with hypertension assigned to the diuretics chlorthalidone or hydrochlorothiazide, “is going to immediately impact how people think about blood pressure management,” Dr. Patel said.

Other highlights in the hypertension arena include the CRHCP trial, the MB-BP study, the Rich Life Project, and the polypill efficacy and safety trial QUARTET-USA, all in Sunday’s LBS-4; and the FRESH, PRECISION, and BrigHTN trials, all in LBS-9 on Monday.

Other heart failure trials joining TRANSFORM-HF in the line-up include IRONMAN, which revisited IV iron therapy in iron-deficient patients, in LBS-2 on Saturday and, in FS-4 on Monday, BETA3LVH and STRONG-HF, the latter a timely randomized test of pre- and post-discharge biomarker-driven uptitration of guideline-directed heart failure meds.

STRONG-HF was halted early, the trial’s nonprofit sponsor announced only weeks ago, after patients following the intensive uptitration strategy versus usual care showed a reduced risk of death or heart failure readmission; few other details were given.

Several sessions will be devoted to a rare breed of randomized trial, one that tests the efficacy of traditional herbal meds or nonprescription supplements against proven medications. “These are going to get a lot of people’s interest, one can imagine, because they are on common questions that patients bring to the clinic every day,” Dr. Patel said.

Such studies include CTS-AMI, which explored the traditional Chinese herbal medicine tongxinluo in ST-segment elevation myocardial infarction, in LBS-3 on Sunday, and SPORT in Sunday’s LBS-5, a small randomized comparison of low-dose rosuvastatin, cinnamon, garlic, turmeric, an omega-3 fish-oil supplement, a plant sterol, red yeast rice, and placebo for any effects on LDL-C levels.

Other novel approaches to dyslipidemia management are to be covered in RESPECT-EPA and OCEAN(a)-DOSE, both in LBS-5 on Sunday, and all five presentations in Monday’s FS-9, including ARCHES-2, SHASTA-2, FOURIER-OLE, and ORION-3.

The interplay of antiplatelets and coronary interventions will be explored in presentations called OPTION, in LBS-6 on Sunday, and HOST-EXAM and TWILIGHT, in FS-6 on Monday.

Coronary and peripheral-vascular interventions are center stage in reports on RAPCO in LBS-3 and BRIGHT-4 in LBS-6, both on Sunday, and BEST-CLI in LBS-7 and the After-80 Study in FS-6, both on Monday.

Several Monday reports will cover comorbidities and complications associated with COVID-19, including PREVENT-HD in LBS-7, and PANAMO, FERMIN, COVID-NET, and a secondary analysis of the DELIVER trial in FS-5.
 

Rebroadcasts for the Pacific Rim

The sessions will also feature several evening rebroadcasts of earlier LBS sessions that meeting planners scored highly for scientific merit and potential clinical impact but also for their “regional pull,” primarily for our colleagues in Asia, Dr. Patel said.

The first two LBS sessions presented live during the day in Chicago will be rebroadcast that evening as, for example, Sunday morning and afternoon fare in Tokyo and Singapore. And LBS-5 live Sunday afternoon will rebroadcast that night as a Monday mid-morning session in, say, Hong Kong or Seoul.

This year’s AHA meeting spans the range of cardiovascular care, from precision therapies, such as gene editing or specific drugs, to broad strategies that consider, for example, social determinants of health, Dr. Patel said. “I think people, when they leave the Scientific Sessions, will feel very engaged in the larger conversation about how you impact very common conditions globally.”

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

That a bustling medical conference can have global reach as it unfolds is one of the COVID pandemic’s many lessons for science. Hybrid meetings such as the American Heart Association scientific sessions, getting underway Nov. 5 in Chicago and cyberspace, are one of its legacies.

The conference is set to recapture the magic of the in-person Scientific Sessions last experienced in Philadelphia in 2019. But planners are mindful of a special responsibility to younger clinicians and scientists who entered the field knowing only the virtual format and who may not know “what it’s like in a room when major science is presented or to present posters and have people come by for conversations,” Manesh R. Patel, MD, chair of the AHA 2022 Scientific Sessions program committee, told this news organization.

