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Dissolving pacemaker impressive in early research
A fully implantable, bioresorbable pacemaker has been developed that’s capable of sustaining heart rhythms in animal and human donor hearts before disappearing over 5-7 weeks.
Temporary pacing devices are frequently used after cardiac surgery but rely on bulky external generators and transcutaneous pacing leads that run the risk of becoming infected or dislodged and can damage the heart when removed if they’re enveloped in fibrotic tissue.
The experimental device is thin, powered without leads or batteries, and made of water-soluble, biocompatible materials, thereby bypassing many of the disadvantages of conventional temporary pacing devices, according to John A. Rogers, PhD, who led the device’s development and directs the Querrey Simpson Institute for Bioelectronics at Northwestern University in Chicago.
“The total material load on the body is very minimal,” he said in an interview. “The amount of silicon and magnesium in a multivitamin tablet is about 3,000 times more than the amount of those materials in our electronics. So you can think of them as a very tiny vitamin pill, in a sense, but configured with electronic functionality.”
Dr. Rogers and his team have a reputation for innovation in bioelectronic medicine, having recently constructed transient wireless devices to accelerate neuroregeneration associated with damaged peripheral nerves, to monitor critically ill neonates, and to detect early signs and symptoms associated with COVID-19.
Shortly after Dr. Rogers joined Northwestern, Rishi Arora, MD, a cardiac electrophysiologist and professor of medicine at Northwestern, reached out to discuss how they could leverage wireless electronics for patients needing temporary pacing.
“It was a natural marriage,” Dr. Arora said in an interview. “Part of the reason to go into the heart was because the cardiology group here at Northwestern, especially on the electrophysiology side, has been very involved in translational research, and John also had a very strong collaboration before he came here with Igor Efimov, [PhD, of George Washington University, Washington], a giant in the field in terms of heart rhythm research.”
Dr. Arora noted that the incidence of temporary pacing after cardiac surgery is at least 10% but can reach 20%. Current devices work well in most patients, but temporary pacing with epicardial wires can cause complications and, typically, work well only for a few days after cardiac surgery. Clinically, though, several patients need postoperative pacing support for 1-2 weeks.
“So if something like this were available where you could tack it onto the surface and forget it for a week or 10 days or 2 weeks, you’d be doing those 20% of patients a huge service,” he said.
Bioresorbable scaffold déjà vu?
The philosophy of “leave nothing behind” is nothing new in cardiology, with bioresorbable vascular scaffolds (BVS) gaining initial support as a potential solution to neoatherosclerosis and late-stent thrombosis in permanent metal stents. Failure to show advantages, and safety concerns such as in-scaffold thrombosis, however, led Abbott to stop global sales of the first approved BVS and Boston Scientific to halt its BVS program in 2017.
The wireless pacemaker, however, is an electrical device, not a mechanical one, observed Dr. Rogers. “The fact that it’s not in the bloodstream greatly lowers risks and, as I mentioned before, everything is super thin, low-mass quantities of materials. So, I guess there’s a relationship there, but it’s different in a couple of very important ways.”
As Dr. Rogers, Dr. Arora, Dr. Efimov, and colleagues recently reported in Nature Biotechnology, the electronic part of the pacemaker contains three layers: A loop antenna with a bilayer tungsten-coated magnesium inductive coil, a radiofrequency PIN diode based on a monocrystalline silicon nanomembrane, and a poly (lactide-co-glycolide) (PLGA) dielectric interlayer.
The electronic components rest between two encapsulation layers of PLGA to isolate the active materials from the surrounding biofluids during implantation, and connect to a pair of flexible extension electrodes that deliver the electrical stimuli to a contact pad sutured onto the heart. The entire system is about 16 mm in width and 15 mm in length, and weighs in at about 0.3 g.
The pacemaker receives power and control commands through a wireless inductive power transfer – the same technology used in implanted medical devices, smartphones, and radio-frequency identification tags – between the receiver coil in the device and a wand-shaped, external transmission coil placed on top of or within a few inches of the heart.
“Right now we’re almost at 15 inches, which I think is a very respectable distance for this particular piece of hardware, and clinically very doable,” observed Dr. Arora.
Competing considerations
Testing thus far shows effective ventricular capture across a range of frequencies in mouse and rabbit hearts and successful pacing and activation of human cardiac tissue.
In vivo tests in dogs also suggest that the system can “achieve the power necessary for operation of bioresorbable pacemakers in adult human patients,” the authors say.
Electrodes placed on the dogs’ legs showed a change in ECG signals from a narrow QRS complex (consistent with a normal rate sinus rhythm of 350-400 bpm) to a widened QRS complex with a shortened R-R interval (consistent with a paced rhythm of 400-450 bpm) – indicating successful ventricular capture.
The device successfully paced the dogs through postoperative day 4 but couldn’t provide enough energy to capture the ventricular myocardium on day 5 and failed to pace the heart on day 6, even when transmitting voltages were increased from 1 Vpp to more than 10 Vpp.
Dr. Rogers pointed out that a transient device of theirs that uses very thin films of silica provides stable intracranial pressure monitoring for traumatic brain injury recovery for 3 weeks before dissolving. The problem with the polymers used as encapsulating layers in the pacemaker is that even if they haven’t completely dissolved, there’s a finite rate of water permeation through the film.
“It turns out that’s what’s become the limiting factor, rather than the chemistry of bioresorption,” he said. “So, what we’re seeing with these devices beginning to degrade electrically in terms of performance around 5-6 days is due to that water permeation.”
Although it is not part of the current study, there’s no reason thin silica layers couldn’t be incorporated into the pacemaker to make it less water permeable, Dr. Rogers said. Still, this will have to be weighed against the competing consideration of stable operating life.
The researchers specifically chose materials that would naturally bioresorb via hydrolysis and metabolic action in the body. PLGA degrades into glycolic and lactic acid, the tungsten-coated magnesium inductive coil into Wox and Mg(OH)2, and the silicon nanomembrane radiofrequency PIN diode into Si(OH)4.
CT imaging in rat models shows the device is enveloped in fibrotic tissue and completely decouples from the heart at 4 weeks, while images of explanted devices suggest the pacemaker largely dissolves within 3 weeks and the remaining residues disappear after 12 weeks.
The researchers have started an investigational device exemption process to allow the device to be used in clinical trials, and they plan to dig deeper into the potential for fragments to form at various stages of resorption, which some imaging suggests may occur.
“Because these devices are made out of pure materials and they’re in a heterogeneous environment, both mechanically and biomechanically, the devices don’t resorb in a perfectly uniform way and, as a result, at the tail end of the process you can end up with small fragments that eventually bioresorb, but before they’re gone, they are potentially mobile within the body cavity,” Dr. Rogers said.
“We feel that because the devices aren’t in the bloodstream, the risk associated with those fragments is probably manageable but at the same time, these are the sorts of details that must be thoroughly addressed before trials in humans,” he said, adding that one solution, if needed, would be to encapsulate the entire device in a thin bioresorbable hydrogel as a containment vehicle.
Dr. Arora said they hope the pacemaker “will make patients’ lives a lot easier in the postoperative setting but, even there, I think one must remember current pacing technology in this setting is actually very good. So there’s a word of caution not to get ahead of ourselves.”
Looking forward, the excitement of this approach is not only in the immediate postop setting but in the transvenous setting, he said. “If we can get to the point where we can actually do this transvenously, that opens up a huge window of opportunity because there we’re talking about post-TAVR [transcatheter aortic valve replacement], post–myocardial infarction, etc.”
Currently, temporary transvenous pacing can be quite unreliable because of a high risk of dislodgement and infection – much higher than for surgical pacing wires, he noted.
“In terms of translatability to larger numbers of patients, the value would be huge. But again, a lot needs to be done before we can get there. But if it can get to that point, then I think you have a real therapy that could potentially be transformative,” Dr. Arora said.
Dr. Rogers reported support from the Leducq Foundation projects RHYTHM and ROI-HL121270. Dr. Arora has disclosed no relevant financial relationships. Coauthor disclosures are listed in the original article.
A version of this article first appeared on Medscape.com.
A fully implantable, bioresorbable pacemaker has been developed that’s capable of sustaining heart rhythms in animal and human donor hearts before disappearing over 5-7 weeks.
Temporary pacing devices are frequently used after cardiac surgery but rely on bulky external generators and transcutaneous pacing leads that run the risk of becoming infected or dislodged and can damage the heart when removed if they’re enveloped in fibrotic tissue.
The experimental device is thin, powered without leads or batteries, and made of water-soluble, biocompatible materials, thereby bypassing many of the disadvantages of conventional temporary pacing devices, according to John A. Rogers, PhD, who led the device’s development and directs the Querrey Simpson Institute for Bioelectronics at Northwestern University in Chicago.
“The total material load on the body is very minimal,” he said in an interview. “The amount of silicon and magnesium in a multivitamin tablet is about 3,000 times more than the amount of those materials in our electronics. So you can think of them as a very tiny vitamin pill, in a sense, but configured with electronic functionality.”
Dr. Rogers and his team have a reputation for innovation in bioelectronic medicine, having recently constructed transient wireless devices to accelerate neuroregeneration associated with damaged peripheral nerves, to monitor critically ill neonates, and to detect early signs and symptoms associated with COVID-19.
Shortly after Dr. Rogers joined Northwestern, Rishi Arora, MD, a cardiac electrophysiologist and professor of medicine at Northwestern, reached out to discuss how they could leverage wireless electronics for patients needing temporary pacing.
“It was a natural marriage,” Dr. Arora said in an interview. “Part of the reason to go into the heart was because the cardiology group here at Northwestern, especially on the electrophysiology side, has been very involved in translational research, and John also had a very strong collaboration before he came here with Igor Efimov, [PhD, of George Washington University, Washington], a giant in the field in terms of heart rhythm research.”
Dr. Arora noted that the incidence of temporary pacing after cardiac surgery is at least 10% but can reach 20%. Current devices work well in most patients, but temporary pacing with epicardial wires can cause complications and, typically, work well only for a few days after cardiac surgery. Clinically, though, several patients need postoperative pacing support for 1-2 weeks.
“So if something like this were available where you could tack it onto the surface and forget it for a week or 10 days or 2 weeks, you’d be doing those 20% of patients a huge service,” he said.
Bioresorbable scaffold déjà vu?
The philosophy of “leave nothing behind” is nothing new in cardiology, with bioresorbable vascular scaffolds (BVS) gaining initial support as a potential solution to neoatherosclerosis and late-stent thrombosis in permanent metal stents. Failure to show advantages, and safety concerns such as in-scaffold thrombosis, however, led Abbott to stop global sales of the first approved BVS and Boston Scientific to halt its BVS program in 2017.
The wireless pacemaker, however, is an electrical device, not a mechanical one, observed Dr. Rogers. “The fact that it’s not in the bloodstream greatly lowers risks and, as I mentioned before, everything is super thin, low-mass quantities of materials. So, I guess there’s a relationship there, but it’s different in a couple of very important ways.”
As Dr. Rogers, Dr. Arora, Dr. Efimov, and colleagues recently reported in Nature Biotechnology, the electronic part of the pacemaker contains three layers: A loop antenna with a bilayer tungsten-coated magnesium inductive coil, a radiofrequency PIN diode based on a monocrystalline silicon nanomembrane, and a poly (lactide-co-glycolide) (PLGA) dielectric interlayer.
The electronic components rest between two encapsulation layers of PLGA to isolate the active materials from the surrounding biofluids during implantation, and connect to a pair of flexible extension electrodes that deliver the electrical stimuli to a contact pad sutured onto the heart. The entire system is about 16 mm in width and 15 mm in length, and weighs in at about 0.3 g.
The pacemaker receives power and control commands through a wireless inductive power transfer – the same technology used in implanted medical devices, smartphones, and radio-frequency identification tags – between the receiver coil in the device and a wand-shaped, external transmission coil placed on top of or within a few inches of the heart.
“Right now we’re almost at 15 inches, which I think is a very respectable distance for this particular piece of hardware, and clinically very doable,” observed Dr. Arora.
Competing considerations
Testing thus far shows effective ventricular capture across a range of frequencies in mouse and rabbit hearts and successful pacing and activation of human cardiac tissue.
In vivo tests in dogs also suggest that the system can “achieve the power necessary for operation of bioresorbable pacemakers in adult human patients,” the authors say.
Electrodes placed on the dogs’ legs showed a change in ECG signals from a narrow QRS complex (consistent with a normal rate sinus rhythm of 350-400 bpm) to a widened QRS complex with a shortened R-R interval (consistent with a paced rhythm of 400-450 bpm) – indicating successful ventricular capture.
The device successfully paced the dogs through postoperative day 4 but couldn’t provide enough energy to capture the ventricular myocardium on day 5 and failed to pace the heart on day 6, even when transmitting voltages were increased from 1 Vpp to more than 10 Vpp.
Dr. Rogers pointed out that a transient device of theirs that uses very thin films of silica provides stable intracranial pressure monitoring for traumatic brain injury recovery for 3 weeks before dissolving. The problem with the polymers used as encapsulating layers in the pacemaker is that even if they haven’t completely dissolved, there’s a finite rate of water permeation through the film.
“It turns out that’s what’s become the limiting factor, rather than the chemistry of bioresorption,” he said. “So, what we’re seeing with these devices beginning to degrade electrically in terms of performance around 5-6 days is due to that water permeation.”
Although it is not part of the current study, there’s no reason thin silica layers couldn’t be incorporated into the pacemaker to make it less water permeable, Dr. Rogers said. Still, this will have to be weighed against the competing consideration of stable operating life.
The researchers specifically chose materials that would naturally bioresorb via hydrolysis and metabolic action in the body. PLGA degrades into glycolic and lactic acid, the tungsten-coated magnesium inductive coil into Wox and Mg(OH)2, and the silicon nanomembrane radiofrequency PIN diode into Si(OH)4.
CT imaging in rat models shows the device is enveloped in fibrotic tissue and completely decouples from the heart at 4 weeks, while images of explanted devices suggest the pacemaker largely dissolves within 3 weeks and the remaining residues disappear after 12 weeks.
The researchers have started an investigational device exemption process to allow the device to be used in clinical trials, and they plan to dig deeper into the potential for fragments to form at various stages of resorption, which some imaging suggests may occur.
“Because these devices are made out of pure materials and they’re in a heterogeneous environment, both mechanically and biomechanically, the devices don’t resorb in a perfectly uniform way and, as a result, at the tail end of the process you can end up with small fragments that eventually bioresorb, but before they’re gone, they are potentially mobile within the body cavity,” Dr. Rogers said.
“We feel that because the devices aren’t in the bloodstream, the risk associated with those fragments is probably manageable but at the same time, these are the sorts of details that must be thoroughly addressed before trials in humans,” he said, adding that one solution, if needed, would be to encapsulate the entire device in a thin bioresorbable hydrogel as a containment vehicle.
Dr. Arora said they hope the pacemaker “will make patients’ lives a lot easier in the postoperative setting but, even there, I think one must remember current pacing technology in this setting is actually very good. So there’s a word of caution not to get ahead of ourselves.”
Looking forward, the excitement of this approach is not only in the immediate postop setting but in the transvenous setting, he said. “If we can get to the point where we can actually do this transvenously, that opens up a huge window of opportunity because there we’re talking about post-TAVR [transcatheter aortic valve replacement], post–myocardial infarction, etc.”
Currently, temporary transvenous pacing can be quite unreliable because of a high risk of dislodgement and infection – much higher than for surgical pacing wires, he noted.
“In terms of translatability to larger numbers of patients, the value would be huge. But again, a lot needs to be done before we can get there. But if it can get to that point, then I think you have a real therapy that could potentially be transformative,” Dr. Arora said.
Dr. Rogers reported support from the Leducq Foundation projects RHYTHM and ROI-HL121270. Dr. Arora has disclosed no relevant financial relationships. Coauthor disclosures are listed in the original article.
A version of this article first appeared on Medscape.com.
A fully implantable, bioresorbable pacemaker has been developed that’s capable of sustaining heart rhythms in animal and human donor hearts before disappearing over 5-7 weeks.
Temporary pacing devices are frequently used after cardiac surgery but rely on bulky external generators and transcutaneous pacing leads that run the risk of becoming infected or dislodged and can damage the heart when removed if they’re enveloped in fibrotic tissue.
The experimental device is thin, powered without leads or batteries, and made of water-soluble, biocompatible materials, thereby bypassing many of the disadvantages of conventional temporary pacing devices, according to John A. Rogers, PhD, who led the device’s development and directs the Querrey Simpson Institute for Bioelectronics at Northwestern University in Chicago.
“The total material load on the body is very minimal,” he said in an interview. “The amount of silicon and magnesium in a multivitamin tablet is about 3,000 times more than the amount of those materials in our electronics. So you can think of them as a very tiny vitamin pill, in a sense, but configured with electronic functionality.”
Dr. Rogers and his team have a reputation for innovation in bioelectronic medicine, having recently constructed transient wireless devices to accelerate neuroregeneration associated with damaged peripheral nerves, to monitor critically ill neonates, and to detect early signs and symptoms associated with COVID-19.
Shortly after Dr. Rogers joined Northwestern, Rishi Arora, MD, a cardiac electrophysiologist and professor of medicine at Northwestern, reached out to discuss how they could leverage wireless electronics for patients needing temporary pacing.
“It was a natural marriage,” Dr. Arora said in an interview. “Part of the reason to go into the heart was because the cardiology group here at Northwestern, especially on the electrophysiology side, has been very involved in translational research, and John also had a very strong collaboration before he came here with Igor Efimov, [PhD, of George Washington University, Washington], a giant in the field in terms of heart rhythm research.”
Dr. Arora noted that the incidence of temporary pacing after cardiac surgery is at least 10% but can reach 20%. Current devices work well in most patients, but temporary pacing with epicardial wires can cause complications and, typically, work well only for a few days after cardiac surgery. Clinically, though, several patients need postoperative pacing support for 1-2 weeks.
“So if something like this were available where you could tack it onto the surface and forget it for a week or 10 days or 2 weeks, you’d be doing those 20% of patients a huge service,” he said.
Bioresorbable scaffold déjà vu?
The philosophy of “leave nothing behind” is nothing new in cardiology, with bioresorbable vascular scaffolds (BVS) gaining initial support as a potential solution to neoatherosclerosis and late-stent thrombosis in permanent metal stents. Failure to show advantages, and safety concerns such as in-scaffold thrombosis, however, led Abbott to stop global sales of the first approved BVS and Boston Scientific to halt its BVS program in 2017.
The wireless pacemaker, however, is an electrical device, not a mechanical one, observed Dr. Rogers. “The fact that it’s not in the bloodstream greatly lowers risks and, as I mentioned before, everything is super thin, low-mass quantities of materials. So, I guess there’s a relationship there, but it’s different in a couple of very important ways.”
As Dr. Rogers, Dr. Arora, Dr. Efimov, and colleagues recently reported in Nature Biotechnology, the electronic part of the pacemaker contains three layers: A loop antenna with a bilayer tungsten-coated magnesium inductive coil, a radiofrequency PIN diode based on a monocrystalline silicon nanomembrane, and a poly (lactide-co-glycolide) (PLGA) dielectric interlayer.
The electronic components rest between two encapsulation layers of PLGA to isolate the active materials from the surrounding biofluids during implantation, and connect to a pair of flexible extension electrodes that deliver the electrical stimuli to a contact pad sutured onto the heart. The entire system is about 16 mm in width and 15 mm in length, and weighs in at about 0.3 g.
The pacemaker receives power and control commands through a wireless inductive power transfer – the same technology used in implanted medical devices, smartphones, and radio-frequency identification tags – between the receiver coil in the device and a wand-shaped, external transmission coil placed on top of or within a few inches of the heart.
“Right now we’re almost at 15 inches, which I think is a very respectable distance for this particular piece of hardware, and clinically very doable,” observed Dr. Arora.
Competing considerations
Testing thus far shows effective ventricular capture across a range of frequencies in mouse and rabbit hearts and successful pacing and activation of human cardiac tissue.
In vivo tests in dogs also suggest that the system can “achieve the power necessary for operation of bioresorbable pacemakers in adult human patients,” the authors say.
Electrodes placed on the dogs’ legs showed a change in ECG signals from a narrow QRS complex (consistent with a normal rate sinus rhythm of 350-400 bpm) to a widened QRS complex with a shortened R-R interval (consistent with a paced rhythm of 400-450 bpm) – indicating successful ventricular capture.
The device successfully paced the dogs through postoperative day 4 but couldn’t provide enough energy to capture the ventricular myocardium on day 5 and failed to pace the heart on day 6, even when transmitting voltages were increased from 1 Vpp to more than 10 Vpp.
