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‘Simple’ way to cut PAD risk, misguided ED visits for atrial fib, and more
This week in MDedge Cardiocast: Elevated CAC in highly active men doesn’t raise risk of death, Life’s Simple 7 scores can be used to modify PAD risk, medical guidance often leads atrial fibrillation patients to needlessly seek emergency department care, and thinking of pregnancy as a stress test can help predict women’s future cardiovascular risk.
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This week in MDedge Cardiocast: Elevated CAC in highly active men doesn’t raise risk of death, Life’s Simple 7 scores can be used to modify PAD risk, medical guidance often leads atrial fibrillation patients to needlessly seek emergency department care, and thinking of pregnancy as a stress test can help predict women’s future cardiovascular risk.
Amazon AlexaApple Podcasts
Google Podcasts
TuneIn
This week in MDedge Cardiocast: Elevated CAC in highly active men doesn’t raise risk of death, Life’s Simple 7 scores can be used to modify PAD risk, medical guidance often leads atrial fibrillation patients to needlessly seek emergency department care, and thinking of pregnancy as a stress test can help predict women’s future cardiovascular risk.
Amazon AlexaApple Podcasts
Google Podcasts
TuneIn
New cryoablating catheter shows promising AF efficacy, safety
BOSTON – An ultra-low-temperature ablation catheter was safe and effective in the first 48 atrial fibrillation (AF) patients to undergo treatment with the device.
The ultra-low-temperature catheter, cooled by liquid nitrogen to –196° C, showed excellent safety and a high success rate, in the modest number of patients who have been followed for 6 or 12 months, Tom De Potter, MD, said at the annual International AF Symposium. The catheter is capable of delivering both focal and linear lesions, said Dr. De Potter, a cardiac electrophysiologist at the Cardiovascular Center of OLV Hospital in Aalst, Belgium.
He reported results on the first 48 AF patients treated with the catheter at either his center or at St. Antonius Hospital in Nieuwegein, the Netherlands, in the CryoCure2 (Investigation of the Adagio Cryoablation System in Patients With Atrial Fibrillation) study. The investigators included safety findings only from the first 13 patients treated, but they assessed both safety and efficacy for the following 35 patients.
The safety review showed one patient with a groin-puncture injury, and two patients with phrenic nerve palsy, but no cases of phrenic nerve palsy in the most recent 41 patients who were treated with an updated version of the catheter that included a cryomapping feature. None of the 48 patients had a stroke, transient ischemic attack, esophageal injury, tamponade, or MI.
The 35 patients reviewed for efficacy included 10 patients with paroxysmal AF and 25 with persistent AF. All five of the paroxysmal AF patients followed for at least 6 months, and all four of those patients followed for 12 months, showed no AF recurrences. One of the persistent AF patients never achieved cardioversion at the time of the ablation procedure. All 17 other persistent AF patients followed for at least 6 months remained in sinus rhythm at 6 months. Among the eight of these patients followed for at least 12 months after treatment, one patient had AF recurrence, so the current 12-month rate of freedom from recurrence is seven of nine patients (including the one who never achieved cardioversion), or 78%.
The average procedure time to perform pulmonary vein isolation (PVI) only was 106 minutes, and procedure time was 116 minutes in the patients who underwent PVI plus additional ablation procedures. Average ablation time was 12 minutes among those just having PVI, and 14 minutes in those who underwent PVI plus other ablations. The cryoablation catheter comes with 20 electrodes that allow it to also record electrograms.
The attraction of the ultra-low-temperature cryoablation catheter used in the study is it “can achieve complete PVI considerably faster” than other ablation methods while also achieving “unsurpassed efficacy,” Dr. De Potter said in a written statement. In addition, “the new, adjustable diagnostic capacity simplifies the procedure and makes it much less operator dependent,” he added.
BOSTON – An ultra-low-temperature ablation catheter was safe and effective in the first 48 atrial fibrillation (AF) patients to undergo treatment with the device.
The ultra-low-temperature catheter, cooled by liquid nitrogen to –196° C, showed excellent safety and a high success rate, in the modest number of patients who have been followed for 6 or 12 months, Tom De Potter, MD, said at the annual International AF Symposium. The catheter is capable of delivering both focal and linear lesions, said Dr. De Potter, a cardiac electrophysiologist at the Cardiovascular Center of OLV Hospital in Aalst, Belgium.
He reported results on the first 48 AF patients treated with the catheter at either his center or at St. Antonius Hospital in Nieuwegein, the Netherlands, in the CryoCure2 (Investigation of the Adagio Cryoablation System in Patients With Atrial Fibrillation) study. The investigators included safety findings only from the first 13 patients treated, but they assessed both safety and efficacy for the following 35 patients.
The safety review showed one patient with a groin-puncture injury, and two patients with phrenic nerve palsy, but no cases of phrenic nerve palsy in the most recent 41 patients who were treated with an updated version of the catheter that included a cryomapping feature. None of the 48 patients had a stroke, transient ischemic attack, esophageal injury, tamponade, or MI.
The 35 patients reviewed for efficacy included 10 patients with paroxysmal AF and 25 with persistent AF. All five of the paroxysmal AF patients followed for at least 6 months, and all four of those patients followed for 12 months, showed no AF recurrences. One of the persistent AF patients never achieved cardioversion at the time of the ablation procedure. All 17 other persistent AF patients followed for at least 6 months remained in sinus rhythm at 6 months. Among the eight of these patients followed for at least 12 months after treatment, one patient had AF recurrence, so the current 12-month rate of freedom from recurrence is seven of nine patients (including the one who never achieved cardioversion), or 78%.
The average procedure time to perform pulmonary vein isolation (PVI) only was 106 minutes, and procedure time was 116 minutes in the patients who underwent PVI plus additional ablation procedures. Average ablation time was 12 minutes among those just having PVI, and 14 minutes in those who underwent PVI plus other ablations. The cryoablation catheter comes with 20 electrodes that allow it to also record electrograms.
The attraction of the ultra-low-temperature cryoablation catheter used in the study is it “can achieve complete PVI considerably faster” than other ablation methods while also achieving “unsurpassed efficacy,” Dr. De Potter said in a written statement. In addition, “the new, adjustable diagnostic capacity simplifies the procedure and makes it much less operator dependent,” he added.
BOSTON – An ultra-low-temperature ablation catheter was safe and effective in the first 48 atrial fibrillation (AF) patients to undergo treatment with the device.
The ultra-low-temperature catheter, cooled by liquid nitrogen to –196° C, showed excellent safety and a high success rate, in the modest number of patients who have been followed for 6 or 12 months, Tom De Potter, MD, said at the annual International AF Symposium. The catheter is capable of delivering both focal and linear lesions, said Dr. De Potter, a cardiac electrophysiologist at the Cardiovascular Center of OLV Hospital in Aalst, Belgium.
He reported results on the first 48 AF patients treated with the catheter at either his center or at St. Antonius Hospital in Nieuwegein, the Netherlands, in the CryoCure2 (Investigation of the Adagio Cryoablation System in Patients With Atrial Fibrillation) study. The investigators included safety findings only from the first 13 patients treated, but they assessed both safety and efficacy for the following 35 patients.
The safety review showed one patient with a groin-puncture injury, and two patients with phrenic nerve palsy, but no cases of phrenic nerve palsy in the most recent 41 patients who were treated with an updated version of the catheter that included a cryomapping feature. None of the 48 patients had a stroke, transient ischemic attack, esophageal injury, tamponade, or MI.
The 35 patients reviewed for efficacy included 10 patients with paroxysmal AF and 25 with persistent AF. All five of the paroxysmal AF patients followed for at least 6 months, and all four of those patients followed for 12 months, showed no AF recurrences. One of the persistent AF patients never achieved cardioversion at the time of the ablation procedure. All 17 other persistent AF patients followed for at least 6 months remained in sinus rhythm at 6 months. Among the eight of these patients followed for at least 12 months after treatment, one patient had AF recurrence, so the current 12-month rate of freedom from recurrence is seven of nine patients (including the one who never achieved cardioversion), or 78%.
The average procedure time to perform pulmonary vein isolation (PVI) only was 106 minutes, and procedure time was 116 minutes in the patients who underwent PVI plus additional ablation procedures. Average ablation time was 12 minutes among those just having PVI, and 14 minutes in those who underwent PVI plus other ablations. The cryoablation catheter comes with 20 electrodes that allow it to also record electrograms.
The attraction of the ultra-low-temperature cryoablation catheter used in the study is it “can achieve complete PVI considerably faster” than other ablation methods while also achieving “unsurpassed efficacy,” Dr. De Potter said in a written statement. In addition, “the new, adjustable diagnostic capacity simplifies the procedure and makes it much less operator dependent,” he added.
REPORTING FROM THE AF SYMPOSIUM 2019
Key clinical point:
Major finding: A year after cryoablation, seven of nine treated patients with persistent atrial fibrillation remained recurrence free.
Study details: CryoCure2, a single arm, multicenter, European study with 48 patients.
Disclosures: The CryoCure2 study is sponsored by Adagio Medical, the company developing the cryoablation catheter. Dr. De Potter has received travel support from Adagio, and he has received research funding from Boston Scientific and Johnson & Johnson.
Immunotherapy’s cardiac effects require early monitoring, management
WASHINGTON – Unquestionably, immunotherapy is revolutionizing the care of patients with various solid tumors and hematologic malignancies.
But it’s equally true that there’s no such thing as either a free lunch or a cancer therapy free of side effects, whether it’s increased risk for heart failure associated with anthracycline-based chemotherapy, or inflammatory conditions, arrhythmias, and thromboembolic events associated with immune checkpoint inhibitors, said R. Frank Cornell, MD, of Vanderbilt University Medical Center in Nashville, Tenn.
“Early awareness and intervention is critical for improved outcomes, and a multidisciplinary approach between oncology, cardiology, the clinic nurse, and other health care providers is critical in managing these patients with these complicated therapies,” he said at the American College of Cardiology’s Advancing the Cardiovascular Care of the Oncology Patient meeting.
Checkpoint inhibitors and the heart
Toxicities associated with immune checkpoint inhibitors such as the programmed death 1/ligand 1 (PD-1/PD-L1) inhibitors nivolumab (Opdivo) and pembrolizumab (Keytruda) and the cytotoxic T-lymphocyte antigen 4 antibody ipilimumab (Yervoy) tend to mimic autoimmune conditions, Dr. Cornell said.
Cardiovascular events associated with these agents, while uncommon, include myocarditis, pericarditis, arrhythmias, impaired ventricular function with heart failure, vasculitis, and venous thromboembolism, he said, citing an American Society of Clinical Oncology (ASCO) clinical practice guideline (J Clin Oncol 2018;36[17]:1714-68).
Dr. Cornell described the case of a 63-year-old woman with disseminated metastatic melanoma who presented to the emergency department 10 days after starting on combination therapy with ipilimumab and nivolumab. She had developed shortness of breath, pleuritic chest pain, and a mild cough for 1 or 2 days.
Her cardiac laboratory markers had been normal at baseline, but were markedly elevated on presentation, and electrocardiograms showed complete heart block and subsequent ventricular tachycardia.
The patient was started on high-dose prednisone, but she died in hospital, and an autopsy showed that the cause of death was infiltration into the myocardium of CD3-positive and CD8-positive T lymphocytes.
“So how do we manage this? This is a good opportunity, I think, for further cardiology and oncology collaboration to develop more robust guidelines for what we can do to best prevent this,” Dr. Cornell said.
Patients started on the ipilimumab/nivolumab combination should be tested weekly for cardiac troponin, creatine kinase (CK) and CK-muscle/brain (CK-MB) weekly for the first 3-4 weeks of therapy. Therapy should be stopped if troponin levels continue to rise, and the patient should be started on high-dose steroids, he said.
The role of other anti-inflammatory agents such as infliximab (Remicade and biosimilars) is unclear and needs further study, he added.
Dr. Cornell cited a 2018 letter to The Lancet by Javid J. Moslehi, MD, and colleagues from Vanderbilt describing an increase in reports of fatal myocarditis among patients treated with checkpoint inhibitors.
“We highlight the high mortality rate with severe immune checkpoint inhibitor–related myocarditis, which is more frequent with combination PD-1 and CTLA-4 blockade, but can also occur with monotherapy. Myocarditis was observed across immune checkpoint inhibitor regimens, although it remains too early to determine whether the incidence differs between use of anti-PD1 and anti-PD-L1 drugs. Furthermore, this condition occurs early on during therapy and across cancer types,” they wrote.
Most of the patients had no preexisting cardiovascular disease, and most were not taking medications for hypertension, cardiovascular disease, or diabetes.
CAR-T cells and cardiac disease
The primary cardiac complications associated with CAR-T cell therapy are related to the cytokine release syndrome (CRS), a condition marked by progressive elevation in inflammatory cytokines that in turn leads to marked elevations in C-reactive protein (CRP), interferon gamma, tumor necrosis factor al, and release of pro-inflammatory cytokines including interleukin (IL) 6, IL-10, IL-12, and IL-1 beta.
In rare instances, CRS can lead to disseminated intravascular coagulation (DIC), capillary leak syndrome, and a hemophagocytic lymphohistiocytosis-like (HLH) syndrome, Dr. Cornell said.
Package inserts for the two Food and Drug Administration–approved CAR-T cell products, axicabtagene ciloleucel (Yescarta) and tisagenlecleucel (Kymriah) show that each was associated in clinical trials with a high incidence of CRS.