Still, the pandemic has underlined the value of live streaming for the great many who can’t attend in person, Dr. Patel said. At AHA 2022, virtual access doesn’t mean only late breaking and featured presentations; more than 70 full sessions will be streamed from Friday through Monday.

Overall, the conference has more than 800 sessions on the schedule, about a third are panels or invited lectures and two-thirds are original reports on the latest research. At the core of the research offerings, 78 studies and analyses are slated across 18 Late-Breaking Science (LBS) and Featured Science (FS) sessions from Saturday through Monday. At least 30 presentations and abstracts will enter the peer-reviewed literature right away with their simultaneous online publication, Dr. Patel said.

More a meet-and-greet than a presentation, the Puppy Snuggles Booth will make a return appearance in Chicago after earning rave reviews at the 2019 Sessions in Philadelphia. All are invited to take a breather from their schedules to pet, cuddle, and play with a passel of pups, all in need of homes and available for adoption. The experience’s favorable effect on blood pressure is almost guaranteed.
 

LBS and FS highlights

“It’s an amazing year for Late Breaking Science and Featured Science at the Scientific Sessions,” Dr. Patel said of the presentations selected for special attention after a rigorous review process. “We have science that is as broad and as deep as we’ve seen in years.”

Saturday’s two LBS sessions kick off the series with studies looking at agents long available in heart failure and hypertension but lacking solid supporting evidence, “pretty large randomized trials that are, we think, going to affect clinical practice as soon as they are presented,” Dr. Patel said.

They include TRANSFORM-HF, a comparison of the loop diuretics furosemide and torsemide in patients hospitalized with heart failure. And the Diuretic Comparison Project (DCP), with more than 13,000 patients with hypertension assigned to the diuretics chlorthalidone or hydrochlorothiazide, “is going to immediately impact how people think about blood pressure management,” Dr. Patel said.

Other highlights in the hypertension arena include the CRHCP trial, the MB-BP study, the Rich Life Project, and the polypill efficacy and safety trial QUARTET-USA, all in Sunday’s LBS-4; and the FRESH, PRECISION, and BrigHTN trials, all in LBS-9 on Monday.

Other heart failure trials joining TRANSFORM-HF in the line-up include IRONMAN, which revisited IV iron therapy in iron-deficient patients, in LBS-2 on Saturday and, in FS-4 on Monday, BETA3LVH and STRONG-HF, the latter a timely randomized test of pre- and post-discharge biomarker-driven uptitration of guideline-directed heart failure meds.

STRONG-HF was halted early, the trial’s nonprofit sponsor announced only weeks ago, after patients following the intensive uptitration strategy versus usual care showed a reduced risk of death or heart failure readmission; few other details were given.

Several sessions will be devoted to a rare breed of randomized trial, one that tests the efficacy of traditional herbal meds or nonprescription supplements against proven medications. “These are going to get a lot of people’s interest, one can imagine, because they are on common questions that patients bring to the clinic every day,” Dr. Patel said.

Such studies include CTS-AMI, which explored the traditional Chinese herbal medicine tongxinluo in ST-segment elevation myocardial infarction, in LBS-3 on Sunday, and SPORT in Sunday’s LBS-5, a small randomized comparison of low-dose rosuvastatin, cinnamon, garlic, turmeric, an omega-3 fish-oil supplement, a plant sterol, red yeast rice, and placebo for any effects on LDL-C levels.

Other novel approaches to dyslipidemia management are to be covered in RESPECT-EPA and OCEAN(a)-DOSE, both in LBS-5 on Sunday, and all five presentations in Monday’s FS-9, including ARCHES-2, SHASTA-2, FOURIER-OLE, and ORION-3.

The interplay of antiplatelets and coronary interventions will be explored in presentations called OPTION, in LBS-6 on Sunday, and HOST-EXAM and TWILIGHT, in FS-6 on Monday.