Dr. Rogers pointed out that a transient device of theirs that uses very thin films of silica provides stable intracranial pressure monitoring for traumatic brain injury recovery for 3 weeks before dissolving. The problem with the polymers used as encapsulating layers in the pacemaker is that even if they haven’t completely dissolved, there’s a finite rate of water permeation through the film.
“It turns out that’s what’s become the limiting factor, rather than the chemistry of bioresorption,” he said. “So, what we’re seeing with these devices beginning to degrade electrically in terms of performance around 5-6 days is due to that water permeation.”
Although it is not part of the current study, there’s no reason thin silica layers couldn’t be incorporated into the pacemaker to make it less water permeable, Dr. Rogers said. Still, this will have to be weighed against the competing consideration of stable operating life.
The researchers specifically chose materials that would naturally bioresorb via hydrolysis and metabolic action in the body. PLGA degrades into glycolic and lactic acid, the tungsten-coated magnesium inductive coil into Wox and Mg(OH)2, and the silicon nanomembrane radiofrequency PIN diode into Si(OH)4.
CT imaging in rat models shows the device is enveloped in fibrotic tissue and completely decouples from the heart at 4 weeks, while images of explanted devices suggest the pacemaker largely dissolves within 3 weeks and the remaining residues disappear after 12 weeks.
The researchers have started an investigational device exemption process to allow the device to be used in clinical trials, and they plan to dig deeper into the potential for fragments to form at various stages of resorption, which some imaging suggests may occur.
“Because these devices are made out of pure materials and they’re in a heterogeneous environment, both mechanically and biomechanically, the devices don’t resorb in a perfectly uniform way and, as a result, at the tail end of the process you can end up with small fragments that eventually bioresorb, but before they’re gone, they are potentially mobile within the body cavity,” Dr. Rogers said.
“We feel that because the devices aren’t in the bloodstream, the risk associated with those fragments is probably manageable but at the same time, these are the sorts of details that must be thoroughly addressed before trials in humans,” he said, adding that one solution, if needed, would be to encapsulate the entire device in a thin bioresorbable hydrogel as a containment vehicle.
Dr. Arora said they hope the pacemaker “will make patients’ lives a lot easier in the postoperative setting but, even there, I think one must remember current pacing technology in this setting is actually very good. So there’s a word of caution not to get ahead of ourselves.”
Looking forward, the excitement of this approach is not only in the immediate postop setting but in the transvenous setting, he said. “If we can get to the point where we can actually do this transvenously, that opens up a huge window of opportunity because there we’re talking about post-TAVR [transcatheter aortic valve replacement], post–myocardial infarction, etc.”
Currently, temporary transvenous pacing can be quite unreliable because of a high risk of dislodgement and infection – much higher than for surgical pacing wires, he noted.
“In terms of translatability to larger numbers of patients, the value would be huge. But again, a lot needs to be done before we can get there. But if it can get to that point, then I think you have a real therapy that could potentially be transformative,” Dr. Arora said.
Dr. Rogers reported support from the Leducq Foundation projects RHYTHM and ROI-HL121270. Dr. Arora has disclosed no relevant financial relationships. Coauthor disclosures are listed in the original article.
A version of this article first appeared on Medscape.com.
Five risk factors may predict thrombus on LAA occlusion implants
, itself an important risk factor for cerebrovascular events, in patients with implants for left atrial appendage occlusion (LAAO), new research suggests.
The identified independent predictors of DRT in the largest dedicated multicenter LAAO-DRT registry to date were presence of a hypercoagulability disorder, pericardial effusion, renal insufficiency, an implantation depth greater than 10 mm from the pulmonary ridge, and presence of nonparoxysmal atrial fibrillation (AFib).
“Unfortunately, most of them are not modifiable, like hypercoaguable disorders or nonparoxysmal atrial fibrillation. But we can avoid deep implants because that’s been associated with creating a little bit of a crater or valley where the clot can form,” senior author Mohamad Alkhouli, MD, said in an interview.
But most important, and “really why we wanted to do this,” he said, is that “we want to give the patient a realistic prediction of adverse events for this procedure.”
LAAO has taken off in recent years for preventing thrombus formation and stroke in patients with AFib. Predicting DRT is a priority for the LAAO field, the authors note, especially given its expansion to younger, lower-risk patients and the increasing procedural volumes.
“This is a problem, DRT, that’s been discussed a lot because this is a preventative procedure,” observed Dr. Alkhouli, professor of medicine at Mayo Medical School, Rochester, Minn.
“The actual stroke risk every year – even if you don’t take any blood thinner and you have a CHADsVASc score of 9, the highest – is 11%. So if the chance of having thrombus is close, then that’s not a good tradeoff.”
Previous studies have also identified implantation depth and nonparoxysmal AFib as risk factors for DRT. But most of them have been small, he noted, with one of the largest reporting 65 DRTs in four prospective trials.
To cast a wider net, the investigators, led by Trevor Simard, MD, also from the Mayo Clinic, invited more than 50 international sites to contribute data to the registry. Of these, 37 centers reported on 237 DRTs and 474 device-matched control subjects from the same site.
Three-fourths of patients received a first-generation Watchman or a FLEX device (Boston Scientific).
Medical regimens were similar between the DRT and control cohorts at discharge after LAA closure. Most patients were managed with single (36.3%) or dual antiplatelet therapy (26.2%) at the time of DRT diagnosis.
As reported July 19 in the Journal of the American College of Cardiology, the timing of DRT development varied widely, with 24.9% appearing in the first 45 days, 38.8% between days 45 and 180, 16.0% between days 180 to 365, and 20.3% beyond 1 year. At last known follow-up, one-quarter of patients had DRT.
The odds ratios for DRT associated with the five identified risk factors were:
- 17.50 (95% confidence interval, 3.39-90.45) for hypercoagulability disorder
- 13.45 (95% CI, 1.46-123.52) for pericardial effusion
- 4.02 (95% CI, 1.22-13.25) for renal insufficiency
- 2.41 (95% CI, 1.57-3.69) for implantation depth >10 mm
- 1.90 (95% CI, 1.22-2.97) for nonparoxysmal AFib
The risk for a composite of death, ischemic stroke, and systemic embolization was twofold higher in the DRT cohort than in the control cohort (29.5% vs. 14.4%; hazard ratio, 2.37; 95% CI, 1.58-3.56) and driven by a higher rate of ischemic stroke (16.9% vs. 3.6%; HR, 3.49; 95% CI, 1.35-9.00).
The incidence of bleeding and intracerebral hemorrhage, however, was similar in the DRT and control cohorts.
One of the surprises of the study was that medications prescribed in the short term after LAA closure were not associated with DRT, Dr. Alkhouli said. A previous meta-analysis of 66 studies by the investigators also found that antithrombotic regimen did not explain the heterogeneity of DRT formation.
“I think we’ll have to take that with a grain of salt, because there’s so many variations in the practice, and this is observational data. But that, in my mind, brings up a mechanistic issue,” he said.
It’s often recommended “that we should put patients on blood thinners for 3 months or 6 weeks, or whatever it is, to decrease the chance of thrombus, assuming the patients will have a normal endothelialization of the device,” Dr. Alkhouli said.
“Well, we know that’s not the reality,” he continued. “We know many patients don’t endothelialize, and, even if some patients do, there may be some endothelial damage. So I think the whole mechanism of prescribing a little bit of a blood thinner to avoid that risk may be missing the point. It’s a bit more complex than that, evidenced also by the fact that three-fourths of all the DRTs happened after 45 days, when patients are typically not taking a blood thinner.”
Based on the five independent risk factors, the investigators created a clinical DRT risk score that assigned 1 point for renal insufficiency, implantation depth greater than 10 mm from the pulmonary ridge, and nonparoxysmal AFib; and 4 points for iatrogenic pericardial effusion and for hypercoagulability disorder. Low risk was categorized as 1 point and high risk as 2 or more points.
The presence of one major risk factor or two minor risk factors, for example, led to a 2.1-fold increased risk for DRT, compared with those with no DRT risk factors.
The risk score will require validation in a prospective cohort but is “a step forward in addressing DRT” and triaging patients, Dr. Alkhouli said. The findings highlight the need to avoid deep device implantation and the importance of shared decision-making with patients, especially with those at high risk.
“And third, which is most important, I think, in my mind, is that it tells us not to put a blind eye to this topic and just say with improved devices it will go away,” he said. “That’s a bit unrealistic.”
In an accompanying editorial, Oussama Wazni, MD, Walid Saliba, MD, and Ayman A. Hussein, MD, all from the Cleveland Clinic, write that “the study sheds light on this yet unresolved issue, and the observations may help with risk stratification and optimization of procedural techniques.”
Whereas many of the nonmodifiable risk factors are helpful in shared decision-making decisions, they continue, “knowledge of these risk factors may not preclude implantation in patients who are otherwise at risk of both stroke off anticoagulation and bleeding on anticoagulation.”
Dr. Wazni and colleagues acknowledge that the small number of events in the study limits statistical power for definitive conclusions and say that further studies are needed to clarify the natural history of DRTs and their management, resolution, and impact on cardiovascular events.
Practitioners should also continue to cautiously assess for LAAO clinical indications for implant, according to the editorialists, who point out that the regulatory approval language in the United States was “flexible and nonspecific.”
“As the field grows wider, enhancing LAAO safety with optimal design, implantation, and periprocedural management is critically important, yet the main focus should remain on optimal patient selection for the purpose of achieving safe and successful outcomes,” the editorialists conclude.
Dr. Alkhouli has served as a consultant for Boston Scientific. Coauthor disclosures are listed in the paper. Dr. Wazni and Dr. Hussein have received research grant support from Boston Scientific. Dr. Wazni and Dr. Saliba have been consultants for Boston Scientific.
A version of this article first appeared on Medscape.com.
, itself an important risk factor for cerebrovascular events, in patients with implants for left atrial appendage occlusion (LAAO), new research suggests.
The identified independent predictors of DRT in the largest dedicated multicenter LAAO-DRT registry to date were presence of a hypercoagulability disorder, pericardial effusion, renal insufficiency, an implantation depth greater than 10 mm from the pulmonary ridge, and presence of nonparoxysmal atrial fibrillation (AFib).
“Unfortunately, most of them are not modifiable, like hypercoaguable disorders or nonparoxysmal atrial fibrillation. But we can avoid deep implants because that’s been associated with creating a little bit of a crater or valley where the clot can form,” senior author Mohamad Alkhouli, MD, said in an interview.
But most important, and “really why we wanted to do this,” he said, is that “we want to give the patient a realistic prediction of adverse events for this procedure.”
LAAO has taken off in recent years for preventing thrombus formation and stroke in patients with AFib. Predicting DRT is a priority for the LAAO field, the authors note, especially given its expansion to younger, lower-risk patients and the increasing procedural volumes.
“This is a problem, DRT, that’s been discussed a lot because this is a preventative procedure,” observed Dr. Alkhouli, professor of medicine at Mayo Medical School, Rochester, Minn.
“The actual stroke risk every year – even if you don’t take any blood thinner and you have a CHADsVASc score of 9, the highest – is 11%. So if the chance of having thrombus is close, then that’s not a good tradeoff.”
Previous studies have also identified implantation depth and nonparoxysmal AFib as risk factors for DRT. But most of them have been small, he noted, with one of the largest reporting 65 DRTs in four prospective trials.
To cast a wider net, the investigators, led by Trevor Simard, MD, also from the Mayo Clinic, invited more than 50 international sites to contribute data to the registry. Of these, 37 centers reported on 237 DRTs and 474 device-matched control subjects from the same site.
Three-fourths of patients received a first-generation Watchman or a FLEX device (Boston Scientific).
Medical regimens were similar between the DRT and control cohorts at discharge after LAA closure. Most patients were managed with single (36.3%) or dual antiplatelet therapy (26.2%) at the time of DRT diagnosis.
As reported July 19 in the Journal of the American College of Cardiology, the timing of DRT development varied widely, with 24.9% appearing in the first 45 days, 38.8% between days 45 and 180, 16.0% between days 180 to 365, and 20.3% beyond 1 year. At last known follow-up, one-quarter of patients had DRT.
The odds ratios for DRT associated with the five identified risk factors were:
- 17.50 (95% confidence interval, 3.39-90.45) for hypercoagulability disorder
- 13.45 (95% CI, 1.46-123.52) for pericardial effusion
- 4.02 (95% CI, 1.22-13.25) for renal insufficiency
- 2.41 (95% CI, 1.57-3.69) for implantation depth >10 mm
- 1.90 (95% CI, 1.22-2.97) for nonparoxysmal AFib
The risk for a composite of death, ischemic stroke, and systemic embolization was twofold higher in the DRT cohort than in the control cohort (29.5% vs. 14.4%; hazard ratio, 2.37; 95% CI, 1.58-3.56) and driven by a higher rate of ischemic stroke (16.9% vs. 3.6%; HR, 3.49; 95% CI, 1.35-9.00).
The incidence of bleeding and intracerebral hemorrhage, however, was similar in the DRT and control cohorts.
One of the surprises of the study was that medications prescribed in the short term after LAA closure were not associated with DRT, Dr. Alkhouli said. A previous meta-analysis of 66 studies by the investigators also found that antithrombotic regimen did not explain the heterogeneity of DRT formation.
“I think we’ll have to take that with a grain of salt, because there’s so many variations in the practice, and this is observational data. But that, in my mind, brings up a mechanistic issue,” he said.
It’s often recommended “that we should put patients on blood thinners for 3 months or 6 weeks, or whatever it is, to decrease the chance of thrombus, assuming the patients will have a normal endothelialization of the device,” Dr. Alkhouli said.
“Well, we know that’s not the reality,” he continued. “We know many patients don’t endothelialize, and, even if some patients do, there may be some endothelial damage. So I think the whole mechanism of prescribing a little bit of a blood thinner to avoid that risk may be missing the point. It’s a bit more complex than that, evidenced also by the fact that three-fourths of all the DRTs happened after 45 days, when patients are typically not taking a blood thinner.”
Based on the five independent risk factors, the investigators created a clinical DRT risk score that assigned 1 point for renal insufficiency, implantation depth greater than 10 mm from the pulmonary ridge, and nonparoxysmal AFib; and 4 points for iatrogenic pericardial effusion and for hypercoagulability disorder. Low risk was categorized as 1 point and high risk as 2 or more points.
The presence of one major risk factor or two minor risk factors, for example, led to a 2.1-fold increased risk for DRT, compared with those with no DRT risk factors.
The risk score will require validation in a prospective cohort but is “a step forward in addressing DRT” and triaging patients, Dr. Alkhouli said. The findings highlight the need to avoid deep device implantation and the importance of shared decision-making with patients, especially with those at high risk.
“And third, which is most important, I think, in my mind, is that it tells us not to put a blind eye to this topic and just say with improved devices it will go away,” he said. “That’s a bit unrealistic.”
In an accompanying editorial, Oussama Wazni, MD, Walid Saliba, MD, and Ayman A. Hussein, MD, all from the Cleveland Clinic, write that “the study sheds light on this yet unresolved issue, and the observations may help with risk stratification and optimization of procedural techniques.”
Whereas many of the nonmodifiable risk factors are helpful in shared decision-making decisions, they continue, “knowledge of these risk factors may not preclude implantation in patients who are otherwise at risk of both stroke off anticoagulation and bleeding on anticoagulation.”
Dr. Wazni and colleagues acknowledge that the small number of events in the study limits statistical power for definitive conclusions and say that further studies are needed to clarify the natural history of DRTs and their management, resolution, and impact on cardiovascular events.
Practitioners should also continue to cautiously assess for LAAO clinical indications for implant, according to the editorialists, who point out that the regulatory approval language in the United States was “flexible and nonspecific.”
“As the field grows wider, enhancing LAAO safety with optimal design, implantation, and periprocedural management is critically important, yet the main focus should remain on optimal patient selection for the purpose of achieving safe and successful outcomes,” the editorialists conclude.
Dr. Alkhouli has served as a consultant for Boston Scientific. Coauthor disclosures are listed in the paper. Dr. Wazni and Dr. Hussein have received research grant support from Boston Scientific. Dr. Wazni and Dr. Saliba have been consultants for Boston Scientific.
A version of this article first appeared on Medscape.com.
, itself an important risk factor for cerebrovascular events, in patients with implants for left atrial appendage occlusion (LAAO), new research suggests.
The identified independent predictors of DRT in the largest dedicated multicenter LAAO-DRT registry to date were presence of a hypercoagulability disorder, pericardial effusion, renal insufficiency, an implantation depth greater than 10 mm from the pulmonary ridge, and presence of nonparoxysmal atrial fibrillation (AFib).
“Unfortunately, most of them are not modifiable, like hypercoaguable disorders or nonparoxysmal atrial fibrillation. But we can avoid deep implants because that’s been associated with creating a little bit of a crater or valley where the clot can form,” senior author Mohamad Alkhouli, MD, said in an interview.
But most important, and “really why we wanted to do this,” he said, is that “we want to give the patient a realistic prediction of adverse events for this procedure.”
LAAO has taken off in recent years for preventing thrombus formation and stroke in patients with AFib. Predicting DRT is a priority for the LAAO field, the authors note, especially given its expansion to younger, lower-risk patients and the increasing procedural volumes.
“This is a problem, DRT, that’s been discussed a lot because this is a preventative procedure,” observed Dr. Alkhouli, professor of medicine at Mayo Medical School, Rochester, Minn.
“The actual stroke risk every year – even if you don’t take any blood thinner and you have a CHADsVASc score of 9, the highest – is 11%. So if the chance of having thrombus is close, then that’s not a good tradeoff.”
Previous studies have also identified implantation depth and nonparoxysmal AFib as risk factors for DRT. But most of them have been small, he noted, with one of the largest reporting 65 DRTs in four prospective trials.
To cast a wider net, the investigators, led by Trevor Simard, MD, also from the Mayo Clinic, invited more than 50 international sites to contribute data to the registry. Of these, 37 centers reported on 237 DRTs and 474 device-matched control subjects from the same site.
Three-fourths of patients received a first-generation Watchman or a FLEX device (Boston Scientific).
Medical regimens were similar between the DRT and control cohorts at discharge after LAA closure. Most patients were managed with single (36.3%) or dual antiplatelet therapy (26.2%) at the time of DRT diagnosis.
As reported July 19 in the Journal of the American College of Cardiology, the timing of DRT development varied widely, with 24.9% appearing in the first 45 days, 38.8% between days 45 and 180, 16.0% between days 180 to 365, and 20.3% beyond 1 year. At last known follow-up, one-quarter of patients had DRT.
The odds ratios for DRT associated with the five identified risk factors were:
- 17.50 (95% confidence interval, 3.39-90.45) for hypercoagulability disorder
- 13.45 (95% CI, 1.46-123.52) for pericardial effusion
- 4.02 (95% CI, 1.22-13.25) for renal insufficiency
- 2.41 (95% CI, 1.57-3.69) for implantation depth >10 mm
- 1.90 (95% CI, 1.22-2.97) for nonparoxysmal AFib
The risk for a composite of death, ischemic stroke, and systemic embolization was twofold higher in the DRT cohort than in the control cohort (29.5% vs. 14.4%; hazard ratio, 2.37; 95% CI, 1.58-3.56) and driven by a higher rate of ischemic stroke (16.9% vs. 3.6%; HR, 3.49; 95% CI, 1.35-9.00).
The incidence of bleeding and intracerebral hemorrhage, however, was similar in the DRT and control cohorts.
One of the surprises of the study was that medications prescribed in the short term after LAA closure were not associated with DRT, Dr. Alkhouli said. A previous meta-analysis of 66 studies by the investigators also found that antithrombotic regimen did not explain the heterogeneity of DRT formation.
“I think we’ll have to take that with a grain of salt, because there’s so many variations in the practice, and this is observational data. But that, in my mind, brings up a mechanistic issue,” he said.
It’s often recommended “that we should put patients on blood thinners for 3 months or 6 weeks, or whatever it is, to decrease the chance of thrombus, assuming the patients will have a normal endothelialization of the device,” Dr. Alkhouli said.
“Well, we know that’s not the reality,” he continued. “We know many patients don’t endothelialize, and, even if some patients do, there may be some endothelial damage. So I think the whole mechanism of prescribing a little bit of a blood thinner to avoid that risk may be missing the point. It’s a bit more complex than that, evidenced also by the fact that three-fourths of all the DRTs happened after 45 days, when patients are typically not taking a blood thinner.”
Based on the five independent risk factors, the investigators created a clinical DRT risk score that assigned 1 point for renal insufficiency, implantation depth greater than 10 mm from the pulmonary ridge, and nonparoxysmal AFib; and 4 points for iatrogenic pericardial effusion and for hypercoagulability disorder. Low risk was categorized as 1 point and high risk as 2 or more points.
The presence of one major risk factor or two minor risk factors, for example, led to a 2.1-fold increased risk for DRT, compared with those with no DRT risk factors.