Among patients treated with axicabtagene ciloleucel, 94% developed CRS, which was grade 3 or greater in severity in 13%. The median time to onset was 2 days, and the median duration was 7 days. Cardiovascular adverse events included grade 3 or greater tachycardia in 2%, arrhythmias in 7%, edema in 1%, dyspnea in 3%, pleural effusion in 2%, hypotension in 15%, hypertension in 6%, and thrombosis in 1%.
Among patients treated with tisagenlecleucel, 79% treated for B-cell acute lymphoblastic leukemia (B-ALL) and 74% treated for diffuse large B cell lymphoma (DLBCL) developed CRS, which was grade 3 or greater in 49% and 23% of patients, respectively. The median time to onset was 3 days, and the median duration of CRS was 8 days.
Cardiovascular adverse events of grade 3 or greater among these patients included tachycardia in 4%, fluid overload in 7%, edema in 1%, dyspnea in 12%, pulmonary edema in 4%, hypotension in 22%, and hypertension in 6%.
Risk factors for CRS include high pre-infusion tumor burden, active infections, and concurrent inflammatory processes, Dr. Cornell said.
Prevention of cardiovascular complications of CAR-T cell therapy requires management of CRS. Patients with grade 2 or greater CRS should receive the anti-IL-6 agent tocilizumab (Actemra) 8 mg/kg intravenously over 1 hour to a maximum dose of 800 mg. Tocilizumab infusions can be repeated every 8 hours as needed if the patient is not responsive to intravenous fluids or increasing supplement oxygen, but should be limited to a maximum of three doses over 24 hours, and a maximum total of four doses.
Patients with grade 3 CRS should also receive intravenous methylprednisolone 1 mg/kg twice daily or the equivalent amount of dexamethasone, with corticosteroids continued until the severity of CRS is grade 1 or less, then tapered over 3 days,
Patients with grade 4 CRS should also receive IV methylprednisolone 1,000 mg per day for 3 days, and if symptoms improve, continue management as per grade 3, Dr. Cornell said.
Dr. Cornell reported having nothing to disclose.
WASHINGTON – Unquestionably, immunotherapy is revolutionizing the care of patients with various solid tumors and hematologic malignancies.
But it’s equally true that there’s no such thing as either a free lunch or a cancer therapy free of side effects, whether it’s increased risk for heart failure associated with anthracycline-based chemotherapy, or inflammatory conditions, arrhythmias, and thromboembolic events associated with immune checkpoint inhibitors, said R. Frank Cornell, MD, of Vanderbilt University Medical Center in Nashville, Tenn.
“Early awareness and intervention is critical for improved outcomes, and a multidisciplinary approach between oncology, cardiology, the clinic nurse, and other health care providers is critical in managing these patients with these complicated therapies,” he said at the American College of Cardiology’s Advancing the Cardiovascular Care of the Oncology Patient meeting.
Checkpoint inhibitors and the heart
Toxicities associated with immune checkpoint inhibitors such as the programmed death 1/ligand 1 (PD-1/PD-L1) inhibitors nivolumab (Opdivo) and pembrolizumab (Keytruda) and the cytotoxic T-lymphocyte antigen 4 antibody ipilimumab (Yervoy) tend to mimic autoimmune conditions, Dr. Cornell said.
Cardiovascular events associated with these agents, while uncommon, include myocarditis, pericarditis, arrhythmias, impaired ventricular function with heart failure, vasculitis, and venous thromboembolism, he said, citing an American Society of Clinical Oncology (ASCO) clinical practice guideline (J Clin Oncol 2018;36[17]:1714-68).
Dr. Cornell described the case of a 63-year-old woman with disseminated metastatic melanoma who presented to the emergency department 10 days after starting on combination therapy with ipilimumab and nivolumab. She had developed shortness of breath, pleuritic chest pain, and a mild cough for 1 or 2 days.
Her cardiac laboratory markers had been normal at baseline, but were markedly elevated on presentation, and electrocardiograms showed complete heart block and subsequent ventricular tachycardia.
The patient was started on high-dose prednisone, but she died in hospital, and an autopsy showed that the cause of death was infiltration into the myocardium of CD3-positive and CD8-positive T lymphocytes.
“So how do we manage this? This is a good opportunity, I think, for further cardiology and oncology collaboration to develop more robust guidelines for what we can do to best prevent this,” Dr. Cornell said.
Patients started on the ipilimumab/nivolumab combination should be tested weekly for cardiac troponin, creatine kinase (CK) and CK-muscle/brain (CK-MB) weekly for the first 3-4 weeks of therapy. Therapy should be stopped if troponin levels continue to rise, and the patient should be started on high-dose steroids, he said.
The role of other anti-inflammatory agents such as infliximab (Remicade and biosimilars) is unclear and needs further study, he added.
Dr. Cornell cited a 2018 letter to The Lancet by Javid J. Moslehi, MD, and colleagues from Vanderbilt describing an increase in reports of fatal myocarditis among patients treated with checkpoint inhibitors.
“We highlight the high mortality rate with severe immune checkpoint inhibitor–related myocarditis, which is more frequent with combination PD-1 and CTLA-4 blockade, but can also occur with monotherapy. Myocarditis was observed across immune checkpoint inhibitor regimens, although it remains too early to determine whether the incidence differs between use of anti-PD1 and anti-PD-L1 drugs. Furthermore, this condition occurs early on during therapy and across cancer types,” they wrote.
Most of the patients had no preexisting cardiovascular disease, and most were not taking medications for hypertension, cardiovascular disease, or diabetes.
CAR-T cells and cardiac disease
The primary cardiac complications associated with CAR-T cell therapy are related to the cytokine release syndrome (CRS), a condition marked by progressive elevation in inflammatory cytokines that in turn leads to marked elevations in C-reactive protein (CRP), interferon gamma, tumor necrosis factor al, and release of pro-inflammatory cytokines including interleukin (IL) 6, IL-10, IL-12, and IL-1 beta.
In rare instances, CRS can lead to disseminated intravascular coagulation (DIC), capillary leak syndrome, and a hemophagocytic lymphohistiocytosis-like (HLH) syndrome, Dr. Cornell said.
Package inserts for the two Food and Drug Administration–approved CAR-T cell products, axicabtagene ciloleucel (Yescarta) and tisagenlecleucel (Kymriah) show that each was associated in clinical trials with a high incidence of CRS.
Among patients treated with axicabtagene ciloleucel, 94% developed CRS, which was grade 3 or greater in severity in 13%. The median time to onset was 2 days, and the median duration was 7 days. Cardiovascular adverse events included grade 3 or greater tachycardia in 2%, arrhythmias in 7%, edema in 1%, dyspnea in 3%, pleural effusion in 2%, hypotension in 15%, hypertension in 6%, and thrombosis in 1%.
Among patients treated with tisagenlecleucel, 79% treated for B-cell acute lymphoblastic leukemia (B-ALL) and 74% treated for diffuse large B cell lymphoma (DLBCL) developed CRS, which was grade 3 or greater in 49% and 23% of patients, respectively. The median time to onset was 3 days, and the median duration of CRS was 8 days.
Cardiovascular adverse events of grade 3 or greater among these patients included tachycardia in 4%, fluid overload in 7%, edema in 1%, dyspnea in 12%, pulmonary edema in 4%, hypotension in 22%, and hypertension in 6%.
Risk factors for CRS include high pre-infusion tumor burden, active infections, and concurrent inflammatory processes, Dr. Cornell said.
Prevention of cardiovascular complications of CAR-T cell therapy requires management of CRS. Patients with grade 2 or greater CRS should receive the anti-IL-6 agent tocilizumab (Actemra) 8 mg/kg intravenously over 1 hour to a maximum dose of 800 mg. Tocilizumab infusions can be repeated every 8 hours as needed if the patient is not responsive to intravenous fluids or increasing supplement oxygen, but should be limited to a maximum of three doses over 24 hours, and a maximum total of four doses.
Patients with grade 3 CRS should also receive intravenous methylprednisolone 1 mg/kg twice daily or the equivalent amount of dexamethasone, with corticosteroids continued until the severity of CRS is grade 1 or less, then tapered over 3 days,
Patients with grade 4 CRS should also receive IV methylprednisolone 1,000 mg per day for 3 days, and if symptoms improve, continue management as per grade 3, Dr. Cornell said.
Dr. Cornell reported having nothing to disclose.
WASHINGTON – Unquestionably, immunotherapy is revolutionizing the care of patients with various solid tumors and hematologic malignancies.
But it’s equally true that there’s no such thing as either a free lunch or a cancer therapy free of side effects, whether it’s increased risk for heart failure associated with anthracycline-based chemotherapy, or inflammatory conditions, arrhythmias, and thromboembolic events associated with immune checkpoint inhibitors, said R. Frank Cornell, MD, of Vanderbilt University Medical Center in Nashville, Tenn.
“Early awareness and intervention is critical for improved outcomes, and a multidisciplinary approach between oncology, cardiology, the clinic nurse, and other health care providers is critical in managing these patients with these complicated therapies,” he said at the American College of Cardiology’s Advancing the Cardiovascular Care of the Oncology Patient meeting.
Checkpoint inhibitors and the heart
Toxicities associated with immune checkpoint inhibitors such as the programmed death 1/ligand 1 (PD-1/PD-L1) inhibitors nivolumab (Opdivo) and pembrolizumab (Keytruda) and the cytotoxic T-lymphocyte antigen 4 antibody ipilimumab (Yervoy) tend to mimic autoimmune conditions, Dr. Cornell said.
Cardiovascular events associated with these agents, while uncommon, include myocarditis, pericarditis, arrhythmias, impaired ventricular function with heart failure, vasculitis, and venous thromboembolism, he said, citing an American Society of Clinical Oncology (ASCO) clinical practice guideline (J Clin Oncol 2018;36[17]:1714-68).
Dr. Cornell described the case of a 63-year-old woman with disseminated metastatic melanoma who presented to the emergency department 10 days after starting on combination therapy with ipilimumab and nivolumab. She had developed shortness of breath, pleuritic chest pain, and a mild cough for 1 or 2 days.
Her cardiac laboratory markers had been normal at baseline, but were markedly elevated on presentation, and electrocardiograms showed complete heart block and subsequent ventricular tachycardia.
The patient was started on high-dose prednisone, but she died in hospital, and an autopsy showed that the cause of death was infiltration into the myocardium of CD3-positive and CD8-positive T lymphocytes.
“So how do we manage this? This is a good opportunity, I think, for further cardiology and oncology collaboration to develop more robust guidelines for what we can do to best prevent this,” Dr. Cornell said.
Patients started on the ipilimumab/nivolumab combination should be tested weekly for cardiac troponin, creatine kinase (CK) and CK-muscle/brain (CK-MB) weekly for the first 3-4 weeks of therapy. Therapy should be stopped if troponin levels continue to rise, and the patient should be started on high-dose steroids, he said.
The role of other anti-inflammatory agents such as infliximab (Remicade and biosimilars) is unclear and needs further study, he added.
Dr. Cornell cited a 2018 letter to The Lancet by Javid J. Moslehi, MD, and colleagues from Vanderbilt describing an increase in reports of fatal myocarditis among patients treated with checkpoint inhibitors.
“We highlight the high mortality rate with severe immune checkpoint inhibitor–related myocarditis, which is more frequent with combination PD-1 and CTLA-4 blockade, but can also occur with monotherapy. Myocarditis was observed across immune checkpoint inhibitor regimens, although it remains too early to determine whether the incidence differs between use of anti-PD1 and anti-PD-L1 drugs. Furthermore, this condition occurs early on during therapy and across cancer types,” they wrote.
Most of the patients had no preexisting cardiovascular disease, and most were not taking medications for hypertension, cardiovascular disease, or diabetes.
CAR-T cells and cardiac disease
The primary cardiac complications associated with CAR-T cell therapy are related to the cytokine release syndrome (CRS), a condition marked by progressive elevation in inflammatory cytokines that in turn leads to marked elevations in C-reactive protein (CRP), interferon gamma, tumor necrosis factor al, and release of pro-inflammatory cytokines including interleukin (IL) 6, IL-10, IL-12, and IL-1 beta.
In rare instances, CRS can lead to disseminated intravascular coagulation (DIC), capillary leak syndrome, and a hemophagocytic lymphohistiocytosis-like (HLH) syndrome, Dr. Cornell said.
Package inserts for the two Food and Drug Administration–approved CAR-T cell products, axicabtagene ciloleucel (Yescarta) and tisagenlecleucel (Kymriah) show that each was associated in clinical trials with a high incidence of CRS.
Among patients treated with axicabtagene ciloleucel, 94% developed CRS, which was grade 3 or greater in severity in 13%. The median time to onset was 2 days, and the median duration was 7 days. Cardiovascular adverse events included grade 3 or greater tachycardia in 2%, arrhythmias in 7%, edema in 1%, dyspnea in 3%, pleural effusion in 2%, hypotension in 15%, hypertension in 6%, and thrombosis in 1%.
Among patients treated with tisagenlecleucel, 79% treated for B-cell acute lymphoblastic leukemia (B-ALL) and 74% treated for diffuse large B cell lymphoma (DLBCL) developed CRS, which was grade 3 or greater in 49% and 23% of patients, respectively. The median time to onset was 3 days, and the median duration of CRS was 8 days.
Cardiovascular adverse events of grade 3 or greater among these patients included tachycardia in 4%, fluid overload in 7%, edema in 1%, dyspnea in 12%, pulmonary edema in 4%, hypotension in 22%, and hypertension in 6%.
