Marilynn Larkin

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.

Outcomes were similar for comatose patients who received 36 versus 72 hours of device-based temperature control after out-of-hospital cardiac arrest, a randomized trial shows.

“Since 2005, active fever prevention in comatose patients has been advocated by the guidelines for 72 hours after an out-of-hospital cardiac arrest,” Christian Hassager, MD, of the University of Copenhagen, told this news organization. “Our study is the first randomized trial ever on this subject – and it challenges the guidelines.”

At 90 days, a primary endpoint – a composite of death from any cause or hospital discharge with a high Cerebral Performance Category score – occurred in 32.4% of those in the 36-hour group and 33.6% of those in the 72-hour group; mortality was 29.5% versus 30.3%, respectively.

The study was published online  in The New England Journal of Medicine. The results were also presented at the Resuscitation Science Symposium during the American Heart Association scientific sessions.
 

No significant differences

Assessment of the two device-based fever-prevention strategies for the duration was a predefined, additional randomly assigned open-label intervention in the Blood Pressure and Oxygenation Targets in Post Resuscitation Care (BOX) trial, which involved comatose adult patients who had been resuscitated after out-of-hospital cardiac arrest at two Danish cardiac arrest centers.

The main BOX analysis compared different primary strategies in these patients in a two-by-two factorial design: higher versus lower blood pressure targets and higher versus lower oxygenation targets. They found no difference between the various strategies in terms of death and discharge from hospital in a poor neurologic state. Those results were presented at the European Society of Cardiology Congress on Aug. 27, and simultaneously published in separate articles in The New England Journal of Medicine.

For this current analysis, a total of 789 comatose patients (mean age, 62; 80% men) received device-based temperature control targeting 36° C for 24 hours followed by 37° C for either 12 or 48 hours (total intervention times, 36 and 72 hours, respectively) or until the patient regained consciousness.

Patients were kept sedated and were receiving mechanical ventilation during the temperature control at 36° C, the authors note. Target core body temperature was controlled using commercially available surface cooling at one of the sites in 286 patients (Criticool and Allon, Belmont Medical Technologies) and using intravenous cooling in 503 patients at the other site (Thermogard XP, and Cool Line Catheter, Zoll).

Body temperature was maintained at 37° C with the same type of device that had been used for 36° C during the initial 24 hours. If the patient awakened, cooling was terminated.

Physicians in both groups were permitted to use non–device-based fever treatment (that is, for a body temperature > 37.5° C) with drugs such as paracetamol, by uncovering the patient’s body, or both, at the discretion of the treating physician. Ice packs or pads were not used.

The primary outcome was a composite of death from any cause or hospital discharge with a Cerebral Performance Category of 3 or 4 (range, 1 to 5, with higher scores indicating more severe disability) within 90 days after randomization.

Secondary outcomes at 90 days included death from any cause and the Montreal Cognitive Assessment score (range, 0 to 30, with higher scores indicating better cognitive ability).

A primary endpoint event occurred in 32.3% of patients in the 36-hour group and in 33.6% of those in the 72-hour group (hazard ratio, 0.99). Mortality was 29.5% in the 36-hour group and 30.3% in the 72-hour group.

The median Montreal Cognitive Assessment scores were 26 and 27, respectively. No significant between-group differences in the incidence of adverse events were observed.

The authors concluded that “active device-based fever prevention for 36 or 72 hours after cardiac arrest did not result in significantly different percentages of patients dying or having severe disability or coma.”

Dr. Hassager added, “We will continue with a new trial where we will randomize to treatment as usual or immediate wakeup call and no temperature intervention at all.”
 

Findings ‘very persuasive’

Intensivist Ken Parhar, MD, clinical associate professor, Critical Care Medicine at the University of Calgary (Alta.) and Alberta Health Services, Edmonton, and medical director, Cardiovascular Intensive Care Unit, commented on the study.

“The findings are very clear and very persuasive,” he said. “I think this should be incorporated into future guidelines, though it would be nice to see the trial repeated in another center.”

Dr. Parhar has kept comatose patients under temperature control for less than 72 hours, but mainly because those patients started to wake up. “This study provides clarity on the safety of that process – that we don’t have to unnecessarily keep somebody sedated just for an arbitrary timeline,” he said. “Beyond 36 hours, we need to continue to use our judgment.”

The study was supported by a grant from the Novo Nordisk Foundation, as was the work of one of the coauthors. Dr. Hassager’s work was funded by a grant from the Lundbeck Foundation; he also received an individual research grant from the Novo Nordisk Foundation, as well as honoraria from ABIOMED. No other disclosures were declared.

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

Outcomes were similar for comatose patients who received 36 versus 72 hours of device-based temperature control after out-of-hospital cardiac arrest, a randomized trial shows.

“Since 2005, active fever prevention in comatose patients has been advocated by the guidelines for 72 hours after an out-of-hospital cardiac arrest,” Christian Hassager, MD, of the University of Copenhagen, told this news organization. “Our study is the first randomized trial ever on this subject – and it challenges the guidelines.”

At 90 days, a primary endpoint – a composite of death from any cause or hospital discharge with a high Cerebral Performance Category score – occurred in 32.4% of those in the 36-hour group and 33.6% of those in the 72-hour group; mortality was 29.5% versus 30.3%, respectively.

The study was published online  in The New England Journal of Medicine. The results were also presented at the Resuscitation Science Symposium during the American Heart Association scientific sessions.
 

No significant differences

Assessment of the two device-based fever-prevention strategies for the duration was a predefined, additional randomly assigned open-label intervention in the Blood Pressure and Oxygenation Targets in Post Resuscitation Care (BOX) trial, which involved comatose adult patients who had been resuscitated after out-of-hospital cardiac arrest at two Danish cardiac arrest centers.

The main BOX analysis compared different primary strategies in these patients in a two-by-two factorial design: higher versus lower blood pressure targets and higher versus lower oxygenation targets. They found no difference between the various strategies in terms of death and discharge from hospital in a poor neurologic state. Those results were presented at the European Society of Cardiology Congress on Aug. 27, and simultaneously published in separate articles in The New England Journal of Medicine.

For this current analysis, a total of 789 comatose patients (mean age, 62; 80% men) received device-based temperature control targeting 36° C for 24 hours followed by 37° C for either 12 or 48 hours (total intervention times, 36 and 72 hours, respectively) or until the patient regained consciousness.

Patients were kept sedated and were receiving mechanical ventilation during the temperature control at 36° C, the authors note. Target core body temperature was controlled using commercially available surface cooling at one of the sites in 286 patients (Criticool and Allon, Belmont Medical Technologies) and using intravenous cooling in 503 patients at the other site (Thermogard XP, and Cool Line Catheter, Zoll).

Body temperature was maintained at 37° C with the same type of device that had been used for 36° C during the initial 24 hours. If the patient awakened, cooling was terminated.

Physicians in both groups were permitted to use non–device-based fever treatment (that is, for a body temperature > 37.5° C) with drugs such as paracetamol, by uncovering the patient’s body, or both, at the discretion of the treating physician. Ice packs or pads were not used.

The primary outcome was a composite of death from any cause or hospital discharge with a Cerebral Performance Category of 3 or 4 (range, 1 to 5, with higher scores indicating more severe disability) within 90 days after randomization.

Secondary outcomes at 90 days included death from any cause and the Montreal Cognitive Assessment score (range, 0 to 30, with higher scores indicating better cognitive ability).

A primary endpoint event occurred in 32.3% of patients in the 36-hour group and in 33.6% of those in the 72-hour group (hazard ratio, 0.99). Mortality was 29.5% in the 36-hour group and 30.3% in the 72-hour group.

The median Montreal Cognitive Assessment scores were 26 and 27, respectively. No significant between-group differences in the incidence of adverse events were observed.

The authors concluded that “active device-based fever prevention for 36 or 72 hours after cardiac arrest did not result in significantly different percentages of patients dying or having severe disability or coma.”

Dr. Hassager added, “We will continue with a new trial where we will randomize to treatment as usual or immediate wakeup call and no temperature intervention at all.”
 

Findings ‘very persuasive’

Intensivist Ken Parhar, MD, clinical associate professor, Critical Care Medicine at the University of Calgary (Alta.) and Alberta Health Services, Edmonton, and medical director, Cardiovascular Intensive Care Unit, commented on the study.

“The findings are very clear and very persuasive,” he said. “I think this should be incorporated into future guidelines, though it would be nice to see the trial repeated in another center.”

Dr. Parhar has kept comatose patients under temperature control for less than 72 hours, but mainly because those patients started to wake up. “This study provides clarity on the safety of that process – that we don’t have to unnecessarily keep somebody sedated just for an arbitrary timeline,” he said. “Beyond 36 hours, we need to continue to use our judgment.”

The study was supported by a grant from the Novo Nordisk Foundation, as was the work of one of the coauthors. Dr. Hassager’s work was funded by a grant from the Lundbeck Foundation; he also received an individual research grant from the Novo Nordisk Foundation, as well as honoraria from ABIOMED. No other disclosures were declared.

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

Outcomes were similar for comatose patients who received 36 versus 72 hours of device-based temperature control after out-of-hospital cardiac arrest, a randomized trial shows.

“Since 2005, active fever prevention in comatose patients has been advocated by the guidelines for 72 hours after an out-of-hospital cardiac arrest,” Christian Hassager, MD, of the University of Copenhagen, told this news organization. “Our study is the first randomized trial ever on this subject – and it challenges the guidelines.”

At 90 days, a primary endpoint – a composite of death from any cause or hospital discharge with a high Cerebral Performance Category score – occurred in 32.4% of those in the 36-hour group and 33.6% of those in the 72-hour group; mortality was 29.5% versus 30.3%, respectively.

The study was published online  in The New England Journal of Medicine. The results were also presented at the Resuscitation Science Symposium during the American Heart Association scientific sessions.
 

No significant differences

Assessment of the two device-based fever-prevention strategies for the duration was a predefined, additional randomly assigned open-label intervention in the Blood Pressure and Oxygenation Targets in Post Resuscitation Care (BOX) trial, which involved comatose adult patients who had been resuscitated after out-of-hospital cardiac arrest at two Danish cardiac arrest centers.

The main BOX analysis compared different primary strategies in these patients in a two-by-two factorial design: higher versus lower blood pressure targets and higher versus lower oxygenation targets. They found no difference between the various strategies in terms of death and discharge from hospital in a poor neurologic state. Those results were presented at the European Society of Cardiology Congress on Aug. 27, and simultaneously published in separate articles in The New England Journal of Medicine.

For this current analysis, a total of 789 comatose patients (mean age, 62; 80% men) received device-based temperature control targeting 36° C for 24 hours followed by 37° C for either 12 or 48 hours (total intervention times, 36 and 72 hours, respectively) or until the patient regained consciousness.

Patients were kept sedated and were receiving mechanical ventilation during the temperature control at 36° C, the authors note. Target core body temperature was controlled using commercially available surface cooling at one of the sites in 286 patients (Criticool and Allon, Belmont Medical Technologies) and using intravenous cooling in 503 patients at the other site (Thermogard XP, and Cool Line Catheter, Zoll).

Body temperature was maintained at 37° C with the same type of device that had been used for 36° C during the initial 24 hours. If the patient awakened, cooling was terminated.

Physicians in both groups were permitted to use non–device-based fever treatment (that is, for a body temperature > 37.5° C) with drugs such as paracetamol, by uncovering the patient’s body, or both, at the discretion of the treating physician. Ice packs or pads were not used.

The primary outcome was a composite of death from any cause or hospital discharge with a Cerebral Performance Category of 3 or 4 (range, 1 to 5, with higher scores indicating more severe disability) within 90 days after randomization.

Secondary outcomes at 90 days included death from any cause and the Montreal Cognitive Assessment score (range, 0 to 30, with higher scores indicating better cognitive ability).

A primary endpoint event occurred in 32.3% of patients in the 36-hour group and in 33.6% of those in the 72-hour group (hazard ratio, 0.99). Mortality was 29.5% in the 36-hour group and 30.3% in the 72-hour group.

The median Montreal Cognitive Assessment scores were 26 and 27, respectively. No significant between-group differences in the incidence of adverse events were observed.

The authors concluded that “active device-based fever prevention for 36 or 72 hours after cardiac arrest did not result in significantly different percentages of patients dying or having severe disability or coma.”

Dr. Hassager added, “We will continue with a new trial where we will randomize to treatment as usual or immediate wakeup call and no temperature intervention at all.”
 

Findings ‘very persuasive’

Intensivist Ken Parhar, MD, clinical associate professor, Critical Care Medicine at the University of Calgary (Alta.) and Alberta Health Services, Edmonton, and medical director, Cardiovascular Intensive Care Unit, commented on the study.

“The findings are very clear and very persuasive,” he said. “I think this should be incorporated into future guidelines, though it would be nice to see the trial repeated in another center.”

Dr. Parhar has kept comatose patients under temperature control for less than 72 hours, but mainly because those patients started to wake up. “This study provides clarity on the safety of that process – that we don’t have to unnecessarily keep somebody sedated just for an arbitrary timeline,” he said. “Beyond 36 hours, we need to continue to use our judgment.”

The study was supported by a grant from the Novo Nordisk Foundation, as was the work of one of the coauthors. Dr. Hassager’s work was funded by a grant from the Lundbeck Foundation; he also received an individual research grant from the Novo Nordisk Foundation, as well as honoraria from ABIOMED. No other disclosures were declared.

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

A new collaborative position paper on radiation exposure during pregnancy states that pregnant women can safely work in an ionizing radiation environment if exposure to the fetus does not exceed certain dose thresholds.

The position paper aims to “avoid discouraging” women from pursuing careers in interventional cardiology/electrophysiology (IC/EP) and to “dismantle” a barrier that says, “activity under x-rays, without any weighting, is incompatible with continuation of pregnancy,” lead author Stéphane Manzo-Silberman, MD, of AP-HP, Sorbonne Université, Paris, told this news organization.

“The main point of the statement is to show that it is possible and safe to maintain activity under radiation during pregnancy, [given] the data we have on the risk for the fetus at exposed doses, the regulations, and feedback from practice,” she said. “The data we currently have allowed us to be largely reassuring.”

The research showed that adverse effects on a fetus generally occur when radiation exposure is greater than 100 mGy. Most countries that permit pregnant women to work in IC/EP require that the cumulative dose during the pregnancy be less than 1 mSv. An exception is the United States, which permits a cumulative dose of less than 5 mSv.

The position paper, a collaboration among the European Association of Percutaneous Cardiovascular Interventions, the European Heart Rhythm Association, the European Association of Cardiovascular Imaging, the European Society of Cardiology Regulatory Affairs Committee, and Women as One, was published online in EuroIntervention.

The position paper covers regulations in various countries; fetal radiation doses that have been associated with ill effects, including abortion, malformations, and intelligence quotient reductions; the spontaneous probability of having a newborn with a congenital malformation or childhood cancer; and proposals to improve practice.

Highlights include the following:
 

• European, North American, Japanese, and Australian regulations permit pregnant women to work if closely monitored with an abdominal dosimeter; some countries, such as Austria, Hungary, Portugal, and Romania, do not allow women to work in IC/EP during pregnancy or breastfeeding.
• The maximum fetal dose exposure during pregnancy is 1 mSv in Europe, Australia, and Israel; 2 mSv in Japan; and 5 mSv in the United States.
• Doses associated with fetal harm are 100 times higher than those allowed during an interventional cardiologist’s entire pregnancy.
• There is a negligible risk increase in the spontaneous probability of a newborn having a congenital malformation or childhood cancer when the occupational exposure range of the mother respects a country’s limits.
• No studies have shown an increased risk of noncancerous adverse effects from prenatal radiation exposure less than 50 mSv.