The risk score will require validation in a prospective cohort but is “a step forward in addressing DRT” and triaging patients, Dr. Alkhouli said. The findings highlight the need to avoid deep device implantation and the importance of shared decision-making with patients, especially with those at high risk.
“And third, which is most important, I think, in my mind, is that it tells us not to put a blind eye to this topic and just say with improved devices it will go away,” he said. “That’s a bit unrealistic.”
In an accompanying editorial, Oussama Wazni, MD, Walid Saliba, MD, and Ayman A. Hussein, MD, all from the Cleveland Clinic, write that “the study sheds light on this yet unresolved issue, and the observations may help with risk stratification and optimization of procedural techniques.”
Whereas many of the nonmodifiable risk factors are helpful in shared decision-making decisions, they continue, “knowledge of these risk factors may not preclude implantation in patients who are otherwise at risk of both stroke off anticoagulation and bleeding on anticoagulation.”
Dr. Wazni and colleagues acknowledge that the small number of events in the study limits statistical power for definitive conclusions and say that further studies are needed to clarify the natural history of DRTs and their management, resolution, and impact on cardiovascular events.
Practitioners should also continue to cautiously assess for LAAO clinical indications for implant, according to the editorialists, who point out that the regulatory approval language in the United States was “flexible and nonspecific.”
“As the field grows wider, enhancing LAAO safety with optimal design, implantation, and periprocedural management is critically important, yet the main focus should remain on optimal patient selection for the purpose of achieving safe and successful outcomes,” the editorialists conclude.
Dr. Alkhouli has served as a consultant for Boston Scientific. Coauthor disclosures are listed in the paper. Dr. Wazni and Dr. Hussein have received research grant support from Boston Scientific. Dr. Wazni and Dr. Saliba have been consultants for Boston Scientific.
A version of this article first appeared on Medscape.com.
Drinking coffee not linked to increased arrhythmia risk in new study
In fact, an adjusted analysis found that “each additional cup of coffee intake was associated with a 3% lower risk of incident arrhythmia,” Eun-jeong Kim, MD, of the division of cardiology at the University of California, San Francisco, and colleagues reported in JAMA Internal Medicine.
In addition, genetic differences that affect caffeine metabolism did not significantly influence the odds of arrhythmias, the researchers found.
Still, these findings should not necessarily encourage people to start drinking coffee if they don’t already, or to guzzle additional cups with abandon, they said.
“We certainly don’t want to say drink coffee and it will reduce your risk of arrhythmias,” study author Gregory M. Marcus, MD, MAS, associate chief of cardiology for research at UCSF Health, said in an interview. “But rather, we think the main point is that a blanket prohibition against coffee or caffeine to reduce the risk of arrhythmias among patients who have a diagnosis of arrhythmias is likely unwarranted. And given some evidence that coffee consumption may actually have other benefits regarding diabetes, mood, and perhaps overall mortality, it may be problematic to admonish patients to avoid coffee or caffeine when it is not really warranted.”
Methods and results
The conventional wisdom that caffeine increases arrhythmic risk has not been well substantiated. To further examine whether moderate, habitual coffee drinking relates to arrhythmia risk, and whether certain genetic variants influence the association, Dr. Kim and colleagues analyzed data from the UK Biobank. They focused on longitudinal data collected between 2006 and 2018 from 386,258 people who did not have a prior diagnosis of arrhythmia.
Participants had an average age of 56 years, and about 52% were female. They provided information about their coffee consumption, and the researchers grouped the participants into eight categories based on their daily coffee intake: 0, less than 1, 1, 2, 3, 4, 5, and 6 or more cups per day.
Over an average follow-up of 4.5 years, 16,979 participants developed an incident arrhythmia. After adjusting for demographic characteristics, comorbid conditions, and lifestyle habits, the decreased risk with each cup of coffee was similar for atrial fibrillation or flutter (hazard ratio, 0.97) and supraventricular tachycardia (HR, 0.96).
Taking into account genetic variations that relate to caffeine metabolism did not modify the findings. Mendelian randomization analyses that used a polygenic score of inherited caffeine metabolism patterns “failed to provide evidence that caffeine consumption leads to a greater risk of arrhythmias,” the researchers said.
Professional society guidelines have suggested staying away from caffeinated products to reduce the risk of arrhythmia, but this guidance has “relied on assumed mechanisms and a small observational study from 1980,” the authors wrote. Subsequent research has indicated that coffee’s reputation of increasing the risk of arrhythmia may be undeserved.
“The investigators should be commended on performing a high-quality observational study to try to further understand the association between coffee consumption and arrhythmias, or the lack of one,” commented Zachary D. Goldberger, MD, MS, with the division of cardiovascular medicine at the University of Wisconsin–Madison, who was not involved in the study. “This is not a randomized, controlled trial, and coffee consumption was self-reported, but the methods employed are rigorous, despite these and other important limitations. However, we need to be extremely cautious in how we interpret these findings, and not use these data as a prescription for more coffee. It’s important to recognize that this study is not telling us to drink more coffee, or start drinking coffee, to protect against developing arrhythmias. However, it should offer more reassurance that moderate coffee consumption is not necessarily harmful, and will not always lead to arrhythmias. This is important, given the widespread notion that coffee is universally proarrhythmic.”
A call for personalized guidance
“As the investigators note, there are definitely biologically plausible reasons how coffee and caffeine may not cause arrhythmias, and may be possibly protective in some, despite being a stimulant,” Dr. Goldberger said. “However, if your patient is reporting palpitations or symptoms of an arrhythmia, and feels they be related to coffee or caffeine, we should not use this study to tell them that coffee may not be the culprit. We need to listen to our patients, and the decision to reduce coffee consumption to reduce these symptoms needs to be personalized.”
The effect size was small, and only about 4% of the participants developed an arrhythmia, Dr. Goldberger and Rodney A. Hayward, MD, wrote in an invited commentary on the study in JAMA Internal Medicine. Dr. Hayward is a professor of public health and internal medicine at the University of Michigan, Ann Arbor, and a senior investigator at the Ann Arbor Veterans Affairs Center for Clinical Management Research.
“Unfortunately, coffee consumption was self-reported at a single time point. Not only can this lead to recall bias, but subsequent and substantial changes in coffee consumption are also possible, including reductions due to new signs or symptoms,” they said.
No evidence that coffee ups risk for developing arrhythmias
Another recent study suggests that people may alter their coffee consumption depending on their baseline cardiovascular health, according to the commentary.
Overall, the results “strengthen the evidence that caffeine is not proarrhythmic, but they should not be taken as proving that coffee is an antiarrhythmic—this distinction is of paramount importance,” Dr. Goldberger and Dr. Hayward wrote. “Health care professionals can reassure patients that there is no evidence that drinking coffee increases the risk for developing arrhythmias. This is particularly important for the many patients with benign palpitations who are devastated when they think, or are told, that they have to stop drinking coffee. Given current evidence, this is entirely a patient-preference decision, not a medical one.”
Dr. Marcus, a cardiac electrophysiologist, sees patients with arrhythmias all the time. They tend to “come in fairly convinced that caffeine is to be avoided when they have arrhythmias,” he said. “Often, they been told by their primary care physician or their general cardiologist to avoid caffeine because they have an arrhythmia.
“What I suggest to my patients is that they feel free to go ahead and experiment and try coffee,” Dr. Marcus said.
Still, Dr. Marcus suspects that there are some individuals in whom caffeine is a trigger for the arrhythmia. But evidence indicates these cases likely are rare, and avoiding caffeine need not apply to the general population, particularly “given the potential health benefits of benefits of coffee and also, frankly, just the enhanced quality of life that people can enjoy drinking a good cup of coffee.”
The research was conducted using the UK Biobank resource, which was established by the Wellcome Trust, the Medical Research Council, the U.K. Department of Health, and the Scottish government. The UK Biobank has received funding from other agencies and foundations as well. Dr. Marcus disclosed grants from Baylis, Medtronic, and Eight Sleep outside the submitted work. In addition, he reported consulting for Johnson & Johnson and InCarda, and holding equity in InCarda. A coauthor received salary support from the National Institutes of Health during the study. Dr. Goldberger and Dr. Hayward disclosed no conflicts of interest.
In fact, an adjusted analysis found that “each additional cup of coffee intake was associated with a 3% lower risk of incident arrhythmia,” Eun-jeong Kim, MD, of the division of cardiology at the University of California, San Francisco, and colleagues reported in JAMA Internal Medicine.
In addition, genetic differences that affect caffeine metabolism did not significantly influence the odds of arrhythmias, the researchers found.
Still, these findings should not necessarily encourage people to start drinking coffee if they don’t already, or to guzzle additional cups with abandon, they said.
“We certainly don’t want to say drink coffee and it will reduce your risk of arrhythmias,” study author Gregory M. Marcus, MD, MAS, associate chief of cardiology for research at UCSF Health, said in an interview. “But rather, we think the main point is that a blanket prohibition against coffee or caffeine to reduce the risk of arrhythmias among patients who have a diagnosis of arrhythmias is likely unwarranted. And given some evidence that coffee consumption may actually have other benefits regarding diabetes, mood, and perhaps overall mortality, it may be problematic to admonish patients to avoid coffee or caffeine when it is not really warranted.”
Methods and results
The conventional wisdom that caffeine increases arrhythmic risk has not been well substantiated. To further examine whether moderate, habitual coffee drinking relates to arrhythmia risk, and whether certain genetic variants influence the association, Dr. Kim and colleagues analyzed data from the UK Biobank. They focused on longitudinal data collected between 2006 and 2018 from 386,258 people who did not have a prior diagnosis of arrhythmia.
Participants had an average age of 56 years, and about 52% were female. They provided information about their coffee consumption, and the researchers grouped the participants into eight categories based on their daily coffee intake: 0, less than 1, 1, 2, 3, 4, 5, and 6 or more cups per day.
Over an average follow-up of 4.5 years, 16,979 participants developed an incident arrhythmia. After adjusting for demographic characteristics, comorbid conditions, and lifestyle habits, the decreased risk with each cup of coffee was similar for atrial fibrillation or flutter (hazard ratio, 0.97) and supraventricular tachycardia (HR, 0.96).
Taking into account genetic variations that relate to caffeine metabolism did not modify the findings. Mendelian randomization analyses that used a polygenic score of inherited caffeine metabolism patterns “failed to provide evidence that caffeine consumption leads to a greater risk of arrhythmias,” the researchers said.
Professional society guidelines have suggested staying away from caffeinated products to reduce the risk of arrhythmia, but this guidance has “relied on assumed mechanisms and a small observational study from 1980,” the authors wrote. Subsequent research has indicated that coffee’s reputation of increasing the risk of arrhythmia may be undeserved.
“The investigators should be commended on performing a high-quality observational study to try to further understand the association between coffee consumption and arrhythmias, or the lack of one,” commented Zachary D. Goldberger, MD, MS, with the division of cardiovascular medicine at the University of Wisconsin–Madison, who was not involved in the study. “This is not a randomized, controlled trial, and coffee consumption was self-reported, but the methods employed are rigorous, despite these and other important limitations. However, we need to be extremely cautious in how we interpret these findings, and not use these data as a prescription for more coffee. It’s important to recognize that this study is not telling us to drink more coffee, or start drinking coffee, to protect against developing arrhythmias. However, it should offer more reassurance that moderate coffee consumption is not necessarily harmful, and will not always lead to arrhythmias. This is important, given the widespread notion that coffee is universally proarrhythmic.”
A call for personalized guidance
“As the investigators note, there are definitely biologically plausible reasons how coffee and caffeine may not cause arrhythmias, and may be possibly protective in some, despite being a stimulant,” Dr. Goldberger said. “However, if your patient is reporting palpitations or symptoms of an arrhythmia, and feels they be related to coffee or caffeine, we should not use this study to tell them that coffee may not be the culprit. We need to listen to our patients, and the decision to reduce coffee consumption to reduce these symptoms needs to be personalized.”
The effect size was small, and only about 4% of the participants developed an arrhythmia, Dr. Goldberger and Rodney A. Hayward, MD, wrote in an invited commentary on the study in JAMA Internal Medicine. Dr. Hayward is a professor of public health and internal medicine at the University of Michigan, Ann Arbor, and a senior investigator at the Ann Arbor Veterans Affairs Center for Clinical Management Research.
“Unfortunately, coffee consumption was self-reported at a single time point. Not only can this lead to recall bias, but subsequent and substantial changes in coffee consumption are also possible, including reductions due to new signs or symptoms,” they said.
No evidence that coffee ups risk for developing arrhythmias
Another recent study suggests that people may alter their coffee consumption depending on their baseline cardiovascular health, according to the commentary.
Overall, the results “strengthen the evidence that caffeine is not proarrhythmic, but they should not be taken as proving that coffee is an antiarrhythmic—this distinction is of paramount importance,” Dr. Goldberger and Dr. Hayward wrote. “Health care professionals can reassure patients that there is no evidence that drinking coffee increases the risk for developing arrhythmias. This is particularly important for the many patients with benign palpitations who are devastated when they think, or are told, that they have to stop drinking coffee. Given current evidence, this is entirely a patient-preference decision, not a medical one.”
Dr. Marcus, a cardiac electrophysiologist, sees patients with arrhythmias all the time. They tend to “come in fairly convinced that caffeine is to be avoided when they have arrhythmias,” he said. “Often, they been told by their primary care physician or their general cardiologist to avoid caffeine because they have an arrhythmia.
“What I suggest to my patients is that they feel free to go ahead and experiment and try coffee,” Dr. Marcus said.
Still, Dr. Marcus suspects that there are some individuals in whom caffeine is a trigger for the arrhythmia. But evidence indicates these cases likely are rare, and avoiding caffeine need not apply to the general population, particularly “given the potential health benefits of benefits of coffee and also, frankly, just the enhanced quality of life that people can enjoy drinking a good cup of coffee.”
The research was conducted using the UK Biobank resource, which was established by the Wellcome Trust, the Medical Research Council, the U.K. Department of Health, and the Scottish government. The UK Biobank has received funding from other agencies and foundations as well. Dr. Marcus disclosed grants from Baylis, Medtronic, and Eight Sleep outside the submitted work. In addition, he reported consulting for Johnson & Johnson and InCarda, and holding equity in InCarda. A coauthor received salary support from the National Institutes of Health during the study. Dr. Goldberger and Dr. Hayward disclosed no conflicts of interest.
In fact, an adjusted analysis found that “each additional cup of coffee intake was associated with a 3% lower risk of incident arrhythmia,” Eun-jeong Kim, MD, of the division of cardiology at the University of California, San Francisco, and colleagues reported in JAMA Internal Medicine.
In addition, genetic differences that affect caffeine metabolism did not significantly influence the odds of arrhythmias, the researchers found.
Still, these findings should not necessarily encourage people to start drinking coffee if they don’t already, or to guzzle additional cups with abandon, they said.
“We certainly don’t want to say drink coffee and it will reduce your risk of arrhythmias,” study author Gregory M. Marcus, MD, MAS, associate chief of cardiology for research at UCSF Health, said in an interview. “But rather, we think the main point is that a blanket prohibition against coffee or caffeine to reduce the risk of arrhythmias among patients who have a diagnosis of arrhythmias is likely unwarranted. And given some evidence that coffee consumption may actually have other benefits regarding diabetes, mood, and perhaps overall mortality, it may be problematic to admonish patients to avoid coffee or caffeine when it is not really warranted.”
Methods and results
The conventional wisdom that caffeine increases arrhythmic risk has not been well substantiated. To further examine whether moderate, habitual coffee drinking relates to arrhythmia risk, and whether certain genetic variants influence the association, Dr. Kim and colleagues analyzed data from the UK Biobank. They focused on longitudinal data collected between 2006 and 2018 from 386,258 people who did not have a prior diagnosis of arrhythmia.
Participants had an average age of 56 years, and about 52% were female. They provided information about their coffee consumption, and the researchers grouped the participants into eight categories based on their daily coffee intake: 0, less than 1, 1, 2, 3, 4, 5, and 6 or more cups per day.
Over an average follow-up of 4.5 years, 16,979 participants developed an incident arrhythmia. After adjusting for demographic characteristics, comorbid conditions, and lifestyle habits, the decreased risk with each cup of coffee was similar for atrial fibrillation or flutter (hazard ratio, 0.97) and supraventricular tachycardia (HR, 0.96).
Taking into account genetic variations that relate to caffeine metabolism did not modify the findings. Mendelian randomization analyses that used a polygenic score of inherited caffeine metabolism patterns “failed to provide evidence that caffeine consumption leads to a greater risk of arrhythmias,” the researchers said.
Professional society guidelines have suggested staying away from caffeinated products to reduce the risk of arrhythmia, but this guidance has “relied on assumed mechanisms and a small observational study from 1980,” the authors wrote. Subsequent research has indicated that coffee’s reputation of increasing the risk of arrhythmia may be undeserved.
“The investigators should be commended on performing a high-quality observational study to try to further understand the association between coffee consumption and arrhythmias, or the lack of one,” commented Zachary D. Goldberger, MD, MS, with the division of cardiovascular medicine at the University of Wisconsin–Madison, who was not involved in the study. “This is not a randomized, controlled trial, and coffee consumption was self-reported, but the methods employed are rigorous, despite these and other important limitations. However, we need to be extremely cautious in how we interpret these findings, and not use these data as a prescription for more coffee. It’s important to recognize that this study is not telling us to drink more coffee, or start drinking coffee, to protect against developing arrhythmias. However, it should offer more reassurance that moderate coffee consumption is not necessarily harmful, and will not always lead to arrhythmias. This is important, given the widespread notion that coffee is universally proarrhythmic.”
A call for personalized guidance
“As the investigators note, there are definitely biologically plausible reasons how coffee and caffeine may not cause arrhythmias, and may be possibly protective in some, despite being a stimulant,” Dr. Goldberger said. “However, if your patient is reporting palpitations or symptoms of an arrhythmia, and feels they be related to coffee or caffeine, we should not use this study to tell them that coffee may not be the culprit. We need to listen to our patients, and the decision to reduce coffee consumption to reduce these symptoms needs to be personalized.”
The effect size was small, and only about 4% of the participants developed an arrhythmia, Dr. Goldberger and Rodney A. Hayward, MD, wrote in an invited commentary on the study in JAMA Internal Medicine. Dr. Hayward is a professor of public health and internal medicine at the University of Michigan, Ann Arbor, and a senior investigator at the Ann Arbor Veterans Affairs Center for Clinical Management Research.
“Unfortunately, coffee consumption was self-reported at a single time point. Not only can this lead to recall bias, but subsequent and substantial changes in coffee consumption are also possible, including reductions due to new signs or symptoms,” they said.
No evidence that coffee ups risk for developing arrhythmias
Another recent study suggests that people may alter their coffee consumption depending on their baseline cardiovascular health, according to the commentary.
Overall, the results “strengthen the evidence that caffeine is not proarrhythmic, but they should not be taken as proving that coffee is an antiarrhythmic—this distinction is of paramount importance,” Dr. Goldberger and Dr. Hayward wrote. “Health care professionals can reassure patients that there is no evidence that drinking coffee increases the risk for developing arrhythmias. This is particularly important for the many patients with benign palpitations who are devastated when they think, or are told, that they have to stop drinking coffee. Given current evidence, this is entirely a patient-preference decision, not a medical one.”
Dr. Marcus, a cardiac electrophysiologist, sees patients with arrhythmias all the time. They tend to “come in fairly convinced that caffeine is to be avoided when they have arrhythmias,” he said. “Often, they been told by their primary care physician or their general cardiologist to avoid caffeine because they have an arrhythmia.
“What I suggest to my patients is that they feel free to go ahead and experiment and try coffee,” Dr. Marcus said.
Still, Dr. Marcus suspects that there are some individuals in whom caffeine is a trigger for the arrhythmia. But evidence indicates these cases likely are rare, and avoiding caffeine need not apply to the general population, particularly “given the potential health benefits of benefits of coffee and also, frankly, just the enhanced quality of life that people can enjoy drinking a good cup of coffee.”
The research was conducted using the UK Biobank resource, which was established by the Wellcome Trust, the Medical Research Council, the U.K. Department of Health, and the Scottish government. The UK Biobank has received funding from other agencies and foundations as well. Dr. Marcus disclosed grants from Baylis, Medtronic, and Eight Sleep outside the submitted work. In addition, he reported consulting for Johnson & Johnson and InCarda, and holding equity in InCarda. A coauthor received salary support from the National Institutes of Health during the study. Dr. Goldberger and Dr. Hayward disclosed no conflicts of interest.