Coronary and peripheral-vascular interventions are center stage in reports on RAPCO in LBS-3 and BRIGHT-4 in LBS-6, both on Sunday, and BEST-CLI in LBS-7 and the After-80 Study in FS-6, both on Monday.

Several Monday reports will cover comorbidities and complications associated with COVID-19, including PREVENT-HD in LBS-7, and PANAMO, FERMIN, COVID-NET, and a secondary analysis of the DELIVER trial in FS-5.
 

Rebroadcasts for the Pacific Rim

The sessions will also feature several evening rebroadcasts of earlier LBS sessions that meeting planners scored highly for scientific merit and potential clinical impact but also for their “regional pull,” primarily for our colleagues in Asia, Dr. Patel said.

The first two LBS sessions presented live during the day in Chicago will be rebroadcast that evening as, for example, Sunday morning and afternoon fare in Tokyo and Singapore. And LBS-5 live Sunday afternoon will rebroadcast that night as a Monday mid-morning session in, say, Hong Kong or Seoul.

This year’s AHA meeting spans the range of cardiovascular care, from precision therapies, such as gene editing or specific drugs, to broad strategies that consider, for example, social determinants of health, Dr. Patel said. “I think people, when they leave the Scientific Sessions, will feel very engaged in the larger conversation about how you impact very common conditions globally.”

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

A commonly prescribed direct oral anticoagulant (DOAC) has the lowest risk of bleeding, say researchers. Used to prevent strokes in those with atrial fibrillation (AFib), DOACs have recently become more common than warfarin, the previous standard treatment, as they do not require as much follow-up monitoring – which was “particularly valuable” during the COVID-19 pandemic – and have “less risk” of side effects, highlighted the authors of a new study, published in Annals of Internal Medicine.

However, the authors explained that, although current guidelines recommend using DOACs over warfarin in patients with AFib, “head-to-head trial data do not exist to guide the choice of DOAC.” So, they set out to try and fill this evidence gap by doing a large-scale comparison between all DOACs – apixaban, dabigatran, edoxaban, and rivaroxaban – in routine clinical practice.

Wallis Lau, PhD, University College London, and co–lead author, said: “Direct oral anticoagulants have been prescribed with increasing frequency worldwide in recent years, but evidence comparing them directly has been limited.”
 

One drug stood out

For the multinational population-based cohort study the researchers compared the efficacy and risk of side effects for the four most common DOACs. They reviewed data – from five standardized electronic health care databases that covered 221 million people in the United Kingdom, France, Germany, and the United States – of 527,226 patients who had been newly diagnosed with AFib between 2010 and 2019, and who had received a new DOAC prescription. The study included 281,320 apixaban users, 61,008 dabigatran users, 12,722 edoxaban users, and 172,176 rivaroxaban users.

Database-specific hazard ratios of ischemic stroke or systemic embolism, intracranial hemorrhage, gastrointestinal bleeding, and all-cause mortality between DOACs were estimated using a Cox regression model stratified by propensity score and pooled using a random-effects model.

In total, 9,530 ischemic stroke or systemic embolism events, 841 intercranial hemorrhage events, 8,319 gastrointestinal bleeding events, and 1,476 deaths were identified over the study follow-up. The researchers found that all four drugs were comparable on outcomes for ischemic stroke, intercranial hemorrhage, and all-cause mortality.

However, they identified a difference in the risk of gastrointestinal bleeding, which they highlighted “is one of the most common and concerning side effects of DOACs.”

“Apixaban stood out as having lower risk of gastrointestinal bleeding,” said the authors, with a 19%-28% lower risk when compared directly with each of the other three DOACs. Specifically, apixaban use was associated with lower risk for gastrointestinal bleeding than use of dabigatran (HR, 0.81; 95% confidence interval, 0.70-0.94), edoxaban (HR, 0.77; 95% CI, 0.66-0.91), or rivaroxaban (HR, 0.72; 95% CI, 0.66-0.79).