To improve practice, the position paper suggests the following:

• Fluoroscopy operators must be guided by the “as low as reasonably achievable” principle: Obtaining optimal images must be balanced with procedure safety.
• Scatter radiation emitted from the patient is the main source of radiation exposure to the operator and personnel; reducing radiation to the patient will reduce exposure for staff.
• The three fundamentals of radiation safety for an operator are (1) time, (2) distance, and (3) shielding and dosimeter monitoring. Time refers to the amount of time the operator spends using the x-ray system; distance means maximizing distance from the x-ray source; and shielding includes personal, tableside, or external protection, with each form having a degree of lead equivalence defining its radiation protective effect.
• Changes in medical school curricula and creating a friendlier workplace environment for families and pregnant interventionists are among the strategies that will promote gender equity in the profession.

“Institutional radiation protection programs should be established to increase knowledge about radiation exposure and improve specific safety requirements for everyone. This would ensure safe exposure for all physicians, [including] during pregnancy,” Dr. Manzo-Silberman concluded.

Furthermore, she said, “As has already been demonstrated in the business world, improving representation and gender equity and diversity is key to improving results and efficiency. In the field of health, this translates into better care for our patients and better working conditions for health care professionals.”

No commercial funding was disclosed. Dr. Manzo-Silberman has received consulting fees from Bayer, Organon, and Exeltis; lecture fees from Bayer, BMS, Exeltis, and Organon; and has served on the adjudication board for a study for Biotronik.

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

A new collaborative position paper on radiation exposure during pregnancy states that pregnant women can safely work in an ionizing radiation environment if exposure to the fetus does not exceed certain dose thresholds.

The position paper aims to “avoid discouraging” women from pursuing careers in interventional cardiology/electrophysiology (IC/EP) and to “dismantle” a barrier that says, “activity under x-rays, without any weighting, is incompatible with continuation of pregnancy,” lead author Stéphane Manzo-Silberman, MD, of AP-HP, Sorbonne Université, Paris, told this news organization.

“The main point of the statement is to show that it is possible and safe to maintain activity under radiation during pregnancy, [given] the data we have on the risk for the fetus at exposed doses, the regulations, and feedback from practice,” she said. “The data we currently have allowed us to be largely reassuring.”

The research showed that adverse effects on a fetus generally occur when radiation exposure is greater than 100 mGy. Most countries that permit pregnant women to work in IC/EP require that the cumulative dose during the pregnancy be less than 1 mSv. An exception is the United States, which permits a cumulative dose of less than 5 mSv.

The position paper, a collaboration among the European Association of Percutaneous Cardiovascular Interventions, the European Heart Rhythm Association, the European Association of Cardiovascular Imaging, the European Society of Cardiology Regulatory Affairs Committee, and Women as One, was published online in EuroIntervention.

The position paper covers regulations in various countries; fetal radiation doses that have been associated with ill effects, including abortion, malformations, and intelligence quotient reductions; the spontaneous probability of having a newborn with a congenital malformation or childhood cancer; and proposals to improve practice.

Highlights include the following:
 

• European, North American, Japanese, and Australian regulations permit pregnant women to work if closely monitored with an abdominal dosimeter; some countries, such as Austria, Hungary, Portugal, and Romania, do not allow women to work in IC/EP during pregnancy or breastfeeding.
• The maximum fetal dose exposure during pregnancy is 1 mSv in Europe, Australia, and Israel; 2 mSv in Japan; and 5 mSv in the United States.
• Doses associated with fetal harm are 100 times higher than those allowed during an interventional cardiologist’s entire pregnancy.
• There is a negligible risk increase in the spontaneous probability of a newborn having a congenital malformation or childhood cancer when the occupational exposure range of the mother respects a country’s limits.
• No studies have shown an increased risk of noncancerous adverse effects from prenatal radiation exposure less than 50 mSv.

To improve practice, the position paper suggests the following:

• Fluoroscopy operators must be guided by the “as low as reasonably achievable” principle: Obtaining optimal images must be balanced with procedure safety.
• Scatter radiation emitted from the patient is the main source of radiation exposure to the operator and personnel; reducing radiation to the patient will reduce exposure for staff.
• The three fundamentals of radiation safety for an operator are (1) time, (2) distance, and (3) shielding and dosimeter monitoring. Time refers to the amount of time the operator spends using the x-ray system; distance means maximizing distance from the x-ray source; and shielding includes personal, tableside, or external protection, with each form having a degree of lead equivalence defining its radiation protective effect.
• Changes in medical school curricula and creating a friendlier workplace environment for families and pregnant interventionists are among the strategies that will promote gender equity in the profession.

“Institutional radiation protection programs should be established to increase knowledge about radiation exposure and improve specific safety requirements for everyone. This would ensure safe exposure for all physicians, [including] during pregnancy,” Dr. Manzo-Silberman concluded.

Furthermore, she said, “As has already been demonstrated in the business world, improving representation and gender equity and diversity is key to improving results and efficiency. In the field of health, this translates into better care for our patients and better working conditions for health care professionals.”

No commercial funding was disclosed. Dr. Manzo-Silberman has received consulting fees from Bayer, Organon, and Exeltis; lecture fees from Bayer, BMS, Exeltis, and Organon; and has served on the adjudication board for a study for Biotronik.

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

A new collaborative position paper on radiation exposure during pregnancy states that pregnant women can safely work in an ionizing radiation environment if exposure to the fetus does not exceed certain dose thresholds.

The position paper aims to “avoid discouraging” women from pursuing careers in interventional cardiology/electrophysiology (IC/EP) and to “dismantle” a barrier that says, “activity under x-rays, without any weighting, is incompatible with continuation of pregnancy,” lead author Stéphane Manzo-Silberman, MD, of AP-HP, Sorbonne Université, Paris, told this news organization.

“The main point of the statement is to show that it is possible and safe to maintain activity under radiation during pregnancy, [given] the data we have on the risk for the fetus at exposed doses, the regulations, and feedback from practice,” she said. “The data we currently have allowed us to be largely reassuring.”

The research showed that adverse effects on a fetus generally occur when radiation exposure is greater than 100 mGy. Most countries that permit pregnant women to work in IC/EP require that the cumulative dose during the pregnancy be less than 1 mSv. An exception is the United States, which permits a cumulative dose of less than 5 mSv.

The position paper, a collaboration among the European Association of Percutaneous Cardiovascular Interventions, the European Heart Rhythm Association, the European Association of Cardiovascular Imaging, the European Society of Cardiology Regulatory Affairs Committee, and Women as One, was published online in EuroIntervention.

The position paper covers regulations in various countries; fetal radiation doses that have been associated with ill effects, including abortion, malformations, and intelligence quotient reductions; the spontaneous probability of having a newborn with a congenital malformation or childhood cancer; and proposals to improve practice.

Highlights include the following:
 

• European, North American, Japanese, and Australian regulations permit pregnant women to work if closely monitored with an abdominal dosimeter; some countries, such as Austria, Hungary, Portugal, and Romania, do not allow women to work in IC/EP during pregnancy or breastfeeding.
• The maximum fetal dose exposure during pregnancy is 1 mSv in Europe, Australia, and Israel; 2 mSv in Japan; and 5 mSv in the United States.
• Doses associated with fetal harm are 100 times higher than those allowed during an interventional cardiologist’s entire pregnancy.
• There is a negligible risk increase in the spontaneous probability of a newborn having a congenital malformation or childhood cancer when the occupational exposure range of the mother respects a country’s limits.
• No studies have shown an increased risk of noncancerous adverse effects from prenatal radiation exposure less than 50 mSv.

To improve practice, the position paper suggests the following:

• Fluoroscopy operators must be guided by the “as low as reasonably achievable” principle: Obtaining optimal images must be balanced with procedure safety.
• Scatter radiation emitted from the patient is the main source of radiation exposure to the operator and personnel; reducing radiation to the patient will reduce exposure for staff.
• The three fundamentals of radiation safety for an operator are (1) time, (2) distance, and (3) shielding and dosimeter monitoring. Time refers to the amount of time the operator spends using the x-ray system; distance means maximizing distance from the x-ray source; and shielding includes personal, tableside, or external protection, with each form having a degree of lead equivalence defining its radiation protective effect.
• Changes in medical school curricula and creating a friendlier workplace environment for families and pregnant interventionists are among the strategies that will promote gender equity in the profession.

“Institutional radiation protection programs should be established to increase knowledge about radiation exposure and improve specific safety requirements for everyone. This would ensure safe exposure for all physicians, [including] during pregnancy,” Dr. Manzo-Silberman concluded.

Furthermore, she said, “As has already been demonstrated in the business world, improving representation and gender equity and diversity is key to improving results and efficiency. In the field of health, this translates into better care for our patients and better working conditions for health care professionals.”

No commercial funding was disclosed. Dr. Manzo-Silberman has received consulting fees from Bayer, Organon, and Exeltis; lecture fees from Bayer, BMS, Exeltis, and Organon; and has served on the adjudication board for a study for Biotronik.

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

A red blood cell–based platform delivered a potent antibiotic targeted to Escherichia coli in a preclinical trial.

Over several years, “we developed experimental and computational techniques to study how proteins and drugs interact with membranes,” Hannah Krivić, a graduate student, and Maikel C. Rheinstädter, PhD, a professor of physics, both at McMaster University in Hamilton, Ont., told this news organization.

In earlier work, these researchers investigated how antibiotics target bacterial membranes and how those membranes enable the development of antibiotic resistance. Then, they said, “we started to ... manipulate membranes by tuning their properties [with] synthetic lipid molecules to create ‘hybrid’ membranes – that is, functionalized biological membranes with optimized properties.

“We are now using this approach to functionalize red blood cells by using them as drug carriers. We optimize these cells to carry certain loads, such as drug molecules, and anchor proteins in their membranes that target receptors in bacteria to selectively and efficiently deliver that load.”

The strategy, they said, “has become a universal red blood cell–based delivery platform that we call ‘smart blood’ ... that can safely and selectively deliver antibiotics to certain bacterial targets.”

The platform currently is being tested in vitro, and in vivo testing is slated to begin in early 2023. Their study was published online in ACS Infectious Diseases.
 

Optimizing dosing

Polymyxin B (PmB) is one of a few potent antibiotics with promising efficacy against drug-resistant bacteria such as E. coli. PmB, however, is widely considered a treatment of last resort because of its toxic side effects (which include nephrotoxicity, neurotoxicity, and neuromuscular blockade) particularly at higher doses.

The researchers hypothesized that targeted delivery of PmB might lead to optimized dosing and potentially reduce the need for higher or repeated doses. In the current study, they tested the ability of the smart blood platform to deliver PmB to E. coli.

Creating “erythro-PmBs” involves removing the inner components of red blood cells, loading the cells with PmB, and coating the cell membranes (liposomes) with antibacterial (in this case, anti–E. coli) antibodies.

The in vitro experiments showed that the cells could be loaded with PmB and retain and selectively deliver the drug to E. coli, with no apparent hemolytic activity or nephrotoxicity. Specifically, the erythro-PmBs had a loading efficiency of approximately 90% and delivered PmB to E. coli with values for the minimum inhibitory concentration that were comparable with those of free PmB.

“In contrast to drug-delivery systems based on synthetic carriers, our erythrocytes have a high biocompatibility and can stay in circulation in the body for several weeks to provide a sustained and targeted release of the drug,” said Ms. Krivić and Dr. Rheinstädter. “This [profile] can make existing drugs safer by, for instance, increasing their efficacy while at the same time lowering the required dosage, thereby reducing side effects.”

The researchers are now exploring the ability of the smart blood platform to deliver neurotrophic factors across the blood-brain barrier to potentially treat neurodegenerative diseases. Their approach is identical to that used in the current study, they said, except in this case, the red blood cell membranes are designed to deliver neurotrophic factors specifically to the blood-brain barrier.
 

‘Certainly promising’

David W. Deamer, PhD, research professor of biomolecular engineering at the University of California, Santa Cruz, said in a comment: “This is certainly promising. The erythro-PmBs have a greater loading capacity and longer circulation time than ordinary liposomes used for drug delivery. They can also be prepared with specific antibodies so that the antibiotic is delivered more directly when they bind to bacterial pathogens.”

The effect on bacterial growth, however, was tested in a model system, not in an actual infection, he said, adding that an important next step will be to perform animal testing. “One of the simplest tests is induced sepsis in mice, which mimics a burst appendix. If the erythro-PmBs can treat sepsis effectively, it will be an encouraging sign that they have potential therapeutic value. It will also be interesting to see whether the antigens responsible for ABO blood groups are retained on the surfaces of the erythro-PmBs. If they are, it might be necessary to match donor blood to that of the recipient.

“Getting a product ready for clinical use will require partnership with a major pharmaceutical firm, several years of animal testing, and then several more years carrying out phase 1, 2, and 3 clinical trials in human patients,” Dr. Deamer concluded. 

No commercial funding was disclosed. Ms. Krivić, Dr. Rheinstädter, and Dr. Deamer reported no conflicts of interest.

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

A red blood cell–based platform delivered a potent antibiotic targeted to Escherichia coli in a preclinical trial.

Over several years, “we developed experimental and computational techniques to study how proteins and drugs interact with membranes,” Hannah Krivić, a graduate student, and Maikel C. Rheinstädter, PhD, a professor of physics, both at McMaster University in Hamilton, Ont., told this news organization.

In earlier work, these researchers investigated how antibiotics target bacterial membranes and how those membranes enable the development of antibiotic resistance. Then, they said, “we started to ... manipulate membranes by tuning their properties [with] synthetic lipid molecules to create ‘hybrid’ membranes – that is, functionalized biological membranes with optimized properties.

“We are now using this approach to functionalize red blood cells by using them as drug carriers. We optimize these cells to carry certain loads, such as drug molecules, and anchor proteins in their membranes that target receptors in bacteria to selectively and efficiently deliver that load.”

The strategy, they said, “has become a universal red blood cell–based delivery platform that we call ‘smart blood’ ... that can safely and selectively deliver antibiotics to certain bacterial targets.”

The platform currently is being tested in vitro, and in vivo testing is slated to begin in early 2023. Their study was published online in ACS Infectious Diseases.
 

Optimizing dosing

Polymyxin B (PmB) is one of a few potent antibiotics with promising efficacy against drug-resistant bacteria such as E. coli. PmB, however, is widely considered a treatment of last resort because of its toxic side effects (which include nephrotoxicity, neurotoxicity, and neuromuscular blockade) particularly at higher doses.

The researchers hypothesized that targeted delivery of PmB might lead to optimized dosing and potentially reduce the need for higher or repeated doses. In the current study, they tested the ability of the smart blood platform to deliver PmB to E. coli.

Creating “erythro-PmBs” involves removing the inner components of red blood cells, loading the cells with PmB, and coating the cell membranes (liposomes) with antibacterial (in this case, anti–E. coli) antibodies.

The in vitro experiments showed that the cells could be loaded with PmB and retain and selectively deliver the drug to E. coli, with no apparent hemolytic activity or nephrotoxicity. Specifically, the erythro-PmBs had a loading efficiency of approximately 90% and delivered PmB to E. coli with values for the minimum inhibitory concentration that were comparable with those of free PmB.

“In contrast to drug-delivery systems based on synthetic carriers, our erythrocytes have a high biocompatibility and can stay in circulation in the body for several weeks to provide a sustained and targeted release of the drug,” said Ms. Krivić and Dr. Rheinstädter. “This [profile] can make existing drugs safer by, for instance, increasing their efficacy while at the same time lowering the required dosage, thereby reducing side effects.”

The researchers are now exploring the ability of the smart blood platform to deliver neurotrophic factors across the blood-brain barrier to potentially treat neurodegenerative diseases. Their approach is identical to that used in the current study, they said, except in this case, the red blood cell membranes are designed to deliver neurotrophic factors specifically to the blood-brain barrier.
 

‘Certainly promising’

David W. Deamer, PhD, research professor of biomolecular engineering at the University of California, Santa Cruz, said in a comment: “This is certainly promising. The erythro-PmBs have a greater loading capacity and longer circulation time than ordinary liposomes used for drug delivery. They can also be prepared with specific antibodies so that the antibiotic is delivered more directly when they bind to bacterial pathogens.”