Risk factors for CRS include high pre-infusion tumor burden, active infections, and concurrent inflammatory processes, Dr. Cornell said.
Prevention of cardiovascular complications of CAR-T cell therapy requires management of CRS. Patients with grade 2 or greater CRS should receive the anti-IL-6 agent tocilizumab (Actemra) 8 mg/kg intravenously over 1 hour to a maximum dose of 800 mg. Tocilizumab infusions can be repeated every 8 hours as needed if the patient is not responsive to intravenous fluids or increasing supplement oxygen, but should be limited to a maximum of three doses over 24 hours, and a maximum total of four doses.
Patients with grade 3 CRS should also receive intravenous methylprednisolone 1 mg/kg twice daily or the equivalent amount of dexamethasone, with corticosteroids continued until the severity of CRS is grade 1 or less, then tapered over 3 days,
Patients with grade 4 CRS should also receive IV methylprednisolone 1,000 mg per day for 3 days, and if symptoms improve, continue management as per grade 3, Dr. Cornell said.
Dr. Cornell reported having nothing to disclose.
REPORTING FROM ACC CARDIO-ONCOLOGY
Key clinical point: Monitor for cardiac symptoms and treat or interrupt immunotherapy as needed.
Major finding: Immune checkpoint inhibitors and CAR T-cell therapies are associated with distinct cardiovascular adverse events.
Study details: Review of strategies for managing the cardiovascular consequences of cancer immunotherapies.
Disclosures: Dr. Cornell reported having nothing to disclose.
Medical advice prompts unneeded emergency visits by AF patients
BOSTON – Patients with atrial fibrillation who present to emergency departments, despite being asymptomatic, often go based on of their understanding of advice they had previously received from their physicians, according to results from a prospective study of 356 Canadian atrial arrhythmia patients seen in emergency settings.
One way to deal with potentially inappropriate emergency department use is to have concerned patients with atrial fibrillation (AF) record their heart rhythm data with a handheld device or watch, transfer the records to their smartphones, and transmit the information to a remote physician for interpretation and advice, Benedict M. Glover, MD, said at the annual International AF Symposium.
Dr. Glover and his associates are in the process of developing a prototype system of this design to address the need they identified in a recent registry of 356 patients with a primary diagnosis of AF who sought care in the emergency department (ED) of any of seven participating Canadian medical centers, including five academic centers and two community hospitals. The survey results showed that 71% of the patients were symptomatic and 29% were asymptomatic then they first presented to an emergency department.
Case reviews of the 356 patients showed that 152 (43%) came to the EDs for what were classified as inappropriate reasons. The most common cause by far of an inappropriate emergency presentation was prior medical advice the patient had received, cited in 62% of the inappropriate cases, compared with 9% of the appropriate cases, said Dr. Glover, an electrophysiologist at Sunnybrook Health Sciences Centre in Toronto.
The inappropriate ED use by AF patients could be addressed in at least two ways, he said. One solution might be to give patients an alternative destination, so that instead of going to an emergency department they could go to an outpatient AF clinic. A second solution is to give patients a way to have their heart rhythm assessed remotely at the time of their concern. Dr. Glover said that his center had the staff capacity to deal with the potential influx of rhythm data from a pilot-sized program of remote heart-rhythm monitoring, but he conceded that scaling up to deal with the data that could come from the entire panel of AF patients managed by Sunnybrook physicians would be a huge challenge.
“The issue is what do we do with the data after we get it,” Dr. Glover said. “It’s a lot of information.”
Dr. Glover had no disclosures.
BOSTON – Patients with atrial fibrillation who present to emergency departments, despite being asymptomatic, often go based on of their understanding of advice they had previously received from their physicians, according to results from a prospective study of 356 Canadian atrial arrhythmia patients seen in emergency settings.
One way to deal with potentially inappropriate emergency department use is to have concerned patients with atrial fibrillation (AF) record their heart rhythm data with a handheld device or watch, transfer the records to their smartphones, and transmit the information to a remote physician for interpretation and advice, Benedict M. Glover, MD, said at the annual International AF Symposium.
Dr. Glover and his associates are in the process of developing a prototype system of this design to address the need they identified in a recent registry of 356 patients with a primary diagnosis of AF who sought care in the emergency department (ED) of any of seven participating Canadian medical centers, including five academic centers and two community hospitals. The survey results showed that 71% of the patients were symptomatic and 29% were asymptomatic then they first presented to an emergency department.
Case reviews of the 356 patients showed that 152 (43%) came to the EDs for what were classified as inappropriate reasons. The most common cause by far of an inappropriate emergency presentation was prior medical advice the patient had received, cited in 62% of the inappropriate cases, compared with 9% of the appropriate cases, said Dr. Glover, an electrophysiologist at Sunnybrook Health Sciences Centre in Toronto.
The inappropriate ED use by AF patients could be addressed in at least two ways, he said. One solution might be to give patients an alternative destination, so that instead of going to an emergency department they could go to an outpatient AF clinic. A second solution is to give patients a way to have their heart rhythm assessed remotely at the time of their concern. Dr. Glover said that his center had the staff capacity to deal with the potential influx of rhythm data from a pilot-sized program of remote heart-rhythm monitoring, but he conceded that scaling up to deal with the data that could come from the entire panel of AF patients managed by Sunnybrook physicians would be a huge challenge.
“The issue is what do we do with the data after we get it,” Dr. Glover said. “It’s a lot of information.”
Dr. Glover had no disclosures.
BOSTON – Patients with atrial fibrillation who present to emergency departments, despite being asymptomatic, often go based on of their understanding of advice they had previously received from their physicians, according to results from a prospective study of 356 Canadian atrial arrhythmia patients seen in emergency settings.
One way to deal with potentially inappropriate emergency department use is to have concerned patients with atrial fibrillation (AF) record their heart rhythm data with a handheld device or watch, transfer the records to their smartphones, and transmit the information to a remote physician for interpretation and advice, Benedict M. Glover, MD, said at the annual International AF Symposium.
Dr. Glover and his associates are in the process of developing a prototype system of this design to address the need they identified in a recent registry of 356 patients with a primary diagnosis of AF who sought care in the emergency department (ED) of any of seven participating Canadian medical centers, including five academic centers and two community hospitals. The survey results showed that 71% of the patients were symptomatic and 29% were asymptomatic then they first presented to an emergency department.
Case reviews of the 356 patients showed that 152 (43%) came to the EDs for what were classified as inappropriate reasons. The most common cause by far of an inappropriate emergency presentation was prior medical advice the patient had received, cited in 62% of the inappropriate cases, compared with 9% of the appropriate cases, said Dr. Glover, an electrophysiologist at Sunnybrook Health Sciences Centre in Toronto.
The inappropriate ED use by AF patients could be addressed in at least two ways, he said. One solution might be to give patients an alternative destination, so that instead of going to an emergency department they could go to an outpatient AF clinic. A second solution is to give patients a way to have their heart rhythm assessed remotely at the time of their concern. Dr. Glover said that his center had the staff capacity to deal with the potential influx of rhythm data from a pilot-sized program of remote heart-rhythm monitoring, but he conceded that scaling up to deal with the data that could come from the entire panel of AF patients managed by Sunnybrook physicians would be a huge challenge.
“The issue is what do we do with the data after we get it,” Dr. Glover said. “It’s a lot of information.”
Dr. Glover had no disclosures.
REPORTING FROM THE AF SYMPOSIUM 2019
Key clinical point:
Major finding: Among 152 AF patients who made an inappropriate ED visit, 62% cited their prior medical advice.
Study details: Prospective study of 356 AF patients who sought ED care at any of seven Canadian hospitals.
Disclosures: Dr. Glover had no disclosures.
Atrial mapping device drives more thorough AF ablations
BOSTON – An atrial mapping catheter that combines ultrasound anatomic mapping with nontouch, high-resolution, charge-density mapping resulted in a high, 73% freedom from recurrent atrial fibrillation rate 12 months after ablation procedures guided by this catheter in a single-arm, multicenter study with 121 patients with persistent atrial fibrillation followed for 1 year.
The AcQMap device tested in the study “allows you to quickly remap” the left atrium after an initial pulmonary vein isolation or after other types of ablations to find remaining areas of abnormal electrical activity on the atrial walls and then “go after those,” Atul Verma, MD, said at the annual International AF Symposium.
An analysis he reported showed that the single patient variable that linked with the highest rate of 1-year freedom from recurrent atrial fibrillation (AF) was having at least three atrial targets ablated in addition to pulmonary vein isolation. Patients who received this number of added ablations were more than nine times more likely to be free from AF after 12 months, compared with patients who received fewer additional ablations, said Dr. Verma, a cardiac electrophysiologist at Southlake Regional Health Centre in Newmarket, Ont.
The AcQMap catheter “identifies more places to ablate.” What makes it unique among currently available mapping devices is its high resolution, its use of charge-density mapping rather than voltage-based mapping, and its speed, Dr. Verma said in an interview.
The AcQMap device has Food and Drug Administration marketing approval for mapping and so is available for routine U.S. use. However, Dr. Verma cautioned that the increased freedom from persistent AF after using the catheter during ablation that he reported should be confirmed by a randomized trial. Another electrophysiologist who performs ablations but was not involved with the study, Vivek Reddy, MD, agreed with this caveat.
“Nonrandomized trials of ablation in patients with persistent AF are at best hypothesis generating. We’ve learned that the hard way; we have been burned too many times. To assess mapping of AF activity you need a randomized, controlled trial,” said Dr. Reddy, professor of medicine and director of cardiac arrhythmia services at Mount Sinai Hospital in New York.
The UNCOVER-AF (Utilizing Novel Dipole Density Capabilities to Objectively Visualize the Etiology of Rhythms in Atrial Fibrillation) study ran at 13 centers in Canada and Europe and enrolled 129 patients who had persistent AF for an average of almost 2 years, of whom 127 actually underwent an ablation procedure and 121 were followed for 12 months post ablation. Operators were free to use the AcQMap device to map the left atrium as many times as they thought necessary, generally once at the start of the procedure, a second time after they completed pulmonary vein isolation, and then a variable number of subsequent times. On average they performed about four mappings in each patient. At entry, patients had received an average of one antiarrhythmic drug. After their ablation treatment, about 10% of patients received an antiarrhythmic drug.
The investigators found no major adverse events linked to use of the mapping device. Three patients had major adverse events related to the overall ablation procedure: Two developed cardiac tamponade, and one had a stroke. No patients had an esophageal fistula or symptomatic pulmonary vein stenosis.
After the single ablation procedure and at 12-month follow-up, the prevalence of freedom from recurrent AF was 73%, and freedom from any atrial arrhythmia was 69%. As a historical comparison, Dr. Verma cited the 12-month outcome following pulmonary vein isolation and other ablative measures in the STAR AF II (Substrate and Trigger Ablation for Reduction of Atrial Fibrillation Trial Part II) trial, which reported a 59% freedom from AF rate and a 49% freedom from any atrial arrhythmia rate with or without antiarrhythmic drug treatment after pulmonary vein isolation (N Engl J Med. 2015 May 7;372[19]:1812-22).
Multivariate analysis of the new data showed that, in addition to ablation of three or more targets, two other variables also linked significantly with long-term freedom from AF: Ablation of at least two types of electrical abnormalities in the left atrial wall, which boosted the 12-month AF-free rate by 2.8 fold, and being in sinus rhythm at the start of the ablation procedure, which linked with a 5-fold higher rate of long-term freedom from AF.
Dr. Verma also reported the AF burden measured after ablation in 96 patients who each underwent an average of 85 hours of postablation heart rhythm monitoring. Ninety percent of these patients showed no AF episodes of more than 30 seconds throughout the duration of their monitoring.
UNCOVER-AF was funded by Acutus, the company that markets the AcQMap catheter. Dr. Verma has been an advisor to or speaker on behalf of Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic, and St. Jude (Abbott), and he has received research funding from Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic. He had no personal disclosures relative to Acutus. Dr. Reddy has been a consultant to, received research funding from, and has an equity stake in Acutus, and has similar relationships with more than three dozen other companies.
BOSTON – An atrial mapping catheter that combines ultrasound anatomic mapping with nontouch, high-resolution, charge-density mapping resulted in a high, 73% freedom from recurrent atrial fibrillation rate 12 months after ablation procedures guided by this catheter in a single-arm, multicenter study with 121 patients with persistent atrial fibrillation followed for 1 year.
The AcQMap device tested in the study “allows you to quickly remap” the left atrium after an initial pulmonary vein isolation or after other types of ablations to find remaining areas of abnormal electrical activity on the atrial walls and then “go after those,” Atul Verma, MD, said at the annual International AF Symposium.
An analysis he reported showed that the single patient variable that linked with the highest rate of 1-year freedom from recurrent atrial fibrillation (AF) was having at least three atrial targets ablated in addition to pulmonary vein isolation. Patients who received this number of added ablations were more than nine times more likely to be free from AF after 12 months, compared with patients who received fewer additional ablations, said Dr. Verma, a cardiac electrophysiologist at Southlake Regional Health Centre in Newmarket, Ont.
The AcQMap catheter “identifies more places to ablate.” What makes it unique among currently available mapping devices is its high resolution, its use of charge-density mapping rather than voltage-based mapping, and its speed, Dr. Verma said in an interview.