The researchers also highlighted that their findings held true when looking at data only from those aged over 80, and those with chronic kidney disease, two groups that are “often underrepresented” in clinical trials.
 

Apixaban may be preferable

The researchers concluded that, among patients with AFib, apixaban use was associated with lower risk for gastrointestinal bleeding and similar rates of ischemic stroke or systemic embolism, intracranial hemorrhage and all-cause mortality, compared with dabigatran, edoxaban, and rivaroxaban.

“Our results indicate that apixaban may be preferable to other blood thinners because of the lower rate of gastrointestinal bleeding and similar rates of stroke, a finding that we hope will be supported by randomized controlled trials,” said Dr. Lau.

However, he emphasized that, “as with all medications, potential risks and benefits can differ between people, so considering the full spectrum of outcomes and side effects will still be necessary for each individual patient.”

The authors all declared no conflicting interests.

A version of this article first appeared on Medscape UK.

A commonly prescribed direct oral anticoagulant (DOAC) has the lowest risk of bleeding, say researchers. Used to prevent strokes in those with atrial fibrillation (AFib), DOACs have recently become more common than warfarin, the previous standard treatment, as they do not require as much follow-up monitoring – which was “particularly valuable” during the COVID-19 pandemic – and have “less risk” of side effects, highlighted the authors of a new study, published in Annals of Internal Medicine.

However, the authors explained that, although current guidelines recommend using DOACs over warfarin in patients with AFib, “head-to-head trial data do not exist to guide the choice of DOAC.” So, they set out to try and fill this evidence gap by doing a large-scale comparison between all DOACs – apixaban, dabigatran, edoxaban, and rivaroxaban – in routine clinical practice.

Wallis Lau, PhD, University College London, and co–lead author, said: “Direct oral anticoagulants have been prescribed with increasing frequency worldwide in recent years, but evidence comparing them directly has been limited.”
 

One drug stood out

For the multinational population-based cohort study the researchers compared the efficacy and risk of side effects for the four most common DOACs. They reviewed data – from five standardized electronic health care databases that covered 221 million people in the United Kingdom, France, Germany, and the United States – of 527,226 patients who had been newly diagnosed with AFib between 2010 and 2019, and who had received a new DOAC prescription. The study included 281,320 apixaban users, 61,008 dabigatran users, 12,722 edoxaban users, and 172,176 rivaroxaban users.

Database-specific hazard ratios of ischemic stroke or systemic embolism, intracranial hemorrhage, gastrointestinal bleeding, and all-cause mortality between DOACs were estimated using a Cox regression model stratified by propensity score and pooled using a random-effects model.

In total, 9,530 ischemic stroke or systemic embolism events, 841 intercranial hemorrhage events, 8,319 gastrointestinal bleeding events, and 1,476 deaths were identified over the study follow-up. The researchers found that all four drugs were comparable on outcomes for ischemic stroke, intercranial hemorrhage, and all-cause mortality.

However, they identified a difference in the risk of gastrointestinal bleeding, which they highlighted “is one of the most common and concerning side effects of DOACs.”

“Apixaban stood out as having lower risk of gastrointestinal bleeding,” said the authors, with a 19%-28% lower risk when compared directly with each of the other three DOACs. Specifically, apixaban use was associated with lower risk for gastrointestinal bleeding than use of dabigatran (HR, 0.81; 95% confidence interval, 0.70-0.94), edoxaban (HR, 0.77; 95% CI, 0.66-0.91), or rivaroxaban (HR, 0.72; 95% CI, 0.66-0.79).

The researchers also highlighted that their findings held true when looking at data only from those aged over 80, and those with chronic kidney disease, two groups that are “often underrepresented” in clinical trials.
 

Apixaban may be preferable

The researchers concluded that, among patients with AFib, apixaban use was associated with lower risk for gastrointestinal bleeding and similar rates of ischemic stroke or systemic embolism, intracranial hemorrhage and all-cause mortality, compared with dabigatran, edoxaban, and rivaroxaban.