The effect on bacterial growth, however, was tested in a model system, not in an actual infection, he said, adding that an important next step will be to perform animal testing. “One of the simplest tests is induced sepsis in mice, which mimics a burst appendix. If the erythro-PmBs can treat sepsis effectively, it will be an encouraging sign that they have potential therapeutic value. It will also be interesting to see whether the antigens responsible for ABO blood groups are retained on the surfaces of the erythro-PmBs. If they are, it might be necessary to match donor blood to that of the recipient.

“Getting a product ready for clinical use will require partnership with a major pharmaceutical firm, several years of animal testing, and then several more years carrying out phase 1, 2, and 3 clinical trials in human patients,” Dr. Deamer concluded. 

No commercial funding was disclosed. Ms. Krivić, Dr. Rheinstädter, and Dr. Deamer reported no conflicts of interest.

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

A red blood cell–based platform delivered a potent antibiotic targeted to Escherichia coli in a preclinical trial.

Over several years, “we developed experimental and computational techniques to study how proteins and drugs interact with membranes,” Hannah Krivić, a graduate student, and Maikel C. Rheinstädter, PhD, a professor of physics, both at McMaster University in Hamilton, Ont., told this news organization.

In earlier work, these researchers investigated how antibiotics target bacterial membranes and how those membranes enable the development of antibiotic resistance. Then, they said, “we started to ... manipulate membranes by tuning their properties [with] synthetic lipid molecules to create ‘hybrid’ membranes – that is, functionalized biological membranes with optimized properties.

“We are now using this approach to functionalize red blood cells by using them as drug carriers. We optimize these cells to carry certain loads, such as drug molecules, and anchor proteins in their membranes that target receptors in bacteria to selectively and efficiently deliver that load.”

The strategy, they said, “has become a universal red blood cell–based delivery platform that we call ‘smart blood’ ... that can safely and selectively deliver antibiotics to certain bacterial targets.”

The platform currently is being tested in vitro, and in vivo testing is slated to begin in early 2023. Their study was published online in ACS Infectious Diseases.
 

Optimizing dosing

Polymyxin B (PmB) is one of a few potent antibiotics with promising efficacy against drug-resistant bacteria such as E. coli. PmB, however, is widely considered a treatment of last resort because of its toxic side effects (which include nephrotoxicity, neurotoxicity, and neuromuscular blockade) particularly at higher doses.

The researchers hypothesized that targeted delivery of PmB might lead to optimized dosing and potentially reduce the need for higher or repeated doses. In the current study, they tested the ability of the smart blood platform to deliver PmB to E. coli.

Creating “erythro-PmBs” involves removing the inner components of red blood cells, loading the cells with PmB, and coating the cell membranes (liposomes) with antibacterial (in this case, anti–E. coli) antibodies.

The in vitro experiments showed that the cells could be loaded with PmB and retain and selectively deliver the drug to E. coli, with no apparent hemolytic activity or nephrotoxicity. Specifically, the erythro-PmBs had a loading efficiency of approximately 90% and delivered PmB to E. coli with values for the minimum inhibitory concentration that were comparable with those of free PmB.

“In contrast to drug-delivery systems based on synthetic carriers, our erythrocytes have a high biocompatibility and can stay in circulation in the body for several weeks to provide a sustained and targeted release of the drug,” said Ms. Krivić and Dr. Rheinstädter. “This [profile] can make existing drugs safer by, for instance, increasing their efficacy while at the same time lowering the required dosage, thereby reducing side effects.”

The researchers are now exploring the ability of the smart blood platform to deliver neurotrophic factors across the blood-brain barrier to potentially treat neurodegenerative diseases. Their approach is identical to that used in the current study, they said, except in this case, the red blood cell membranes are designed to deliver neurotrophic factors specifically to the blood-brain barrier.
 

‘Certainly promising’

David W. Deamer, PhD, research professor of biomolecular engineering at the University of California, Santa Cruz, said in a comment: “This is certainly promising. The erythro-PmBs have a greater loading capacity and longer circulation time than ordinary liposomes used for drug delivery. They can also be prepared with specific antibodies so that the antibiotic is delivered more directly when they bind to bacterial pathogens.”

The effect on bacterial growth, however, was tested in a model system, not in an actual infection, he said, adding that an important next step will be to perform animal testing. “One of the simplest tests is induced sepsis in mice, which mimics a burst appendix. If the erythro-PmBs can treat sepsis effectively, it will be an encouraging sign that they have potential therapeutic value. It will also be interesting to see whether the antigens responsible for ABO blood groups are retained on the surfaces of the erythro-PmBs. If they are, it might be necessary to match donor blood to that of the recipient.

“Getting a product ready for clinical use will require partnership with a major pharmaceutical firm, several years of animal testing, and then several more years carrying out phase 1, 2, and 3 clinical trials in human patients,” Dr. Deamer concluded. 

No commercial funding was disclosed. Ms. Krivić, Dr. Rheinstädter, and Dr. Deamer reported no conflicts of interest.

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

Heart failure (HF) patients with high serum levels of alpha-linolenic acid (ALA) had a better prognosis than those with the lowest levels, in an observational study.

ALA is an omega-3 fatty acid that is found mainly in plants, including flaxseed, chia, walnuts, or canola oil.

PxHere

Plant power

Dr. Sala-Vila and colleagues analyzed data and samples from 905 patients (mean age, 67; 32% women) with HF of different etiologies. ALA was assessed by gas chromatography in serum phospholipids, which reflect long-term dietary ALA intake and metabolism.

The primary outcome was a composite of all-cause death or first HF hospitalization. The secondary outcome was the composite of CV death or HF hospitalization.

After a median follow-up of 2.4 years, 140 all-cause deaths, 85 CV deaths, and 141 first HF hospitalizations occurred (composite of all-cause death and first HF hospitalization, 238; composite of CV death and HF hospitalization, 184).

Compared with patients at the lowest quartile of ALA in serum phospholipids, those at the three upper quartiles showed a 39% reduction in the risk of the primary endpoint (hazard ratio, 0.61).

Statistically significant reductions also were observed for all-cause death (HR, 0.58), CV death (HR, 0.51), first HF hospitalization (HR, 0.58), and the composite of CV death and HF hospitalization (HR, 0.58).

By contrast, nonstatistically significant associations were seen for fish-derived EPA, DHA, and the sum of EPA + DHA.

Limitations of the study include its observational nature; a relatively young cohort with reduced or mid-range ejection fraction and stage 2 chronic kidney disease; and no dietary data except for those regarding fatty acids.

“Controversial results from landmark recent trials on omega-3 might have translated into confusion/negative impact on the reputation of these fatty acids,” Dr. Sala-Vila noted. “Many factors affect how each participant responds to a certain intervention (precision nutrition), such as genetics, the microbiome, and the environment. In this regard, nutritional status – omega-3 background – is emerging as a key determinant.”
 

Randomized trials needed

JoAnn E. Manson, MD, MPH, DrPH, chief of the Division of Preventive Medicine at Brigham and Women’s Hospital, Boston, said the findings “are promising in the context of earlier research on omega-3s.”

Those studies include the landmark GISSI-HF trial, a randomized, controlled trial (RCT) that showed a small benefit of n-3 polyunsaturated fatty acids regarding hospital admissions and mortality among patients with chronic HF, and her team’s VITAL-HF study, which showed a significant reduction in recurrent HF hospitalization with marine omega-3 supplementation versus placebo.

“This may not be a causal association, and the authors acknowledge that they don’t have information on other dietary factors,” Dr. Manson said. “It may be that the foods that are leading to this higher blood level of ALA comprise the type of plant-based diet that’s been linked to lower risk of CVD, such as the Mediterranean diet. The findings also could be the result of other factors that aren’t fully controlled for in the analysis, or the participants could be more compliant with their medications.”

Nevertheless, she said, “it’s reasonable to recommend that people with a history of HF or who are at high risk of HF increase their intake of ALA-enriched foods, including canola oil, flaxseed oils, soybeans and soybean oils, and walnuts.”

“I think the evidence is promising enough that an RCT of ALA in people with heart failure also would be reasonable,” she added.

Similarly, Abdallah Al-Mohammad, MD, of Northern General Hospital, Sheffield, England, writes in a related editorial that while a potential role for ALA in improving morbidity and mortality in HF patients cannot be substantiated yet, the findings “open the field to more questions” for which “the judge and jury ... shall be prospective randomized controlled trials.”

No commercial funding or relevant conflicts of interest were declared.

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

Heart failure (HF) patients with high serum levels of alpha-linolenic acid (ALA) had a better prognosis than those with the lowest levels, in an observational study.

ALA is an omega-3 fatty acid that is found mainly in plants, including flaxseed, chia, walnuts, or canola oil.

PxHere

Plant power

Dr. Sala-Vila and colleagues analyzed data and samples from 905 patients (mean age, 67; 32% women) with HF of different etiologies. ALA was assessed by gas chromatography in serum phospholipids, which reflect long-term dietary ALA intake and metabolism.

The primary outcome was a composite of all-cause death or first HF hospitalization. The secondary outcome was the composite of CV death or HF hospitalization.

After a median follow-up of 2.4 years, 140 all-cause deaths, 85 CV deaths, and 141 first HF hospitalizations occurred (composite of all-cause death and first HF hospitalization, 238; composite of CV death and HF hospitalization, 184).

Compared with patients at the lowest quartile of ALA in serum phospholipids, those at the three upper quartiles showed a 39% reduction in the risk of the primary endpoint (hazard ratio, 0.61).

Statistically significant reductions also were observed for all-cause death (HR, 0.58), CV death (HR, 0.51), first HF hospitalization (HR, 0.58), and the composite of CV death and HF hospitalization (HR, 0.58).

By contrast, nonstatistically significant associations were seen for fish-derived EPA, DHA, and the sum of EPA + DHA.

Limitations of the study include its observational nature; a relatively young cohort with reduced or mid-range ejection fraction and stage 2 chronic kidney disease; and no dietary data except for those regarding fatty acids.

“Controversial results from landmark recent trials on omega-3 might have translated into confusion/negative impact on the reputation of these fatty acids,” Dr. Sala-Vila noted. “Many factors affect how each participant responds to a certain intervention (precision nutrition), such as genetics, the microbiome, and the environment. In this regard, nutritional status – omega-3 background – is emerging as a key determinant.”
 

Randomized trials needed

JoAnn E. Manson, MD, MPH, DrPH, chief of the Division of Preventive Medicine at Brigham and Women’s Hospital, Boston, said the findings “are promising in the context of earlier research on omega-3s.”

Those studies include the landmark GISSI-HF trial, a randomized, controlled trial (RCT) that showed a small benefit of n-3 polyunsaturated fatty acids regarding hospital admissions and mortality among patients with chronic HF, and her team’s VITAL-HF study, which showed a significant reduction in recurrent HF hospitalization with marine omega-3 supplementation versus placebo.

“This may not be a causal association, and the authors acknowledge that they don’t have information on other dietary factors,” Dr. Manson said. “It may be that the foods that are leading to this higher blood level of ALA comprise the type of plant-based diet that’s been linked to lower risk of CVD, such as the Mediterranean diet. The findings also could be the result of other factors that aren’t fully controlled for in the analysis, or the participants could be more compliant with their medications.”

Nevertheless, she said, “it’s reasonable to recommend that people with a history of HF or who are at high risk of HF increase their intake of ALA-enriched foods, including canola oil, flaxseed oils, soybeans and soybean oils, and walnuts.”

“I think the evidence is promising enough that an RCT of ALA in people with heart failure also would be reasonable,” she added.

Similarly, Abdallah Al-Mohammad, MD, of Northern General Hospital, Sheffield, England, writes in a related editorial that while a potential role for ALA in improving morbidity and mortality in HF patients cannot be substantiated yet, the findings “open the field to more questions” for which “the judge and jury ... shall be prospective randomized controlled trials.”

No commercial funding or relevant conflicts of interest were declared.

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

Heart failure (HF) patients with high serum levels of alpha-linolenic acid (ALA) had a better prognosis than those with the lowest levels, in an observational study.

ALA is an omega-3 fatty acid that is found mainly in plants, including flaxseed, chia, walnuts, or canola oil.

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Plant power

Dr. Sala-Vila and colleagues analyzed data and samples from 905 patients (mean age, 67; 32% women) with HF of different etiologies. ALA was assessed by gas chromatography in serum phospholipids, which reflect long-term dietary ALA intake and metabolism.

The primary outcome was a composite of all-cause death or first HF hospitalization. The secondary outcome was the composite of CV death or HF hospitalization.

After a median follow-up of 2.4 years, 140 all-cause deaths, 85 CV deaths, and 141 first HF hospitalizations occurred (composite of all-cause death and first HF hospitalization, 238; composite of CV death and HF hospitalization, 184).

Compared with patients at the lowest quartile of ALA in serum phospholipids, those at the three upper quartiles showed a 39% reduction in the risk of the primary endpoint (hazard ratio, 0.61).

Statistically significant reductions also were observed for all-cause death (HR, 0.58), CV death (HR, 0.51), first HF hospitalization (HR, 0.58), and the composite of CV death and HF hospitalization (HR, 0.58).

By contrast, nonstatistically significant associations were seen for fish-derived EPA, DHA, and the sum of EPA + DHA.

Limitations of the study include its observational nature; a relatively young cohort with reduced or mid-range ejection fraction and stage 2 chronic kidney disease; and no dietary data except for those regarding fatty acids.

“Controversial results from landmark recent trials on omega-3 might have translated into confusion/negative impact on the reputation of these fatty acids,” Dr. Sala-Vila noted. “Many factors affect how each participant responds to a certain intervention (precision nutrition), such as genetics, the microbiome, and the environment. In this regard, nutritional status – omega-3 background – is emerging as a key determinant.”
 

Randomized trials needed

JoAnn E. Manson, MD, MPH, DrPH, chief of the Division of Preventive Medicine at Brigham and Women’s Hospital, Boston, said the findings “are promising in the context of earlier research on omega-3s.”

Those studies include the landmark GISSI-HF trial, a randomized, controlled trial (RCT) that showed a small benefit of n-3 polyunsaturated fatty acids regarding hospital admissions and mortality among patients with chronic HF, and her team’s VITAL-HF study, which showed a significant reduction in recurrent HF hospitalization with marine omega-3 supplementation versus placebo.

“This may not be a causal association, and the authors acknowledge that they don’t have information on other dietary factors,” Dr. Manson said. “It may be that the foods that are leading to this higher blood level of ALA comprise the type of plant-based diet that’s been linked to lower risk of CVD, such as the Mediterranean diet. The findings also could be the result of other factors that aren’t fully controlled for in the analysis, or the participants could be more compliant with their medications.”

Nevertheless, she said, “it’s reasonable to recommend that people with a history of HF or who are at high risk of HF increase their intake of ALA-enriched foods, including canola oil, flaxseed oils, soybeans and soybean oils, and walnuts.”

“I think the evidence is promising enough that an RCT of ALA in people with heart failure also would be reasonable,” she added.

Similarly, Abdallah Al-Mohammad, MD, of Northern General Hospital, Sheffield, England, writes in a related editorial that while a potential role for ALA in improving morbidity and mortality in HF patients cannot be substantiated yet, the findings “open the field to more questions” for which “the judge and jury ... shall be prospective randomized controlled trials.”

No commercial funding or relevant conflicts of interest were declared.

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

Cardiovascular health (CVH) scores that include sleep predicted CV disease risk among older U.S. adults, supporting the American Heart Association’s recent inclusion of sleep in its own checklist.

Sleep duration is now considered “an essential component for ideal heart and brain health,” according to the AHA’s updated checklist, now called Life’s Essential 8. “Our study is the first to show that sleep metrics add independent predictive value for CVD events over and above the original seven cardiovascular health metrics, providing support for updating the guidelines from Life’s Simple 7 (LS7) to Life’s Essential 8,” lead author Nour Makarem, PhD, of the Mailman School of Public Health at Columbia University Irving Medical Center, New York, said in an interview.

For the study, her team compared four versions of LS7 checklists that included sleep in relation to cardiovascular disease (CVD) risk.

“CVH scores that included sleep duration alone as a measure of overall sleep health, as well as scores that included multiple dimensions of sleep health (that is, sleep duration, efficiency, and regularity, daytime sleepiness, and sleep disorders), were both predictive of future CVD,” she said.