The AcQMap device has Food and Drug Administration marketing approval for mapping and so is available for routine U.S. use. However, Dr. Verma cautioned that the increased freedom from persistent AF after using the catheter during ablation that he reported should be confirmed by a randomized trial. Another electrophysiologist who performs ablations but was not involved with the study, Vivek Reddy, MD, agreed with this caveat.
“Nonrandomized trials of ablation in patients with persistent AF are at best hypothesis generating. We’ve learned that the hard way; we have been burned too many times. To assess mapping of AF activity you need a randomized, controlled trial,” said Dr. Reddy, professor of medicine and director of cardiac arrhythmia services at Mount Sinai Hospital in New York.
The UNCOVER-AF (Utilizing Novel Dipole Density Capabilities to Objectively Visualize the Etiology of Rhythms in Atrial Fibrillation) study ran at 13 centers in Canada and Europe and enrolled 129 patients who had persistent AF for an average of almost 2 years, of whom 127 actually underwent an ablation procedure and 121 were followed for 12 months post ablation. Operators were free to use the AcQMap device to map the left atrium as many times as they thought necessary, generally once at the start of the procedure, a second time after they completed pulmonary vein isolation, and then a variable number of subsequent times. On average they performed about four mappings in each patient. At entry, patients had received an average of one antiarrhythmic drug. After their ablation treatment, about 10% of patients received an antiarrhythmic drug.
The investigators found no major adverse events linked to use of the mapping device. Three patients had major adverse events related to the overall ablation procedure: Two developed cardiac tamponade, and one had a stroke. No patients had an esophageal fistula or symptomatic pulmonary vein stenosis.
After the single ablation procedure and at 12-month follow-up, the prevalence of freedom from recurrent AF was 73%, and freedom from any atrial arrhythmia was 69%. As a historical comparison, Dr. Verma cited the 12-month outcome following pulmonary vein isolation and other ablative measures in the STAR AF II (Substrate and Trigger Ablation for Reduction of Atrial Fibrillation Trial Part II) trial, which reported a 59% freedom from AF rate and a 49% freedom from any atrial arrhythmia rate with or without antiarrhythmic drug treatment after pulmonary vein isolation (N Engl J Med. 2015 May 7;372[19]:1812-22).
Multivariate analysis of the new data showed that, in addition to ablation of three or more targets, two other variables also linked significantly with long-term freedom from AF: Ablation of at least two types of electrical abnormalities in the left atrial wall, which boosted the 12-month AF-free rate by 2.8 fold, and being in sinus rhythm at the start of the ablation procedure, which linked with a 5-fold higher rate of long-term freedom from AF.
Dr. Verma also reported the AF burden measured after ablation in 96 patients who each underwent an average of 85 hours of postablation heart rhythm monitoring. Ninety percent of these patients showed no AF episodes of more than 30 seconds throughout the duration of their monitoring.
UNCOVER-AF was funded by Acutus, the company that markets the AcQMap catheter. Dr. Verma has been an advisor to or speaker on behalf of Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic, and St. Jude (Abbott), and he has received research funding from Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic. He had no personal disclosures relative to Acutus. Dr. Reddy has been a consultant to, received research funding from, and has an equity stake in Acutus, and has similar relationships with more than three dozen other companies.
BOSTON – An atrial mapping catheter that combines ultrasound anatomic mapping with nontouch, high-resolution, charge-density mapping resulted in a high, 73% freedom from recurrent atrial fibrillation rate 12 months after ablation procedures guided by this catheter in a single-arm, multicenter study with 121 patients with persistent atrial fibrillation followed for 1 year.
The AcQMap device tested in the study “allows you to quickly remap” the left atrium after an initial pulmonary vein isolation or after other types of ablations to find remaining areas of abnormal electrical activity on the atrial walls and then “go after those,” Atul Verma, MD, said at the annual International AF Symposium.
An analysis he reported showed that the single patient variable that linked with the highest rate of 1-year freedom from recurrent atrial fibrillation (AF) was having at least three atrial targets ablated in addition to pulmonary vein isolation. Patients who received this number of added ablations were more than nine times more likely to be free from AF after 12 months, compared with patients who received fewer additional ablations, said Dr. Verma, a cardiac electrophysiologist at Southlake Regional Health Centre in Newmarket, Ont.
The AcQMap catheter “identifies more places to ablate.” What makes it unique among currently available mapping devices is its high resolution, its use of charge-density mapping rather than voltage-based mapping, and its speed, Dr. Verma said in an interview.
The AcQMap device has Food and Drug Administration marketing approval for mapping and so is available for routine U.S. use. However, Dr. Verma cautioned that the increased freedom from persistent AF after using the catheter during ablation that he reported should be confirmed by a randomized trial. Another electrophysiologist who performs ablations but was not involved with the study, Vivek Reddy, MD, agreed with this caveat.
“Nonrandomized trials of ablation in patients with persistent AF are at best hypothesis generating. We’ve learned that the hard way; we have been burned too many times. To assess mapping of AF activity you need a randomized, controlled trial,” said Dr. Reddy, professor of medicine and director of cardiac arrhythmia services at Mount Sinai Hospital in New York.
The UNCOVER-AF (Utilizing Novel Dipole Density Capabilities to Objectively Visualize the Etiology of Rhythms in Atrial Fibrillation) study ran at 13 centers in Canada and Europe and enrolled 129 patients who had persistent AF for an average of almost 2 years, of whom 127 actually underwent an ablation procedure and 121 were followed for 12 months post ablation. Operators were free to use the AcQMap device to map the left atrium as many times as they thought necessary, generally once at the start of the procedure, a second time after they completed pulmonary vein isolation, and then a variable number of subsequent times. On average they performed about four mappings in each patient. At entry, patients had received an average of one antiarrhythmic drug. After their ablation treatment, about 10% of patients received an antiarrhythmic drug.
The investigators found no major adverse events linked to use of the mapping device. Three patients had major adverse events related to the overall ablation procedure: Two developed cardiac tamponade, and one had a stroke. No patients had an esophageal fistula or symptomatic pulmonary vein stenosis.
After the single ablation procedure and at 12-month follow-up, the prevalence of freedom from recurrent AF was 73%, and freedom from any atrial arrhythmia was 69%. As a historical comparison, Dr. Verma cited the 12-month outcome following pulmonary vein isolation and other ablative measures in the STAR AF II (Substrate and Trigger Ablation for Reduction of Atrial Fibrillation Trial Part II) trial, which reported a 59% freedom from AF rate and a 49% freedom from any atrial arrhythmia rate with or without antiarrhythmic drug treatment after pulmonary vein isolation (N Engl J Med. 2015 May 7;372[19]:1812-22).
Multivariate analysis of the new data showed that, in addition to ablation of three or more targets, two other variables also linked significantly with long-term freedom from AF: Ablation of at least two types of electrical abnormalities in the left atrial wall, which boosted the 12-month AF-free rate by 2.8 fold, and being in sinus rhythm at the start of the ablation procedure, which linked with a 5-fold higher rate of long-term freedom from AF.
Dr. Verma also reported the AF burden measured after ablation in 96 patients who each underwent an average of 85 hours of postablation heart rhythm monitoring. Ninety percent of these patients showed no AF episodes of more than 30 seconds throughout the duration of their monitoring.
UNCOVER-AF was funded by Acutus, the company that markets the AcQMap catheter. Dr. Verma has been an advisor to or speaker on behalf of Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic, and St. Jude (Abbott), and he has received research funding from Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic. He had no personal disclosures relative to Acutus. Dr. Reddy has been a consultant to, received research funding from, and has an equity stake in Acutus, and has similar relationships with more than three dozen other companies.
REPORTING FROM THE AF SYMPOSIUM 2019
Key clinical point: The 1-year success of AF ablation surpassed historical controls when operators used a new mapping catheter.
Major finding: Freedom from atrial fibrillation after 1 year was 73% when operators used the AcQMap catheter during ablation procedures.
Study details: UNCOVER-AF, a single-arm, multicenter study with 121 patients with persistent atrial fibrillation ablated and followed for 12 months.
Disclosures: UNCOVER-AF was funded by Acutus, the company that markets the AcQMap catheter. Dr. Verma has been an advisor to or speaker on behalf of Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic, and St. Jude (Abbott), and he has received research funding from Bayer, Biosense Webster, Boehringer Ingelheim, and Medtronic. He had no personal disclosures relative to Acutus. Dr. Reddy has been a consultant to, received research funding from, and has an equity stake in Acutus, and has similar relationships with more than three dozen other companies.
Stryker issues voluntary field action for Lifepak 15 defibrillators
Stryker has announced a voluntary field action for its Lifepak 15 monitor/defibrillators, according to a safety alert from the Food and Drug Administration.
The company is notifying certain Lifepak 15 customers of an issue causing the device to lock up after a defibrillation shock is delivered. The lockup displays as a blank monitor with the LED lights on, indicating that the power is on, but the keypad and device become nonfunctional, the FDA said. This lockup can delay delivery of therapy, which can cause injury or death.
Since the introduction of the device in 2009, 58 complaints regarding the issue have been reported, including 6 that resulted in death. In all, 13,003 devices are included in the field action.
Customers should continue to use their devices if they have been affected until a correction can be completed. If the lockup occurs, the user should press and hold the “on” button until the LED turns off, then hit the “on” button again. If this does not reset the device, the batteries should be removed and reinserted, or the device should be removed and reconnected to its power adapter, the FDA said.
Find the full press release on the FDA website.
Stryker has announced a voluntary field action for its Lifepak 15 monitor/defibrillators, according to a safety alert from the Food and Drug Administration.
The company is notifying certain Lifepak 15 customers of an issue causing the device to lock up after a defibrillation shock is delivered. The lockup displays as a blank monitor with the LED lights on, indicating that the power is on, but the keypad and device become nonfunctional, the FDA said. This lockup can delay delivery of therapy, which can cause injury or death.
Since the introduction of the device in 2009, 58 complaints regarding the issue have been reported, including 6 that resulted in death. In all, 13,003 devices are included in the field action.
Customers should continue to use their devices if they have been affected until a correction can be completed. If the lockup occurs, the user should press and hold the “on” button until the LED turns off, then hit the “on” button again. If this does not reset the device, the batteries should be removed and reinserted, or the device should be removed and reconnected to its power adapter, the FDA said.
Find the full press release on the FDA website.
Stryker has announced a voluntary field action for its Lifepak 15 monitor/defibrillators, according to a safety alert from the Food and Drug Administration.
The company is notifying certain Lifepak 15 customers of an issue causing the device to lock up after a defibrillation shock is delivered. The lockup displays as a blank monitor with the LED lights on, indicating that the power is on, but the keypad and device become nonfunctional, the FDA said. This lockup can delay delivery of therapy, which can cause injury or death.
Since the introduction of the device in 2009, 58 complaints regarding the issue have been reported, including 6 that resulted in death. In all, 13,003 devices are included in the field action.
Customers should continue to use their devices if they have been affected until a correction can be completed. If the lockup occurs, the user should press and hold the “on” button until the LED turns off, then hit the “on” button again. If this does not reset the device, the batteries should be removed and reinserted, or the device should be removed and reconnected to its power adapter, the FDA said.
Find the full press release on the FDA website.
Atrial fib guidelines updated, SPRINT MIND published, and more
This week in cardiology news, revised atrial fibrillation guidelines revamp anticoagulation, the SPRINT MIND results showing that tight BP control staves off mild cognitive impairment are published, the FDA discovers that nitrosamine-contaminated ARBs have been on the market for years, and subclinical hypothyroidism boosts the immediate risk of heart failure.
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This week in cardiology news, revised atrial fibrillation guidelines revamp anticoagulation, the SPRINT MIND results showing that tight BP control staves off mild cognitive impairment are published, the FDA discovers that nitrosamine-contaminated ARBs have been on the market for years, and subclinical hypothyroidism boosts the immediate risk of heart failure.
Amazon Alexa
Apple Podcasts
Google Podcasts
TuneIn
This week in cardiology news, revised atrial fibrillation guidelines revamp anticoagulation, the SPRINT MIND results showing that tight BP control staves off mild cognitive impairment are published, the FDA discovers that nitrosamine-contaminated ARBs have been on the market for years, and subclinical hypothyroidism boosts the immediate risk of heart failure.
Amazon Alexa
Apple Podcasts
Google Podcasts
TuneIn
Revised U.S. A fib guidelines revamp anticoagulation
The first update to U.S. medical-society guidelines for managing atrial fibrillation since 2014 raised the threshold for starting anticoagulant therapy in women, pegged the direct-acting oral anticoagulants (DOACs) as preferred over warfarin, and introduced for the first time weight loss as an important intervention tool for treating patients with an atrial arrhythmia.
On January 28, the American College of Cardiology, American Heart Association, and Heart Rhythm Society posted online a 2019 focused update (Circulation. 2019 Jan 28. doi: 10.1161/CIR.0000000000000665) to the 2014 atrial fibrillation (AF) management guidelines that the groups had previously published (J Am Coll Cardiol. 2014 Dec 2;64[21]:2246-80).
Perhaps the two most important changes, as well as the two that lead off the new document, were a pair of class I recommendations on using oral anticoagulation in AF patients.
This brought U.S. guidelines in line with European guidelines, set by the European Society of Cardiology in 2016 (Eur Heart J. 2016 Oct 7;37[38]:2893-962). It will now also mean that, because of the way the CHA2DS2-VASc score is calculated, women with AF who are at least 65 years old will no longer automatically get flagged as needing oral anticoagulant therapy.