FROM JAMA INTERNAL MEDICINE
St. Jude to pay $27 million to end DOJ suit over faulty ICDs
St. Jude Medical, now part of Abbott Laboratories, will pay the American government $27 million to settle allegations that it knowingly sold defective implantable cardiac defibrillators to health care facilities, which were implanted into patients, causing injuries and two deaths, the U.S. Department of Justice (DOJ) has announced.
“Medical device manufacturers have an obligation to be truthful with the Food and Drug Administration, and the U.S. government will not pay for devices that are unsafe and risk injury or death,” Jonathan F. Lenzner, Acting U.S. Attorney for the District of Maryland, said in a July 8 statement.
“The government contends that St. Jude knowingly caused the submission of false claims and failed to inform the FDA with critical information about prior injuries and a death which, had the FDA been made aware, would have led to a recall,” Mr. Lenzner added.
Those claims were submitted to the Medicare, TRICARE, and Federal Employees Health Benefits programs, according to the settlement agreement.
“The U.S. Attorney’s Office is committed to protecting Medicare and other federal health care programs from fraud, and in doing so, strengthen[ing] patient safety,” Mr. Lenzner said.
Premature battery depletion
The government alleges that St. Jude failed to disclose “serious adverse health events” related to premature battery depletion of certain models of its Fortify, Fortify Assura, Quadra, and Unify implantable defibrillators.
The government further alleges that, by 2013, St. Jude knew that lithium clusters could form on the batteries, causing them to short and run out of power. But it took until late 2014 for St. Jude to ask the FDA to approve a change to prevent lithium clusters from draining the battery.
And at this point, St. Jude told the FDA that “no serious injury, permanent harm, or deaths have been reported associated with this” issue, the government alleges.
However, according to the government’s allegations, St. Jude was aware at that time of two reported serious injuries and one death associated with the faulty batteries and continued to distribute devices that had been manufactured without the new design.
Not until August 2016 did St. Jude inform the FDA that the number of premature battery depletion events had increased to 729, including two deaths and 29 events associated with loss of pacing, the government alleges.
In October 2016, St. Jude issued a medical advisory regarding the battery problem, which the FDA classified as a Class I recall, the most serious type.
After the recall, St. Jude no longer sold the older devices, but thousands of them had been implanted into patients between November 2014 and October 2016.
In September 2017, as reported by this news organization, a nationwide class-action lawsuit was filed against St. Jude Medical and parent company Abbott Laboratories alleging that, despite knowing about a battery-depletion defect in some of its cardiac defibrillators as early as 2011, St. Jude failed to adequately report the risk and waited nearly 5 years before issuing a recall.
“To ensure the health and safety of patients, manufacturers of implantable cardiac devices must be transparent when communicating with the government about safety issues and incidents,” Acting Assistant Attorney General Brian Boynton, from the DOJ’s Civil Division, said in the DOJ statement announcing the settlement.
“We will hold accountable those companies whose conduct violates the law and puts patients’ health at risk,” Mr. Boynton said.
The civil settlement includes the resolution of claims brought under the qui tam, or whistleblower, provisions of the False Claims Act by Debbie Burke, a patient who received one of the devices that was subject to recall.
The claims resolved by the settlement are allegations only; there has been no determination of liability, the DOJ noted. St. Jude denies the allegations raised in the lawsuit.
A version of this article first appeared on Medscape.com.
St. Jude Medical, now part of Abbott Laboratories, will pay the American government $27 million to settle allegations that it knowingly sold defective implantable cardiac defibrillators to health care facilities, which were implanted into patients, causing injuries and two deaths, the U.S. Department of Justice (DOJ) has announced.
“Medical device manufacturers have an obligation to be truthful with the Food and Drug Administration, and the U.S. government will not pay for devices that are unsafe and risk injury or death,” Jonathan F. Lenzner, Acting U.S. Attorney for the District of Maryland, said in a July 8 statement.
“The government contends that St. Jude knowingly caused the submission of false claims and failed to inform the FDA with critical information about prior injuries and a death which, had the FDA been made aware, would have led to a recall,” Mr. Lenzner added.
Those claims were submitted to the Medicare, TRICARE, and Federal Employees Health Benefits programs, according to the settlement agreement.
“The U.S. Attorney’s Office is committed to protecting Medicare and other federal health care programs from fraud, and in doing so, strengthen[ing] patient safety,” Mr. Lenzner said.
Premature battery depletion
The government alleges that St. Jude failed to disclose “serious adverse health events” related to premature battery depletion of certain models of its Fortify, Fortify Assura, Quadra, and Unify implantable defibrillators.
The government further alleges that, by 2013, St. Jude knew that lithium clusters could form on the batteries, causing them to short and run out of power. But it took until late 2014 for St. Jude to ask the FDA to approve a change to prevent lithium clusters from draining the battery.
And at this point, St. Jude told the FDA that “no serious injury, permanent harm, or deaths have been reported associated with this” issue, the government alleges.
However, according to the government’s allegations, St. Jude was aware at that time of two reported serious injuries and one death associated with the faulty batteries and continued to distribute devices that had been manufactured without the new design.
Not until August 2016 did St. Jude inform the FDA that the number of premature battery depletion events had increased to 729, including two deaths and 29 events associated with loss of pacing, the government alleges.
In October 2016, St. Jude issued a medical advisory regarding the battery problem, which the FDA classified as a Class I recall, the most serious type.
After the recall, St. Jude no longer sold the older devices, but thousands of them had been implanted into patients between November 2014 and October 2016.
In September 2017, as reported by this news organization, a nationwide class-action lawsuit was filed against St. Jude Medical and parent company Abbott Laboratories alleging that, despite knowing about a battery-depletion defect in some of its cardiac defibrillators as early as 2011, St. Jude failed to adequately report the risk and waited nearly 5 years before issuing a recall.
“To ensure the health and safety of patients, manufacturers of implantable cardiac devices must be transparent when communicating with the government about safety issues and incidents,” Acting Assistant Attorney General Brian Boynton, from the DOJ’s Civil Division, said in the DOJ statement announcing the settlement.
“We will hold accountable those companies whose conduct violates the law and puts patients’ health at risk,” Mr. Boynton said.
The civil settlement includes the resolution of claims brought under the qui tam, or whistleblower, provisions of the False Claims Act by Debbie Burke, a patient who received one of the devices that was subject to recall.
The claims resolved by the settlement are allegations only; there has been no determination of liability, the DOJ noted. St. Jude denies the allegations raised in the lawsuit.
A version of this article first appeared on Medscape.com.
St. Jude Medical, now part of Abbott Laboratories, will pay the American government $27 million to settle allegations that it knowingly sold defective implantable cardiac defibrillators to health care facilities, which were implanted into patients, causing injuries and two deaths, the U.S. Department of Justice (DOJ) has announced.
“Medical device manufacturers have an obligation to be truthful with the Food and Drug Administration, and the U.S. government will not pay for devices that are unsafe and risk injury or death,” Jonathan F. Lenzner, Acting U.S. Attorney for the District of Maryland, said in a July 8 statement.
“The government contends that St. Jude knowingly caused the submission of false claims and failed to inform the FDA with critical information about prior injuries and a death which, had the FDA been made aware, would have led to a recall,” Mr. Lenzner added.
Those claims were submitted to the Medicare, TRICARE, and Federal Employees Health Benefits programs, according to the settlement agreement.
“The U.S. Attorney’s Office is committed to protecting Medicare and other federal health care programs from fraud, and in doing so, strengthen[ing] patient safety,” Mr. Lenzner said.
Premature battery depletion
The government alleges that St. Jude failed to disclose “serious adverse health events” related to premature battery depletion of certain models of its Fortify, Fortify Assura, Quadra, and Unify implantable defibrillators.
The government further alleges that, by 2013, St. Jude knew that lithium clusters could form on the batteries, causing them to short and run out of power. But it took until late 2014 for St. Jude to ask the FDA to approve a change to prevent lithium clusters from draining the battery.
And at this point, St. Jude told the FDA that “no serious injury, permanent harm, or deaths have been reported associated with this” issue, the government alleges.
However, according to the government’s allegations, St. Jude was aware at that time of two reported serious injuries and one death associated with the faulty batteries and continued to distribute devices that had been manufactured without the new design.
Not until August 2016 did St. Jude inform the FDA that the number of premature battery depletion events had increased to 729, including two deaths and 29 events associated with loss of pacing, the government alleges.
In October 2016, St. Jude issued a medical advisory regarding the battery problem, which the FDA classified as a Class I recall, the most serious type.
After the recall, St. Jude no longer sold the older devices, but thousands of them had been implanted into patients between November 2014 and October 2016.
In September 2017, as reported by this news organization, a nationwide class-action lawsuit was filed against St. Jude Medical and parent company Abbott Laboratories alleging that, despite knowing about a battery-depletion defect in some of its cardiac defibrillators as early as 2011, St. Jude failed to adequately report the risk and waited nearly 5 years before issuing a recall.
“To ensure the health and safety of patients, manufacturers of implantable cardiac devices must be transparent when communicating with the government about safety issues and incidents,” Acting Assistant Attorney General Brian Boynton, from the DOJ’s Civil Division, said in the DOJ statement announcing the settlement.
“We will hold accountable those companies whose conduct violates the law and puts patients’ health at risk,” Mr. Boynton said.
The civil settlement includes the resolution of claims brought under the qui tam, or whistleblower, provisions of the False Claims Act by Debbie Burke, a patient who received one of the devices that was subject to recall.
The claims resolved by the settlement are allegations only; there has been no determination of liability, the DOJ noted. St. Jude denies the allegations raised in the lawsuit.
A version of this article first appeared on Medscape.com.
CABANA: Ablation bests drugs for AFib in racial/ethnic minorities
CABANA, which was undertaken to compare catheter ablation and rate-control or rhythm-control drug therapy for AFib, concluded there was no significant difference between the two strategies in improving the trial’s composite primary outcome of death, disabling stroke, serious bleeding, or cardiac arrest.
But a closer look at a subgroup of participants reveals an important difference in outcome among racial and ethnic minorities.
In that group, which made up about 10% of the CABANA study population, catheter ablation was significantly better at treating AFib than was drug therapy, producing roughly a 70% relative reduction in the primary endpoint and all-cause mortality.
The benefit for catheter ablation, which was not seen in the nonminority participants, appeared to be due to worse outcomes with drug therapy, the investigators report in an article published July 5 in the Journal of the American College of Cardiology.
“The study really highlights the importance of trying to secure an inclusive and diverse population in clinical trials,” lead author Kevin L. Thomas, MD, Duke University, Durham, N.C., said in an interview.
“When we focused on the racial and ethnic minorities who were included in CABANA, the findings were different. This was a surprise,” Dr. Thomas said.
“The findings from the secondary analysis of CABANA suggest that racial and ethnic minorities that are treated with drugs compared with ablation do worse,” he said. “If we can validate this in a larger sample of patients and this does in fact turn out to be true, then we would change how we practice medicine. We would have discussions with these populations about the benefits of ablation over drugs, and this would be important information to help guide our practice.”
The investigators analyzed data from 1,280 participants enrolled in the North American arm of CABANA. Of these, 127 (9.9%) were of racial or ethnic minorities, as defined by the National Institutes of Health, and were randomly assigned to receive ablation (n = 62) or drug therapy (n = 65).
Compared with nonminorities, participants of racial and ethnic minorities were younger (median age, 65.5 years, vs. 68.5 years) and were more likely to have NYHA functional class greater than or equal to II symptoms (37.0% vs. 22.0%), hypertension (92.1% vs. 76.8%), and an ejection fraction less than 40% (20.8% vs. 7.1%).
The overall median follow-up was 54.9 months. Among ethnic and minority participants, the median follow-up was 48 months, compared with 55.5 months for the nonminority participants.
Although there was no significant difference in the primary composite endpoint in the main CABANA trial, among racial and ethnic minorities treated with ablation, there was a 68% relative reduction in the trial’s primary endpoint (adjusted hazard ratio, 0.32; 95% confidence interval, 0.13-0.78) and a 72% relative reduction in all-cause mortality (aHR, 0.28; 95% CI, 0.10-0.79).
The 4-year Kaplan-Meier primary event rates were similar in both racial/ethnic minority and nonminority groups that received catheter ablation (12.3% vs. 9.9%).
However, the 4-year event rate was much higher among nonminority participants than among racial and ethnic minorities who received drug therapy (27.4% vs. 9.4%).
The corresponding all-cause 4-year mortality rates were 8.1% and 6.7%, respectively, in the ablation arm and 20.2% and 4.5%, respectively, in the drug arm.
Dr. Thomas and colleagues point out that heart failure in racial and ethnic minorities, particularly Black patients, is typically due to hypertensive heart disease, whereas in non-Hispanic White patients, it is overwhelmingly associated with coronary artery disease. “Our results in CABANA, therefore, raise the possibility that the variations in the prevalence of the heart diseases associated with AFib might account for differences in the benefits observed with ablation therapy.”
Prior data suggest that AFib in the setting of heart failure with either reduced or preserved ejection fraction has substantially better clinical outcomes with ablation versus drug therapy, but most studies either do not report racial/ethnic demographics or enroll very low numbers of minorities, they note.
Andrea M. Russo, MD, a professor of medicine at Rowan University, Camden, New Jersey, asks why drug therapy might result in worse outcomes in racial and ethnic minorities in an accompanying editorial.
“Those who received ablation did better than those who received drugs, and the main reason for that is not that ablation works better in minorities than nonminorities, it’s because drugs are worse in minority patients than they are in nonminority patients. This means that either the way we are using the drugs or the ones that we are using in minority patients are resulting in worse overall outcomes,” Dr. Russo told this news organization.
“The minority patients were younger and yet had more hypertension at baseline. There could be all kinds of factors contributing to their health,” she said.
Dr. Russo agrees with Dr. Thomas on the need to enroll diverse populations in clinical trials.
“Dr. Thomas should be commended. He did a fabulous job of looking at this issue. It’s only 10% of the group, but it is better than what we have had so far, and this is a start,” Dr. Russo said. “It’s bringing recognition to how important it is to make sure that we include underrepresented populations in these trials and also that we offer all appropriate therapies to everyone.”
Dr. Thomas reports financial relationships with Janssen, Pfizer, Biosense Webster. Dr. Russo reports no relevant financial relationships. The study was funded by the National Institutes of Health, St. Jude Medical Foundation and Corporation, Biosense Webster, Medtronic, and Boston Scientific.
A version of this article first appeared on Medscape.com.
CABANA, which was undertaken to compare catheter ablation and rate-control or rhythm-control drug therapy for AFib, concluded there was no significant difference between the two strategies in improving the trial’s composite primary outcome of death, disabling stroke, serious bleeding, or cardiac arrest.
But a closer look at a subgroup of participants reveals an important difference in outcome among racial and ethnic minorities.
In that group, which made up about 10% of the CABANA study population, catheter ablation was significantly better at treating AFib than was drug therapy, producing roughly a 70% relative reduction in the primary endpoint and all-cause mortality.
The benefit for catheter ablation, which was not seen in the nonminority participants, appeared to be due to worse outcomes with drug therapy, the investigators report in an article published July 5 in the Journal of the American College of Cardiology.
“The study really highlights the importance of trying to secure an inclusive and diverse population in clinical trials,” lead author Kevin L. Thomas, MD, Duke University, Durham, N.C., said in an interview.
“When we focused on the racial and ethnic minorities who were included in CABANA, the findings were different. This was a surprise,” Dr. Thomas said.
“The findings from the secondary analysis of CABANA suggest that racial and ethnic minorities that are treated with drugs compared with ablation do worse,” he said. “If we can validate this in a larger sample of patients and this does in fact turn out to be true, then we would change how we practice medicine. We would have discussions with these populations about the benefits of ablation over drugs, and this would be important information to help guide our practice.”
The investigators analyzed data from 1,280 participants enrolled in the North American arm of CABANA. Of these, 127 (9.9%) were of racial or ethnic minorities, as defined by the National Institutes of Health, and were randomly assigned to receive ablation (n = 62) or drug therapy (n = 65).
Compared with nonminorities, participants of racial and ethnic minorities were younger (median age, 65.5 years, vs. 68.5 years) and were more likely to have NYHA functional class greater than or equal to II symptoms (37.0% vs. 22.0%), hypertension (92.1% vs. 76.8%), and an ejection fraction less than 40% (20.8% vs. 7.1%).
The overall median follow-up was 54.9 months. Among ethnic and minority participants, the median follow-up was 48 months, compared with 55.5 months for the nonminority participants.
Although there was no significant difference in the primary composite endpoint in the main CABANA trial, among racial and ethnic minorities treated with ablation, there was a 68% relative reduction in the trial’s primary endpoint (adjusted hazard ratio, 0.32; 95% confidence interval, 0.13-0.78) and a 72% relative reduction in all-cause mortality (aHR, 0.28; 95% CI, 0.10-0.79).
The 4-year Kaplan-Meier primary event rates were similar in both racial/ethnic minority and nonminority groups that received catheter ablation (12.3% vs. 9.9%).
However, the 4-year event rate was much higher among nonminority participants than among racial and ethnic minorities who received drug therapy (27.4% vs. 9.4%).
The corresponding all-cause 4-year mortality rates were 8.1% and 6.7%, respectively, in the ablation arm and 20.2% and 4.5%, respectively, in the drug arm.
Dr. Thomas and colleagues point out that heart failure in racial and ethnic minorities, particularly Black patients, is typically due to hypertensive heart disease, whereas in non-Hispanic White patients, it is overwhelmingly associated with coronary artery disease. “Our results in CABANA, therefore, raise the possibility that the variations in the prevalence of the heart diseases associated with AFib might account for differences in the benefits observed with ablation therapy.”
Prior data suggest that AFib in the setting of heart failure with either reduced or preserved ejection fraction has substantially better clinical outcomes with ablation versus drug therapy, but most studies either do not report racial/ethnic demographics or enroll very low numbers of minorities, they note.
Andrea M. Russo, MD, a professor of medicine at Rowan University, Camden, New Jersey, asks why drug therapy might result in worse outcomes in racial and ethnic minorities in an accompanying editorial.
“Those who received ablation did better than those who received drugs, and the main reason for that is not that ablation works better in minorities than nonminorities, it’s because drugs are worse in minority patients than they are in nonminority patients. This means that either the way we are using the drugs or the ones that we are using in minority patients are resulting in worse overall outcomes,” Dr. Russo told this news organization.
“The minority patients were younger and yet had more hypertension at baseline. There could be all kinds of factors contributing to their health,” she said.
Dr. Russo agrees with Dr. Thomas on the need to enroll diverse populations in clinical trials.
“Dr. Thomas should be commended. He did a fabulous job of looking at this issue. It’s only 10% of the group, but it is better than what we have had so far, and this is a start,” Dr. Russo said. “It’s bringing recognition to how important it is to make sure that we include underrepresented populations in these trials and also that we offer all appropriate therapies to everyone.”
Dr. Thomas reports financial relationships with Janssen, Pfizer, Biosense Webster. Dr. Russo reports no relevant financial relationships. The study was funded by the National Institutes of Health, St. Jude Medical Foundation and Corporation, Biosense Webster, Medtronic, and Boston Scientific.
A version of this article first appeared on Medscape.com.
CABANA, which was undertaken to compare catheter ablation and rate-control or rhythm-control drug therapy for AFib, concluded there was no significant difference between the two strategies in improving the trial’s composite primary outcome of death, disabling stroke, serious bleeding, or cardiac arrest.
But a closer look at a subgroup of participants reveals an important difference in outcome among racial and ethnic minorities.
In that group, which made up about 10% of the CABANA study population, catheter ablation was significantly better at treating AFib than was drug therapy, producing roughly a 70% relative reduction in the primary endpoint and all-cause mortality.
The benefit for catheter ablation, which was not seen in the nonminority participants, appeared to be due to worse outcomes with drug therapy, the investigators report in an article published July 5 in the Journal of the American College of Cardiology.
“The study really highlights the importance of trying to secure an inclusive and diverse population in clinical trials,” lead author Kevin L. Thomas, MD, Duke University, Durham, N.C., said in an interview.
“When we focused on the racial and ethnic minorities who were included in CABANA, the findings were different. This was a surprise,” Dr. Thomas said.
“The findings from the secondary analysis of CABANA suggest that racial and ethnic minorities that are treated with drugs compared with ablation do worse,” he said. “If we can validate this in a larger sample of patients and this does in fact turn out to be true, then we would change how we practice medicine. We would have discussions with these populations about the benefits of ablation over drugs, and this would be important information to help guide our practice.”
The investigators analyzed data from 1,280 participants enrolled in the North American arm of CABANA. Of these, 127 (9.9%) were of racial or ethnic minorities, as defined by the National Institutes of Health, and were randomly assigned to receive ablation (n = 62) or drug therapy (n = 65).