Study participants scoring in the highest tertile of the CVH checklists that included sleep had up to a 47% lower CVD risk.

Sleeping 7 hours or more but less than 9 hours nightly was considered “ideal,” according to the study, which was published online  in the Journal of the American Heart Association.
 

Lower the odds

Dr. Makarem and colleagues analyzed data from participants in the Multi-Ethnic Study of Atherosclerosis (MESA) sleep study using overnight polysomnography, 7-day wrist actigraphy, validated questionnaires, and outcomes. They used the data to evaluate the four iterations of an expanded LS7 score:

• Score 1 included sleep duration;
• Score 2 included sleep characteristics linked to CVD in the literature (sleep duration, insomnia, daytime sleepiness, and obstructive sleep apnea [OSA]);
• Score 3 included sleep characteristics associated with CVD in MESA (sleep duration and efficiency, daytime sleepiness, and OSA); and
• Score 4, also based on CVD in MESA, included sleep regularity.

Among 1,920 participants (mean age 69 years; 54% women; 40%, White individuals), the mean LS7 score was 7.3, and the means of the alternate CVH scores that included sleep ranged from 7.4 to 7.8 (scores range from 0 to 14, with higher scores indicating better CVH).

On actigraphy, 63% of participants slept less than 7 hours; 30% slept less than 6 hours; 39% had high night-to-night variability in sleep duration; and 25% had high variability in sleep onset timing.

Overall, 10% had sleep efficiency less than 85%; 14% had excessive daytime sleepiness; 36% had high insomnia symptoms; and 47% had moderate to severe OSA. Short-duration sleepers also had a higher prevalence of overweight/obesity, diabetes, and hypertension and had lower mean LS7 scores.

During a mean follow-up of 4.4 years, 95 prevalent CVD events and 93 incident cases occurred.

Higher scores on all four expanded versions were related to lower odds of having CVD. Participants in the highest versus the lowest tertile of the LS7 score had 75% lower CVD odds (odds ratio, 0.25). Similarly, those in the highest versus the lowest tertile of CVH scores 1 and 2 had 71% and 80% lower odds of prevalent CVD (OR, 0.29 and OR, 0.20), respectively.

Overall, participants in the highest versus lowest tertile of the LS7 score and all CVH scores had up to 80% lower odds of prevalent CVD; those in the highest versus lowest tertile of CVH score 1, which included sleep duration, and CVH score 4, which included multidimensional sleep health, had 43% and 47% lower incident CVD risk (hazard ratios, 0.57 and 0.53), respectively.

The LS7 score alone was not significantly associated with CVD incidence (HR, 0.62).

“Clinicians should ask patients about their sleep health and emphasize the importance of prioritizing sleep for heart disease prevention,” Dr. Makarem said.
 

Sleep ‘devalued’

“The sleep field has been fighting to get more sleep education into medical education for decades,” AHA volunteer expert Michael A. Grandner, PhD, Director of the Sleep & Health Research Program and of the Behavioral Sleep Medicine Clinic at the University of Arizona College of Medicine, Tucson, said in an interview.

“To my knowledge, there still is not a lot of attention given to it, partly because the culture in medical school and among residents is one of not sleeping,” said Dr. Grandner, who was not involved in the study. “The culture among physicians is ‘Who needs sleep? I function fine without it.’ ”

“Sleep made it to the checklist because it is a biological requirement for human life,” he noted. “We sleep for the same reason we breathe and drink. It’s an imperative. Yet we live in a society that devalues sleep.”

It’s “extremely unusual” for a doctor to ask a patient how they’re sleeping, he said. “It’s also pretty unusual to have sleep-related conversations between doctors and patients, especially in the context of health, not just, ‘Hey, doc, I can’t sleep, throw me a pill.’”

Clinicians should be asking every patient about how they’re sleeping at every visit, Dr. Grandner said. “It’s now part of the official definition of heart health. Just like you would be remiss if you didn’t ask about smoking or test blood pressure, you’d be missing something important by not asking about sleep – something that has similar billing to diet, exercise, blood pressure, and all the other ‘essentials.’ ”

No commercial funding or conflicts of interest were declared.

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

Cardiovascular health (CVH) scores that include sleep predicted CV disease risk among older U.S. adults, supporting the American Heart Association’s recent inclusion of sleep in its own checklist.

Sleep duration is now considered “an essential component for ideal heart and brain health,” according to the AHA’s updated checklist, now called Life’s Essential 8. “Our study is the first to show that sleep metrics add independent predictive value for CVD events over and above the original seven cardiovascular health metrics, providing support for updating the guidelines from Life’s Simple 7 (LS7) to Life’s Essential 8,” lead author Nour Makarem, PhD, of the Mailman School of Public Health at Columbia University Irving Medical Center, New York, said in an interview.

For the study, her team compared four versions of LS7 checklists that included sleep in relation to cardiovascular disease (CVD) risk.

“CVH scores that included sleep duration alone as a measure of overall sleep health, as well as scores that included multiple dimensions of sleep health (that is, sleep duration, efficiency, and regularity, daytime sleepiness, and sleep disorders), were both predictive of future CVD,” she said.

Study participants scoring in the highest tertile of the CVH checklists that included sleep had up to a 47% lower CVD risk.

Sleeping 7 hours or more but less than 9 hours nightly was considered “ideal,” according to the study, which was published online  in the Journal of the American Heart Association.
 

Lower the odds

Dr. Makarem and colleagues analyzed data from participants in the Multi-Ethnic Study of Atherosclerosis (MESA) sleep study using overnight polysomnography, 7-day wrist actigraphy, validated questionnaires, and outcomes. They used the data to evaluate the four iterations of an expanded LS7 score:

• Score 1 included sleep duration;
• Score 2 included sleep characteristics linked to CVD in the literature (sleep duration, insomnia, daytime sleepiness, and obstructive sleep apnea [OSA]);
• Score 3 included sleep characteristics associated with CVD in MESA (sleep duration and efficiency, daytime sleepiness, and OSA); and
• Score 4, also based on CVD in MESA, included sleep regularity.

Among 1,920 participants (mean age 69 years; 54% women; 40%, White individuals), the mean LS7 score was 7.3, and the means of the alternate CVH scores that included sleep ranged from 7.4 to 7.8 (scores range from 0 to 14, with higher scores indicating better CVH).

On actigraphy, 63% of participants slept less than 7 hours; 30% slept less than 6 hours; 39% had high night-to-night variability in sleep duration; and 25% had high variability in sleep onset timing.

Overall, 10% had sleep efficiency less than 85%; 14% had excessive daytime sleepiness; 36% had high insomnia symptoms; and 47% had moderate to severe OSA. Short-duration sleepers also had a higher prevalence of overweight/obesity, diabetes, and hypertension and had lower mean LS7 scores.

During a mean follow-up of 4.4 years, 95 prevalent CVD events and 93 incident cases occurred.

Higher scores on all four expanded versions were related to lower odds of having CVD. Participants in the highest versus the lowest tertile of the LS7 score had 75% lower CVD odds (odds ratio, 0.25). Similarly, those in the highest versus the lowest tertile of CVH scores 1 and 2 had 71% and 80% lower odds of prevalent CVD (OR, 0.29 and OR, 0.20), respectively.

Overall, participants in the highest versus lowest tertile of the LS7 score and all CVH scores had up to 80% lower odds of prevalent CVD; those in the highest versus lowest tertile of CVH score 1, which included sleep duration, and CVH score 4, which included multidimensional sleep health, had 43% and 47% lower incident CVD risk (hazard ratios, 0.57 and 0.53), respectively.

The LS7 score alone was not significantly associated with CVD incidence (HR, 0.62).

“Clinicians should ask patients about their sleep health and emphasize the importance of prioritizing sleep for heart disease prevention,” Dr. Makarem said.
 

Sleep ‘devalued’

“The sleep field has been fighting to get more sleep education into medical education for decades,” AHA volunteer expert Michael A. Grandner, PhD, Director of the Sleep & Health Research Program and of the Behavioral Sleep Medicine Clinic at the University of Arizona College of Medicine, Tucson, said in an interview.

“To my knowledge, there still is not a lot of attention given to it, partly because the culture in medical school and among residents is one of not sleeping,” said Dr. Grandner, who was not involved in the study. “The culture among physicians is ‘Who needs sleep? I function fine without it.’ ”

“Sleep made it to the checklist because it is a biological requirement for human life,” he noted. “We sleep for the same reason we breathe and drink. It’s an imperative. Yet we live in a society that devalues sleep.”

It’s “extremely unusual” for a doctor to ask a patient how they’re sleeping, he said. “It’s also pretty unusual to have sleep-related conversations between doctors and patients, especially in the context of health, not just, ‘Hey, doc, I can’t sleep, throw me a pill.’”

Clinicians should be asking every patient about how they’re sleeping at every visit, Dr. Grandner said. “It’s now part of the official definition of heart health. Just like you would be remiss if you didn’t ask about smoking or test blood pressure, you’d be missing something important by not asking about sleep – something that has similar billing to diet, exercise, blood pressure, and all the other ‘essentials.’ ”

No commercial funding or conflicts of interest were declared.

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

Cardiovascular health (CVH) scores that include sleep predicted CV disease risk among older U.S. adults, supporting the American Heart Association’s recent inclusion of sleep in its own checklist.

Sleep duration is now considered “an essential component for ideal heart and brain health,” according to the AHA’s updated checklist, now called Life’s Essential 8. “Our study is the first to show that sleep metrics add independent predictive value for CVD events over and above the original seven cardiovascular health metrics, providing support for updating the guidelines from Life’s Simple 7 (LS7) to Life’s Essential 8,” lead author Nour Makarem, PhD, of the Mailman School of Public Health at Columbia University Irving Medical Center, New York, said in an interview.

For the study, her team compared four versions of LS7 checklists that included sleep in relation to cardiovascular disease (CVD) risk.

“CVH scores that included sleep duration alone as a measure of overall sleep health, as well as scores that included multiple dimensions of sleep health (that is, sleep duration, efficiency, and regularity, daytime sleepiness, and sleep disorders), were both predictive of future CVD,” she said.

Study participants scoring in the highest tertile of the CVH checklists that included sleep had up to a 47% lower CVD risk.

Sleeping 7 hours or more but less than 9 hours nightly was considered “ideal,” according to the study, which was published online  in the Journal of the American Heart Association.
 

Lower the odds

Dr. Makarem and colleagues analyzed data from participants in the Multi-Ethnic Study of Atherosclerosis (MESA) sleep study using overnight polysomnography, 7-day wrist actigraphy, validated questionnaires, and outcomes. They used the data to evaluate the four iterations of an expanded LS7 score:

• Score 1 included sleep duration;
• Score 2 included sleep characteristics linked to CVD in the literature (sleep duration, insomnia, daytime sleepiness, and obstructive sleep apnea [OSA]);
• Score 3 included sleep characteristics associated with CVD in MESA (sleep duration and efficiency, daytime sleepiness, and OSA); and
• Score 4, also based on CVD in MESA, included sleep regularity.

Among 1,920 participants (mean age 69 years; 54% women; 40%, White individuals), the mean LS7 score was 7.3, and the means of the alternate CVH scores that included sleep ranged from 7.4 to 7.8 (scores range from 0 to 14, with higher scores indicating better CVH).

On actigraphy, 63% of participants slept less than 7 hours; 30% slept less than 6 hours; 39% had high night-to-night variability in sleep duration; and 25% had high variability in sleep onset timing.

Overall, 10% had sleep efficiency less than 85%; 14% had excessive daytime sleepiness; 36% had high insomnia symptoms; and 47% had moderate to severe OSA. Short-duration sleepers also had a higher prevalence of overweight/obesity, diabetes, and hypertension and had lower mean LS7 scores.

During a mean follow-up of 4.4 years, 95 prevalent CVD events and 93 incident cases occurred.

Higher scores on all four expanded versions were related to lower odds of having CVD. Participants in the highest versus the lowest tertile of the LS7 score had 75% lower CVD odds (odds ratio, 0.25). Similarly, those in the highest versus the lowest tertile of CVH scores 1 and 2 had 71% and 80% lower odds of prevalent CVD (OR, 0.29 and OR, 0.20), respectively.

Overall, participants in the highest versus lowest tertile of the LS7 score and all CVH scores had up to 80% lower odds of prevalent CVD; those in the highest versus lowest tertile of CVH score 1, which included sleep duration, and CVH score 4, which included multidimensional sleep health, had 43% and 47% lower incident CVD risk (hazard ratios, 0.57 and 0.53), respectively.

The LS7 score alone was not significantly associated with CVD incidence (HR, 0.62).

“Clinicians should ask patients about their sleep health and emphasize the importance of prioritizing sleep for heart disease prevention,” Dr. Makarem said.
 

Sleep ‘devalued’

“The sleep field has been fighting to get more sleep education into medical education for decades,” AHA volunteer expert Michael A. Grandner, PhD, Director of the Sleep & Health Research Program and of the Behavioral Sleep Medicine Clinic at the University of Arizona College of Medicine, Tucson, said in an interview.

“To my knowledge, there still is not a lot of attention given to it, partly because the culture in medical school and among residents is one of not sleeping,” said Dr. Grandner, who was not involved in the study. “The culture among physicians is ‘Who needs sleep? I function fine without it.’ ”

“Sleep made it to the checklist because it is a biological requirement for human life,” he noted. “We sleep for the same reason we breathe and drink. It’s an imperative. Yet we live in a society that devalues sleep.”

It’s “extremely unusual” for a doctor to ask a patient how they’re sleeping, he said. “It’s also pretty unusual to have sleep-related conversations between doctors and patients, especially in the context of health, not just, ‘Hey, doc, I can’t sleep, throw me a pill.’”

Clinicians should be asking every patient about how they’re sleeping at every visit, Dr. Grandner said. “It’s now part of the official definition of heart health. Just like you would be remiss if you didn’t ask about smoking or test blood pressure, you’d be missing something important by not asking about sleep – something that has similar billing to diet, exercise, blood pressure, and all the other ‘essentials.’ ”

No commercial funding or conflicts of interest were declared.

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

The authors of a new evidence review recommend the Canadian TIA Risk Score for managing patients who present to the emergency department or physician’s office with an apparent transient ischemic attack (TIA) or minor stroke.

“Many hospitals do not have enough stroke neurologists to see every patient with TIA or minor stroke within 24 hours. Likewise, many emergency departments around the world are stretched beyond capacity,” study author Jeffery J. Perry, MD, senior scientist at the Ottawa Hospital Research Institute, said in an interview.

“This review corresponds to most of the recommendations by the American Heart Association and the Canadian Stroke Best Practice Recommendations,” he said. “It does, however, go further to differentiate high-risk versus low-risk patients for subsequent stroke using the Canadian TIA Score and offers practical suggestions for how to provide high-quality care in environments without the capacity to provide immediate vascular imaging, immediate MRI scanning, and immediate stroke specialist assessments.”

Most patients at low risk of a subsequent stroke (that is, patients with < 1% risk for a subsequent stroke at 7 days) can be managed safely as outpatients without causing delays in their departure for vascular imaging or neurology consultation during their initial emergency department visits, Dr. Perry added. “The Canadian TIA Score can be used to determine the urgency for an assessment by a stroke neurologist.”

The study was published  in CMAJ.
 

Score stratifies risk

Dr. Perry, lead author of the Canadian TIA Score validation study, said that the CMAJ editorial board approached him to write the review and to incorporate the new score into the latest recommendations. To include the latest evidence, Dr. Perry and colleagues reviewed the most recent position statements on TIA and minor stroke management and searched the literature for relevant articles. They note that the nomenclature related to TIA and minor stroke is inconsistent, that it’s not necessary to differentiate between the two from a clinical standpoint, and that the term “acute ischemic cerebrovascular syndrome” has been proposed to include both.