“Our results indicate that apixaban may be preferable to other blood thinners because of the lower rate of gastrointestinal bleeding and similar rates of stroke, a finding that we hope will be supported by randomized controlled trials,” said Dr. Lau.

However, he emphasized that, “as with all medications, potential risks and benefits can differ between people, so considering the full spectrum of outcomes and side effects will still be necessary for each individual patient.”

The authors all declared no conflicting interests.

A version of this article first appeared on Medscape UK.

A commonly prescribed direct oral anticoagulant (DOAC) has the lowest risk of bleeding, say researchers. Used to prevent strokes in those with atrial fibrillation (AFib), DOACs have recently become more common than warfarin, the previous standard treatment, as they do not require as much follow-up monitoring – which was “particularly valuable” during the COVID-19 pandemic – and have “less risk” of side effects, highlighted the authors of a new study, published in Annals of Internal Medicine.

However, the authors explained that, although current guidelines recommend using DOACs over warfarin in patients with AFib, “head-to-head trial data do not exist to guide the choice of DOAC.” So, they set out to try and fill this evidence gap by doing a large-scale comparison between all DOACs – apixaban, dabigatran, edoxaban, and rivaroxaban – in routine clinical practice.

Wallis Lau, PhD, University College London, and co–lead author, said: “Direct oral anticoagulants have been prescribed with increasing frequency worldwide in recent years, but evidence comparing them directly has been limited.”
 

One drug stood out

For the multinational population-based cohort study the researchers compared the efficacy and risk of side effects for the four most common DOACs. They reviewed data – from five standardized electronic health care databases that covered 221 million people in the United Kingdom, France, Germany, and the United States – of 527,226 patients who had been newly diagnosed with AFib between 2010 and 2019, and who had received a new DOAC prescription. The study included 281,320 apixaban users, 61,008 dabigatran users, 12,722 edoxaban users, and 172,176 rivaroxaban users.

Database-specific hazard ratios of ischemic stroke or systemic embolism, intracranial hemorrhage, gastrointestinal bleeding, and all-cause mortality between DOACs were estimated using a Cox regression model stratified by propensity score and pooled using a random-effects model.

In total, 9,530 ischemic stroke or systemic embolism events, 841 intercranial hemorrhage events, 8,319 gastrointestinal bleeding events, and 1,476 deaths were identified over the study follow-up. The researchers found that all four drugs were comparable on outcomes for ischemic stroke, intercranial hemorrhage, and all-cause mortality.

However, they identified a difference in the risk of gastrointestinal bleeding, which they highlighted “is one of the most common and concerning side effects of DOACs.”

“Apixaban stood out as having lower risk of gastrointestinal bleeding,” said the authors, with a 19%-28% lower risk when compared directly with each of the other three DOACs. Specifically, apixaban use was associated with lower risk for gastrointestinal bleeding than use of dabigatran (HR, 0.81; 95% confidence interval, 0.70-0.94), edoxaban (HR, 0.77; 95% CI, 0.66-0.91), or rivaroxaban (HR, 0.72; 95% CI, 0.66-0.79).

The researchers also highlighted that their findings held true when looking at data only from those aged over 80, and those with chronic kidney disease, two groups that are “often underrepresented” in clinical trials.
 

Apixaban may be preferable

The researchers concluded that, among patients with AFib, apixaban use was associated with lower risk for gastrointestinal bleeding and similar rates of ischemic stroke or systemic embolism, intracranial hemorrhage and all-cause mortality, compared with dabigatran, edoxaban, and rivaroxaban.

“Our results indicate that apixaban may be preferable to other blood thinners because of the lower rate of gastrointestinal bleeding and similar rates of stroke, a finding that we hope will be supported by randomized controlled trials,” said Dr. Lau.

However, he emphasized that, “as with all medications, potential risks and benefits can differ between people, so considering the full spectrum of outcomes and side effects will still be necessary for each individual patient.”

The authors all declared no conflicting interests.

A version of this article first appeared on Medscape UK.