Compared with nonminorities, participants of racial and ethnic minorities were younger (median age, 65.5 years, vs. 68.5 years) and were more likely to have NYHA functional class greater than or equal to II symptoms (37.0% vs. 22.0%), hypertension (92.1% vs. 76.8%), and an ejection fraction less than 40% (20.8% vs. 7.1%).
The overall median follow-up was 54.9 months. Among ethnic and minority participants, the median follow-up was 48 months, compared with 55.5 months for the nonminority participants.
Although there was no significant difference in the primary composite endpoint in the main CABANA trial, among racial and ethnic minorities treated with ablation, there was a 68% relative reduction in the trial’s primary endpoint (adjusted hazard ratio, 0.32; 95% confidence interval, 0.13-0.78) and a 72% relative reduction in all-cause mortality (aHR, 0.28; 95% CI, 0.10-0.79).
The 4-year Kaplan-Meier primary event rates were similar in both racial/ethnic minority and nonminority groups that received catheter ablation (12.3% vs. 9.9%).
However, the 4-year event rate was much higher among nonminority participants than among racial and ethnic minorities who received drug therapy (27.4% vs. 9.4%).
The corresponding all-cause 4-year mortality rates were 8.1% and 6.7%, respectively, in the ablation arm and 20.2% and 4.5%, respectively, in the drug arm.
Dr. Thomas and colleagues point out that heart failure in racial and ethnic minorities, particularly Black patients, is typically due to hypertensive heart disease, whereas in non-Hispanic White patients, it is overwhelmingly associated with coronary artery disease. “Our results in CABANA, therefore, raise the possibility that the variations in the prevalence of the heart diseases associated with AFib might account for differences in the benefits observed with ablation therapy.”
Prior data suggest that AFib in the setting of heart failure with either reduced or preserved ejection fraction has substantially better clinical outcomes with ablation versus drug therapy, but most studies either do not report racial/ethnic demographics or enroll very low numbers of minorities, they note.
Andrea M. Russo, MD, a professor of medicine at Rowan University, Camden, New Jersey, asks why drug therapy might result in worse outcomes in racial and ethnic minorities in an accompanying editorial.
“Those who received ablation did better than those who received drugs, and the main reason for that is not that ablation works better in minorities than nonminorities, it’s because drugs are worse in minority patients than they are in nonminority patients. This means that either the way we are using the drugs or the ones that we are using in minority patients are resulting in worse overall outcomes,” Dr. Russo told this news organization.
“The minority patients were younger and yet had more hypertension at baseline. There could be all kinds of factors contributing to their health,” she said.
Dr. Russo agrees with Dr. Thomas on the need to enroll diverse populations in clinical trials.
“Dr. Thomas should be commended. He did a fabulous job of looking at this issue. It’s only 10% of the group, but it is better than what we have had so far, and this is a start,” Dr. Russo said. “It’s bringing recognition to how important it is to make sure that we include underrepresented populations in these trials and also that we offer all appropriate therapies to everyone.”
Dr. Thomas reports financial relationships with Janssen, Pfizer, Biosense Webster. Dr. Russo reports no relevant financial relationships. The study was funded by the National Institutes of Health, St. Jude Medical Foundation and Corporation, Biosense Webster, Medtronic, and Boston Scientific.
A version of this article first appeared on Medscape.com.
FDA to add myocarditis warning to mRNA COVID-19 vaccines
The Food and Drug Administration is adding a warning to mRNA COVID-19 vaccines’ fact sheets as medical experts continue to investigate cases of heart inflammation, which are rare but are more likely to occur in young men and teen boys.
Doran Fink, MD, PhD, deputy director of the FDA’s division of vaccines and related products applications, told a Centers for Disease Control and Prevention expert panel on June 23 that the FDA is finalizing language on a warning statement for health care providers, vaccine recipients, and parents or caregivers of teens.
The incidents are more likely to follow the second dose of the Pfizer or Moderna vaccine, with chest pain and other symptoms occurring within several days to a week, the warning will note.
“Based on limited follow-up, most cases appear to have been associated with resolution of symptoms, but limited information is available about potential long-term sequelae,” Dr. Fink said, describing the statement to the Advisory Committee on Immunization Practices, independent experts who advise the CDC.
“Symptoms suggestive of myocarditis or pericarditis should result in vaccine recipients seeking medical attention,” he said.
Benefits outweigh risks
Although no formal vote occurred after the meeting, the ACIP members delivered a strong endorsement for continuing to vaccinate 12- to 29-year-olds with the Pfizer and Moderna vaccines despite the warning.
“To me it’s clear, based on current information, that the benefits of vaccine clearly outweigh the risks,” said ACIP member Veronica McNally, president and CEO of the Franny Strong Foundation in Bloomfield, Mich., a sentiment echoed by other members.
As ACIP was meeting, leaders of the nation’s major physician, nurse, and public health associations issued a statement supporting continued vaccination: “The facts are clear: this is an extremely rare side effect, and only an exceedingly small number of people will experience it after vaccination.
“Importantly, for the young people who do, most cases are mild, and individuals recover often on their own or with minimal treatment. In addition, we know that myocarditis and pericarditis are much more common if you get COVID-19, and the risks to the heart from COVID-19 infection can be more severe.”
ACIP heard the evidence behind that claim. According to the Vaccine Safety Datalink, which contains data from more than 12 million medical records, myocarditis or pericarditis occurs in 12- to 39-year-olds at a rate of 8 per 1 million after the second Pfizer dose and 19.8 per 1 million after the second Moderna dose.
The CDC continues to investigate the link between the mRNA vaccines and heart inflammation, including any differences between the vaccines.
Most of the symptoms resolved quickly, said Tom Shimabukuro, deputy director of CDC’s Immunization Safety Office. Of 323 cases analyzed by the CDC, 309 were hospitalized, 295 were discharged, and 218, or 79%, had recovered from symptoms.
“Most postvaccine myocarditis has been responding to minimal treatment,” pediatric cardiologist Matthew Oster, MD, MPH, from Children’s Healthcare of Atlanta, told the panel.
COVID ‘risks are higher’
Overall, the CDC has reported 2,767 COVID-19 deaths among people aged 12-29 years, and there have been 4,018 reported cases of the COVID-linked inflammatory disorder MIS-C since the beginning of the pandemic.
That amounts to 1 MIS-C case in every 3,200 COVID infections – 36% of them among teens aged 12-20 years and 62% among children who are Hispanic or Black and non-Hispanic, according to a CDC presentation.
The CDC estimated that every 1 million second-dose COVID vaccines administered to 12- to 17-year-old boys could prevent 5,700 cases of COVID-19, 215 hospitalizations, 71 ICU admissions, and 2 deaths. There could also be 56-69 myocarditis cases.
The emergence of new variants in the United States and the skewed pattern of vaccination around the country also may increase the risk to unvaccinated young people, noted Grace Lee, MD, MPH, chair of the ACIP’s COVID-19 Vaccine Safety Technical Subgroup and a pediatric infectious disease physician at Stanford (Calif.) Children’s Health.
“If you’re in an area with low vaccination, the risks are higher,” she said. “The benefits [of the vaccine] are going to be far, far greater than any risk.”
Individuals, parents, and their clinicians should consider the full scope of risk when making decisions about vaccination, she said.
As the pandemic evolves, medical experts have to balance the known risks and benefits while they gather more information, said William Schaffner, MD, an infectious disease physician at Vanderbilt University, Nashville, Tenn., and medical director of the National Foundation for Infectious Diseases.
“The story is not over,” Dr. Schaffner said in an interview. “Clearly, we are still working in the face of a pandemic, so there’s urgency to continue vaccinating. But they would like to know more about the long-term consequences of the myocarditis.”
Booster possibilities
Meanwhile, ACIP began conversations on the parameters for a possible vaccine booster. For now, there are simply questions: Would a third vaccine help the immunocompromised gain protection? Should people get a different type of vaccine – mRNA versus adenovirus vector – for their booster? Most important, how long do antibodies last?
“Prior to going around giving everyone boosters, we really need to improve the overall vaccination coverage,” said Helen Keipp Talbot, MD, associate professor of medicine at Vanderbilt University. “That will protect everyone.”
A version of this article first appeared on Medscape.com.
The Food and Drug Administration is adding a warning to mRNA COVID-19 vaccines’ fact sheets as medical experts continue to investigate cases of heart inflammation, which are rare but are more likely to occur in young men and teen boys.
Doran Fink, MD, PhD, deputy director of the FDA’s division of vaccines and related products applications, told a Centers for Disease Control and Prevention expert panel on June 23 that the FDA is finalizing language on a warning statement for health care providers, vaccine recipients, and parents or caregivers of teens.
The incidents are more likely to follow the second dose of the Pfizer or Moderna vaccine, with chest pain and other symptoms occurring within several days to a week, the warning will note.
“Based on limited follow-up, most cases appear to have been associated with resolution of symptoms, but limited information is available about potential long-term sequelae,” Dr. Fink said, describing the statement to the Advisory Committee on Immunization Practices, independent experts who advise the CDC.
“Symptoms suggestive of myocarditis or pericarditis should result in vaccine recipients seeking medical attention,” he said.
Benefits outweigh risks
Although no formal vote occurred after the meeting, the ACIP members delivered a strong endorsement for continuing to vaccinate 12- to 29-year-olds with the Pfizer and Moderna vaccines despite the warning.
“To me it’s clear, based on current information, that the benefits of vaccine clearly outweigh the risks,” said ACIP member Veronica McNally, president and CEO of the Franny Strong Foundation in Bloomfield, Mich., a sentiment echoed by other members.
As ACIP was meeting, leaders of the nation’s major physician, nurse, and public health associations issued a statement supporting continued vaccination: “The facts are clear: this is an extremely rare side effect, and only an exceedingly small number of people will experience it after vaccination.
“Importantly, for the young people who do, most cases are mild, and individuals recover often on their own or with minimal treatment. In addition, we know that myocarditis and pericarditis are much more common if you get COVID-19, and the risks to the heart from COVID-19 infection can be more severe.”
ACIP heard the evidence behind that claim. According to the Vaccine Safety Datalink, which contains data from more than 12 million medical records, myocarditis or pericarditis occurs in 12- to 39-year-olds at a rate of 8 per 1 million after the second Pfizer dose and 19.8 per 1 million after the second Moderna dose.
The CDC continues to investigate the link between the mRNA vaccines and heart inflammation, including any differences between the vaccines.
Most of the symptoms resolved quickly, said Tom Shimabukuro, deputy director of CDC’s Immunization Safety Office. Of 323 cases analyzed by the CDC, 309 were hospitalized, 295 were discharged, and 218, or 79%, had recovered from symptoms.
“Most postvaccine myocarditis has been responding to minimal treatment,” pediatric cardiologist Matthew Oster, MD, MPH, from Children’s Healthcare of Atlanta, told the panel.
COVID ‘risks are higher’
Overall, the CDC has reported 2,767 COVID-19 deaths among people aged 12-29 years, and there have been 4,018 reported cases of the COVID-linked inflammatory disorder MIS-C since the beginning of the pandemic.
That amounts to 1 MIS-C case in every 3,200 COVID infections – 36% of them among teens aged 12-20 years and 62% among children who are Hispanic or Black and non-Hispanic, according to a CDC presentation.
The CDC estimated that every 1 million second-dose COVID vaccines administered to 12- to 17-year-old boys could prevent 5,700 cases of COVID-19, 215 hospitalizations, 71 ICU admissions, and 2 deaths. There could also be 56-69 myocarditis cases.
The emergence of new variants in the United States and the skewed pattern of vaccination around the country also may increase the risk to unvaccinated young people, noted Grace Lee, MD, MPH, chair of the ACIP’s COVID-19 Vaccine Safety Technical Subgroup and a pediatric infectious disease physician at Stanford (Calif.) Children’s Health.
“If you’re in an area with low vaccination, the risks are higher,” she said. “The benefits [of the vaccine] are going to be far, far greater than any risk.”
Individuals, parents, and their clinicians should consider the full scope of risk when making decisions about vaccination, she said.
As the pandemic evolves, medical experts have to balance the known risks and benefits while they gather more information, said William Schaffner, MD, an infectious disease physician at Vanderbilt University, Nashville, Tenn., and medical director of the National Foundation for Infectious Diseases.
“The story is not over,” Dr. Schaffner said in an interview. “Clearly, we are still working in the face of a pandemic, so there’s urgency to continue vaccinating. But they would like to know more about the long-term consequences of the myocarditis.”
Booster possibilities
Meanwhile, ACIP began conversations on the parameters for a possible vaccine booster. For now, there are simply questions: Would a third vaccine help the immunocompromised gain protection? Should people get a different type of vaccine – mRNA versus adenovirus vector – for their booster? Most important, how long do antibodies last?
“Prior to going around giving everyone boosters, we really need to improve the overall vaccination coverage,” said Helen Keipp Talbot, MD, associate professor of medicine at Vanderbilt University. “That will protect everyone.”
A version of this article first appeared on Medscape.com.
The Food and Drug Administration is adding a warning to mRNA COVID-19 vaccines’ fact sheets as medical experts continue to investigate cases of heart inflammation, which are rare but are more likely to occur in young men and teen boys.
Doran Fink, MD, PhD, deputy director of the FDA’s division of vaccines and related products applications, told a Centers for Disease Control and Prevention expert panel on June 23 that the FDA is finalizing language on a warning statement for health care providers, vaccine recipients, and parents or caregivers of teens.
The incidents are more likely to follow the second dose of the Pfizer or Moderna vaccine, with chest pain and other symptoms occurring within several days to a week, the warning will note.
“Based on limited follow-up, most cases appear to have been associated with resolution of symptoms, but limited information is available about potential long-term sequelae,” Dr. Fink said, describing the statement to the Advisory Committee on Immunization Practices, independent experts who advise the CDC.
“Symptoms suggestive of myocarditis or pericarditis should result in vaccine recipients seeking medical attention,” he said.
Benefits outweigh risks
Although no formal vote occurred after the meeting, the ACIP members delivered a strong endorsement for continuing to vaccinate 12- to 29-year-olds with the Pfizer and Moderna vaccines despite the warning.
“To me it’s clear, based on current information, that the benefits of vaccine clearly outweigh the risks,” said ACIP member Veronica McNally, president and CEO of the Franny Strong Foundation in Bloomfield, Mich., a sentiment echoed by other members.
As ACIP was meeting, leaders of the nation’s major physician, nurse, and public health associations issued a statement supporting continued vaccination: “The facts are clear: this is an extremely rare side effect, and only an exceedingly small number of people will experience it after vaccination.
“Importantly, for the young people who do, most cases are mild, and individuals recover often on their own or with minimal treatment. In addition, we know that myocarditis and pericarditis are much more common if you get COVID-19, and the risks to the heart from COVID-19 infection can be more severe.”
ACIP heard the evidence behind that claim. According to the Vaccine Safety Datalink, which contains data from more than 12 million medical records, myocarditis or pericarditis occurs in 12- to 39-year-olds at a rate of 8 per 1 million after the second Pfizer dose and 19.8 per 1 million after the second Moderna dose.
The CDC continues to investigate the link between the mRNA vaccines and heart inflammation, including any differences between the vaccines.
Most of the symptoms resolved quickly, said Tom Shimabukuro, deputy director of CDC’s Immunization Safety Office. Of 323 cases analyzed by the CDC, 309 were hospitalized, 295 were discharged, and 218, or 79%, had recovered from symptoms.
“Most postvaccine myocarditis has been responding to minimal treatment,” pediatric cardiologist Matthew Oster, MD, MPH, from Children’s Healthcare of Atlanta, told the panel.
COVID ‘risks are higher’
Overall, the CDC has reported 2,767 COVID-19 deaths among people aged 12-29 years, and there have been 4,018 reported cases of the COVID-linked inflammatory disorder MIS-C since the beginning of the pandemic.
That amounts to 1 MIS-C case in every 3,200 COVID infections – 36% of them among teens aged 12-20 years and 62% among children who are Hispanic or Black and non-Hispanic, according to a CDC presentation.
The CDC estimated that every 1 million second-dose COVID vaccines administered to 12- to 17-year-old boys could prevent 5,700 cases of COVID-19, 215 hospitalizations, 71 ICU admissions, and 2 deaths. There could also be 56-69 myocarditis cases.
The emergence of new variants in the United States and the skewed pattern of vaccination around the country also may increase the risk to unvaccinated young people, noted Grace Lee, MD, MPH, chair of the ACIP’s COVID-19 Vaccine Safety Technical Subgroup and a pediatric infectious disease physician at Stanford (Calif.) Children’s Health.
“If you’re in an area with low vaccination, the risks are higher,” she said. “The benefits [of the vaccine] are going to be far, far greater than any risk.”
Individuals, parents, and their clinicians should consider the full scope of risk when making decisions about vaccination, she said.
As the pandemic evolves, medical experts have to balance the known risks and benefits while they gather more information, said William Schaffner, MD, an infectious disease physician at Vanderbilt University, Nashville, Tenn., and medical director of the National Foundation for Infectious Diseases.
“The story is not over,” Dr. Schaffner said in an interview. “Clearly, we are still working in the face of a pandemic, so there’s urgency to continue vaccinating. But they would like to know more about the long-term consequences of the myocarditis.”
Booster possibilities
Meanwhile, ACIP began conversations on the parameters for a possible vaccine booster. For now, there are simply questions: Would a third vaccine help the immunocompromised gain protection? Should people get a different type of vaccine – mRNA versus adenovirus vector – for their booster? Most important, how long do antibodies last?
“Prior to going around giving everyone boosters, we really need to improve the overall vaccination coverage,” said Helen Keipp Talbot, MD, associate professor of medicine at Vanderbilt University. “That will protect everyone.”
A version of this article first appeared on Medscape.com.
Stroke risk in new-onset atrial fib goes up with greater alcohol intake
There’s abundant evidence linking higher alcohol intake levels to greater stroke risk and, separately, increasing risk for new-onset atrial fibrillation (AFib). Less settled is whether moderate to heavy drinking worsens the risk for stroke in patients already in AFib and whether giving up alcohol can attenuate that risk. A new observational study suggests the answer to both questions is yes.
The risk for ischemic stroke was only around 1% over about 5 years in a Korean nationwide cohort of almost 98,000 patients with new-onset AFib. About half the patients followed were nondrinkers, as they had been before the study, 13% became abstinent soon after their AFib diagnosis, and 36% were currently drinkers.
But stroke risk went up about 30% with “moderate” current alcohol intake, compared with no intake, and by more than 40% for current drinkers reporting “heavy” alcohol intake, researchers found in an adjusted analysis.
However, abstainers who had mild to moderate alcohol-intake levels before their AFib diagnosis “had a similar risk of ischemic stroke as nondrinkers,” write the authors, led by So-Ryoung Lee, MD, PhD, and colleagues, Seoul National University Hospital, Republic of Korea, in their report published June 7 in the European Heart Journal. In a secondary analysis, binge drinking was also independently associated with risk for ischemic stroke.
The findings suggest that “alcohol abstinence after the diagnosis of AFib could reduce the risk of ischemic stroke,” they conclude. “Lifestyle interventions, including attention to alcohol consumption, should be encouraged as part of a comprehensive approach in the management of patients with a new diagnosis of AFib” for lowering the risk for stroke and other clinical outcomes.
“These results are pretty comparable to those obtained in the more general population,” David Conen, MD, MPH, not connected to the analysis, told this news organization.
In the study’s population with new-onset AFib, there is an alcohol-dependent risk for stroke “that goes up with increasing alcohol intake, which is more or less similar to that found without atrial fibrillation in previous studies,” said Dr. Conen, from the Population Health Research Institute, McMaster University, Hamilton, Ont.
The study, “which overall I think is very well done,” he said, is noteworthy for also suggesting that binge drinking, which was scrutinized in a secondary analysis, appeared independently to worsen the risk for stroke in its AFib population.
Dr. Conen said the observed 1% overall risk for stroke was very similar to the rate he and his colleagues saw in a recent combined analysis of two European cohorts with AFib that was usually longer standing; the median was 3 years. That analysis, in contrast, showed no significant association between increasing levels of alcohol intake and risk for stroke or systemic embolism.
However, “our confidence limits did not exclude the possibility of a small to moderate association,” he said. Given that, and the current study from Korea, there might indeed be “a weak association between alcohol consumption and stroke” in patients with AFib.
“Their results are just more precise because of the larger sample size. That’s why they were able to show those associations,” said Dr. Conen, who was senior author on the earlier report, which covered a pooled analysis of 3,852 patients with AFib in the BEAT-AF and SWISS-AF cohort studies. It was published January 25 in CMAJ, with lead author Philipp Reddiess, MD, Cardiovascular Research Institute Basel, Switzerland.
The two published studies contrast in other ways that are worth noting and together suggest the stroke rate might have been 1% in both by chance, Dr. Conen said. “The populations were pretty different.”