Broadly, the team’s recommended strategy for the diagnosis and management of the condition includes the following steps:

• Diagnosis: Sudden loss of motor function and impaired speech are strong indicators; symptoms tend to be negative (for example, loss of vision rather than flashing lights).
• Risk assessment: Use of the Canadian TIA Score to stratify 7-day stroke risk (low risk: < 1%, medium risk: 1%-5%, high risk: > 5%).
• Investigations: Urgent CT within 48 hours; vascular imaging to identify acutely symptomatic carotid stenosis in medium- to high-risk patients, as determined on the basis of the TIA score; ECG to identify atrial fibrillation or flutter and to optimize anticoagulant use; if the index of suspicion is high, echocardiography should be employed to look for cardioembolic sources.
• Management: Dual antiplatelet therapy for 21 days in medium- and high-risk patients; hypertension should be managed; patients should be referred for stroke clinic assessment; aggressive lifestyle changes should be initiated to lower lipid levels.

“I believe that our recommendations should be incorporated with the clinical guidelines,” said Dr. Perry.
 

Caveats and concerns

Commenting on the article, Steven M. Greenberg, MD, PhD, vice chair for faculty development of the department of neurology at Massachusetts General Hospital and a professor of neurology at Harvard Medical School, both in Boston, said, “Although the proposed guidelines are broadly evidence-based and consistent with standard of care, there are several areas where stroke specialists might disagree and suggest alternative strategies.” Dr. Greenberg was not involved in the study.

While some lower-risk features, such as repetitive or stereotyped symptoms or vertigo, can be more suggestive of TIA mimics, he said that “these features need to be scrutinized quite carefully. Critical carotid stenosis, for example, can give rise to brief, repetitive, stereotyped low-flow TIAs that require urgent revascularization.”

Vertigo might be a feature of brainstem or cerebellar TIA or minor stroke, said Dr. Greenberg, especially in the setting of other posterior circulation symptoms. Validated guidelines for differentiating peripheral vertigo and CNS vertigo are available, he noted.

“Another caveat is that the studies demonstrating benefit of brief dual antiplatelet therapy following acute TIA or minor stroke were based on ABCD2 rather than the Canadian TIA score,” he said. “It is therefore important for any score-based recommendations to be applied in the overall context of existing stroke prevention guidelines.”

In addition to the recommendation for urgent vascular imaging of patients whose presentations suggest bona fide TIA or minor stroke, most guidelines also recommend extended cardiac monitoring and transthoracic ECG to identify potential sources of embolism, Dr. Greenberg added. “Users of these guidelines should also be aware of the limited yield of head CT, which is able to detect some old strokes, large acute strokes – presumably not relevant to patients presenting with TIA or minor stroke – and acute intracranial hemorrhages.”

Louis R. Caplan, MD, founder of the Harvard Stroke Registry at Beth Israel Deaconess Medical Center, Boston, and a professor of neurology at Harvard Medical School, also commented on the study.

While the review “is okay for care by nonstroke specialists, ideally, major referral centers could have a TIA or stroke clinic, as is present in much of Western Europe,” he said. This would allow the stroke etiology to be investigated for each patient.

“Many patients can be treated with the regimen outlined by the authors, but some with other conditions, such as atrial cardiopathy, patent foramen ovale, atrial myxoma, thrombus within the cardiac ventricle or atrium, will require anticoagulants,” he noted. “Thrombolysis and mechanical thrombectomy would be considered in some. Each stroke patient is different, and management cannot be homogenized into one remedy. One size does not fit all.”

In an accompanying commentary, Shelagh B. Coutts, MD, and Michael D. Hill, MD, both of the University of Calgary (Alta.), presented their team’s approach to the acute management of patients with likely cerebral ischemia. Such management includes risk assessment and stratification by clinical symptoms, rather than a particular score. They also typically conduct CT angiography. “If the CTA is completely normal (that is, no occlusion, no atherosclerosis or arterial dissection and no other vascular abnormality), we rely on the high negative predictive value of this result and discharge the patient home on antiplatelet treatment with outpatient follow-up, including MRI of the brain (since CT cannot reliably rule out minor ischemia) within the first week,” they write.

The review was conducted without commercial funding. Dr. Perry, Dr. Greenberg, Dr. Caplan, Dr. Coutts, and Dr. Hill have disclosed no relevant financial relationships.

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

The authors of a new evidence review recommend the Canadian TIA Risk Score for managing patients who present to the emergency department or physician’s office with an apparent transient ischemic attack (TIA) or minor stroke.

“Many hospitals do not have enough stroke neurologists to see every patient with TIA or minor stroke within 24 hours. Likewise, many emergency departments around the world are stretched beyond capacity,” study author Jeffery J. Perry, MD, senior scientist at the Ottawa Hospital Research Institute, said in an interview.

“This review corresponds to most of the recommendations by the American Heart Association and the Canadian Stroke Best Practice Recommendations,” he said. “It does, however, go further to differentiate high-risk versus low-risk patients for subsequent stroke using the Canadian TIA Score and offers practical suggestions for how to provide high-quality care in environments without the capacity to provide immediate vascular imaging, immediate MRI scanning, and immediate stroke specialist assessments.”

Most patients at low risk of a subsequent stroke (that is, patients with < 1% risk for a subsequent stroke at 7 days) can be managed safely as outpatients without causing delays in their departure for vascular imaging or neurology consultation during their initial emergency department visits, Dr. Perry added. “The Canadian TIA Score can be used to determine the urgency for an assessment by a stroke neurologist.”

The study was published  in CMAJ.
 

Score stratifies risk

Dr. Perry, lead author of the Canadian TIA Score validation study, said that the CMAJ editorial board approached him to write the review and to incorporate the new score into the latest recommendations. To include the latest evidence, Dr. Perry and colleagues reviewed the most recent position statements on TIA and minor stroke management and searched the literature for relevant articles. They note that the nomenclature related to TIA and minor stroke is inconsistent, that it’s not necessary to differentiate between the two from a clinical standpoint, and that the term “acute ischemic cerebrovascular syndrome” has been proposed to include both.

Broadly, the team’s recommended strategy for the diagnosis and management of the condition includes the following steps:

• Diagnosis: Sudden loss of motor function and impaired speech are strong indicators; symptoms tend to be negative (for example, loss of vision rather than flashing lights).
• Risk assessment: Use of the Canadian TIA Score to stratify 7-day stroke risk (low risk: < 1%, medium risk: 1%-5%, high risk: > 5%).
• Investigations: Urgent CT within 48 hours; vascular imaging to identify acutely symptomatic carotid stenosis in medium- to high-risk patients, as determined on the basis of the TIA score; ECG to identify atrial fibrillation or flutter and to optimize anticoagulant use; if the index of suspicion is high, echocardiography should be employed to look for cardioembolic sources.
• Management: Dual antiplatelet therapy for 21 days in medium- and high-risk patients; hypertension should be managed; patients should be referred for stroke clinic assessment; aggressive lifestyle changes should be initiated to lower lipid levels.

“I believe that our recommendations should be incorporated with the clinical guidelines,” said Dr. Perry.
 

Caveats and concerns

Commenting on the article, Steven M. Greenberg, MD, PhD, vice chair for faculty development of the department of neurology at Massachusetts General Hospital and a professor of neurology at Harvard Medical School, both in Boston, said, “Although the proposed guidelines are broadly evidence-based and consistent with standard of care, there are several areas where stroke specialists might disagree and suggest alternative strategies.” Dr. Greenberg was not involved in the study.

While some lower-risk features, such as repetitive or stereotyped symptoms or vertigo, can be more suggestive of TIA mimics, he said that “these features need to be scrutinized quite carefully. Critical carotid stenosis, for example, can give rise to brief, repetitive, stereotyped low-flow TIAs that require urgent revascularization.”

Vertigo might be a feature of brainstem or cerebellar TIA or minor stroke, said Dr. Greenberg, especially in the setting of other posterior circulation symptoms. Validated guidelines for differentiating peripheral vertigo and CNS vertigo are available, he noted.

“Another caveat is that the studies demonstrating benefit of brief dual antiplatelet therapy following acute TIA or minor stroke were based on ABCD2 rather than the Canadian TIA score,” he said. “It is therefore important for any score-based recommendations to be applied in the overall context of existing stroke prevention guidelines.”

In addition to the recommendation for urgent vascular imaging of patients whose presentations suggest bona fide TIA or minor stroke, most guidelines also recommend extended cardiac monitoring and transthoracic ECG to identify potential sources of embolism, Dr. Greenberg added. “Users of these guidelines should also be aware of the limited yield of head CT, which is able to detect some old strokes, large acute strokes – presumably not relevant to patients presenting with TIA or minor stroke – and acute intracranial hemorrhages.”

Louis R. Caplan, MD, founder of the Harvard Stroke Registry at Beth Israel Deaconess Medical Center, Boston, and a professor of neurology at Harvard Medical School, also commented on the study.

While the review “is okay for care by nonstroke specialists, ideally, major referral centers could have a TIA or stroke clinic, as is present in much of Western Europe,” he said. This would allow the stroke etiology to be investigated for each patient.

“Many patients can be treated with the regimen outlined by the authors, but some with other conditions, such as atrial cardiopathy, patent foramen ovale, atrial myxoma, thrombus within the cardiac ventricle or atrium, will require anticoagulants,” he noted. “Thrombolysis and mechanical thrombectomy would be considered in some. Each stroke patient is different, and management cannot be homogenized into one remedy. One size does not fit all.”

In an accompanying commentary, Shelagh B. Coutts, MD, and Michael D. Hill, MD, both of the University of Calgary (Alta.), presented their team’s approach to the acute management of patients with likely cerebral ischemia. Such management includes risk assessment and stratification by clinical symptoms, rather than a particular score. They also typically conduct CT angiography. “If the CTA is completely normal (that is, no occlusion, no atherosclerosis or arterial dissection and no other vascular abnormality), we rely on the high negative predictive value of this result and discharge the patient home on antiplatelet treatment with outpatient follow-up, including MRI of the brain (since CT cannot reliably rule out minor ischemia) within the first week,” they write.

The review was conducted without commercial funding. Dr. Perry, Dr. Greenberg, Dr. Caplan, Dr. Coutts, and Dr. Hill have disclosed no relevant financial relationships.

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

The authors of a new evidence review recommend the Canadian TIA Risk Score for managing patients who present to the emergency department or physician’s office with an apparent transient ischemic attack (TIA) or minor stroke.

“Many hospitals do not have enough stroke neurologists to see every patient with TIA or minor stroke within 24 hours. Likewise, many emergency departments around the world are stretched beyond capacity,” study author Jeffery J. Perry, MD, senior scientist at the Ottawa Hospital Research Institute, said in an interview.

“This review corresponds to most of the recommendations by the American Heart Association and the Canadian Stroke Best Practice Recommendations,” he said. “It does, however, go further to differentiate high-risk versus low-risk patients for subsequent stroke using the Canadian TIA Score and offers practical suggestions for how to provide high-quality care in environments without the capacity to provide immediate vascular imaging, immediate MRI scanning, and immediate stroke specialist assessments.”

Most patients at low risk of a subsequent stroke (that is, patients with < 1% risk for a subsequent stroke at 7 days) can be managed safely as outpatients without causing delays in their departure for vascular imaging or neurology consultation during their initial emergency department visits, Dr. Perry added. “The Canadian TIA Score can be used to determine the urgency for an assessment by a stroke neurologist.”

The study was published  in CMAJ.
 

Score stratifies risk

Dr. Perry, lead author of the Canadian TIA Score validation study, said that the CMAJ editorial board approached him to write the review and to incorporate the new score into the latest recommendations. To include the latest evidence, Dr. Perry and colleagues reviewed the most recent position statements on TIA and minor stroke management and searched the literature for relevant articles. They note that the nomenclature related to TIA and minor stroke is inconsistent, that it’s not necessary to differentiate between the two from a clinical standpoint, and that the term “acute ischemic cerebrovascular syndrome” has been proposed to include both.

Broadly, the team’s recommended strategy for the diagnosis and management of the condition includes the following steps:

• Diagnosis: Sudden loss of motor function and impaired speech are strong indicators; symptoms tend to be negative (for example, loss of vision rather than flashing lights).
• Risk assessment: Use of the Canadian TIA Score to stratify 7-day stroke risk (low risk: < 1%, medium risk: 1%-5%, high risk: > 5%).
• Investigations: Urgent CT within 48 hours; vascular imaging to identify acutely symptomatic carotid stenosis in medium- to high-risk patients, as determined on the basis of the TIA score; ECG to identify atrial fibrillation or flutter and to optimize anticoagulant use; if the index of suspicion is high, echocardiography should be employed to look for cardioembolic sources.
• Management: Dual antiplatelet therapy for 21 days in medium- and high-risk patients; hypertension should be managed; patients should be referred for stroke clinic assessment; aggressive lifestyle changes should be initiated to lower lipid levels.

“I believe that our recommendations should be incorporated with the clinical guidelines,” said Dr. Perry.
 

Caveats and concerns

Commenting on the article, Steven M. Greenberg, MD, PhD, vice chair for faculty development of the department of neurology at Massachusetts General Hospital and a professor of neurology at Harvard Medical School, both in Boston, said, “Although the proposed guidelines are broadly evidence-based and consistent with standard of care, there are several areas where stroke specialists might disagree and suggest alternative strategies.” Dr. Greenberg was not involved in the study.

While some lower-risk features, such as repetitive or stereotyped symptoms or vertigo, can be more suggestive of TIA mimics, he said that “these features need to be scrutinized quite carefully. Critical carotid stenosis, for example, can give rise to brief, repetitive, stereotyped low-flow TIAs that require urgent revascularization.”

Vertigo might be a feature of brainstem or cerebellar TIA or minor stroke, said Dr. Greenberg, especially in the setting of other posterior circulation symptoms. Validated guidelines for differentiating peripheral vertigo and CNS vertigo are available, he noted.

“Another caveat is that the studies demonstrating benefit of brief dual antiplatelet therapy following acute TIA or minor stroke were based on ABCD2 rather than the Canadian TIA score,” he said. “It is therefore important for any score-based recommendations to be applied in the overall context of existing stroke prevention guidelines.”

In addition to the recommendation for urgent vascular imaging of patients whose presentations suggest bona fide TIA or minor stroke, most guidelines also recommend extended cardiac monitoring and transthoracic ECG to identify potential sources of embolism, Dr. Greenberg added. “Users of these guidelines should also be aware of the limited yield of head CT, which is able to detect some old strokes, large acute strokes – presumably not relevant to patients presenting with TIA or minor stroke – and acute intracranial hemorrhages.”

Louis R. Caplan, MD, founder of the Harvard Stroke Registry at Beth Israel Deaconess Medical Center, Boston, and a professor of neurology at Harvard Medical School, also commented on the study.

While the review “is okay for care by nonstroke specialists, ideally, major referral centers could have a TIA or stroke clinic, as is present in much of Western Europe,” he said. This would allow the stroke etiology to be investigated for each patient.

“Many patients can be treated with the regimen outlined by the authors, but some with other conditions, such as atrial cardiopathy, patent foramen ovale, atrial myxoma, thrombus within the cardiac ventricle or atrium, will require anticoagulants,” he noted. “Thrombolysis and mechanical thrombectomy would be considered in some. Each stroke patient is different, and management cannot be homogenized into one remedy. One size does not fit all.”

In an accompanying commentary, Shelagh B. Coutts, MD, and Michael D. Hill, MD, both of the University of Calgary (Alta.), presented their team’s approach to the acute management of patients with likely cerebral ischemia. Such management includes risk assessment and stratification by clinical symptoms, rather than a particular score. They also typically conduct CT angiography. “If the CTA is completely normal (that is, no occlusion, no atherosclerosis or arterial dissection and no other vascular abnormality), we rely on the high negative predictive value of this result and discharge the patient home on antiplatelet treatment with outpatient follow-up, including MRI of the brain (since CT cannot reliably rule out minor ischemia) within the first week,” they write.

The review was conducted without commercial funding. Dr. Perry, Dr. Greenberg, Dr. Caplan, Dr. Coutts, and Dr. Hill have disclosed no relevant financial relationships.

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

Both male and female internal medicine (IM) residents prioritized work-life balance, such as stable working hours and family friendliness, when considering career choices, and cardiology was perceived to fall short in this area, an updated survey revealed.