“This is a really important shift. It’s recognition that female sex is not as important a risk factor [for AF-associated stroke] as once was thought,” commented Hugh Calkins, MD, professor of medicine at Johns Hopkins Medicine in Baltimore and a member of the panel that wrote the update. “This will change the number of women with AF who go on anticoagulation,” predicted Dr. Calkins, who directs the cardiac arrhythmia service at his center. “We have been struggling with the notion that all women 65 or older with AF had to be on an anticoagulant. Now a clinician has more leeway. In general, patients with AF remain underanticoagulated, but this clarifies practice and brings us in line with the European guidelines.”
The second important change to the anticoagulation recommendations was to specify the DOACs as recommended over warfarin in AF patients eligible for oral anticoagulation and without moderate to severe mitral stenosis or a mechanical heart valve, which also matches the 2016 European guidelines and updates the prior, 2014, U.S. guidelines, which didn’t even mention DOACs.
Prescribing a DOAC preferentially to AF patients has already become routine among electrophysiologists, but possibly not as routine among primary care physicians, so this change has the potential to shift practice, said Dr. Calkins. But the higher price for DOACs, compared with warfarin, can pose problems. “The cost of DOACs remains an issue that can be a serious limitation to some patients,” said Craig T. January, MD, professor of medicine at the University of Wisconsin in Madison and chair of the guideline-writing panel. He also bemoaned the absence of head-to-head comparisons of individual DOACs that could inform selecting among apixaban, dabigatran, edoxaban, and rivaroxaban.
Another notable change in the 2019 update was inclusion for the first time of weight loss as a recommended intervention, along with other risk factor modification, an addition that Dr. Calkins called “long overdue.”
“This is a new recommendation, and it will potentially be important,” said Dr. January, although the guidelines do not spell out how aggressive clinicians should be about having patients achieve weight loss, how much loss patients should achieve, or how they should do it. “There are a lot of observational data and basic science data suggesting the importance of weight loss. Most electrophysiologists already address weight loss. The problem is how to get patients to do it,” commented Vivek Reddy, MD, professor of medicine and director of cardiac arrhythmia services at Mount Sinai Hospital in New York.
Dr. Reddy expressed surprise over two other features of the updated guidelines. For the first time, the guidelines now address percutaneous left atrial appendage (LAA) occlusion and say: “Percutaneous LAA occlusion may be considered in patients with AF at increased risk of stroke who have contraindications to long-term anticoagulation.” The guidelines’ text acknowledges that this runs counter to the Food and Drug Administration labeling for the Watchman LAA occlusion device, which restricts the device to patients “deemed suitable for long-term warfarin (mirroring the inclusion criteria for enrollment in the clinical trials) but had an appropriate rationale to seek a nonpharmacological alternative to warfarin.”
“We do not take a position on the FDA’s” actions, Dr. January said in an interview.
“The ACC, AHA, and HRS guidelines should reflect what the FDA decided,” Dr. Reddy said in an interview. “I’m a little surprised the guidelines said that anticoagulation had to be contraindicated.
The 2019 update also added a class IIb, “may be reasonable” recommendation for catheter ablation of AF in patients with heart failure with reduced ejection fraction.
“I think a IIb recommendation is unfair; I think it should be a IIa recommendation because there have been positive results from two large, randomized, multicenter trials – CASTLE-AF [Catheter Ablation vs. Standard Conventional Treatment in Patients With LV Dysfunction and AF; N Engl J Med. 2018 Feb 1;378(5):417-27] and AATAC [Ablation vs Amiodarone for Treatment of AFib in Patients With CHF and an ICD; Circulation. 2016 Apr 26;133(7):1637-44], as well as positive results from several smaller randomized studies,” Dr. Reddy said. “I’m really surprised” that the recommendation was not stronger.
Dr. Calkins has been a consultant to Abbott, Altathera, AtriCare, Boehringer-Ingelheim, King, Medtronic, and St. Jude and has received research funding from Boehringer-Ingelheim, Boston Scientific, and St. Jude. Dr. January had no disclosures. Dr. Reddy has been a consultant to, received research funding from, or has an equity interest in more than three dozen companies.
The first update to U.S. medical-society guidelines for managing atrial fibrillation since 2014 raised the threshold for starting anticoagulant therapy in women, pegged the direct-acting oral anticoagulants (DOACs) as preferred over warfarin, and introduced for the first time weight loss as an important intervention tool for treating patients with an atrial arrhythmia.
On January 28, the American College of Cardiology, American Heart Association, and Heart Rhythm Society posted online a 2019 focused update (Circulation. 2019 Jan 28. doi: 10.1161/CIR.0000000000000665) to the 2014 atrial fibrillation (AF) management guidelines that the groups had previously published (J Am Coll Cardiol. 2014 Dec 2;64[21]:2246-80).
Perhaps the two most important changes, as well as the two that lead off the new document, were a pair of class I recommendations on using oral anticoagulation in AF patients.
This brought U.S. guidelines in line with European guidelines, set by the European Society of Cardiology in 2016 (Eur Heart J. 2016 Oct 7;37[38]:2893-962). It will now also mean that, because of the way the CHA2DS2-VASc score is calculated, women with AF who are at least 65 years old will no longer automatically get flagged as needing oral anticoagulant therapy.
“This is a really important shift. It’s recognition that female sex is not as important a risk factor [for AF-associated stroke] as once was thought,” commented Hugh Calkins, MD, professor of medicine at Johns Hopkins Medicine in Baltimore and a member of the panel that wrote the update. “This will change the number of women with AF who go on anticoagulation,” predicted Dr. Calkins, who directs the cardiac arrhythmia service at his center. “We have been struggling with the notion that all women 65 or older with AF had to be on an anticoagulant. Now a clinician has more leeway. In general, patients with AF remain underanticoagulated, but this clarifies practice and brings us in line with the European guidelines.”
The second important change to the anticoagulation recommendations was to specify the DOACs as recommended over warfarin in AF patients eligible for oral anticoagulation and without moderate to severe mitral stenosis or a mechanical heart valve, which also matches the 2016 European guidelines and updates the prior, 2014, U.S. guidelines, which didn’t even mention DOACs.
Prescribing a DOAC preferentially to AF patients has already become routine among electrophysiologists, but possibly not as routine among primary care physicians, so this change has the potential to shift practice, said Dr. Calkins. But the higher price for DOACs, compared with warfarin, can pose problems. “The cost of DOACs remains an issue that can be a serious limitation to some patients,” said Craig T. January, MD, professor of medicine at the University of Wisconsin in Madison and chair of the guideline-writing panel. He also bemoaned the absence of head-to-head comparisons of individual DOACs that could inform selecting among apixaban, dabigatran, edoxaban, and rivaroxaban.
Another notable change in the 2019 update was inclusion for the first time of weight loss as a recommended intervention, along with other risk factor modification, an addition that Dr. Calkins called “long overdue.”
“This is a new recommendation, and it will potentially be important,” said Dr. January, although the guidelines do not spell out how aggressive clinicians should be about having patients achieve weight loss, how much loss patients should achieve, or how they should do it. “There are a lot of observational data and basic science data suggesting the importance of weight loss. Most electrophysiologists already address weight loss. The problem is how to get patients to do it,” commented Vivek Reddy, MD, professor of medicine and director of cardiac arrhythmia services at Mount Sinai Hospital in New York.
Dr. Reddy expressed surprise over two other features of the updated guidelines. For the first time, the guidelines now address percutaneous left atrial appendage (LAA) occlusion and say: “Percutaneous LAA occlusion may be considered in patients with AF at increased risk of stroke who have contraindications to long-term anticoagulation.” The guidelines’ text acknowledges that this runs counter to the Food and Drug Administration labeling for the Watchman LAA occlusion device, which restricts the device to patients “deemed suitable for long-term warfarin (mirroring the inclusion criteria for enrollment in the clinical trials) but had an appropriate rationale to seek a nonpharmacological alternative to warfarin.”
“We do not take a position on the FDA’s” actions, Dr. January said in an interview.
“The ACC, AHA, and HRS guidelines should reflect what the FDA decided,” Dr. Reddy said in an interview. “I’m a little surprised the guidelines said that anticoagulation had to be contraindicated.
The 2019 update also added a class IIb, “may be reasonable” recommendation for catheter ablation of AF in patients with heart failure with reduced ejection fraction.
“I think a IIb recommendation is unfair; I think it should be a IIa recommendation because there have been positive results from two large, randomized, multicenter trials – CASTLE-AF [Catheter Ablation vs. Standard Conventional Treatment in Patients With LV Dysfunction and AF; N Engl J Med. 2018 Feb 1;378(5):417-27] and AATAC [Ablation vs Amiodarone for Treatment of AFib in Patients With CHF and an ICD; Circulation. 2016 Apr 26;133(7):1637-44], as well as positive results from several smaller randomized studies,” Dr. Reddy said. “I’m really surprised” that the recommendation was not stronger.
Dr. Calkins has been a consultant to Abbott, Altathera, AtriCare, Boehringer-Ingelheim, King, Medtronic, and St. Jude and has received research funding from Boehringer-Ingelheim, Boston Scientific, and St. Jude. Dr. January had no disclosures. Dr. Reddy has been a consultant to, received research funding from, or has an equity interest in more than three dozen companies.
The first update to U.S. medical-society guidelines for managing atrial fibrillation since 2014 raised the threshold for starting anticoagulant therapy in women, pegged the direct-acting oral anticoagulants (DOACs) as preferred over warfarin, and introduced for the first time weight loss as an important intervention tool for treating patients with an atrial arrhythmia.
On January 28, the American College of Cardiology, American Heart Association, and Heart Rhythm Society posted online a 2019 focused update (Circulation. 2019 Jan 28. doi: 10.1161/CIR.0000000000000665) to the 2014 atrial fibrillation (AF) management guidelines that the groups had previously published (J Am Coll Cardiol. 2014 Dec 2;64[21]:2246-80).
Perhaps the two most important changes, as well as the two that lead off the new document, were a pair of class I recommendations on using oral anticoagulation in AF patients.
This brought U.S. guidelines in line with European guidelines, set by the European Society of Cardiology in 2016 (Eur Heart J. 2016 Oct 7;37[38]:2893-962). It will now also mean that, because of the way the CHA2DS2-VASc score is calculated, women with AF who are at least 65 years old will no longer automatically get flagged as needing oral anticoagulant therapy.
“This is a really important shift. It’s recognition that female sex is not as important a risk factor [for AF-associated stroke] as once was thought,” commented Hugh Calkins, MD, professor of medicine at Johns Hopkins Medicine in Baltimore and a member of the panel that wrote the update. “This will change the number of women with AF who go on anticoagulation,” predicted Dr. Calkins, who directs the cardiac arrhythmia service at his center. “We have been struggling with the notion that all women 65 or older with AF had to be on an anticoagulant. Now a clinician has more leeway. In general, patients with AF remain underanticoagulated, but this clarifies practice and brings us in line with the European guidelines.”
The second important change to the anticoagulation recommendations was to specify the DOACs as recommended over warfarin in AF patients eligible for oral anticoagulation and without moderate to severe mitral stenosis or a mechanical heart valve, which also matches the 2016 European guidelines and updates the prior, 2014, U.S. guidelines, which didn’t even mention DOACs.
Prescribing a DOAC preferentially to AF patients has already become routine among electrophysiologists, but possibly not as routine among primary care physicians, so this change has the potential to shift practice, said Dr. Calkins. But the higher price for DOACs, compared with warfarin, can pose problems. “The cost of DOACs remains an issue that can be a serious limitation to some patients,” said Craig T. January, MD, professor of medicine at the University of Wisconsin in Madison and chair of the guideline-writing panel. He also bemoaned the absence of head-to-head comparisons of individual DOACs that could inform selecting among apixaban, dabigatran, edoxaban, and rivaroxaban.
Another notable change in the 2019 update was inclusion for the first time of weight loss as a recommended intervention, along with other risk factor modification, an addition that Dr. Calkins called “long overdue.”
“This is a new recommendation, and it will potentially be important,” said Dr. January, although the guidelines do not spell out how aggressive clinicians should be about having patients achieve weight loss, how much loss patients should achieve, or how they should do it. “There are a lot of observational data and basic science data suggesting the importance of weight loss. Most electrophysiologists already address weight loss. The problem is how to get patients to do it,” commented Vivek Reddy, MD, professor of medicine and director of cardiac arrhythmia services at Mount Sinai Hospital in New York.
Dr. Reddy expressed surprise over two other features of the updated guidelines. For the first time, the guidelines now address percutaneous left atrial appendage (LAA) occlusion and say: “Percutaneous LAA occlusion may be considered in patients with AF at increased risk of stroke who have contraindications to long-term anticoagulation.” The guidelines’ text acknowledges that this runs counter to the Food and Drug Administration labeling for the Watchman LAA occlusion device, which restricts the device to patients “deemed suitable for long-term warfarin (mirroring the inclusion criteria for enrollment in the clinical trials) but had an appropriate rationale to seek a nonpharmacological alternative to warfarin.”
“We do not take a position on the FDA’s” actions, Dr. January said in an interview.
“The ACC, AHA, and HRS guidelines should reflect what the FDA decided,” Dr. Reddy said in an interview. “I’m a little surprised the guidelines said that anticoagulation had to be contraindicated.
The 2019 update also added a class IIb, “may be reasonable” recommendation for catheter ablation of AF in patients with heart failure with reduced ejection fraction.