In the earlier study, for example, the overwhelmingly European patients had more comorbidities and had been in AFib for much longer; their mean age was 71 years; and 84% were on oral anticoagulation (OAC).
In contrast, the Korean cohort averaged 61 years in age and only about 24% were taking oral anticoagulants. Given their distribution of CHA2DS2-VASc scores and mean score of 2.3, more than twice as many should have been on OAC, Dr. Conen speculated. “Even if you take into account that some patients may have contraindications, this is clearly an underanticoagulated population.”
The European cohort might have been “a little bit more representative because atrial fibrillation is a disease of the elderly,” Dr. Conen said, but “the Korean paper has the advantage of being a population-based study.”
It involved 97,869 patients from a Korean national data base who were newly diagnosed with AFib from 2010 to 2016. Of the total, 49,781 (51%) were continuously nondrinkers before and after their diagnosis; 12,789 (13%) abstained from alcohol only after their AFib diagnosis; and 35,299 (36%) were drinkers during the follow-up, either because they continued to drink or newly started after their diagnosis.
Of the cohort, 3,120 were diagnosed with new ischemic stroke over a follow-up of 310,926 person-years, for a rate of 1 per 100 person-years.
The adjusted hazard ratio (HR) for ischemic stroke over a 5-year follow-up, compared with nondrinkers, was:
- 1.127 (95% confidence interval, 1.003-1.266) among abstainers
- 1.280 (95% CI, 1.166-1.405) for current drinkers
The corresponding HR, compared with current drinkers, was:
- 0.781 (95% CI, 0.712-0.858) for nondrinkers
- 0.880 (95% CI, 0.782-0.990) among abstainers
No significant interactions with ischemic stroke risk were observed in groups by sex, age, CHA2DS2-VASc score, or smoking status. The risk rose consistently with current drinking levels.
The overall stroke rate of 1% per year is “very low,” and “the absolute differences are small, even though there is a clear significant trend from nondrinking to drinking,” Dr. Conen said.
However, “the difference becomes more sizable when you compare heavy drinking to abstinence.”
Dr. Lee reports no conflicts of interest; disclosures for the other authors are in their report. Dr. Conen reports receiving speaker fees from Servier Canada; disclosures for the other authors are in their report.
A version of this article first appeared on Medscape.com.
There’s abundant evidence linking higher alcohol intake levels to greater stroke risk and, separately, increasing risk for new-onset atrial fibrillation (AFib). Less settled is whether moderate to heavy drinking worsens the risk for stroke in patients already in AFib and whether giving up alcohol can attenuate that risk. A new observational study suggests the answer to both questions is yes.
The risk for ischemic stroke was only around 1% over about 5 years in a Korean nationwide cohort of almost 98,000 patients with new-onset AFib. About half the patients followed were nondrinkers, as they had been before the study, 13% became abstinent soon after their AFib diagnosis, and 36% were currently drinkers.
But stroke risk went up about 30% with “moderate” current alcohol intake, compared with no intake, and by more than 40% for current drinkers reporting “heavy” alcohol intake, researchers found in an adjusted analysis.
However, abstainers who had mild to moderate alcohol-intake levels before their AFib diagnosis “had a similar risk of ischemic stroke as nondrinkers,” write the authors, led by So-Ryoung Lee, MD, PhD, and colleagues, Seoul National University Hospital, Republic of Korea, in their report published June 7 in the European Heart Journal. In a secondary analysis, binge drinking was also independently associated with risk for ischemic stroke.
The findings suggest that “alcohol abstinence after the diagnosis of AFib could reduce the risk of ischemic stroke,” they conclude. “Lifestyle interventions, including attention to alcohol consumption, should be encouraged as part of a comprehensive approach in the management of patients with a new diagnosis of AFib” for lowering the risk for stroke and other clinical outcomes.
“These results are pretty comparable to those obtained in the more general population,” David Conen, MD, MPH, not connected to the analysis, told this news organization.
In the study’s population with new-onset AFib, there is an alcohol-dependent risk for stroke “that goes up with increasing alcohol intake, which is more or less similar to that found without atrial fibrillation in previous studies,” said Dr. Conen, from the Population Health Research Institute, McMaster University, Hamilton, Ont.
The study, “which overall I think is very well done,” he said, is noteworthy for also suggesting that binge drinking, which was scrutinized in a secondary analysis, appeared independently to worsen the risk for stroke in its AFib population.
Dr. Conen said the observed 1% overall risk for stroke was very similar to the rate he and his colleagues saw in a recent combined analysis of two European cohorts with AFib that was usually longer standing; the median was 3 years. That analysis, in contrast, showed no significant association between increasing levels of alcohol intake and risk for stroke or systemic embolism.
However, “our confidence limits did not exclude the possibility of a small to moderate association,” he said. Given that, and the current study from Korea, there might indeed be “a weak association between alcohol consumption and stroke” in patients with AFib.
“Their results are just more precise because of the larger sample size. That’s why they were able to show those associations,” said Dr. Conen, who was senior author on the earlier report, which covered a pooled analysis of 3,852 patients with AFib in the BEAT-AF and SWISS-AF cohort studies. It was published January 25 in CMAJ, with lead author Philipp Reddiess, MD, Cardiovascular Research Institute Basel, Switzerland.
The two published studies contrast in other ways that are worth noting and together suggest the stroke rate might have been 1% in both by chance, Dr. Conen said. “The populations were pretty different.”
In the earlier study, for example, the overwhelmingly European patients had more comorbidities and had been in AFib for much longer; their mean age was 71 years; and 84% were on oral anticoagulation (OAC).
In contrast, the Korean cohort averaged 61 years in age and only about 24% were taking oral anticoagulants. Given their distribution of CHA2DS2-VASc scores and mean score of 2.3, more than twice as many should have been on OAC, Dr. Conen speculated. “Even if you take into account that some patients may have contraindications, this is clearly an underanticoagulated population.”
The European cohort might have been “a little bit more representative because atrial fibrillation is a disease of the elderly,” Dr. Conen said, but “the Korean paper has the advantage of being a population-based study.”
It involved 97,869 patients from a Korean national data base who were newly diagnosed with AFib from 2010 to 2016. Of the total, 49,781 (51%) were continuously nondrinkers before and after their diagnosis; 12,789 (13%) abstained from alcohol only after their AFib diagnosis; and 35,299 (36%) were drinkers during the follow-up, either because they continued to drink or newly started after their diagnosis.
Of the cohort, 3,120 were diagnosed with new ischemic stroke over a follow-up of 310,926 person-years, for a rate of 1 per 100 person-years.
The adjusted hazard ratio (HR) for ischemic stroke over a 5-year follow-up, compared with nondrinkers, was:
- 1.127 (95% confidence interval, 1.003-1.266) among abstainers
- 1.280 (95% CI, 1.166-1.405) for current drinkers
The corresponding HR, compared with current drinkers, was:
- 0.781 (95% CI, 0.712-0.858) for nondrinkers
- 0.880 (95% CI, 0.782-0.990) among abstainers
No significant interactions with ischemic stroke risk were observed in groups by sex, age, CHA2DS2-VASc score, or smoking status. The risk rose consistently with current drinking levels.
The overall stroke rate of 1% per year is “very low,” and “the absolute differences are small, even though there is a clear significant trend from nondrinking to drinking,” Dr. Conen said.
However, “the difference becomes more sizable when you compare heavy drinking to abstinence.”
Dr. Lee reports no conflicts of interest; disclosures for the other authors are in their report. Dr. Conen reports receiving speaker fees from Servier Canada; disclosures for the other authors are in their report.
A version of this article first appeared on Medscape.com.
There’s abundant evidence linking higher alcohol intake levels to greater stroke risk and, separately, increasing risk for new-onset atrial fibrillation (AFib). Less settled is whether moderate to heavy drinking worsens the risk for stroke in patients already in AFib and whether giving up alcohol can attenuate that risk. A new observational study suggests the answer to both questions is yes.
The risk for ischemic stroke was only around 1% over about 5 years in a Korean nationwide cohort of almost 98,000 patients with new-onset AFib. About half the patients followed were nondrinkers, as they had been before the study, 13% became abstinent soon after their AFib diagnosis, and 36% were currently drinkers.
But stroke risk went up about 30% with “moderate” current alcohol intake, compared with no intake, and by more than 40% for current drinkers reporting “heavy” alcohol intake, researchers found in an adjusted analysis.
However, abstainers who had mild to moderate alcohol-intake levels before their AFib diagnosis “had a similar risk of ischemic stroke as nondrinkers,” write the authors, led by So-Ryoung Lee, MD, PhD, and colleagues, Seoul National University Hospital, Republic of Korea, in their report published June 7 in the European Heart Journal. In a secondary analysis, binge drinking was also independently associated with risk for ischemic stroke.
The findings suggest that “alcohol abstinence after the diagnosis of AFib could reduce the risk of ischemic stroke,” they conclude. “Lifestyle interventions, including attention to alcohol consumption, should be encouraged as part of a comprehensive approach in the management of patients with a new diagnosis of AFib” for lowering the risk for stroke and other clinical outcomes.
“These results are pretty comparable to those obtained in the more general population,” David Conen, MD, MPH, not connected to the analysis, told this news organization.
In the study’s population with new-onset AFib, there is an alcohol-dependent risk for stroke “that goes up with increasing alcohol intake, which is more or less similar to that found without atrial fibrillation in previous studies,” said Dr. Conen, from the Population Health Research Institute, McMaster University, Hamilton, Ont.
The study, “which overall I think is very well done,” he said, is noteworthy for also suggesting that binge drinking, which was scrutinized in a secondary analysis, appeared independently to worsen the risk for stroke in its AFib population.
Dr. Conen said the observed 1% overall risk for stroke was very similar to the rate he and his colleagues saw in a recent combined analysis of two European cohorts with AFib that was usually longer standing; the median was 3 years. That analysis, in contrast, showed no significant association between increasing levels of alcohol intake and risk for stroke or systemic embolism.
However, “our confidence limits did not exclude the possibility of a small to moderate association,” he said. Given that, and the current study from Korea, there might indeed be “a weak association between alcohol consumption and stroke” in patients with AFib.
“Their results are just more precise because of the larger sample size. That’s why they were able to show those associations,” said Dr. Conen, who was senior author on the earlier report, which covered a pooled analysis of 3,852 patients with AFib in the BEAT-AF and SWISS-AF cohort studies. It was published January 25 in CMAJ, with lead author Philipp Reddiess, MD, Cardiovascular Research Institute Basel, Switzerland.
The two published studies contrast in other ways that are worth noting and together suggest the stroke rate might have been 1% in both by chance, Dr. Conen said. “The populations were pretty different.”
In the earlier study, for example, the overwhelmingly European patients had more comorbidities and had been in AFib for much longer; their mean age was 71 years; and 84% were on oral anticoagulation (OAC).
In contrast, the Korean cohort averaged 61 years in age and only about 24% were taking oral anticoagulants. Given their distribution of CHA2DS2-VASc scores and mean score of 2.3, more than twice as many should have been on OAC, Dr. Conen speculated. “Even if you take into account that some patients may have contraindications, this is clearly an underanticoagulated population.”
The European cohort might have been “a little bit more representative because atrial fibrillation is a disease of the elderly,” Dr. Conen said, but “the Korean paper has the advantage of being a population-based study.”
It involved 97,869 patients from a Korean national data base who were newly diagnosed with AFib from 2010 to 2016. Of the total, 49,781 (51%) were continuously nondrinkers before and after their diagnosis; 12,789 (13%) abstained from alcohol only after their AFib diagnosis; and 35,299 (36%) were drinkers during the follow-up, either because they continued to drink or newly started after their diagnosis.
Of the cohort, 3,120 were diagnosed with new ischemic stroke over a follow-up of 310,926 person-years, for a rate of 1 per 100 person-years.
The adjusted hazard ratio (HR) for ischemic stroke over a 5-year follow-up, compared with nondrinkers, was:
- 1.127 (95% confidence interval, 1.003-1.266) among abstainers
- 1.280 (95% CI, 1.166-1.405) for current drinkers
The corresponding HR, compared with current drinkers, was:
- 0.781 (95% CI, 0.712-0.858) for nondrinkers
- 0.880 (95% CI, 0.782-0.990) among abstainers
No significant interactions with ischemic stroke risk were observed in groups by sex, age, CHA2DS2-VASc score, or smoking status. The risk rose consistently with current drinking levels.
The overall stroke rate of 1% per year is “very low,” and “the absolute differences are small, even though there is a clear significant trend from nondrinking to drinking,” Dr. Conen said.
However, “the difference becomes more sizable when you compare heavy drinking to abstinence.”
Dr. Lee reports no conflicts of interest; disclosures for the other authors are in their report. Dr. Conen reports receiving speaker fees from Servier Canada; disclosures for the other authors are in their report.
A version of this article first appeared on Medscape.com.
Reversal agents curb DOAC-related bleeding but deaths still high
Agents that reverse the effect of direct oral anticoagulants (DOACs) are highly effective in patients with severe bleeding, but mortality rates remain high despite their use, a meta-analysis shows.
Effective hemostasis was achieved in 78.5% of patients treated with a reversal agent, whereas failure to achieve hemostasis was associated with more than a threefold higher relative risk for death (relative risk, 3.63; 95% confidence interval, 2.56-5.16).
“This has implications in practice because it emphasizes the need for achieving effective hemostasis, if not with only one agent, trying other agents or treatment modalities, because it is a strong predictor of survival,” lead author Antonio Gómez-Outes, MD, PhD, said in an interview.
The bad news, he said, is that the mortality rate was still significant, at 17.7%, and approximately half of patients with DOAC-related severe intracranial bleeding survived with long-term moderate/severe disability.
“The lesson is to prevent these bleeding events because once they appear, even if you give an antidote, the outcome is poor, particularly for intracranial bleeding,” said Dr. Gómez-Outes, division of pharmacology and clinical drug evaluation, Spanish Agency for Medicines and Medical Devices, Madrid.
To put this in context, mortality rates were close to 50% after intracranial bleeding a decade ago when there were no antidotes or reversal agents, he observed. “So to some extent, patient care has improved, and the outcome has improved, but there is a long road to improve regarding disability.”
More than 100,000 DOAC-related major bleeding cases occur each year in the United States and European Union, Dr. Gómez-Outes said, and about half are severe enough to require hospitalization and potentially the use of a reversal agent. These include idarucizumab (Praxbind) for dabigatran reversal and prothombin complex concentrates (4CCC) or andexanet alpha (Andexxa) for reversal of direct factor Xa inhibitors like rivaroxaban, apixaban, and edoxaban.
As reported in the June 22 issue of the Journal of the American College of Cardiology, the meta-analysis comprised 4,735 patients (mean age, 77 years; 57% male) with severe DOAC-related bleeding who received 4PCC (n = 2,688), idarucizumab (n = 1,111), or andexanet (n = 936) in 60 studies between January 2010 and December 2020.
Atrial fibrillation (AFib) was the most common reason for use of a DOAC (82%), followed by venous thromboembolism (14%). Rivaroxaban was used in 36%, apixaban in 32%, dabigatran in 31%, and edoxaban in 1%.
The index bleeding event was intracranial hemorrhage (ICH) in 55%. Anticoagulation was restarted in 57% of patients an average of 11 days after admission.
Mortality rates were 20.2% in patients with ICH and 15.4% in those with extracranial bleeding. There were no differences in death rates by reversal agent used, type of study, risk for bias, or study sponsorship in meta-regression analysis.
Rebleeding occurred in 13.2% of patients; 82.0% of these events were described as an ICH, and 78.0% occurred after anticoagulation was restarted.
The overall rate of thromboembolism was 4.6%. The risk was particularly high with andexanet, at 10.7%, and relatively low with idarucizumab (3.8%) and 4PCC (4.3%), the authors note.
“Our meta-analysis suggests specific reversal with andexanet is not superior to unspecific reversal with 4PCC, and that’s good news because many centers, in many countries, have no access to specific antidotes that are more costly,” Dr. Gómez-Outes said. “4PCC is an effective and relatively safe drug, so it’s still a good option for these patients.”
Labeling for andexanet includes a warning for thromboembolic events, but in the absence of direct comparisons, the findings should be interpreted with caution, he added. Further insights are expected from an ongoing randomized trial of andexanet and standard of care in 900 patients who present with acute ICH less than 15 hours after taking an oral factor Xa inhibitor. The preliminary completion date is set for 2023.
“The meta-analysis raises awareness about the rates of mortality and thromboembolism after reversal agent administration, although understanding the implications of these data is challenging,” Christopher Granger, MD, and Sean P. Pokomey, MD, MBA, Duke University Medical Center, Durham, N.C., say in an accompanying editorial.
The fact that failure to achieve hemostasis was associated with death is expected and might be related to the way hemostasis was defined, rather than the actual failure of the hemostatic treatments, they suggest. “The prothrombotic effects of each agent, including andexanet, need to be better understood, as clinicians work toward including reversal agents into algorithms for bleeding management.”
Effective hemostasis was defined in the studies through various methods as: “Excellent/good” using the Sarode and ANNEXA-4 scales; “yes” in the International Society on Thrombosis and Hemostasis Scale; and with other scales and through clinical judgment.
Although the size of the meta-analysis dwarfs previous reviews, the editorialists and authors point out that 47 of the 60 studies were retrospective, only two had control groups, and 45 had a high risk for bias.
In general, there was also poor reporting of key clinical data, such as postbleeding anticoagulation management, and a limitation of the mortality analysis is that it was based in selected patients with effective hemostasis assessed within 48 hours, which may not capture early deaths, the authors note.
“The morbidity and mortality from ischemic strokes as a result of undertreatment of stroke prevention in patients with AFib continue to dwarf the bleeding related mortality among patients with AFib and on DOACs, and thus the number one priority is to treat nearly all patients with AFib with a DOAC,” Dr. Granger and Dr. Pokomey conclude. “The availability of reversal agents for DOACs should provide reassurance, with another tool in our armamentarium, to providers to prescribe OACs for stroke prevention.”
No funding/grant support was received to conduct the study. Coauthor Ramón Lecumberri has received personal fees from Boehringer Ingelheim and Bristol Myers Squibb outside the submitted work. All other authors report no relevant financial relationships. Dr. Granger has received research and consulting fees from Bristol Myers Squibb, Pfizer, Boehringer Ingelheim, Bayer, Janssen, Boston Scientific, Apple, AstraZeneca, Novartis, AbbVie, Biomed, CeleCor, GSK, Novartis, Medtronic, Merck, Novo Nordisk, Philips, Rho, and the U.S. Food and Drug Administration. Dr. Pokomey has received modest consulting support from Bristol Myers Squibb, Pfizer, Boston Scientific, Medtronic, Janssen, and Zoll; modest research support from Gilead, Boston Scientific, Bristol Myers Squibb, Pfizer, and Janssen; and significant research support from the FDA.
A version of this article first appeared on Medscape.com.
Agents that reverse the effect of direct oral anticoagulants (DOACs) are highly effective in patients with severe bleeding, but mortality rates remain high despite their use, a meta-analysis shows.
Effective hemostasis was achieved in 78.5% of patients treated with a reversal agent, whereas failure to achieve hemostasis was associated with more than a threefold higher relative risk for death (relative risk, 3.63; 95% confidence interval, 2.56-5.16).
“This has implications in practice because it emphasizes the need for achieving effective hemostasis, if not with only one agent, trying other agents or treatment modalities, because it is a strong predictor of survival,” lead author Antonio Gómez-Outes, MD, PhD, said in an interview.
The bad news, he said, is that the mortality rate was still significant, at 17.7%, and approximately half of patients with DOAC-related severe intracranial bleeding survived with long-term moderate/severe disability.
“The lesson is to prevent these bleeding events because once they appear, even if you give an antidote, the outcome is poor, particularly for intracranial bleeding,” said Dr. Gómez-Outes, division of pharmacology and clinical drug evaluation, Spanish Agency for Medicines and Medical Devices, Madrid.
To put this in context, mortality rates were close to 50% after intracranial bleeding a decade ago when there were no antidotes or reversal agents, he observed. “So to some extent, patient care has improved, and the outcome has improved, but there is a long road to improve regarding disability.”
More than 100,000 DOAC-related major bleeding cases occur each year in the United States and European Union, Dr. Gómez-Outes said, and about half are severe enough to require hospitalization and potentially the use of a reversal agent. These include idarucizumab (Praxbind) for dabigatran reversal and prothombin complex concentrates (4CCC) or andexanet alpha (Andexxa) for reversal of direct factor Xa inhibitors like rivaroxaban, apixaban, and edoxaban.
As reported in the June 22 issue of the Journal of the American College of Cardiology, the meta-analysis comprised 4,735 patients (mean age, 77 years; 57% male) with severe DOAC-related bleeding who received 4PCC (n = 2,688), idarucizumab (n = 1,111), or andexanet (n = 936) in 60 studies between January 2010 and December 2020.