Originally conducted in 2010, the survey aimed to understand IM residents’ professional development preferences and perceptions of cardiology as a specialty. That survey demonstrated a discordance between what residents valued in making a career choice and their perceptions of a career in cardiology.

The discordance remained in 2020, with residents even more likely than their predecessors to report negative perceptions of cardiology.

Compared with residents surveyed in 2010, respondents in 2020 placed higher value on all aspects of work-life balance and of having role models who demonstrated a successful balance. The value change was particularly notable for men.

“While our survey does not elucidate why this is, speculation could be made that this value on work-life balance is generational and prominent in the youngest generations entering all professional fields, not just medicine,” lead author Meghan York, MD, of Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, told this news organization.

“There is also an interesting trend that dual-career couples are on the rise in the U.S.,” she said. “This may reflect that trend, [with] men in medical fields possibly taking on more domestic responsibility and requiring more work flexibility to do that.”

Regarding perceptions, she added, cardiology tends to show resident cardiologists who are working in inpatient services with “ballooning and unpredictable hours,” rather than those who are working in more time-controlled clinics. Therefore, “their prime exposure to physicians is not truly representative of the career.” The study was published online in JAMA Cardiology.
 

‘Lack of diversity’

The updated surveys were sent by various means to close to 30,000 residents, and were completed by 840 (mean age, 29; 50% male; 55% White). Cardiology was a favored subspecialty choice among men, with 46.5% reporting they were considering it vs. 29.7% of women. Women were more likely to report never having considered cardiology as a career choice (37.6%) compared with men (22.3%).

The survey incorporated a 5-point Likert scale of 1 (not important) to 5 (extremely important) for some of the questions.

The most important professional development preferences for respondents were positive role models (4.56), stimulating career (3.81), family friendly (3.78), patient focus (3.70), stable work hours (3.66), female or race friendly (3.33), professional challenges (3.21), and financial benefits (3.20).

The cardiology perception statements with the highest agreement were:

• Interferes with family life during training (3.93).
• Having met positive role models or having positive views of cardiovascular disease as a topic (3.85).
• Reasonable compensation (3.69).
• Adverse job conditions (3.16).
• Field lacks diversity (2.90).

Compared with the 2010 survey, the 2020 findings indicated increased importance on work-life balance components for both male and female residents, with a greater change among males.

In addition, 2020 respondents were more likely than their predecessors to report negative perceptions of cardiology, such as too much overnight or weekend call, challenging to have children during fellowship, and lack of diversity.

“The culture of the subspecialty of cardiology has not improved to become significantly more diverse or inclusive, whereas other specialties and subspecialties have, and residents interact with cardiologists frequently and can see that,” Dr. York noted.

“As women now make up greater than 50% of medical students,” she said, “it is reasonable to focus on women in medical school and residency to bring them into the field of cardiology. But as racial and ethnic minority groups are also massively underrepresented in medical school, recruitment into medicine needs to start much earlier, in high school and college.

“Creating and supporting rotations that embed residents in the outpatient cardiology setting and exposure to more longitudinal experiences will provide a more realistic picture of the career,” she concluded. 
 

ACC ‘at the forefront’

“Work-life balance looks different for each and every individual, but there are some themes that we need to think about,” Lisa Rose-Jones, MD, chair of the American College of Cardiology’s Program Directors and Graduate Medical Educators Section, said in her comments on the study. “The ACC is really at the forefront of this. They are putting together different work groups to focus on ‘how can we have some innovations?’ ”

The ACC is seeking mentors as part of its workforce diversity efforts among African American/Black, Hispanic/LatinX and Women’s IM cardiology programs, she noted. Furthermore, on Oct. 13, the organization released its 2022 health policy statement on career flexibility in cardiology, which calls for more leeway for cardiologists to deal with common life events without jeopardizing their careers.  

Dr. Rose-Jones, director of the training program in cardiovascular disease at the University of North Carolina at Chapel Hill, said that because both male and female residents placed a high value on work-life balance, “we’ve got to think about how we can have flexibility in our work hours. That is critically important. Health systems need to be able to accommodate working families that may need to alter traditional 9 to 5 work hours to meet the demands of being a successful cardiologist and also being a parent.”

In addition, she said, “We need to have very clear policies at every institution on gender-related and parent-related discrimination. Data show that many female trainees are still being questioned on their family planning. That is absolutely not appropriate. It is none of our business. While we continue to do that, we continue to create stigma in our field.”

Like Dr. York, she noted generational differences in the doctors who are coming up now. “They’ve seen burnout firsthand and want to have a well-balanced life that includes medicine, but also life outside of the hospital,” Dr. Rose-Jones said. “So, those of us in cardiology really need to look deep inside and make changes. We need to be thoughtful about how we can be innovative.”

No commercial funding or conflicts of interest were declared.

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

Both male and female internal medicine (IM) residents prioritized work-life balance, such as stable working hours and family friendliness, when considering career choices, and cardiology was perceived to fall short in this area, an updated survey revealed.

Originally conducted in 2010, the survey aimed to understand IM residents’ professional development preferences and perceptions of cardiology as a specialty. That survey demonstrated a discordance between what residents valued in making a career choice and their perceptions of a career in cardiology.

The discordance remained in 2020, with residents even more likely than their predecessors to report negative perceptions of cardiology.

Compared with residents surveyed in 2010, respondents in 2020 placed higher value on all aspects of work-life balance and of having role models who demonstrated a successful balance. The value change was particularly notable for men.

“While our survey does not elucidate why this is, speculation could be made that this value on work-life balance is generational and prominent in the youngest generations entering all professional fields, not just medicine,” lead author Meghan York, MD, of Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, told this news organization.

“There is also an interesting trend that dual-career couples are on the rise in the U.S.,” she said. “This may reflect that trend, [with] men in medical fields possibly taking on more domestic responsibility and requiring more work flexibility to do that.”

Regarding perceptions, she added, cardiology tends to show resident cardiologists who are working in inpatient services with “ballooning and unpredictable hours,” rather than those who are working in more time-controlled clinics. Therefore, “their prime exposure to physicians is not truly representative of the career.” The study was published online in JAMA Cardiology.
 

‘Lack of diversity’

The updated surveys were sent by various means to close to 30,000 residents, and were completed by 840 (mean age, 29; 50% male; 55% White). Cardiology was a favored subspecialty choice among men, with 46.5% reporting they were considering it vs. 29.7% of women. Women were more likely to report never having considered cardiology as a career choice (37.6%) compared with men (22.3%).

The survey incorporated a 5-point Likert scale of 1 (not important) to 5 (extremely important) for some of the questions.

The most important professional development preferences for respondents were positive role models (4.56), stimulating career (3.81), family friendly (3.78), patient focus (3.70), stable work hours (3.66), female or race friendly (3.33), professional challenges (3.21), and financial benefits (3.20).

The cardiology perception statements with the highest agreement were:

• Interferes with family life during training (3.93).
• Having met positive role models or having positive views of cardiovascular disease as a topic (3.85).
• Reasonable compensation (3.69).
• Adverse job conditions (3.16).
• Field lacks diversity (2.90).

Compared with the 2010 survey, the 2020 findings indicated increased importance on work-life balance components for both male and female residents, with a greater change among males.

In addition, 2020 respondents were more likely than their predecessors to report negative perceptions of cardiology, such as too much overnight or weekend call, challenging to have children during fellowship, and lack of diversity.

“The culture of the subspecialty of cardiology has not improved to become significantly more diverse or inclusive, whereas other specialties and subspecialties have, and residents interact with cardiologists frequently and can see that,” Dr. York noted.

“As women now make up greater than 50% of medical students,” she said, “it is reasonable to focus on women in medical school and residency to bring them into the field of cardiology. But as racial and ethnic minority groups are also massively underrepresented in medical school, recruitment into medicine needs to start much earlier, in high school and college.

“Creating and supporting rotations that embed residents in the outpatient cardiology setting and exposure to more longitudinal experiences will provide a more realistic picture of the career,” she concluded. 
 

ACC ‘at the forefront’

“Work-life balance looks different for each and every individual, but there are some themes that we need to think about,” Lisa Rose-Jones, MD, chair of the American College of Cardiology’s Program Directors and Graduate Medical Educators Section, said in her comments on the study. “The ACC is really at the forefront of this. They are putting together different work groups to focus on ‘how can we have some innovations?’ ”

The ACC is seeking mentors as part of its workforce diversity efforts among African American/Black, Hispanic/LatinX and Women’s IM cardiology programs, she noted. Furthermore, on Oct. 13, the organization released its 2022 health policy statement on career flexibility in cardiology, which calls for more leeway for cardiologists to deal with common life events without jeopardizing their careers.  

Dr. Rose-Jones, director of the training program in cardiovascular disease at the University of North Carolina at Chapel Hill, said that because both male and female residents placed a high value on work-life balance, “we’ve got to think about how we can have flexibility in our work hours. That is critically important. Health systems need to be able to accommodate working families that may need to alter traditional 9 to 5 work hours to meet the demands of being a successful cardiologist and also being a parent.”

In addition, she said, “We need to have very clear policies at every institution on gender-related and parent-related discrimination. Data show that many female trainees are still being questioned on their family planning. That is absolutely not appropriate. It is none of our business. While we continue to do that, we continue to create stigma in our field.”

Like Dr. York, she noted generational differences in the doctors who are coming up now. “They’ve seen burnout firsthand and want to have a well-balanced life that includes medicine, but also life outside of the hospital,” Dr. Rose-Jones said. “So, those of us in cardiology really need to look deep inside and make changes. We need to be thoughtful about how we can be innovative.”

No commercial funding or conflicts of interest were declared.

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

Both male and female internal medicine (IM) residents prioritized work-life balance, such as stable working hours and family friendliness, when considering career choices, and cardiology was perceived to fall short in this area, an updated survey revealed.

Originally conducted in 2010, the survey aimed to understand IM residents’ professional development preferences and perceptions of cardiology as a specialty. That survey demonstrated a discordance between what residents valued in making a career choice and their perceptions of a career in cardiology.

The discordance remained in 2020, with residents even more likely than their predecessors to report negative perceptions of cardiology.

Compared with residents surveyed in 2010, respondents in 2020 placed higher value on all aspects of work-life balance and of having role models who demonstrated a successful balance. The value change was particularly notable for men.

“While our survey does not elucidate why this is, speculation could be made that this value on work-life balance is generational and prominent in the youngest generations entering all professional fields, not just medicine,” lead author Meghan York, MD, of Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, told this news organization.

“There is also an interesting trend that dual-career couples are on the rise in the U.S.,” she said. “This may reflect that trend, [with] men in medical fields possibly taking on more domestic responsibility and requiring more work flexibility to do that.”

Regarding perceptions, she added, cardiology tends to show resident cardiologists who are working in inpatient services with “ballooning and unpredictable hours,” rather than those who are working in more time-controlled clinics. Therefore, “their prime exposure to physicians is not truly representative of the career.” The study was published online in JAMA Cardiology.
 

‘Lack of diversity’

The updated surveys were sent by various means to close to 30,000 residents, and were completed by 840 (mean age, 29; 50% male; 55% White). Cardiology was a favored subspecialty choice among men, with 46.5% reporting they were considering it vs. 29.7% of women. Women were more likely to report never having considered cardiology as a career choice (37.6%) compared with men (22.3%).

The survey incorporated a 5-point Likert scale of 1 (not important) to 5 (extremely important) for some of the questions.

The most important professional development preferences for respondents were positive role models (4.56), stimulating career (3.81), family friendly (3.78), patient focus (3.70), stable work hours (3.66), female or race friendly (3.33), professional challenges (3.21), and financial benefits (3.20).

The cardiology perception statements with the highest agreement were:

• Interferes with family life during training (3.93).
• Having met positive role models or having positive views of cardiovascular disease as a topic (3.85).
• Reasonable compensation (3.69).
• Adverse job conditions (3.16).
• Field lacks diversity (2.90).

Compared with the 2010 survey, the 2020 findings indicated increased importance on work-life balance components for both male and female residents, with a greater change among males.

In addition, 2020 respondents were more likely than their predecessors to report negative perceptions of cardiology, such as too much overnight or weekend call, challenging to have children during fellowship, and lack of diversity.

“The culture of the subspecialty of cardiology has not improved to become significantly more diverse or inclusive, whereas other specialties and subspecialties have, and residents interact with cardiologists frequently and can see that,” Dr. York noted.

“As women now make up greater than 50% of medical students,” she said, “it is reasonable to focus on women in medical school and residency to bring them into the field of cardiology. But as racial and ethnic minority groups are also massively underrepresented in medical school, recruitment into medicine needs to start much earlier, in high school and college.

“Creating and supporting rotations that embed residents in the outpatient cardiology setting and exposure to more longitudinal experiences will provide a more realistic picture of the career,” she concluded. 
 

ACC ‘at the forefront’

“Work-life balance looks different for each and every individual, but there are some themes that we need to think about,” Lisa Rose-Jones, MD, chair of the American College of Cardiology’s Program Directors and Graduate Medical Educators Section, said in her comments on the study. “The ACC is really at the forefront of this. They are putting together different work groups to focus on ‘how can we have some innovations?’ ”

The ACC is seeking mentors as part of its workforce diversity efforts among African American/Black, Hispanic/LatinX and Women’s IM cardiology programs, she noted. Furthermore, on Oct. 13, the organization released its 2022 health policy statement on career flexibility in cardiology, which calls for more leeway for cardiologists to deal with common life events without jeopardizing their careers.  

Dr. Rose-Jones, director of the training program in cardiovascular disease at the University of North Carolina at Chapel Hill, said that because both male and female residents placed a high value on work-life balance, “we’ve got to think about how we can have flexibility in our work hours. That is critically important. Health systems need to be able to accommodate working families that may need to alter traditional 9 to 5 work hours to meet the demands of being a successful cardiologist and also being a parent.”

In addition, she said, “We need to have very clear policies at every institution on gender-related and parent-related discrimination. Data show that many female trainees are still being questioned on their family planning. That is absolutely not appropriate. It is none of our business. While we continue to do that, we continue to create stigma in our field.”

Like Dr. York, she noted generational differences in the doctors who are coming up now. “They’ve seen burnout firsthand and want to have a well-balanced life that includes medicine, but also life outside of the hospital,” Dr. Rose-Jones said. “So, those of us in cardiology really need to look deep inside and make changes. We need to be thoughtful about how we can be innovative.”

No commercial funding or conflicts of interest were declared.

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

The ability of an Apple Watch to detect atrial fibrillation (AFib) is significantly affected by underlying ECG abnormalities such as sinus node dysfunction, atrioventricular (AV) block, or intraventricular conduction delay (IVCD), a single-center study suggests.

LDProd/Getty Images

“We were surprised to find that in one in every five patients, the smartwatch ECG failed to produce an automatic diagnosis,” study author Marc Strik, MD, PhD, a clinician at Bordeaux University Hospital in Pessac, France, told this news organization. “This [failure] was mostly due to insufficient quality of the tracing [60%], but in a third of cases, [34%], it was due to bradycardia, and in some cases, tachycardia [6%].

“We were also surprised to find that the existence of ventricular conduction disease was associated with a higher likelihood of missing AFib,” he said.

The study was published in the Canadian Journal of Cardiology.
 

Abnormalities affected detection

The investigators tested the accuracy of the Apple Watch (Apple, Cupertino, California) in detecting AFib in patients with various ECG anomalies. All participants underwent 12-lead ECG, followed by a 30-second ECG tracing with an Apple Watch Series 5. The smartwatch’s automated AFib detection algorithm gave a result of “no signs of AFib,” “AFib,” or “not checked for AFib (unclassified).”

Unclassified recordings resulted from “low heart rate” (below 50 beats/min), “high heart rate” (above 150 beats/min), “poor recording,” or “inconclusive recording.”

The smartwatch recordings were reviewed by a blinded electrophysiologist who interpreted each tracing and assigned a diagnosis of “AFib,” “absence of AFib,” or “diagnosis unclear.” To assess interobserver agreement, a second blinded electrophysiologist interpreted 100 randomly selected tracings.