“I think a IIb recommendation is unfair; I think it should be a IIa recommendation because there have been positive results from two large, randomized, multicenter trials – CASTLE-AF [Catheter Ablation vs. Standard Conventional Treatment in Patients With LV Dysfunction and AF; N Engl J Med. 2018 Feb 1;378(5):417-27] and AATAC [Ablation vs Amiodarone for Treatment of AFib in Patients With CHF and an ICD; Circulation. 2016 Apr 26;133(7):1637-44], as well as positive results from several smaller randomized studies,” Dr. Reddy said. “I’m really surprised” that the recommendation was not stronger.
Dr. Calkins has been a consultant to Abbott, Altathera, AtriCare, Boehringer-Ingelheim, King, Medtronic, and St. Jude and has received research funding from Boehringer-Ingelheim, Boston Scientific, and St. Jude. Dr. January had no disclosures. Dr. Reddy has been a consultant to, received research funding from, or has an equity interest in more than three dozen companies.
Before you refer for AF ablation
SNOWMASS, COLO. – Appropriate in the way of benefit, along with instilling awareness of the warning signals heralding serious late complications, Samuel J. Asirvatham, MD, said at the annual Cardiovascular Conference at Snowmass sponsored by the American College of Cardiology.
“Who to steer toward ablation? You have to have a symptomatic patient – that’s a given. For the ones who are paroxysmal, the ones with a relatively normal heart, there’s a much better chance that you’ll help manage their symptoms with ablation than if they have persistent or permanent A-fib. Notice I do not use the word ‘cure’ for A-fib. We talk about controlling symptoms and decreasing frequency, because the longer follow-up you have with intensive monitoring, the more you realize that patients still tend to have some A-fib,” explained Dr. Asirvatham, an electrophysiologist who is professor of medicine and pediatrics at the Mayo Clinic in Rochester, Minn.
The rationale for early atrial fibrillation (AF) ablation in younger patients with troublesome symptoms of paroxysmal AF despite pharmacologic attempts at rate or rhythm control is that it will arrest the progression from an atrial arrhythmia that has just a few triggers readily neutralized by pulmonary vein isolation to persistent AF with a diseased heart and a multitude of arrhythmia trigger points coming from many directions.
A solid candidate for ablation of paroxysmal AF has about a 75% likelihood of having a successful first ablation procedure, with substantial improvement in symptoms and no need for medication. Another 9%-10% will achieve marked reduction in symptom burden upon addition of antiarrhythmic agents that weren’t effective before ablation.
Late complications can be deceptive
Periprocedural stroke/transient ischemic attack, tamponade, or bleeding on the table are infrequent complications readily recognized by the interventionalist. More problematic are several late complications which are often misinterpreted, with the resultant delay causing major harm.
- Pulmonary vein stenosis. This complication of inadvertent ablation inside the pulmonary vein manifests as shortness of breath, typically beginning about 4 weeks post ablation.
“This is very different from the shortness of breath they had with atrial fibrillation. They almost always have a cough that they didn’t have before, and they may have hemoptysis. It’s very important to recognize this promptly, because before it closes completely we can do an angioplasty and stent the vein with good results. But once it closes completely, it becomes an extremely complicated procedure to try to reopen that vein,” according to Dr. Asirvatham.
Very often the patient’s general cardiologist, chest physician, or primary care physician fails to recognize what’s happening. He cited an example: He recently had a patient with a cough who was first referred to an infectious disease specialist, who ordered a bronchoalveolar lavage. The specimen grew atypical actinomycetes. That prompted a referral to thoracic surgery for an open-lung biopsy. But that procedure required cardiac clearance beforehand. It was a cardiologist who said, ‘Wait – all this started after you had an ablation?’
“That patient had pulmonary vein stenosis. And, unfortunately, that complication has not gone away. Being a referral center for pulmonary vein isolation, we see just as many cases of pulmonary vein stenosis today as we did a few years ago,” he said.
- Atrial esophageal fistula. The hallmark of this complication is onset of a plethora of what Dr. Asirvatham called “funny symptoms” more than a month post ablation. These include fever, transient ischemic attacks (TIAs), sepsislike symptoms, discomfort in swallowing, and in some cases hemoptysis.
“The predominant picture is endocarditis/TIA/stroke. If you see this, and the patient has had ablation, immediately refer to surgery to have the fistula between the esophagus and heart fixed. This is not a patient where you say, ‘Nothing by mouth, give some antibiotics, and see what happens.’ I can tell you what will happen: The patient will die,” the cardiologist said.
- Atrial stiffness. This typically occurs about a month after a second or third ablation procedure, when the patient develops shortness of breath that keeps worsening.
“You think ‘pulmonary vein stenosis,’ but the CT scan shows the veins are wide open. Many of these patients will get misdiagnosed as having heart failure with preserved ejection fraction even though they never had it before. The problem here is the atrium has become too stiff from the ablation, and this stiff atrium causes increased pressure, resulting in the shortness of breath. Sometimes patients feel better over time, but sometimes it’s very difficult to treat. But it’s important to recognize atrial stiffness and exclude other causes like pulmonary vein stenosis,” Dr. Asirvatham continued.
- Gastroparesis. This occurs because of injury to the vagus nerve branches located at the top of the esophagus, with resultant delayed gastric emptying.
“It’s an uncomfortable feeling of fullness all the time. The patient will say, ‘It seems like I just ate, even though I ate 8 hours ago,” the electrophysiologist said. “Most of these patients will recover in about 6 months. They may feel better on a gastric motility agent, like a macrolide antibiotic. I personally have not seen a patient who did not feel better within 6-8 months.”
Novel treatment approaches: “A-fib may be an autonomic epilepsy of the heart”
“Patients sometimes will ask you, ‘What is this ablation? What does that mean?’ You have to be truthful and tell them that it’s just a fancy word for burning,” the electrophysiologist said.
Achievement of AF ablation without radiofrequency or cryoablation, instead utilizing nonthermal direct-current pulsed electrical fields, is “the hottest topic in the field of electrophysiology,” according to Dr. Asirvatham.
These electrical fields result in irreversible electroporation of targeted myocardial cell membranes, leading to cell death. It is a tissue-specific intervention, so it’s much less likely than conventional ablation to cause collateral damage to the esophagus and other structures.
“Direct current electroporation has transitioned from proof-of-concept studies to three relatively large patient trials. This is potentially an important breakthrough because if we don’t heat, a lot of the complications of A-fib ablation will probably decrease,” he explained.
Two other promising outside-the-box approaches to the treatment of AF are autonomic nervous system modulation at sites distant from the heart and particle beam ablation without need for cardiac catheters.
“If you put electrodes everywhere in the body to see where A-fib starts, it’s not in the atrium, not in the pulmonary veins, it’s in the nerves behind the pulmonary veins, and before those nerves it’s in some other area of the autonomic nervous system. This has given rise to the notion that A-fib may be an autonomic epilepsy of the heart,” according to the electrophysiologist.
This concept has given rise to a completely different approach to treatment of AF through neurostimulation. That’s how acupuncture works. Also, headphones have been used successfully to terminate and prevent AF by stimulating autonomic nerve centers near the ears. Low-level electrical stimulation of the vagus nerve in order to reduce stellate ganglion activity is under study. So is the application of botulinum toxin at key points in the autonomic nervous system.
“Catheters, drugs, and devices that target these areas, maybe without any ablation in the heart itself, is an exciting area of future management of A-fib,” he said.
Another promising approach is borrowed from radiation oncology: particulate ablation using beams of carbon atoms, protons, or photons.
“The first patients have now been treated for ventricular tachycardia and A-fib. It really is quite amazing how precise the lesion formation is. And with no catheters in the heart, clot can’t form on catheters,” he observed.
Dr. Asirvatham reported having no financial conflicts regarding his presentation, although he serves as a consultant to a handful of medical startup companies and holds patents on intellectual property, the royalties for which go directly to the Mayo Clinic.
SNOWMASS, COLO. – Appropriate in the way of benefit, along with instilling awareness of the warning signals heralding serious late complications, Samuel J. Asirvatham, MD, said at the annual Cardiovascular Conference at Snowmass sponsored by the American College of Cardiology.
“Who to steer toward ablation? You have to have a symptomatic patient – that’s a given. For the ones who are paroxysmal, the ones with a relatively normal heart, there’s a much better chance that you’ll help manage their symptoms with ablation than if they have persistent or permanent A-fib. Notice I do not use the word ‘cure’ for A-fib. We talk about controlling symptoms and decreasing frequency, because the longer follow-up you have with intensive monitoring, the more you realize that patients still tend to have some A-fib,” explained Dr. Asirvatham, an electrophysiologist who is professor of medicine and pediatrics at the Mayo Clinic in Rochester, Minn.
The rationale for early atrial fibrillation (AF) ablation in younger patients with troublesome symptoms of paroxysmal AF despite pharmacologic attempts at rate or rhythm control is that it will arrest the progression from an atrial arrhythmia that has just a few triggers readily neutralized by pulmonary vein isolation to persistent AF with a diseased heart and a multitude of arrhythmia trigger points coming from many directions.
A solid candidate for ablation of paroxysmal AF has about a 75% likelihood of having a successful first ablation procedure, with substantial improvement in symptoms and no need for medication. Another 9%-10% will achieve marked reduction in symptom burden upon addition of antiarrhythmic agents that weren’t effective before ablation.
Late complications can be deceptive
Periprocedural stroke/transient ischemic attack, tamponade, or bleeding on the table are infrequent complications readily recognized by the interventionalist. More problematic are several late complications which are often misinterpreted, with the resultant delay causing major harm.
- Pulmonary vein stenosis. This complication of inadvertent ablation inside the pulmonary vein manifests as shortness of breath, typically beginning about 4 weeks post ablation.
“This is very different from the shortness of breath they had with atrial fibrillation. They almost always have a cough that they didn’t have before, and they may have hemoptysis. It’s very important to recognize this promptly, because before it closes completely we can do an angioplasty and stent the vein with good results. But once it closes completely, it becomes an extremely complicated procedure to try to reopen that vein,” according to Dr. Asirvatham.
Very often the patient’s general cardiologist, chest physician, or primary care physician fails to recognize what’s happening. He cited an example: He recently had a patient with a cough who was first referred to an infectious disease specialist, who ordered a bronchoalveolar lavage. The specimen grew atypical actinomycetes. That prompted a referral to thoracic surgery for an open-lung biopsy. But that procedure required cardiac clearance beforehand. It was a cardiologist who said, ‘Wait – all this started after you had an ablation?’
“That patient had pulmonary vein stenosis. And, unfortunately, that complication has not gone away. Being a referral center for pulmonary vein isolation, we see just as many cases of pulmonary vein stenosis today as we did a few years ago,” he said.
- Atrial esophageal fistula. The hallmark of this complication is onset of a plethora of what Dr. Asirvatham called “funny symptoms” more than a month post ablation. These include fever, transient ischemic attacks (TIAs), sepsislike symptoms, discomfort in swallowing, and in some cases hemoptysis.
“The predominant picture is endocarditis/TIA/stroke. If you see this, and the patient has had ablation, immediately refer to surgery to have the fistula between the esophagus and heart fixed. This is not a patient where you say, ‘Nothing by mouth, give some antibiotics, and see what happens.’ I can tell you what will happen: The patient will die,” the cardiologist said.
- Atrial stiffness. This typically occurs about a month after a second or third ablation procedure, when the patient develops shortness of breath that keeps worsening.
“You think ‘pulmonary vein stenosis,’ but the CT scan shows the veins are wide open. Many of these patients will get misdiagnosed as having heart failure with preserved ejection fraction even though they never had it before. The problem here is the atrium has become too stiff from the ablation, and this stiff atrium causes increased pressure, resulting in the shortness of breath. Sometimes patients feel better over time, but sometimes it’s very difficult to treat. But it’s important to recognize atrial stiffness and exclude other causes like pulmonary vein stenosis,” Dr. Asirvatham continued.
- Gastroparesis. This occurs because of injury to the vagus nerve branches located at the top of the esophagus, with resultant delayed gastric emptying.
“It’s an uncomfortable feeling of fullness all the time. The patient will say, ‘It seems like I just ate, even though I ate 8 hours ago,” the electrophysiologist said. “Most of these patients will recover in about 6 months. They may feel better on a gastric motility agent, like a macrolide antibiotic. I personally have not seen a patient who did not feel better within 6-8 months.”
Novel treatment approaches: “A-fib may be an autonomic epilepsy of the heart”
“Patients sometimes will ask you, ‘What is this ablation? What does that mean?’ You have to be truthful and tell them that it’s just a fancy word for burning,” the electrophysiologist said.
Achievement of AF ablation without radiofrequency or cryoablation, instead utilizing nonthermal direct-current pulsed electrical fields, is “the hottest topic in the field of electrophysiology,” according to Dr. Asirvatham.
These electrical fields result in irreversible electroporation of targeted myocardial cell membranes, leading to cell death. It is a tissue-specific intervention, so it’s much less likely than conventional ablation to cause collateral damage to the esophagus and other structures.
“Direct current electroporation has transitioned from proof-of-concept studies to three relatively large patient trials. This is potentially an important breakthrough because if we don’t heat, a lot of the complications of A-fib ablation will probably decrease,” he explained.
Two other promising outside-the-box approaches to the treatment of AF are autonomic nervous system modulation at sites distant from the heart and particle beam ablation without need for cardiac catheters.