Atrial fibrillation (AFib) was the most common reason for use of a DOAC (82%), followed by venous thromboembolism (14%). Rivaroxaban was used in 36%, apixaban in 32%, dabigatran in 31%, and edoxaban in 1%.
The index bleeding event was intracranial hemorrhage (ICH) in 55%. Anticoagulation was restarted in 57% of patients an average of 11 days after admission.
Mortality rates were 20.2% in patients with ICH and 15.4% in those with extracranial bleeding. There were no differences in death rates by reversal agent used, type of study, risk for bias, or study sponsorship in meta-regression analysis.
Rebleeding occurred in 13.2% of patients; 82.0% of these events were described as an ICH, and 78.0% occurred after anticoagulation was restarted.
The overall rate of thromboembolism was 4.6%. The risk was particularly high with andexanet, at 10.7%, and relatively low with idarucizumab (3.8%) and 4PCC (4.3%), the authors note.
“Our meta-analysis suggests specific reversal with andexanet is not superior to unspecific reversal with 4PCC, and that’s good news because many centers, in many countries, have no access to specific antidotes that are more costly,” Dr. Gómez-Outes said. “4PCC is an effective and relatively safe drug, so it’s still a good option for these patients.”
Labeling for andexanet includes a warning for thromboembolic events, but in the absence of direct comparisons, the findings should be interpreted with caution, he added. Further insights are expected from an ongoing randomized trial of andexanet and standard of care in 900 patients who present with acute ICH less than 15 hours after taking an oral factor Xa inhibitor. The preliminary completion date is set for 2023.
“The meta-analysis raises awareness about the rates of mortality and thromboembolism after reversal agent administration, although understanding the implications of these data is challenging,” Christopher Granger, MD, and Sean P. Pokomey, MD, MBA, Duke University Medical Center, Durham, N.C., say in an accompanying editorial.
The fact that failure to achieve hemostasis was associated with death is expected and might be related to the way hemostasis was defined, rather than the actual failure of the hemostatic treatments, they suggest. “The prothrombotic effects of each agent, including andexanet, need to be better understood, as clinicians work toward including reversal agents into algorithms for bleeding management.”
Effective hemostasis was defined in the studies through various methods as: “Excellent/good” using the Sarode and ANNEXA-4 scales; “yes” in the International Society on Thrombosis and Hemostasis Scale; and with other scales and through clinical judgment.
Although the size of the meta-analysis dwarfs previous reviews, the editorialists and authors point out that 47 of the 60 studies were retrospective, only two had control groups, and 45 had a high risk for bias.
In general, there was also poor reporting of key clinical data, such as postbleeding anticoagulation management, and a limitation of the mortality analysis is that it was based in selected patients with effective hemostasis assessed within 48 hours, which may not capture early deaths, the authors note.
“The morbidity and mortality from ischemic strokes as a result of undertreatment of stroke prevention in patients with AFib continue to dwarf the bleeding related mortality among patients with AFib and on DOACs, and thus the number one priority is to treat nearly all patients with AFib with a DOAC,” Dr. Granger and Dr. Pokomey conclude. “The availability of reversal agents for DOACs should provide reassurance, with another tool in our armamentarium, to providers to prescribe OACs for stroke prevention.”
No funding/grant support was received to conduct the study. Coauthor Ramón Lecumberri has received personal fees from Boehringer Ingelheim and Bristol Myers Squibb outside the submitted work. All other authors report no relevant financial relationships. Dr. Granger has received research and consulting fees from Bristol Myers Squibb, Pfizer, Boehringer Ingelheim, Bayer, Janssen, Boston Scientific, Apple, AstraZeneca, Novartis, AbbVie, Biomed, CeleCor, GSK, Novartis, Medtronic, Merck, Novo Nordisk, Philips, Rho, and the U.S. Food and Drug Administration. Dr. Pokomey has received modest consulting support from Bristol Myers Squibb, Pfizer, Boston Scientific, Medtronic, Janssen, and Zoll; modest research support from Gilead, Boston Scientific, Bristol Myers Squibb, Pfizer, and Janssen; and significant research support from the FDA.
A version of this article first appeared on Medscape.com.
Agents that reverse the effect of direct oral anticoagulants (DOACs) are highly effective in patients with severe bleeding, but mortality rates remain high despite their use, a meta-analysis shows.
Effective hemostasis was achieved in 78.5% of patients treated with a reversal agent, whereas failure to achieve hemostasis was associated with more than a threefold higher relative risk for death (relative risk, 3.63; 95% confidence interval, 2.56-5.16).
“This has implications in practice because it emphasizes the need for achieving effective hemostasis, if not with only one agent, trying other agents or treatment modalities, because it is a strong predictor of survival,” lead author Antonio Gómez-Outes, MD, PhD, said in an interview.
The bad news, he said, is that the mortality rate was still significant, at 17.7%, and approximately half of patients with DOAC-related severe intracranial bleeding survived with long-term moderate/severe disability.
“The lesson is to prevent these bleeding events because once they appear, even if you give an antidote, the outcome is poor, particularly for intracranial bleeding,” said Dr. Gómez-Outes, division of pharmacology and clinical drug evaluation, Spanish Agency for Medicines and Medical Devices, Madrid.
To put this in context, mortality rates were close to 50% after intracranial bleeding a decade ago when there were no antidotes or reversal agents, he observed. “So to some extent, patient care has improved, and the outcome has improved, but there is a long road to improve regarding disability.”
More than 100,000 DOAC-related major bleeding cases occur each year in the United States and European Union, Dr. Gómez-Outes said, and about half are severe enough to require hospitalization and potentially the use of a reversal agent. These include idarucizumab (Praxbind) for dabigatran reversal and prothombin complex concentrates (4CCC) or andexanet alpha (Andexxa) for reversal of direct factor Xa inhibitors like rivaroxaban, apixaban, and edoxaban.
As reported in the June 22 issue of the Journal of the American College of Cardiology, the meta-analysis comprised 4,735 patients (mean age, 77 years; 57% male) with severe DOAC-related bleeding who received 4PCC (n = 2,688), idarucizumab (n = 1,111), or andexanet (n = 936) in 60 studies between January 2010 and December 2020.
Atrial fibrillation (AFib) was the most common reason for use of a DOAC (82%), followed by venous thromboembolism (14%). Rivaroxaban was used in 36%, apixaban in 32%, dabigatran in 31%, and edoxaban in 1%.
The index bleeding event was intracranial hemorrhage (ICH) in 55%. Anticoagulation was restarted in 57% of patients an average of 11 days after admission.
Mortality rates were 20.2% in patients with ICH and 15.4% in those with extracranial bleeding. There were no differences in death rates by reversal agent used, type of study, risk for bias, or study sponsorship in meta-regression analysis.
Rebleeding occurred in 13.2% of patients; 82.0% of these events were described as an ICH, and 78.0% occurred after anticoagulation was restarted.
The overall rate of thromboembolism was 4.6%. The risk was particularly high with andexanet, at 10.7%, and relatively low with idarucizumab (3.8%) and 4PCC (4.3%), the authors note.
“Our meta-analysis suggests specific reversal with andexanet is not superior to unspecific reversal with 4PCC, and that’s good news because many centers, in many countries, have no access to specific antidotes that are more costly,” Dr. Gómez-Outes said. “4PCC is an effective and relatively safe drug, so it’s still a good option for these patients.”
Labeling for andexanet includes a warning for thromboembolic events, but in the absence of direct comparisons, the findings should be interpreted with caution, he added. Further insights are expected from an ongoing randomized trial of andexanet and standard of care in 900 patients who present with acute ICH less than 15 hours after taking an oral factor Xa inhibitor. The preliminary completion date is set for 2023.
“The meta-analysis raises awareness about the rates of mortality and thromboembolism after reversal agent administration, although understanding the implications of these data is challenging,” Christopher Granger, MD, and Sean P. Pokomey, MD, MBA, Duke University Medical Center, Durham, N.C., say in an accompanying editorial.
The fact that failure to achieve hemostasis was associated with death is expected and might be related to the way hemostasis was defined, rather than the actual failure of the hemostatic treatments, they suggest. “The prothrombotic effects of each agent, including andexanet, need to be better understood, as clinicians work toward including reversal agents into algorithms for bleeding management.”
Effective hemostasis was defined in the studies through various methods as: “Excellent/good” using the Sarode and ANNEXA-4 scales; “yes” in the International Society on Thrombosis and Hemostasis Scale; and with other scales and through clinical judgment.
Although the size of the meta-analysis dwarfs previous reviews, the editorialists and authors point out that 47 of the 60 studies were retrospective, only two had control groups, and 45 had a high risk for bias.
In general, there was also poor reporting of key clinical data, such as postbleeding anticoagulation management, and a limitation of the mortality analysis is that it was based in selected patients with effective hemostasis assessed within 48 hours, which may not capture early deaths, the authors note.
“The morbidity and mortality from ischemic strokes as a result of undertreatment of stroke prevention in patients with AFib continue to dwarf the bleeding related mortality among patients with AFib and on DOACs, and thus the number one priority is to treat nearly all patients with AFib with a DOAC,” Dr. Granger and Dr. Pokomey conclude. “The availability of reversal agents for DOACs should provide reassurance, with another tool in our armamentarium, to providers to prescribe OACs for stroke prevention.”
No funding/grant support was received to conduct the study. Coauthor Ramón Lecumberri has received personal fees from Boehringer Ingelheim and Bristol Myers Squibb outside the submitted work. All other authors report no relevant financial relationships. Dr. Granger has received research and consulting fees from Bristol Myers Squibb, Pfizer, Boehringer Ingelheim, Bayer, Janssen, Boston Scientific, Apple, AstraZeneca, Novartis, AbbVie, Biomed, CeleCor, GSK, Novartis, Medtronic, Merck, Novo Nordisk, Philips, Rho, and the U.S. Food and Drug Administration. Dr. Pokomey has received modest consulting support from Bristol Myers Squibb, Pfizer, Boston Scientific, Medtronic, Janssen, and Zoll; modest research support from Gilead, Boston Scientific, Bristol Myers Squibb, Pfizer, and Janssen; and significant research support from the FDA.
A version of this article first appeared on Medscape.com.
Are left atrial thrombi that defy preprocedure anticoagulation predictable?
Three or more weeks of oral anticoagulation (OAC) sometimes isn’t up to the job of clearing any potentially embolic left atrial (LA) thrombi before procedures like cardioversion or catheter ablation in patients with atrial fibrillation (AF). Such OAC-defiant LA thrombi aren’t common, nor are they rare enough to ignore, suggests a new meta-analysis that might also have identified features that predispose to them.
Such predictors of LA clots that persist despite OAC could potentially guide selective use of transesophageal echocardiography (TEE) instead of more routine policies to either use or not use TEE for thrombus rule-out before rhythm-control procedures, researchers propose.
Their prevalence was about 2.7% among the study’s more than 14,000 patients who received at least 3 weeks of OAC with either vitamin K antagonists (VKA) or direct oral anticoagulants (DOAC) before undergoing TEE.
But OAC-resistant LA thrombi were two- to four-times as common in patients with than without certain features, including AF other than paroxysmal and higher CHADS2 and CHA2DS2-VASc stroke risk-stratification scores.
“TEE imaging in select patients at an elevated risk of LA thrombus, despite anticoagulation status, may be a reasonable approach to minimize the risk of thromboembolic complications following cardioversion or catheter ablation,” propose the study’s authors, led by Antony Lurie, BMSC, Population Health Research Institute, Hamilton, Ont. Their report was published in the June 15 issue of the Journal of the American College of Cardiology.
Guidelines don’t encourage TEE before cardioversion in patients who have been on OAC for at least 3 weeks, the group notes, and policies on TEE use before AF ablation vary widely regardless of anticoagulation status.
The current study suggests that 3 weeks of OAC isn’t enough for a substantial number of patients, who might be put at thromboembolic risk if TEE were to be skipped before rhythm-control procedures.
Conversely, many patients unlikely to have LA thrombi get preprocedure TEE anyway. That can happen “irrespective of how long they’ve been anticoagulated, their pattern of atrial fibrillation, or their stroke risk,” senior author Jorge A. Wong, MD, MPH, Population Health Research Institute and McMaster University, Hamilton, Ont., told this news organization.
But “TEE is an invasive imaging modality, so it is associated with small element of risk.” The current study, Dr. Wong said, points to potential risk-stratification tools clinicians might use to guide more selective TEE screening.
“At sites where TEEs are done all the time for patients undergoing ablation, one could use several of these risk markers to perhaps tailor use of TEE in individuals,” Dr. Wong said. “For example, in people with paroxysmal atrial fibrillation, we found that the risk of left atrial appendage clot was approximately 1% or less.” Screening by TEE might reasonably be avoided in such patients.
“Fortunately, continued oral anticoagulation already yields low peri-procedural stroke rates,” observes an accompanying editorial from Paulus Kirchhof, MD, and Christoph Sinning, MD, from the University Heart & Vascular Center and German Centre of Cardiovascular Research, Hamburg.
“Based on this new analysis of existing data, a risk-based use of TEE imaging in anticoagulated patients could enable further improvement in the safe delivery of rhythm control interventions in patients with AF,” the editorialists agree.
The meta-analysis covered 10 prospective and 25 retrospective studies with a total of 14,653 patients that reported whether LA thrombus was present in patients with AF or atrial flutter (AFL) who underwent TEE after at least 3 weeks of VKA or DOAC therapy. Reports for 30 of the studies identified patients by rhythm-control procedure, and the remaining five didn’t specify TEE indications.
The weighted mean prevalence of LA thrombus at TEE was 2.73% (95% confidence interval, 1.95%-3.80%). The finding was not significantly changed in separate sensitivity analyses, the report says, including one limited to studies with low risk of bias and others excluding patients with valvular AF, interrupted OAC, heparin bridging, or subtherapeutic anticoagulation, respectively.
Patients treated with VKA and DOACs showed similar prevalences of LA thrombi, with means of 2.80% and 3.12%, respectively (P = .674). The prevalence was significantly higher in patients:
- with nonparoxysmal than with paroxysmal AF/AFL (4.81% vs. 1.03%; P < .001)
- undergoing cardioversion than ablation (5.55% vs. 1.65; P < .001)
- with CHA2DS2-VASc scores of at least 3 than with scores of 2 or less (6.31% vs. 1.06%; P < .001).
A limitation of the study, observe Dr. Kirchhof and Dr. Sinning, “is that all patients had a clinical indication for a TEE, which might be a selection bias. When a thrombus was found on TEE, clinical judgment led to postponing of the procedure,” thereby avoiding potential thromboembolism.
“Thus, the paper cannot demonstrate that presence of a thrombus on TEE is related to peri-procedural ischemic stroke,” they write.
The literature puts the risk for stroke or systemic embolism at well under 1% for patients anticoagulated with either VKA or DOACs for at least 3 weeks prior to cardioversion, in contrast to the nearly 3% prevalence of LA appendage thrombus by TEE in the current analysis, Dr. Wong observed.
“So we’re seeing a lot more left atrial appendage thrombus than we would see stroke,” but there wasn’t a way to determine whether that increases the stroke risk, he agreed.Dr. Wong, Dr. Lurie, and the other authors report no relevant conflicts. Dr. Kirchhof discloses receiving partial support “from several drug and device companies active in atrial fibrillation” and to being listed as inventor on two AF-related patents held by the University of Birmingham. Dr. Sinning reports no relevant relationships.
A version of this article first appeared on Medscape.com.
Three or more weeks of oral anticoagulation (OAC) sometimes isn’t up to the job of clearing any potentially embolic left atrial (LA) thrombi before procedures like cardioversion or catheter ablation in patients with atrial fibrillation (AF). Such OAC-defiant LA thrombi aren’t common, nor are they rare enough to ignore, suggests a new meta-analysis that might also have identified features that predispose to them.
Such predictors of LA clots that persist despite OAC could potentially guide selective use of transesophageal echocardiography (TEE) instead of more routine policies to either use or not use TEE for thrombus rule-out before rhythm-control procedures, researchers propose.
Their prevalence was about 2.7% among the study’s more than 14,000 patients who received at least 3 weeks of OAC with either vitamin K antagonists (VKA) or direct oral anticoagulants (DOAC) before undergoing TEE.
But OAC-resistant LA thrombi were two- to four-times as common in patients with than without certain features, including AF other than paroxysmal and higher CHADS2 and CHA2DS2-VASc stroke risk-stratification scores.
“TEE imaging in select patients at an elevated risk of LA thrombus, despite anticoagulation status, may be a reasonable approach to minimize the risk of thromboembolic complications following cardioversion or catheter ablation,” propose the study’s authors, led by Antony Lurie, BMSC, Population Health Research Institute, Hamilton, Ont. Their report was published in the June 15 issue of the Journal of the American College of Cardiology.
Guidelines don’t encourage TEE before cardioversion in patients who have been on OAC for at least 3 weeks, the group notes, and policies on TEE use before AF ablation vary widely regardless of anticoagulation status.
The current study suggests that 3 weeks of OAC isn’t enough for a substantial number of patients, who might be put at thromboembolic risk if TEE were to be skipped before rhythm-control procedures.
Conversely, many patients unlikely to have LA thrombi get preprocedure TEE anyway. That can happen “irrespective of how long they’ve been anticoagulated, their pattern of atrial fibrillation, or their stroke risk,” senior author Jorge A. Wong, MD, MPH, Population Health Research Institute and McMaster University, Hamilton, Ont., told this news organization.
But “TEE is an invasive imaging modality, so it is associated with small element of risk.” The current study, Dr. Wong said, points to potential risk-stratification tools clinicians might use to guide more selective TEE screening.
“At sites where TEEs are done all the time for patients undergoing ablation, one could use several of these risk markers to perhaps tailor use of TEE in individuals,” Dr. Wong said. “For example, in people with paroxysmal atrial fibrillation, we found that the risk of left atrial appendage clot was approximately 1% or less.” Screening by TEE might reasonably be avoided in such patients.
“Fortunately, continued oral anticoagulation already yields low peri-procedural stroke rates,” observes an accompanying editorial from Paulus Kirchhof, MD, and Christoph Sinning, MD, from the University Heart & Vascular Center and German Centre of Cardiovascular Research, Hamburg.
“Based on this new analysis of existing data, a risk-based use of TEE imaging in anticoagulated patients could enable further improvement in the safe delivery of rhythm control interventions in patients with AF,” the editorialists agree.
The meta-analysis covered 10 prospective and 25 retrospective studies with a total of 14,653 patients that reported whether LA thrombus was present in patients with AF or atrial flutter (AFL) who underwent TEE after at least 3 weeks of VKA or DOAC therapy. Reports for 30 of the studies identified patients by rhythm-control procedure, and the remaining five didn’t specify TEE indications.
The weighted mean prevalence of LA thrombus at TEE was 2.73% (95% confidence interval, 1.95%-3.80%). The finding was not significantly changed in separate sensitivity analyses, the report says, including one limited to studies with low risk of bias and others excluding patients with valvular AF, interrupted OAC, heparin bridging, or subtherapeutic anticoagulation, respectively.
Patients treated with VKA and DOACs showed similar prevalences of LA thrombi, with means of 2.80% and 3.12%, respectively (P = .674). The prevalence was significantly higher in patients:
- with nonparoxysmal than with paroxysmal AF/AFL (4.81% vs. 1.03%; P < .001)
- undergoing cardioversion than ablation (5.55% vs. 1.65; P < .001)
- with CHA2DS2-VASc scores of at least 3 than with scores of 2 or less (6.31% vs. 1.06%; P < .001).
A limitation of the study, observe Dr. Kirchhof and Dr. Sinning, “is that all patients had a clinical indication for a TEE, which might be a selection bias. When a thrombus was found on TEE, clinical judgment led to postponing of the procedure,” thereby avoiding potential thromboembolism.
“Thus, the paper cannot demonstrate that presence of a thrombus on TEE is related to peri-procedural ischemic stroke,” they write.
The literature puts the risk for stroke or systemic embolism at well under 1% for patients anticoagulated with either VKA or DOACs for at least 3 weeks prior to cardioversion, in contrast to the nearly 3% prevalence of LA appendage thrombus by TEE in the current analysis, Dr. Wong observed.
“So we’re seeing a lot more left atrial appendage thrombus than we would see stroke,” but there wasn’t a way to determine whether that increases the stroke risk, he agreed.Dr. Wong, Dr. Lurie, and the other authors report no relevant conflicts. Dr. Kirchhof discloses receiving partial support “from several drug and device companies active in atrial fibrillation” and to being listed as inventor on two AF-related patents held by the University of Birmingham. Dr. Sinning reports no relevant relationships.