Among the 734 patients (mean age, 66; 58% men) enrolled, 539 (73%) were in normal sinus rhythm (SR), 154 (21%) in AFib, 33 in atrial flutter or atrial tachycardia, 3 in ventricular tachycardia, and 5 in junctional tachycardia.

Furthermore, 65 (8.9%) had sinus node dysfunction, 21 (2.9%) had second- or third-degree AV block, 39 (5.3%) had a ventricular paced rhythm, 54 (7.4%) had premature ventricular contractions (PVCs), and 132 (18%) had IVCD (right or left bundle branch block or nonspecific IVCD).

Of the 539 patients in normal SR, 437 recordings were correctly diagnosed by the smartwatch, 7 were diagnosed incorrectly as AFib, and 95 were not classified.

Of the 187 patients in AFib, 129 were correctly diagnosed, 17 were incorrectly diagnosed as SR, and 41 were not classified.

When unclassified ECGs were considered false results, the smartwatch had a sensitivity of 69% and specificity of 81% for AFib detection. When unclassified ECGs were excluded from the analysis, sensitivity was 88%, and specificity was 98%.

Compared with patients without the abnormality, the relative risk of having false positive tracings was higher for patients with premature atrial contractions (PACs) or PVCs (risk ratio, 2.9), sinus node dysfunction (RR, 3.71), and AV block (RR, 7.8).

Fifty-eight patients with AFib were classified as SR or inconclusive by the smartwatch. Among them, 21 (36%) had an IVCD, 7 (12%) had a ventricular paced rhythm, and 5 (9%) had PACs or PVCs.

The risk of having false negative tracings (missed AF) was higher for patients with IVCD (RR, 2.6) and pacing (RR, 2.47), compared with those without the abnormality.
 

‘A powerful tool’

Overall, cardiac electrophysiologists showed high agreement in differentiating between AFib and non-AFib, with high interobserver reproducibility. A manual diagnosis was not possible for 10% of tracings because of either poor ECG quality (3%) or unclear P-waves (7%).

Fifty-nine of the 580 patients in SR were misclassified as AFib by the experts, and 5 of the 154 patients in AFib were misclassified as SR.

“Our results show that the presence of sinus node dysfunction, second- or third-degree AV block, ventricular paced rhythm, PVCs, and IVCD were more frequently represented in smartwatch misdiagnoses,” wrote the authors. “Patients with PVCs were three times as likely to have false positive AFib diagnoses.”

Study limitations included the single-center nature of the study and the fact that patients were recruited in a cardiology office. The latter factor may have influenced the incidence of ECG abnormalities, which was much higher than for the average smartwatch user.

“Even with its limitations, the smartwatch remains a powerful tool that is able to detect AFib and multiple other abnormalities,” said Dr. Strik. “Missed diagnosis of AFib may be less important in real life because of repeated measurements, and algorithms will continue to improve.”
 

Technology improving

Richard C. Becker, MD, director and physician in chief of the University of Cincinnati Heart, Lung, and Vascular Institute, said, “This is exactly the kind of investigation required to improve upon existing detection algorithms that will someday facilitate routine use in patient care. An ability to detect AFib in a large proportion of those with the heart rhythm abnormality is encouraging.”

The findings should not detract from well-conducted studies in otherwise healthy individuals of varied age in whom AFib was accurately detected, he added. “Similarly, an automatic diagnosis algorithm for AF, pending optimization and validation in a large and diverse cohort, should be viewed as a communication tool between patients and health care providers.”

Patients at risk for developing AFib could benefit from continuous monitoring using a smartwatch, said Dr. Becker. “Pre-existing heart rhythm abnormalities must be taken into consideration. Optimal utilization of emerging technology to include wearables requires an understanding of performance and limitations. It is best undertaken in coordination with a health care provider.”

Andrés F. Miranda-Arboleda, MD, and Adrian Baranchuk, MD, of Kingston Health Sciences Center, Canada, conclude in an accompanying editorial, “In a certain manner, the smartwatch algorithms for the detection of AFib in patients with cardiovascular conditions are not yet smart enough ... but they may soon be.”

The study was supported by the French government. Dr. Strik, Dr. Miranda-Arboleda, Dr. Baranchuk, and Dr. Becker reported no conflicts of interest.

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

The ability of an Apple Watch to detect atrial fibrillation (AFib) is significantly affected by underlying ECG abnormalities such as sinus node dysfunction, atrioventricular (AV) block, or intraventricular conduction delay (IVCD), a single-center study suggests.

LDProd/Getty Images

“We were surprised to find that in one in every five patients, the smartwatch ECG failed to produce an automatic diagnosis,” study author Marc Strik, MD, PhD, a clinician at Bordeaux University Hospital in Pessac, France, told this news organization. “This [failure] was mostly due to insufficient quality of the tracing [60%], but in a third of cases, [34%], it was due to bradycardia, and in some cases, tachycardia [6%].

“We were also surprised to find that the existence of ventricular conduction disease was associated with a higher likelihood of missing AFib,” he said.

The study was published in the Canadian Journal of Cardiology.
 

Abnormalities affected detection

The investigators tested the accuracy of the Apple Watch (Apple, Cupertino, California) in detecting AFib in patients with various ECG anomalies. All participants underwent 12-lead ECG, followed by a 30-second ECG tracing with an Apple Watch Series 5. The smartwatch’s automated AFib detection algorithm gave a result of “no signs of AFib,” “AFib,” or “not checked for AFib (unclassified).”

Unclassified recordings resulted from “low heart rate” (below 50 beats/min), “high heart rate” (above 150 beats/min), “poor recording,” or “inconclusive recording.”

The smartwatch recordings were reviewed by a blinded electrophysiologist who interpreted each tracing and assigned a diagnosis of “AFib,” “absence of AFib,” or “diagnosis unclear.” To assess interobserver agreement, a second blinded electrophysiologist interpreted 100 randomly selected tracings.

Among the 734 patients (mean age, 66; 58% men) enrolled, 539 (73%) were in normal sinus rhythm (SR), 154 (21%) in AFib, 33 in atrial flutter or atrial tachycardia, 3 in ventricular tachycardia, and 5 in junctional tachycardia.

Furthermore, 65 (8.9%) had sinus node dysfunction, 21 (2.9%) had second- or third-degree AV block, 39 (5.3%) had a ventricular paced rhythm, 54 (7.4%) had premature ventricular contractions (PVCs), and 132 (18%) had IVCD (right or left bundle branch block or nonspecific IVCD).

Of the 539 patients in normal SR, 437 recordings were correctly diagnosed by the smartwatch, 7 were diagnosed incorrectly as AFib, and 95 were not classified.

Of the 187 patients in AFib, 129 were correctly diagnosed, 17 were incorrectly diagnosed as SR, and 41 were not classified.

When unclassified ECGs were considered false results, the smartwatch had a sensitivity of 69% and specificity of 81% for AFib detection. When unclassified ECGs were excluded from the analysis, sensitivity was 88%, and specificity was 98%.

Compared with patients without the abnormality, the relative risk of having false positive tracings was higher for patients with premature atrial contractions (PACs) or PVCs (risk ratio, 2.9), sinus node dysfunction (RR, 3.71), and AV block (RR, 7.8).

Fifty-eight patients with AFib were classified as SR or inconclusive by the smartwatch. Among them, 21 (36%) had an IVCD, 7 (12%) had a ventricular paced rhythm, and 5 (9%) had PACs or PVCs.

The risk of having false negative tracings (missed AF) was higher for patients with IVCD (RR, 2.6) and pacing (RR, 2.47), compared with those without the abnormality.
 

‘A powerful tool’

Overall, cardiac electrophysiologists showed high agreement in differentiating between AFib and non-AFib, with high interobserver reproducibility. A manual diagnosis was not possible for 10% of tracings because of either poor ECG quality (3%) or unclear P-waves (7%).

Fifty-nine of the 580 patients in SR were misclassified as AFib by the experts, and 5 of the 154 patients in AFib were misclassified as SR.

“Our results show that the presence of sinus node dysfunction, second- or third-degree AV block, ventricular paced rhythm, PVCs, and IVCD were more frequently represented in smartwatch misdiagnoses,” wrote the authors. “Patients with PVCs were three times as likely to have false positive AFib diagnoses.”

Study limitations included the single-center nature of the study and the fact that patients were recruited in a cardiology office. The latter factor may have influenced the incidence of ECG abnormalities, which was much higher than for the average smartwatch user.

“Even with its limitations, the smartwatch remains a powerful tool that is able to detect AFib and multiple other abnormalities,” said Dr. Strik. “Missed diagnosis of AFib may be less important in real life because of repeated measurements, and algorithms will continue to improve.”
 

Technology improving

Richard C. Becker, MD, director and physician in chief of the University of Cincinnati Heart, Lung, and Vascular Institute, said, “This is exactly the kind of investigation required to improve upon existing detection algorithms that will someday facilitate routine use in patient care. An ability to detect AFib in a large proportion of those with the heart rhythm abnormality is encouraging.”

The findings should not detract from well-conducted studies in otherwise healthy individuals of varied age in whom AFib was accurately detected, he added. “Similarly, an automatic diagnosis algorithm for AF, pending optimization and validation in a large and diverse cohort, should be viewed as a communication tool between patients and health care providers.”

Patients at risk for developing AFib could benefit from continuous monitoring using a smartwatch, said Dr. Becker. “Pre-existing heart rhythm abnormalities must be taken into consideration. Optimal utilization of emerging technology to include wearables requires an understanding of performance and limitations. It is best undertaken in coordination with a health care provider.”

Andrés F. Miranda-Arboleda, MD, and Adrian Baranchuk, MD, of Kingston Health Sciences Center, Canada, conclude in an accompanying editorial, “In a certain manner, the smartwatch algorithms for the detection of AFib in patients with cardiovascular conditions are not yet smart enough ... but they may soon be.”

The study was supported by the French government. Dr. Strik, Dr. Miranda-Arboleda, Dr. Baranchuk, and Dr. Becker reported no conflicts of interest.

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

The ability of an Apple Watch to detect atrial fibrillation (AFib) is significantly affected by underlying ECG abnormalities such as sinus node dysfunction, atrioventricular (AV) block, or intraventricular conduction delay (IVCD), a single-center study suggests.

LDProd/Getty Images

“We were surprised to find that in one in every five patients, the smartwatch ECG failed to produce an automatic diagnosis,” study author Marc Strik, MD, PhD, a clinician at Bordeaux University Hospital in Pessac, France, told this news organization. “This [failure] was mostly due to insufficient quality of the tracing [60%], but in a third of cases, [34%], it was due to bradycardia, and in some cases, tachycardia [6%].

“We were also surprised to find that the existence of ventricular conduction disease was associated with a higher likelihood of missing AFib,” he said.

The study was published in the Canadian Journal of Cardiology.
 

Abnormalities affected detection

The investigators tested the accuracy of the Apple Watch (Apple, Cupertino, California) in detecting AFib in patients with various ECG anomalies. All participants underwent 12-lead ECG, followed by a 30-second ECG tracing with an Apple Watch Series 5. The smartwatch’s automated AFib detection algorithm gave a result of “no signs of AFib,” “AFib,” or “not checked for AFib (unclassified).”

Unclassified recordings resulted from “low heart rate” (below 50 beats/min), “high heart rate” (above 150 beats/min), “poor recording,” or “inconclusive recording.”

The smartwatch recordings were reviewed by a blinded electrophysiologist who interpreted each tracing and assigned a diagnosis of “AFib,” “absence of AFib,” or “diagnosis unclear.” To assess interobserver agreement, a second blinded electrophysiologist interpreted 100 randomly selected tracings.

Among the 734 patients (mean age, 66; 58% men) enrolled, 539 (73%) were in normal sinus rhythm (SR), 154 (21%) in AFib, 33 in atrial flutter or atrial tachycardia, 3 in ventricular tachycardia, and 5 in junctional tachycardia.

Furthermore, 65 (8.9%) had sinus node dysfunction, 21 (2.9%) had second- or third-degree AV block, 39 (5.3%) had a ventricular paced rhythm, 54 (7.4%) had premature ventricular contractions (PVCs), and 132 (18%) had IVCD (right or left bundle branch block or nonspecific IVCD).

Of the 539 patients in normal SR, 437 recordings were correctly diagnosed by the smartwatch, 7 were diagnosed incorrectly as AFib, and 95 were not classified.

Of the 187 patients in AFib, 129 were correctly diagnosed, 17 were incorrectly diagnosed as SR, and 41 were not classified.

When unclassified ECGs were considered false results, the smartwatch had a sensitivity of 69% and specificity of 81% for AFib detection. When unclassified ECGs were excluded from the analysis, sensitivity was 88%, and specificity was 98%.

Compared with patients without the abnormality, the relative risk of having false positive tracings was higher for patients with premature atrial contractions (PACs) or PVCs (risk ratio, 2.9), sinus node dysfunction (RR, 3.71), and AV block (RR, 7.8).

Fifty-eight patients with AFib were classified as SR or inconclusive by the smartwatch. Among them, 21 (36%) had an IVCD, 7 (12%) had a ventricular paced rhythm, and 5 (9%) had PACs or PVCs.

The risk of having false negative tracings (missed AF) was higher for patients with IVCD (RR, 2.6) and pacing (RR, 2.47), compared with those without the abnormality.
 

‘A powerful tool’

Overall, cardiac electrophysiologists showed high agreement in differentiating between AFib and non-AFib, with high interobserver reproducibility. A manual diagnosis was not possible for 10% of tracings because of either poor ECG quality (3%) or unclear P-waves (7%).

Fifty-nine of the 580 patients in SR were misclassified as AFib by the experts, and 5 of the 154 patients in AFib were misclassified as SR.

“Our results show that the presence of sinus node dysfunction, second- or third-degree AV block, ventricular paced rhythm, PVCs, and IVCD were more frequently represented in smartwatch misdiagnoses,” wrote the authors. “Patients with PVCs were three times as likely to have false positive AFib diagnoses.”

Study limitations included the single-center nature of the study and the fact that patients were recruited in a cardiology office. The latter factor may have influenced the incidence of ECG abnormalities, which was much higher than for the average smartwatch user.

“Even with its limitations, the smartwatch remains a powerful tool that is able to detect AFib and multiple other abnormalities,” said Dr. Strik. “Missed diagnosis of AFib may be less important in real life because of repeated measurements, and algorithms will continue to improve.”
 

Technology improving

Richard C. Becker, MD, director and physician in chief of the University of Cincinnati Heart, Lung, and Vascular Institute, said, “This is exactly the kind of investigation required to improve upon existing detection algorithms that will someday facilitate routine use in patient care. An ability to detect AFib in a large proportion of those with the heart rhythm abnormality is encouraging.”

The findings should not detract from well-conducted studies in otherwise healthy individuals of varied age in whom AFib was accurately detected, he added. “Similarly, an automatic diagnosis algorithm for AF, pending optimization and validation in a large and diverse cohort, should be viewed as a communication tool between patients and health care providers.”

Patients at risk for developing AFib could benefit from continuous monitoring using a smartwatch, said Dr. Becker. “Pre-existing heart rhythm abnormalities must be taken into consideration. Optimal utilization of emerging technology to include wearables requires an understanding of performance and limitations. It is best undertaken in coordination with a health care provider.”

Andrés F. Miranda-Arboleda, MD, and Adrian Baranchuk, MD, of Kingston Health Sciences Center, Canada, conclude in an accompanying editorial, “In a certain manner, the smartwatch algorithms for the detection of AFib in patients with cardiovascular conditions are not yet smart enough ... but they may soon be.”

The study was supported by the French government. Dr. Strik, Dr. Miranda-Arboleda, Dr. Baranchuk, and Dr. Becker reported no conflicts of interest.

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

Athletes with mild hypertrophic cardiomyopathy (HCM) at low risk of sudden cardiac death (SCD) can safely continue to exercise at competitive levels, a retrospective study suggests.