“If you put electrodes everywhere in the body to see where A-fib starts, it’s not in the atrium, not in the pulmonary veins, it’s in the nerves behind the pulmonary veins, and before those nerves it’s in some other area of the autonomic nervous system. This has given rise to the notion that A-fib may be an autonomic epilepsy of the heart,” according to the electrophysiologist.
This concept has given rise to a completely different approach to treatment of AF through neurostimulation. That’s how acupuncture works. Also, headphones have been used successfully to terminate and prevent AF by stimulating autonomic nerve centers near the ears. Low-level electrical stimulation of the vagus nerve in order to reduce stellate ganglion activity is under study. So is the application of botulinum toxin at key points in the autonomic nervous system.
“Catheters, drugs, and devices that target these areas, maybe without any ablation in the heart itself, is an exciting area of future management of A-fib,” he said.
Another promising approach is borrowed from radiation oncology: particulate ablation using beams of carbon atoms, protons, or photons.
“The first patients have now been treated for ventricular tachycardia and A-fib. It really is quite amazing how precise the lesion formation is. And with no catheters in the heart, clot can’t form on catheters,” he observed.
Dr. Asirvatham reported having no financial conflicts regarding his presentation, although he serves as a consultant to a handful of medical startup companies and holds patents on intellectual property, the royalties for which go directly to the Mayo Clinic.
SNOWMASS, COLO. – Appropriate in the way of benefit, along with instilling awareness of the warning signals heralding serious late complications, Samuel J. Asirvatham, MD, said at the annual Cardiovascular Conference at Snowmass sponsored by the American College of Cardiology.
“Who to steer toward ablation? You have to have a symptomatic patient – that’s a given. For the ones who are paroxysmal, the ones with a relatively normal heart, there’s a much better chance that you’ll help manage their symptoms with ablation than if they have persistent or permanent A-fib. Notice I do not use the word ‘cure’ for A-fib. We talk about controlling symptoms and decreasing frequency, because the longer follow-up you have with intensive monitoring, the more you realize that patients still tend to have some A-fib,” explained Dr. Asirvatham, an electrophysiologist who is professor of medicine and pediatrics at the Mayo Clinic in Rochester, Minn.
The rationale for early atrial fibrillation (AF) ablation in younger patients with troublesome symptoms of paroxysmal AF despite pharmacologic attempts at rate or rhythm control is that it will arrest the progression from an atrial arrhythmia that has just a few triggers readily neutralized by pulmonary vein isolation to persistent AF with a diseased heart and a multitude of arrhythmia trigger points coming from many directions.
A solid candidate for ablation of paroxysmal AF has about a 75% likelihood of having a successful first ablation procedure, with substantial improvement in symptoms and no need for medication. Another 9%-10% will achieve marked reduction in symptom burden upon addition of antiarrhythmic agents that weren’t effective before ablation.
Late complications can be deceptive
Periprocedural stroke/transient ischemic attack, tamponade, or bleeding on the table are infrequent complications readily recognized by the interventionalist. More problematic are several late complications which are often misinterpreted, with the resultant delay causing major harm.
- Pulmonary vein stenosis. This complication of inadvertent ablation inside the pulmonary vein manifests as shortness of breath, typically beginning about 4 weeks post ablation.
“This is very different from the shortness of breath they had with atrial fibrillation. They almost always have a cough that they didn’t have before, and they may have hemoptysis. It’s very important to recognize this promptly, because before it closes completely we can do an angioplasty and stent the vein with good results. But once it closes completely, it becomes an extremely complicated procedure to try to reopen that vein,” according to Dr. Asirvatham.
Very often the patient’s general cardiologist, chest physician, or primary care physician fails to recognize what’s happening. He cited an example: He recently had a patient with a cough who was first referred to an infectious disease specialist, who ordered a bronchoalveolar lavage. The specimen grew atypical actinomycetes. That prompted a referral to thoracic surgery for an open-lung biopsy. But that procedure required cardiac clearance beforehand. It was a cardiologist who said, ‘Wait – all this started after you had an ablation?’
“That patient had pulmonary vein stenosis. And, unfortunately, that complication has not gone away. Being a referral center for pulmonary vein isolation, we see just as many cases of pulmonary vein stenosis today as we did a few years ago,” he said.
- Atrial esophageal fistula. The hallmark of this complication is onset of a plethora of what Dr. Asirvatham called “funny symptoms” more than a month post ablation. These include fever, transient ischemic attacks (TIAs), sepsislike symptoms, discomfort in swallowing, and in some cases hemoptysis.
“The predominant picture is endocarditis/TIA/stroke. If you see this, and the patient has had ablation, immediately refer to surgery to have the fistula between the esophagus and heart fixed. This is not a patient where you say, ‘Nothing by mouth, give some antibiotics, and see what happens.’ I can tell you what will happen: The patient will die,” the cardiologist said.
- Atrial stiffness. This typically occurs about a month after a second or third ablation procedure, when the patient develops shortness of breath that keeps worsening.
“You think ‘pulmonary vein stenosis,’ but the CT scan shows the veins are wide open. Many of these patients will get misdiagnosed as having heart failure with preserved ejection fraction even though they never had it before. The problem here is the atrium has become too stiff from the ablation, and this stiff atrium causes increased pressure, resulting in the shortness of breath. Sometimes patients feel better over time, but sometimes it’s very difficult to treat. But it’s important to recognize atrial stiffness and exclude other causes like pulmonary vein stenosis,” Dr. Asirvatham continued.
- Gastroparesis. This occurs because of injury to the vagus nerve branches located at the top of the esophagus, with resultant delayed gastric emptying.
“It’s an uncomfortable feeling of fullness all the time. The patient will say, ‘It seems like I just ate, even though I ate 8 hours ago,” the electrophysiologist said. “Most of these patients will recover in about 6 months. They may feel better on a gastric motility agent, like a macrolide antibiotic. I personally have not seen a patient who did not feel better within 6-8 months.”
Novel treatment approaches: “A-fib may be an autonomic epilepsy of the heart”
“Patients sometimes will ask you, ‘What is this ablation? What does that mean?’ You have to be truthful and tell them that it’s just a fancy word for burning,” the electrophysiologist said.
Achievement of AF ablation without radiofrequency or cryoablation, instead utilizing nonthermal direct-current pulsed electrical fields, is “the hottest topic in the field of electrophysiology,” according to Dr. Asirvatham.
These electrical fields result in irreversible electroporation of targeted myocardial cell membranes, leading to cell death. It is a tissue-specific intervention, so it’s much less likely than conventional ablation to cause collateral damage to the esophagus and other structures.
“Direct current electroporation has transitioned from proof-of-concept studies to three relatively large patient trials. This is potentially an important breakthrough because if we don’t heat, a lot of the complications of A-fib ablation will probably decrease,” he explained.
Two other promising outside-the-box approaches to the treatment of AF are autonomic nervous system modulation at sites distant from the heart and particle beam ablation without need for cardiac catheters.
“If you put electrodes everywhere in the body to see where A-fib starts, it’s not in the atrium, not in the pulmonary veins, it’s in the nerves behind the pulmonary veins, and before those nerves it’s in some other area of the autonomic nervous system. This has given rise to the notion that A-fib may be an autonomic epilepsy of the heart,” according to the electrophysiologist.
This concept has given rise to a completely different approach to treatment of AF through neurostimulation. That’s how acupuncture works. Also, headphones have been used successfully to terminate and prevent AF by stimulating autonomic nerve centers near the ears. Low-level electrical stimulation of the vagus nerve in order to reduce stellate ganglion activity is under study. So is the application of botulinum toxin at key points in the autonomic nervous system.
“Catheters, drugs, and devices that target these areas, maybe without any ablation in the heart itself, is an exciting area of future management of A-fib,” he said.
Another promising approach is borrowed from radiation oncology: particulate ablation using beams of carbon atoms, protons, or photons.
“The first patients have now been treated for ventricular tachycardia and A-fib. It really is quite amazing how precise the lesion formation is. And with no catheters in the heart, clot can’t form on catheters,” he observed.
Dr. Asirvatham reported having no financial conflicts regarding his presentation, although he serves as a consultant to a handful of medical startup companies and holds patents on intellectual property, the royalties for which go directly to the Mayo Clinic.
REPORTING FROM ACC SNOWMASS 2019
CABANA: Ablation surpassed drugs for raising AF quality of life
BOSTON – Ablation of atrial fibrillation led to significantly better quality of life improvements, compared with antiarrhythmic drug therapy, in a prespecified, secondary analysis of data from the CABANA multicenter, randomized trial with 2,204 patients.
The improvements in quality of life measures in atrial fibrillation (AF) patients following ablation were “clinically meaningful” relative to drug therapy and were sustained for 5 years of follow-up, said Douglas L. Packer, MD, at the annual International AF Symposium.
The apparent incremental benefit in quality of life after ablation, compared with patients treated with drug therapy, added to the benefits previously reported from CABANA (Catheter Ablation vs. Antiarrhythmic Drug Therapy for Atrial Fibrillation Trial) using ablation that included a highly significant reduction in recurrent AF and a significant reduction in the combined endpoint of mortality or cardiovascular hospitalization. However, the trial’s results were neutral for the study’s prespecified primary endpoint, a combination of the rate of total mortality, disabling stroke, serious bleeding, or cardiac arrest in an intention-to-treat analysis, a result first reported by Dr. Packer at the annual scientific sessions of the Heart Rhythm Society in May 2018.
When Dr. Packer spoke at the AF Symposium in late January 2019, the CABANA results had still not been published. He said that he expected an article with the main findings to appear online sometime in February 2019.
The quality of life analysis, focused on two measures, the Mayo AF-Specific Symptoms Inventory (MAFSI) (Circulation. 2008 Oct 28;118[suppl 18]:S589) and the Atrial Fibrillation Affect on Quality of Life (AFEQT) (Circ Arrhythm Electrophysiol. 2011 Feb;4[1]:15-25). The patients enrolled in the two treatment arms of CABANA had essentially identical baseline MAFSI frequency scores, but starting 3 months after entry patients randomized to the ablation arm had an average, statistically significant 1.6-point improvement in their adjusted MAFSI frequency score, compared with patients in the drug-therapy arm; this reduction persisted at about the same statistically significant level through 5 years, said Dr. Packer, an electrophysiologist and professor of medicine at the Mayo Clinic in Rochester, Minn., and lead investigator of CABANA. Patients who remained in follow-up throughout the study’s entire 60 months underwent a total of seven MAFSI assessments after their initial treatment; the average, adjusted difference in MAFSI frequency scores throughout CABANA was a statistically significant 1.4 points lower among ablated patients, compared with those randomized to drug therapy, said Dr. Packer, who presented data first reported by the CABANA researchers in 2018.
The pattern of change in the AFEQT scores was very similar. The average, adjusted AFEQT summary scores were virtually identical at baseline for the two treatment arms, but at 3 months after the study began patients in the ablation arm had an average, adjusted, statistically significant 3-point improvement in their AFEQT summary scores, compared with drug-treated patients; this incremental increase in AFEQT scores remained consistent and statistically significant through 5 years of follow-up. Throughout the study, the average, adjusted, incremental improvement in AFEQT after ablation was a statistically significant 3.4 points, said Dr. Packer.
But these quality of life measures in patients who received unblinded assignment to an ablation procedure or drug treatment in CABANA are likely unreliable, commented Peter R. Kowey, MD, an electrophysiologist at the Lankenau Heart Institute in Wynnewood, Penn., and professor of medicine at Jefferson Medical College, Philadelphia.
“Assessing quality of life in an unblinded trial seems to me to be pretty shallow,” said Dr. Kowey, a member of the CABANA steering committee and a participant in a panel at the Symposium that discussed the results. Patients who have just gone through a 6-hour procedure will often say they now feel a whole lot better, he suggested. “They’re concerned what will get done to them if they don’t say they feel better.” The same confounding also applies to other “soft” secondary endpoints used in CABANA, such as hospitalization rates.
The reliability of these more subjective outcome measures is reduced in an unblinded trial, Dr. Kowey maintained. The CABANA results “don’t change the fundamental principal of using hard endpoints,” such as those that made up the primary endpoint of the study, he said in an interview. “We put secondary endpoints into the study because they are legitimate things to look at, but they have questionable reliability,” as measures of ablation’s efficacy.
Dr. Kowey also cautioned against focusing on the per-protocol and treatment-received analyses of the CABANA results, prespecified analyses that Dr. Packer highlighted because of the high number of crossovers in the trial: 9% of patients assigned to ablation never received it and 28% of patients assigned to drug therapy actually received ablation.
The CABANA steering committee anticipated a high crossover rate, but still set the intention-to-treat analysis as primary because “per protocol introduces many biases and can’t be relied on for a study of this magnitude,” Dr. Kowey said. He also cited the statistical pitfalls of looking at multiple secondary endpoints in the CABANA results and the danger of reading too much into subgroup analyses, all from a trial with a neutral primary endpoint.
Another concern he raised centered on the generalizability of CABANA’s safety findings, which showed roughly similar adverse event rates between the two treatment arms – about 9% with ablation, 4% with drugs – although the distribution of complications types differed between the two arms. The “ ‘remarkably safe’ performance of ablation in CABANA can be attributed to ‘cherry-picked’ investigators” who performed the ablation procedures at high-volume centers, said Dr. Kowey. “The safety of ablation was predictable” in CABANA because of the selection of participating centers. “Seventy percent of U.S. ablations are being done at centers that do fewer than 25 ablations annually,” Dr. Kowey said. “We don’t know what goes on” at lower-volume centers; “ablation can’t be considered as safe as we presume” when done at centers outside the 118 sites that participated in CABANA, he maintained.