A version of this article first appeared on Medscape.com.
Three or more weeks of oral anticoagulation (OAC) sometimes isn’t up to the job of clearing any potentially embolic left atrial (LA) thrombi before procedures like cardioversion or catheter ablation in patients with atrial fibrillation (AF). Such OAC-defiant LA thrombi aren’t common, nor are they rare enough to ignore, suggests a new meta-analysis that might also have identified features that predispose to them.
Such predictors of LA clots that persist despite OAC could potentially guide selective use of transesophageal echocardiography (TEE) instead of more routine policies to either use or not use TEE for thrombus rule-out before rhythm-control procedures, researchers propose.
Their prevalence was about 2.7% among the study’s more than 14,000 patients who received at least 3 weeks of OAC with either vitamin K antagonists (VKA) or direct oral anticoagulants (DOAC) before undergoing TEE.
But OAC-resistant LA thrombi were two- to four-times as common in patients with than without certain features, including AF other than paroxysmal and higher CHADS2 and CHA2DS2-VASc stroke risk-stratification scores.
“TEE imaging in select patients at an elevated risk of LA thrombus, despite anticoagulation status, may be a reasonable approach to minimize the risk of thromboembolic complications following cardioversion or catheter ablation,” propose the study’s authors, led by Antony Lurie, BMSC, Population Health Research Institute, Hamilton, Ont. Their report was published in the June 15 issue of the Journal of the American College of Cardiology.
Guidelines don’t encourage TEE before cardioversion in patients who have been on OAC for at least 3 weeks, the group notes, and policies on TEE use before AF ablation vary widely regardless of anticoagulation status.
The current study suggests that 3 weeks of OAC isn’t enough for a substantial number of patients, who might be put at thromboembolic risk if TEE were to be skipped before rhythm-control procedures.
Conversely, many patients unlikely to have LA thrombi get preprocedure TEE anyway. That can happen “irrespective of how long they’ve been anticoagulated, their pattern of atrial fibrillation, or their stroke risk,” senior author Jorge A. Wong, MD, MPH, Population Health Research Institute and McMaster University, Hamilton, Ont., told this news organization.
But “TEE is an invasive imaging modality, so it is associated with small element of risk.” The current study, Dr. Wong said, points to potential risk-stratification tools clinicians might use to guide more selective TEE screening.
“At sites where TEEs are done all the time for patients undergoing ablation, one could use several of these risk markers to perhaps tailor use of TEE in individuals,” Dr. Wong said. “For example, in people with paroxysmal atrial fibrillation, we found that the risk of left atrial appendage clot was approximately 1% or less.” Screening by TEE might reasonably be avoided in such patients.
“Fortunately, continued oral anticoagulation already yields low peri-procedural stroke rates,” observes an accompanying editorial from Paulus Kirchhof, MD, and Christoph Sinning, MD, from the University Heart & Vascular Center and German Centre of Cardiovascular Research, Hamburg.
“Based on this new analysis of existing data, a risk-based use of TEE imaging in anticoagulated patients could enable further improvement in the safe delivery of rhythm control interventions in patients with AF,” the editorialists agree.
The meta-analysis covered 10 prospective and 25 retrospective studies with a total of 14,653 patients that reported whether LA thrombus was present in patients with AF or atrial flutter (AFL) who underwent TEE after at least 3 weeks of VKA or DOAC therapy. Reports for 30 of the studies identified patients by rhythm-control procedure, and the remaining five didn’t specify TEE indications.
The weighted mean prevalence of LA thrombus at TEE was 2.73% (95% confidence interval, 1.95%-3.80%). The finding was not significantly changed in separate sensitivity analyses, the report says, including one limited to studies with low risk of bias and others excluding patients with valvular AF, interrupted OAC, heparin bridging, or subtherapeutic anticoagulation, respectively.
Patients treated with VKA and DOACs showed similar prevalences of LA thrombi, with means of 2.80% and 3.12%, respectively (P = .674). The prevalence was significantly higher in patients:
- with nonparoxysmal than with paroxysmal AF/AFL (4.81% vs. 1.03%; P < .001)
- undergoing cardioversion than ablation (5.55% vs. 1.65; P < .001)
- with CHA2DS2-VASc scores of at least 3 than with scores of 2 or less (6.31% vs. 1.06%; P < .001).
A limitation of the study, observe Dr. Kirchhof and Dr. Sinning, “is that all patients had a clinical indication for a TEE, which might be a selection bias. When a thrombus was found on TEE, clinical judgment led to postponing of the procedure,” thereby avoiding potential thromboembolism.
“Thus, the paper cannot demonstrate that presence of a thrombus on TEE is related to peri-procedural ischemic stroke,” they write.
The literature puts the risk for stroke or systemic embolism at well under 1% for patients anticoagulated with either VKA or DOACs for at least 3 weeks prior to cardioversion, in contrast to the nearly 3% prevalence of LA appendage thrombus by TEE in the current analysis, Dr. Wong observed.
“So we’re seeing a lot more left atrial appendage thrombus than we would see stroke,” but there wasn’t a way to determine whether that increases the stroke risk, he agreed.Dr. Wong, Dr. Lurie, and the other authors report no relevant conflicts. Dr. Kirchhof discloses receiving partial support “from several drug and device companies active in atrial fibrillation” and to being listed as inventor on two AF-related patents held by the University of Birmingham. Dr. Sinning reports no relevant relationships.
A version of this article first appeared on Medscape.com.
Evidence builds for iPhone 12 interference with cardiac devices
Further evidence that powerful magnets in some Apple iPhones can interfere with cardiac implantable electronic devices (CIEDs) comes from a small study that also suggests some devices are more susceptible than others.
The iPhone 12 Pro Max with MagSafe technology interfered with CIEDs implanted in three consecutive patients presenting to an electrophysiology lab and in 8 of 11 implantable cardioverter defibrillators (ICDs) and pacemakers (72.7%) still in their original packaging.
The results, published in the Journal of the American Heart Association, are consistent with a widely publicized single-patient report this February and evidence of electromagnetic interference with fitness wristbands and e-cigarettes.
The MagSafe technology supports wireless charging and is optimized by a ring-shaped array of magnets. Although magnet mode activation has been shown to occur in CIEDs with exposure to a magnetic field as low as 10 gauss, the field strength of the iPhone 12 Pro Max can be greater than 50 G when in direct contact, the researchers determined.
“If this becomes a standard in a lot of the new smartphones or companies start to use stronger magnets ... then we will see more and more of these consumer electronic and device interactions,” senior author Michael Wu, MD, Brown University, Providence, R.I., told this news organization.
In a May advisory on these device interactions, the U.S. Food and Drug Administration also cautioned that the number of consumer electronics with strong magnets is expected to increase over time.
That trend appears to be already underway, with Forbes reporting in February that the MagSafe batteries will be “getting stronger” as part of upgrades to the iPhone 13 and Bloomberg reporting in advance of Apple’s annual developers conference this week that an upgraded version of MagSafe is in the works to support wireless charging for its iPad. MagSafe has not been used previously in iPads.
Although Apple has acknowledged that the iPhone 12 contains more magnets than previous iPhone models, it says “they’re not expected to pose a greater risk of magnetic interference to medical devices than prior iPhone models.” The company maintains a page that specifically warns about the potential for interactions and advises that consumers keep the iPhone and MagSafe accessories more than 15 cm (6 inches) away from medical devices.
Older-generation iPhones have not shown this risk, with only one case of interference reported with the iPhone 6 and an Apple Watch in 1,352 tests among 148 patients with CIEDs and leads from four different manufacturers.
In the present study, magnet reversion mode was triggered in all three patients when the iPhone 12 Pro Max was placed on the skin over the device.
The phone inhibited tachycardia therapies in Medtronic’s Amplia MRI Quad CRT-D and Abbott’s 1231-40 Fortify VR device.
The Boston Scientific V273 Intua CRT-P device, however, “appeared to be less susceptible, as we were only able to elicit transient temporary asynchronous pacing but no sustained response by the iPhone 12 Pro Max magnet,” Dr. Wu and colleagues note.
Among the 11 ex vivo CIEDs tested, placing the iPhone 12 Pro Max directly over the packaged device inhibited tachytherapies in Medtronic’s Visia AF MRI ICD and Abbott’s Fortify Assura DR ICD and Ellipse DR ICD.
The phone also led to asynchronous pacing in Medtronic’s Azure, Advisa MRI, and Adapta pacemakers and in Abbott’s Assurity MRI pacemaker.
Boston Scientific devices again “appeared to be less susceptible, as no clear magnet interference” was noted in the Dynagen ICD, Emblem MRI S-ICD, or Accolade MRI pacemaker, Dr. Wu reported. There was temporary asynchronous pacing but no sustained response in the company’s U125 Valitude pacemaker.
Using the Medtronic Visia AF MRI ICD, the researchers found that the iPhone 12 Pro Max was able to trigger magnet reversion mode at a distance up to 1.5 cm (0.6 inch) from the anterior aspect of the device ex vivo.
The difference in magnet response to the iPhone 12 Pro Max among the different devices is likely due to different hall-sensor magnet sensitivity, as all of the devices were susceptible to a standard donut magnet, Dr. Wu noted. Boston Scientific’s Accolade MRI pacemaker, for example, requires a magnet stronger than 70 G to activate magnet mode, according to the product manual.
“Even so, sometimes with our test, we were able to trigger a brief response,” he said. “The response isn’t as lasting as some of the other companies, but with the small sample size, I can only speculate and suggest that maybe it’s possible. But we always want a formal study through the company or other agencies to really pinpoint which company has more susceptible devices.”
As to whether manufacturers should build CIEDs less susceptible to today’s stronger magnets, Dr. Wu said it’s worth exploring, but there are pros and cons.
Although magnets in consumer devices have the potential to inhibit lifesaving therapies, a magnet is also very useful in certain medical settings, such as a quick way to ensure pacing without worrying about electrocautery noise during surgery or to deactivate a defibrillator if there’s noise resulting in inappropriate shocks.
“It would require an overhaul of a lot of the devices going forward, and I think that’s something that’s worth exploring, especially now that a lot of devices are using wireless communication, Bluetooth, and other communication technology,” he said.
Even though the study is small, Dr. Wu said, it does represent many of the available devices and has clinical implications, given that people often put their smartphones in a breast pocket.
“This report highlights the importance of public awareness regarding an interaction between CIEDs and a recently released smartphone model with magnetic charging capability,” Dr. Wu and colleagues conclude.
Apple was contacted for comment but had not responded at press time.
The authors reported no study funding or relevant conflicts of interests.
A version of this article first appeared on Medscape.com.
Further evidence that powerful magnets in some Apple iPhones can interfere with cardiac implantable electronic devices (CIEDs) comes from a small study that also suggests some devices are more susceptible than others.
The iPhone 12 Pro Max with MagSafe technology interfered with CIEDs implanted in three consecutive patients presenting to an electrophysiology lab and in 8 of 11 implantable cardioverter defibrillators (ICDs) and pacemakers (72.7%) still in their original packaging.
The results, published in the Journal of the American Heart Association, are consistent with a widely publicized single-patient report this February and evidence of electromagnetic interference with fitness wristbands and e-cigarettes.
The MagSafe technology supports wireless charging and is optimized by a ring-shaped array of magnets. Although magnet mode activation has been shown to occur in CIEDs with exposure to a magnetic field as low as 10 gauss, the field strength of the iPhone 12 Pro Max can be greater than 50 G when in direct contact, the researchers determined.
“If this becomes a standard in a lot of the new smartphones or companies start to use stronger magnets ... then we will see more and more of these consumer electronic and device interactions,” senior author Michael Wu, MD, Brown University, Providence, R.I., told this news organization.
In a May advisory on these device interactions, the U.S. Food and Drug Administration also cautioned that the number of consumer electronics with strong magnets is expected to increase over time.
That trend appears to be already underway, with Forbes reporting in February that the MagSafe batteries will be “getting stronger” as part of upgrades to the iPhone 13 and Bloomberg reporting in advance of Apple’s annual developers conference this week that an upgraded version of MagSafe is in the works to support wireless charging for its iPad. MagSafe has not been used previously in iPads.
Although Apple has acknowledged that the iPhone 12 contains more magnets than previous iPhone models, it says “they’re not expected to pose a greater risk of magnetic interference to medical devices than prior iPhone models.” The company maintains a page that specifically warns about the potential for interactions and advises that consumers keep the iPhone and MagSafe accessories more than 15 cm (6 inches) away from medical devices.
Older-generation iPhones have not shown this risk, with only one case of interference reported with the iPhone 6 and an Apple Watch in 1,352 tests among 148 patients with CIEDs and leads from four different manufacturers.
In the present study, magnet reversion mode was triggered in all three patients when the iPhone 12 Pro Max was placed on the skin over the device.
The phone inhibited tachycardia therapies in Medtronic’s Amplia MRI Quad CRT-D and Abbott’s 1231-40 Fortify VR device.
The Boston Scientific V273 Intua CRT-P device, however, “appeared to be less susceptible, as we were only able to elicit transient temporary asynchronous pacing but no sustained response by the iPhone 12 Pro Max magnet,” Dr. Wu and colleagues note.
Among the 11 ex vivo CIEDs tested, placing the iPhone 12 Pro Max directly over the packaged device inhibited tachytherapies in Medtronic’s Visia AF MRI ICD and Abbott’s Fortify Assura DR ICD and Ellipse DR ICD.
The phone also led to asynchronous pacing in Medtronic’s Azure, Advisa MRI, and Adapta pacemakers and in Abbott’s Assurity MRI pacemaker.
Boston Scientific devices again “appeared to be less susceptible, as no clear magnet interference” was noted in the Dynagen ICD, Emblem MRI S-ICD, or Accolade MRI pacemaker, Dr. Wu reported. There was temporary asynchronous pacing but no sustained response in the company’s U125 Valitude pacemaker.
Using the Medtronic Visia AF MRI ICD, the researchers found that the iPhone 12 Pro Max was able to trigger magnet reversion mode at a distance up to 1.5 cm (0.6 inch) from the anterior aspect of the device ex vivo.
The difference in magnet response to the iPhone 12 Pro Max among the different devices is likely due to different hall-sensor magnet sensitivity, as all of the devices were susceptible to a standard donut magnet, Dr. Wu noted. Boston Scientific’s Accolade MRI pacemaker, for example, requires a magnet stronger than 70 G to activate magnet mode, according to the product manual.
“Even so, sometimes with our test, we were able to trigger a brief response,” he said. “The response isn’t as lasting as some of the other companies, but with the small sample size, I can only speculate and suggest that maybe it’s possible. But we always want a formal study through the company or other agencies to really pinpoint which company has more susceptible devices.”
As to whether manufacturers should build CIEDs less susceptible to today’s stronger magnets, Dr. Wu said it’s worth exploring, but there are pros and cons.
Although magnets in consumer devices have the potential to inhibit lifesaving therapies, a magnet is also very useful in certain medical settings, such as a quick way to ensure pacing without worrying about electrocautery noise during surgery or to deactivate a defibrillator if there’s noise resulting in inappropriate shocks.
“It would require an overhaul of a lot of the devices going forward, and I think that’s something that’s worth exploring, especially now that a lot of devices are using wireless communication, Bluetooth, and other communication technology,” he said.
Even though the study is small, Dr. Wu said, it does represent many of the available devices and has clinical implications, given that people often put their smartphones in a breast pocket.
“This report highlights the importance of public awareness regarding an interaction between CIEDs and a recently released smartphone model with magnetic charging capability,” Dr. Wu and colleagues conclude.
Apple was contacted for comment but had not responded at press time.
The authors reported no study funding or relevant conflicts of interests.
A version of this article first appeared on Medscape.com.
Further evidence that powerful magnets in some Apple iPhones can interfere with cardiac implantable electronic devices (CIEDs) comes from a small study that also suggests some devices are more susceptible than others.
The iPhone 12 Pro Max with MagSafe technology interfered with CIEDs implanted in three consecutive patients presenting to an electrophysiology lab and in 8 of 11 implantable cardioverter defibrillators (ICDs) and pacemakers (72.7%) still in their original packaging.
The results, published in the Journal of the American Heart Association, are consistent with a widely publicized single-patient report this February and evidence of electromagnetic interference with fitness wristbands and e-cigarettes.
The MagSafe technology supports wireless charging and is optimized by a ring-shaped array of magnets. Although magnet mode activation has been shown to occur in CIEDs with exposure to a magnetic field as low as 10 gauss, the field strength of the iPhone 12 Pro Max can be greater than 50 G when in direct contact, the researchers determined.
“If this becomes a standard in a lot of the new smartphones or companies start to use stronger magnets ... then we will see more and more of these consumer electronic and device interactions,” senior author Michael Wu, MD, Brown University, Providence, R.I., told this news organization.
In a May advisory on these device interactions, the U.S. Food and Drug Administration also cautioned that the number of consumer electronics with strong magnets is expected to increase over time.
That trend appears to be already underway, with Forbes reporting in February that the MagSafe batteries will be “getting stronger” as part of upgrades to the iPhone 13 and Bloomberg reporting in advance of Apple’s annual developers conference this week that an upgraded version of MagSafe is in the works to support wireless charging for its iPad. MagSafe has not been used previously in iPads.
Although Apple has acknowledged that the iPhone 12 contains more magnets than previous iPhone models, it says “they’re not expected to pose a greater risk of magnetic interference to medical devices than prior iPhone models.” The company maintains a page that specifically warns about the potential for interactions and advises that consumers keep the iPhone and MagSafe accessories more than 15 cm (6 inches) away from medical devices.
Older-generation iPhones have not shown this risk, with only one case of interference reported with the iPhone 6 and an Apple Watch in 1,352 tests among 148 patients with CIEDs and leads from four different manufacturers.
In the present study, magnet reversion mode was triggered in all three patients when the iPhone 12 Pro Max was placed on the skin over the device.
The phone inhibited tachycardia therapies in Medtronic’s Amplia MRI Quad CRT-D and Abbott’s 1231-40 Fortify VR device.
The Boston Scientific V273 Intua CRT-P device, however, “appeared to be less susceptible, as we were only able to elicit transient temporary asynchronous pacing but no sustained response by the iPhone 12 Pro Max magnet,” Dr. Wu and colleagues note.
Among the 11 ex vivo CIEDs tested, placing the iPhone 12 Pro Max directly over the packaged device inhibited tachytherapies in Medtronic’s Visia AF MRI ICD and Abbott’s Fortify Assura DR ICD and Ellipse DR ICD.
The phone also led to asynchronous pacing in Medtronic’s Azure, Advisa MRI, and Adapta pacemakers and in Abbott’s Assurity MRI pacemaker.
Boston Scientific devices again “appeared to be less susceptible, as no clear magnet interference” was noted in the Dynagen ICD, Emblem MRI S-ICD, or Accolade MRI pacemaker, Dr. Wu reported. There was temporary asynchronous pacing but no sustained response in the company’s U125 Valitude pacemaker.
Using the Medtronic Visia AF MRI ICD, the researchers found that the iPhone 12 Pro Max was able to trigger magnet reversion mode at a distance up to 1.5 cm (0.6 inch) from the anterior aspect of the device ex vivo.
The difference in magnet response to the iPhone 12 Pro Max among the different devices is likely due to different hall-sensor magnet sensitivity, as all of the devices were susceptible to a standard donut magnet, Dr. Wu noted. Boston Scientific’s Accolade MRI pacemaker, for example, requires a magnet stronger than 70 G to activate magnet mode, according to the product manual.
“Even so, sometimes with our test, we were able to trigger a brief response,” he said. “The response isn’t as lasting as some of the other companies, but with the small sample size, I can only speculate and suggest that maybe it’s possible. But we always want a formal study through the company or other agencies to really pinpoint which company has more susceptible devices.”
As to whether manufacturers should build CIEDs less susceptible to today’s stronger magnets, Dr. Wu said it’s worth exploring, but there are pros and cons.
Although magnets in consumer devices have the potential to inhibit lifesaving therapies, a magnet is also very useful in certain medical settings, such as a quick way to ensure pacing without worrying about electrocautery noise during surgery or to deactivate a defibrillator if there’s noise resulting in inappropriate shocks.
“It would require an overhaul of a lot of the devices going forward, and I think that’s something that’s worth exploring, especially now that a lot of devices are using wireless communication, Bluetooth, and other communication technology,” he said.
Even though the study is small, Dr. Wu said, it does represent many of the available devices and has clinical implications, given that people often put their smartphones in a breast pocket.
“This report highlights the importance of public awareness regarding an interaction between CIEDs and a recently released smartphone model with magnetic charging capability,” Dr. Wu and colleagues conclude.
Apple was contacted for comment but had not responded at press time.
The authors reported no study funding or relevant conflicts of interests.
A version of this article first appeared on Medscape.com.