During a mean follow-up of 4.5 years, athletes who continued to engage in high-intensity competitive sports after a mild HCM diagnosis were free of cardiac symptoms, and there were no deaths, incidents of sustained ventricular tachycardia or syncope, or changes in cardiac electrical, structural, or functional phenotypes.

Pavel1964/iStock/Getty Images

“This study supports emerging evidence that HCM individuals with a low-risk profile and mild hypertrophy may engage in vigorous exercise and competitive sport,” Sanjay Sharma, MD, of St. George’s University of London, said in an interview. Current guidelines from the European Society of Cardiology and the American College of Cardiology support a more liberal approach to exercise for these individuals.

That said, he added, “it is important to emphasize that our cohort consisted of a group of adult competitive athletes who had probably been competing for several years before the diagnosis was made and therefore represented a self-selected, low-risk cohort. It is difficult to extrapolate this data to adolescent athletes, who appear to be more vulnerable to exercise-related SCD from HCM.”

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

Vigorous exercise OK for some

Dr. Sharma and colleagues analyzed data from 53 athletes with HCM who continued to participate in competitive sports. The mean age was 39 years, 98% were men, and 72% were White. About half (53%) competed as professionals, and were most commonly engaged in cycling, football, running, and rugby.

Participants underwent 6-12 monthly assessments that included electrocardiograms, echocardiograms, cardiopulmonary exercise testing, Holter monitoring (≥ 24 hours), and cardiac magnetic resonance imaging. A majority (64.2%) were evaluated because of an abnormal electrocardiograms, and one presented with an incidental abnormal echocardiogram.

About a quarter (24.5%) were symptomatic and 5 (9.4%) were identified on family screening. Eight (15%) had a family history of HCM, and six (11.3%) of SCD.

At the baseline evaluation, all athletes had a “low” ESC 5-year SCD risk score for HCM (1.9% ± 0.9%). None had syncope. Mean peak VO₂ was 40.7 ± 6.8 mL/kg per minute.

The mean left ventricular wall thickness was 14.6 ± 2.3 mm; all had normal LV systolic and diastolic function and no LV outflow tract obstruction at rest or on provocation testing. In addition, none had an LV apical aneurysm.

Twenty-two (41%) showed late gadolinium enhancement on baseline cardiac magnetic resonance imaging.

A total of 19 participants underwent genotyping; 4 (21.1%) had a pathogenic/likely pathogenic sarcomeric variant. None took cardiovascular medication or had an implantable cardioverter defibrillator (ICD).

During a mean follow-up of 4.5 years, all participants continued to exercise at the same level as before their diagnosis; none underwent detraining. All stayed free of cardiac symptoms, and there were no deaths, sustained ventricular tachycardia episodes, or syncope.

Four demonstrated new, nonsustained ventricular tachycardia (NSVT) during follow-up, one of whom underwent ICD implantation because of an increased risk score and subsequently moderated exercise levels.

One participant had a 30-second atrial fibrillation (AFib) episode lasting longer than 30 seconds, started on a beta-blocker and oral anticoagulation, and also moderated exercise levels.

The event rate was 2.1% per year for asymptomatic arrhythmias (NSVT and AFib). No changes were observed in the cardiac electrical, structural, or functional phenotype during follow-up.

Dr. Sharma and colleagues stated: “Our sample size is small; however, it is nearly double the size of a previously studied Italian athletic cohort, and one-half were professional athletes. Furthermore, 17% of our cohort comprised Black athletes who are perceived to be at higher risk of SCD than White athletes.”

Daniele Massera, MD, assistant professor in the HCM program, department of medicine, Charney Division of Cardiology, New York University Langone Health, said in an interview: “Of note, these were athletes/patients at the very low end of phenotypic severity of HCM. ... It is also notable that diastolic function was normal in all of them, an uncommon finding in patients with HCM.”

Like Dr. Sharma, he said the findings are in line with recent guidelines, and cautioned: “This small study applies only to a very small subset of patients who are being evaluated at specialized HCM programs: asymptomatic male individuals who have mild, low-risk HCM and are on no medicines.

“The findings cannot be generalized to the population of symptomatic individuals with (or without) outflow obstruction, more severe hypertrophy, and who have ICDs and/or take medication for symptoms, nor to younger patients or adolescents, who may be at higher risk for adverse outcomes,” he concluded.
 

Individualized approach urged

Dr. Sharma was a coauthor of the recent article challenging the traditional restrictive approach to exercise for athletes diagnosed with HCM and other inherited cardiovascular diseases. The article suggested that individualized recommendations, taking risks into consideration, can help guide those who want to exercise or participate in competitive sports.

Dr. Sharma also is a coauthor of a 6-month follow-up to the SAFE-HCM study, which compared the effects of a supervised 12-week high-intensity exercise program to usual care in low-risk individuals with HCM (mean age, 45.7). 

In the 6-month follow-up study, published as an abstract in the European Journal of Preventive Cardiology 2021 supplement, “exercising individuals had improved functional capacity and atherosclerotic risk profile and there were no differences in the composite safety outcomes [cardiovascular death, cardiac arrest, device therapy, exercise-induced syncope, sustained VT, NSVT, or sustained atrial arrhythmias] between exercising individuals and usual care individuals,” Dr. Sharma said.

The full study will soon be ready to submit for publication, he added.

No commercial funding or relevant conflicts of interest were disclosed.

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

Athletes with mild hypertrophic cardiomyopathy (HCM) at low risk of sudden cardiac death (SCD) can safely continue to exercise at competitive levels, a retrospective study suggests.

During a mean follow-up of 4.5 years, athletes who continued to engage in high-intensity competitive sports after a mild HCM diagnosis were free of cardiac symptoms, and there were no deaths, incidents of sustained ventricular tachycardia or syncope, or changes in cardiac electrical, structural, or functional phenotypes.

Pavel1964/iStock/Getty Images

“This study supports emerging evidence that HCM individuals with a low-risk profile and mild hypertrophy may engage in vigorous exercise and competitive sport,” Sanjay Sharma, MD, of St. George’s University of London, said in an interview. Current guidelines from the European Society of Cardiology and the American College of Cardiology support a more liberal approach to exercise for these individuals.

That said, he added, “it is important to emphasize that our cohort consisted of a group of adult competitive athletes who had probably been competing for several years before the diagnosis was made and therefore represented a self-selected, low-risk cohort. It is difficult to extrapolate this data to adolescent athletes, who appear to be more vulnerable to exercise-related SCD from HCM.”

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

Vigorous exercise OK for some

Dr. Sharma and colleagues analyzed data from 53 athletes with HCM who continued to participate in competitive sports. The mean age was 39 years, 98% were men, and 72% were White. About half (53%) competed as professionals, and were most commonly engaged in cycling, football, running, and rugby.

Participants underwent 6-12 monthly assessments that included electrocardiograms, echocardiograms, cardiopulmonary exercise testing, Holter monitoring (≥ 24 hours), and cardiac magnetic resonance imaging. A majority (64.2%) were evaluated because of an abnormal electrocardiograms, and one presented with an incidental abnormal echocardiogram.

About a quarter (24.5%) were symptomatic and 5 (9.4%) were identified on family screening. Eight (15%) had a family history of HCM, and six (11.3%) of SCD.

At the baseline evaluation, all athletes had a “low” ESC 5-year SCD risk score for HCM (1.9% ± 0.9%). None had syncope. Mean peak VO₂ was 40.7 ± 6.8 mL/kg per minute.

The mean left ventricular wall thickness was 14.6 ± 2.3 mm; all had normal LV systolic and diastolic function and no LV outflow tract obstruction at rest or on provocation testing. In addition, none had an LV apical aneurysm.

Twenty-two (41%) showed late gadolinium enhancement on baseline cardiac magnetic resonance imaging.

A total of 19 participants underwent genotyping; 4 (21.1%) had a pathogenic/likely pathogenic sarcomeric variant. None took cardiovascular medication or had an implantable cardioverter defibrillator (ICD).

During a mean follow-up of 4.5 years, all participants continued to exercise at the same level as before their diagnosis; none underwent detraining. All stayed free of cardiac symptoms, and there were no deaths, sustained ventricular tachycardia episodes, or syncope.

Four demonstrated new, nonsustained ventricular tachycardia (NSVT) during follow-up, one of whom underwent ICD implantation because of an increased risk score and subsequently moderated exercise levels.

One participant had a 30-second atrial fibrillation (AFib) episode lasting longer than 30 seconds, started on a beta-blocker and oral anticoagulation, and also moderated exercise levels.

The event rate was 2.1% per year for asymptomatic arrhythmias (NSVT and AFib). No changes were observed in the cardiac electrical, structural, or functional phenotype during follow-up.

Dr. Sharma and colleagues stated: “Our sample size is small; however, it is nearly double the size of a previously studied Italian athletic cohort, and one-half were professional athletes. Furthermore, 17% of our cohort comprised Black athletes who are perceived to be at higher risk of SCD than White athletes.”

Daniele Massera, MD, assistant professor in the HCM program, department of medicine, Charney Division of Cardiology, New York University Langone Health, said in an interview: “Of note, these were athletes/patients at the very low end of phenotypic severity of HCM. ... It is also notable that diastolic function was normal in all of them, an uncommon finding in patients with HCM.”

Like Dr. Sharma, he said the findings are in line with recent guidelines, and cautioned: “This small study applies only to a very small subset of patients who are being evaluated at specialized HCM programs: asymptomatic male individuals who have mild, low-risk HCM and are on no medicines.

“The findings cannot be generalized to the population of symptomatic individuals with (or without) outflow obstruction, more severe hypertrophy, and who have ICDs and/or take medication for symptoms, nor to younger patients or adolescents, who may be at higher risk for adverse outcomes,” he concluded.
 

Individualized approach urged

Dr. Sharma was a coauthor of the recent article challenging the traditional restrictive approach to exercise for athletes diagnosed with HCM and other inherited cardiovascular diseases. The article suggested that individualized recommendations, taking risks into consideration, can help guide those who want to exercise or participate in competitive sports.

Dr. Sharma also is a coauthor of a 6-month follow-up to the SAFE-HCM study, which compared the effects of a supervised 12-week high-intensity exercise program to usual care in low-risk individuals with HCM (mean age, 45.7). 

In the 6-month follow-up study, published as an abstract in the European Journal of Preventive Cardiology 2021 supplement, “exercising individuals had improved functional capacity and atherosclerotic risk profile and there were no differences in the composite safety outcomes [cardiovascular death, cardiac arrest, device therapy, exercise-induced syncope, sustained VT, NSVT, or sustained atrial arrhythmias] between exercising individuals and usual care individuals,” Dr. Sharma said.

The full study will soon be ready to submit for publication, he added.

No commercial funding or relevant conflicts of interest were disclosed.

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

Athletes with mild hypertrophic cardiomyopathy (HCM) at low risk of sudden cardiac death (SCD) can safely continue to exercise at competitive levels, a retrospective study suggests.

During a mean follow-up of 4.5 years, athletes who continued to engage in high-intensity competitive sports after a mild HCM diagnosis were free of cardiac symptoms, and there were no deaths, incidents of sustained ventricular tachycardia or syncope, or changes in cardiac electrical, structural, or functional phenotypes.

Pavel1964/iStock/Getty Images

“This study supports emerging evidence that HCM individuals with a low-risk profile and mild hypertrophy may engage in vigorous exercise and competitive sport,” Sanjay Sharma, MD, of St. George’s University of London, said in an interview. Current guidelines from the European Society of Cardiology and the American College of Cardiology support a more liberal approach to exercise for these individuals.

That said, he added, “it is important to emphasize that our cohort consisted of a group of adult competitive athletes who had probably been competing for several years before the diagnosis was made and therefore represented a self-selected, low-risk cohort. It is difficult to extrapolate this data to adolescent athletes, who appear to be more vulnerable to exercise-related SCD from HCM.”

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

Vigorous exercise OK for some

Dr. Sharma and colleagues analyzed data from 53 athletes with HCM who continued to participate in competitive sports. The mean age was 39 years, 98% were men, and 72% were White. About half (53%) competed as professionals, and were most commonly engaged in cycling, football, running, and rugby.

Participants underwent 6-12 monthly assessments that included electrocardiograms, echocardiograms, cardiopulmonary exercise testing, Holter monitoring (≥ 24 hours), and cardiac magnetic resonance imaging. A majority (64.2%) were evaluated because of an abnormal electrocardiograms, and one presented with an incidental abnormal echocardiogram.

About a quarter (24.5%) were symptomatic and 5 (9.4%) were identified on family screening. Eight (15%) had a family history of HCM, and six (11.3%) of SCD.

At the baseline evaluation, all athletes had a “low” ESC 5-year SCD risk score for HCM (1.9% ± 0.9%). None had syncope. Mean peak VO₂ was 40.7 ± 6.8 mL/kg per minute.

The mean left ventricular wall thickness was 14.6 ± 2.3 mm; all had normal LV systolic and diastolic function and no LV outflow tract obstruction at rest or on provocation testing. In addition, none had an LV apical aneurysm.

Twenty-two (41%) showed late gadolinium enhancement on baseline cardiac magnetic resonance imaging.

A total of 19 participants underwent genotyping; 4 (21.1%) had a pathogenic/likely pathogenic sarcomeric variant. None took cardiovascular medication or had an implantable cardioverter defibrillator (ICD).

During a mean follow-up of 4.5 years, all participants continued to exercise at the same level as before their diagnosis; none underwent detraining. All stayed free of cardiac symptoms, and there were no deaths, sustained ventricular tachycardia episodes, or syncope.

Four demonstrated new, nonsustained ventricular tachycardia (NSVT) during follow-up, one of whom underwent ICD implantation because of an increased risk score and subsequently moderated exercise levels.

One participant had a 30-second atrial fibrillation (AFib) episode lasting longer than 30 seconds, started on a beta-blocker and oral anticoagulation, and also moderated exercise levels.

The event rate was 2.1% per year for asymptomatic arrhythmias (NSVT and AFib). No changes were observed in the cardiac electrical, structural, or functional phenotype during follow-up.

Dr. Sharma and colleagues stated: “Our sample size is small; however, it is nearly double the size of a previously studied Italian athletic cohort, and one-half were professional athletes. Furthermore, 17% of our cohort comprised Black athletes who are perceived to be at higher risk of SCD than White athletes.”

Daniele Massera, MD, assistant professor in the HCM program, department of medicine, Charney Division of Cardiology, New York University Langone Health, said in an interview: “Of note, these were athletes/patients at the very low end of phenotypic severity of HCM. ... It is also notable that diastolic function was normal in all of them, an uncommon finding in patients with HCM.”

Like Dr. Sharma, he said the findings are in line with recent guidelines, and cautioned: “This small study applies only to a very small subset of patients who are being evaluated at specialized HCM programs: asymptomatic male individuals who have mild, low-risk HCM and are on no medicines.

“The findings cannot be generalized to the population of symptomatic individuals with (or without) outflow obstruction, more severe hypertrophy, and who have ICDs and/or take medication for symptoms, nor to younger patients or adolescents, who may be at higher risk for adverse outcomes,” he concluded.
 

Individualized approach urged

Dr. Sharma was a coauthor of the recent article challenging the traditional restrictive approach to exercise for athletes diagnosed with HCM and other inherited cardiovascular diseases. The article suggested that individualized recommendations, taking risks into consideration, can help guide those who want to exercise or participate in competitive sports.

Dr. Sharma also is a coauthor of a 6-month follow-up to the SAFE-HCM study, which compared the effects of a supervised 12-week high-intensity exercise program to usual care in low-risk individuals with HCM (mean age, 45.7). 

In the 6-month follow-up study, published as an abstract in the European Journal of Preventive Cardiology 2021 supplement, “exercising individuals had improved functional capacity and atherosclerotic risk profile and there were no differences in the composite safety outcomes [cardiovascular death, cardiac arrest, device therapy, exercise-induced syncope, sustained VT, NSVT, or sustained atrial arrhythmias] between exercising individuals and usual care individuals,” Dr. Sharma said.

The full study will soon be ready to submit for publication, he added.

No commercial funding or relevant conflicts of interest were disclosed.

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