CABANA received partial funding from Biosense Webster, Boston Scientific, Medtronic, and St. Jude. Dr. Packer has been a consultant to these four companies as well as to CyberHeart, nContact, Sanofi-Aventis, and Toray. He has received research funding from AG, Biosense Webster, Boston Scientific, CryoCath, EP Limited, and Medtronic, and has a financial interest in AF mapping technology. Dr. Kowey has been a consultant to several companies that market antiarrhythmic drugs or market arrhythmia devices and has an equity interest in BioTelemetry.
BOSTON – Ablation of atrial fibrillation led to significantly better quality of life improvements, compared with antiarrhythmic drug therapy, in a prespecified, secondary analysis of data from the CABANA multicenter, randomized trial with 2,204 patients.
The improvements in quality of life measures in atrial fibrillation (AF) patients following ablation were “clinically meaningful” relative to drug therapy and were sustained for 5 years of follow-up, said Douglas L. Packer, MD, at the annual International AF Symposium.
The apparent incremental benefit in quality of life after ablation, compared with patients treated with drug therapy, added to the benefits previously reported from CABANA (Catheter Ablation vs. Antiarrhythmic Drug Therapy for Atrial Fibrillation Trial) using ablation that included a highly significant reduction in recurrent AF and a significant reduction in the combined endpoint of mortality or cardiovascular hospitalization. However, the trial’s results were neutral for the study’s prespecified primary endpoint, a combination of the rate of total mortality, disabling stroke, serious bleeding, or cardiac arrest in an intention-to-treat analysis, a result first reported by Dr. Packer at the annual scientific sessions of the Heart Rhythm Society in May 2018.
When Dr. Packer spoke at the AF Symposium in late January 2019, the CABANA results had still not been published. He said that he expected an article with the main findings to appear online sometime in February 2019.
The quality of life analysis, focused on two measures, the Mayo AF-Specific Symptoms Inventory (MAFSI) (Circulation. 2008 Oct 28;118[suppl 18]:S589) and the Atrial Fibrillation Affect on Quality of Life (AFEQT) (Circ Arrhythm Electrophysiol. 2011 Feb;4[1]:15-25). The patients enrolled in the two treatment arms of CABANA had essentially identical baseline MAFSI frequency scores, but starting 3 months after entry patients randomized to the ablation arm had an average, statistically significant 1.6-point improvement in their adjusted MAFSI frequency score, compared with patients in the drug-therapy arm; this reduction persisted at about the same statistically significant level through 5 years, said Dr. Packer, an electrophysiologist and professor of medicine at the Mayo Clinic in Rochester, Minn., and lead investigator of CABANA. Patients who remained in follow-up throughout the study’s entire 60 months underwent a total of seven MAFSI assessments after their initial treatment; the average, adjusted difference in MAFSI frequency scores throughout CABANA was a statistically significant 1.4 points lower among ablated patients, compared with those randomized to drug therapy, said Dr. Packer, who presented data first reported by the CABANA researchers in 2018.
The pattern of change in the AFEQT scores was very similar. The average, adjusted AFEQT summary scores were virtually identical at baseline for the two treatment arms, but at 3 months after the study began patients in the ablation arm had an average, adjusted, statistically significant 3-point improvement in their AFEQT summary scores, compared with drug-treated patients; this incremental increase in AFEQT scores remained consistent and statistically significant through 5 years of follow-up. Throughout the study, the average, adjusted, incremental improvement in AFEQT after ablation was a statistically significant 3.4 points, said Dr. Packer.
But these quality of life measures in patients who received unblinded assignment to an ablation procedure or drug treatment in CABANA are likely unreliable, commented Peter R. Kowey, MD, an electrophysiologist at the Lankenau Heart Institute in Wynnewood, Penn., and professor of medicine at Jefferson Medical College, Philadelphia.
“Assessing quality of life in an unblinded trial seems to me to be pretty shallow,” said Dr. Kowey, a member of the CABANA steering committee and a participant in a panel at the Symposium that discussed the results. Patients who have just gone through a 6-hour procedure will often say they now feel a whole lot better, he suggested. “They’re concerned what will get done to them if they don’t say they feel better.” The same confounding also applies to other “soft” secondary endpoints used in CABANA, such as hospitalization rates.
The reliability of these more subjective outcome measures is reduced in an unblinded trial, Dr. Kowey maintained. The CABANA results “don’t change the fundamental principal of using hard endpoints,” such as those that made up the primary endpoint of the study, he said in an interview. “We put secondary endpoints into the study because they are legitimate things to look at, but they have questionable reliability,” as measures of ablation’s efficacy.
Dr. Kowey also cautioned against focusing on the per-protocol and treatment-received analyses of the CABANA results, prespecified analyses that Dr. Packer highlighted because of the high number of crossovers in the trial: 9% of patients assigned to ablation never received it and 28% of patients assigned to drug therapy actually received ablation.
The CABANA steering committee anticipated a high crossover rate, but still set the intention-to-treat analysis as primary because “per protocol introduces many biases and can’t be relied on for a study of this magnitude,” Dr. Kowey said. He also cited the statistical pitfalls of looking at multiple secondary endpoints in the CABANA results and the danger of reading too much into subgroup analyses, all from a trial with a neutral primary endpoint.
Another concern he raised centered on the generalizability of CABANA’s safety findings, which showed roughly similar adverse event rates between the two treatment arms – about 9% with ablation, 4% with drugs – although the distribution of complications types differed between the two arms. The “ ‘remarkably safe’ performance of ablation in CABANA can be attributed to ‘cherry-picked’ investigators” who performed the ablation procedures at high-volume centers, said Dr. Kowey. “The safety of ablation was predictable” in CABANA because of the selection of participating centers. “Seventy percent of U.S. ablations are being done at centers that do fewer than 25 ablations annually,” Dr. Kowey said. “We don’t know what goes on” at lower-volume centers; “ablation can’t be considered as safe as we presume” when done at centers outside the 118 sites that participated in CABANA, he maintained.
CABANA received partial funding from Biosense Webster, Boston Scientific, Medtronic, and St. Jude. Dr. Packer has been a consultant to these four companies as well as to CyberHeart, nContact, Sanofi-Aventis, and Toray. He has received research funding from AG, Biosense Webster, Boston Scientific, CryoCath, EP Limited, and Medtronic, and has a financial interest in AF mapping technology. Dr. Kowey has been a consultant to several companies that market antiarrhythmic drugs or market arrhythmia devices and has an equity interest in BioTelemetry.
BOSTON – Ablation of atrial fibrillation led to significantly better quality of life improvements, compared with antiarrhythmic drug therapy, in a prespecified, secondary analysis of data from the CABANA multicenter, randomized trial with 2,204 patients.
The improvements in quality of life measures in atrial fibrillation (AF) patients following ablation were “clinically meaningful” relative to drug therapy and were sustained for 5 years of follow-up, said Douglas L. Packer, MD, at the annual International AF Symposium.
The apparent incremental benefit in quality of life after ablation, compared with patients treated with drug therapy, added to the benefits previously reported from CABANA (Catheter Ablation vs. Antiarrhythmic Drug Therapy for Atrial Fibrillation Trial) using ablation that included a highly significant reduction in recurrent AF and a significant reduction in the combined endpoint of mortality or cardiovascular hospitalization. However, the trial’s results were neutral for the study’s prespecified primary endpoint, a combination of the rate of total mortality, disabling stroke, serious bleeding, or cardiac arrest in an intention-to-treat analysis, a result first reported by Dr. Packer at the annual scientific sessions of the Heart Rhythm Society in May 2018.
When Dr. Packer spoke at the AF Symposium in late January 2019, the CABANA results had still not been published. He said that he expected an article with the main findings to appear online sometime in February 2019.
The quality of life analysis, focused on two measures, the Mayo AF-Specific Symptoms Inventory (MAFSI) (Circulation. 2008 Oct 28;118[suppl 18]:S589) and the Atrial Fibrillation Affect on Quality of Life (AFEQT) (Circ Arrhythm Electrophysiol. 2011 Feb;4[1]:15-25). The patients enrolled in the two treatment arms of CABANA had essentially identical baseline MAFSI frequency scores, but starting 3 months after entry patients randomized to the ablation arm had an average, statistically significant 1.6-point improvement in their adjusted MAFSI frequency score, compared with patients in the drug-therapy arm; this reduction persisted at about the same statistically significant level through 5 years, said Dr. Packer, an electrophysiologist and professor of medicine at the Mayo Clinic in Rochester, Minn., and lead investigator of CABANA. Patients who remained in follow-up throughout the study’s entire 60 months underwent a total of seven MAFSI assessments after their initial treatment; the average, adjusted difference in MAFSI frequency scores throughout CABANA was a statistically significant 1.4 points lower among ablated patients, compared with those randomized to drug therapy, said Dr. Packer, who presented data first reported by the CABANA researchers in 2018.
The pattern of change in the AFEQT scores was very similar. The average, adjusted AFEQT summary scores were virtually identical at baseline for the two treatment arms, but at 3 months after the study began patients in the ablation arm had an average, adjusted, statistically significant 3-point improvement in their AFEQT summary scores, compared with drug-treated patients; this incremental increase in AFEQT scores remained consistent and statistically significant through 5 years of follow-up. Throughout the study, the average, adjusted, incremental improvement in AFEQT after ablation was a statistically significant 3.4 points, said Dr. Packer.
But these quality of life measures in patients who received unblinded assignment to an ablation procedure or drug treatment in CABANA are likely unreliable, commented Peter R. Kowey, MD, an electrophysiologist at the Lankenau Heart Institute in Wynnewood, Penn., and professor of medicine at Jefferson Medical College, Philadelphia.
“Assessing quality of life in an unblinded trial seems to me to be pretty shallow,” said Dr. Kowey, a member of the CABANA steering committee and a participant in a panel at the Symposium that discussed the results. Patients who have just gone through a 6-hour procedure will often say they now feel a whole lot better, he suggested. “They’re concerned what will get done to them if they don’t say they feel better.” The same confounding also applies to other “soft” secondary endpoints used in CABANA, such as hospitalization rates.
The reliability of these more subjective outcome measures is reduced in an unblinded trial, Dr. Kowey maintained. The CABANA results “don’t change the fundamental principal of using hard endpoints,” such as those that made up the primary endpoint of the study, he said in an interview. “We put secondary endpoints into the study because they are legitimate things to look at, but they have questionable reliability,” as measures of ablation’s efficacy.
Dr. Kowey also cautioned against focusing on the per-protocol and treatment-received analyses of the CABANA results, prespecified analyses that Dr. Packer highlighted because of the high number of crossovers in the trial: 9% of patients assigned to ablation never received it and 28% of patients assigned to drug therapy actually received ablation.
The CABANA steering committee anticipated a high crossover rate, but still set the intention-to-treat analysis as primary because “per protocol introduces many biases and can’t be relied on for a study of this magnitude,” Dr. Kowey said. He also cited the statistical pitfalls of looking at multiple secondary endpoints in the CABANA results and the danger of reading too much into subgroup analyses, all from a trial with a neutral primary endpoint.
Another concern he raised centered on the generalizability of CABANA’s safety findings, which showed roughly similar adverse event rates between the two treatment arms – about 9% with ablation, 4% with drugs – although the distribution of complications types differed between the two arms. The “ ‘remarkably safe’ performance of ablation in CABANA can be attributed to ‘cherry-picked’ investigators” who performed the ablation procedures at high-volume centers, said Dr. Kowey. “The safety of ablation was predictable” in CABANA because of the selection of participating centers. “Seventy percent of U.S. ablations are being done at centers that do fewer than 25 ablations annually,” Dr. Kowey said. “We don’t know what goes on” at lower-volume centers; “ablation can’t be considered as safe as we presume” when done at centers outside the 118 sites that participated in CABANA, he maintained.
CABANA received partial funding from Biosense Webster, Boston Scientific, Medtronic, and St. Jude. Dr. Packer has been a consultant to these four companies as well as to CyberHeart, nContact, Sanofi-Aventis, and Toray. He has received research funding from AG, Biosense Webster, Boston Scientific, CryoCath, EP Limited, and Medtronic, and has a financial interest in AF mapping technology. Dr. Kowey has been a consultant to several companies that market antiarrhythmic drugs or market arrhythmia devices and has an equity interest in BioTelemetry.
REPORTING FROM THE AF SYMPOSIUM 2019
Key clinical point: In CABANA, atrial fibrillation ablation led to a clinically meaningful improvement of quality of life measures, compared with drug therapy.
Major finding: After ablation, the MAFSI score averaged a 1.4-point improvement; the AFEQT score averaged a 3.4-point improvement over drug therapy.
Study details: CABANA, a multicenter, randomized trial with 2,204 atrial fibrillation patients.
Disclosures: CABANA received partial funding from Biosense Webster, Boston Scientific, Medtronic, and St. Jude. Dr. Packer has been a consultant to these four companies as well as to CyberHeart, nContact, Sanofi-Aventis, and Toray. He has received research funding from AG, Biosense Webster, Boston Scientific, CryoCath, EP Limited, and Medtronic, and has a financial interest in atrial fibrillation mapping technology. Dr. Kowey has been a consultant to several companies that market antiarrhythmic drugs or market arrhythmia devices and has an equity interest in BioTelemetry.