User login
Empagliflozin failed to improve exercise capacity in heart failure
Empagliflozin showed favorable effects on diuretic use and congestion symptoms in patients with heart failure with reduced ejection fraction (HFrEF), but the oral sodium glucose cotransporter 2 (SGLT2) inhibitor did not improve the primary endpoint of improved exercise capacity in the EMPERIAL-Reduced trial, investigators reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
In the matching EMPERIAL-Preserved trial, conducted in patients with heart failure with preserved ejection fraction (HFpEF), empagliflozin (Jardiance) produced modest improvements in diuretic use, as well as a reduction in unscheduled outpatient visits, compared with placebo-treated controls, although these trends failed to achieve statistical significance. And as in the EMPERIAL-Reduced trial, the SGLT2 inhibitor didn’t move the needle at all on the primary endpoint of improved exercise capacity as measured by 6-minute hall walk distance.
EMPERIAL-Reduced and -Preserved were identically designed, concurrent, phase 3, double-blind, 12-week randomized trials of empagliflozin versus placebo in 312 patients with HFrEF and 315 with HFpEF, defined in EMPERIAL-preserved as a left ventricular ejection fraction above 40%. The majority of participants had type 2 diabetes.
From a baseline median 6-minute walk distance of about 300 meters, the 6-minute walk distance at week 12 was actually 4.0 meters worse in the empagliflozin-treated HFrEF patients than it was in controls and a mere 4.0 meters better than with placebo in empagliflozin-treated patients with HFpEF, reported William T. Abraham, MD, professor of medicine, director of the division of cardiovascular medicine, and associate dean at Ohio State University, Columbus.
He indicated that the audience shouldn’t make too much of the failure to achieve the primary endpoint in the two trials in light of the studies’ major limitations: namely, their relatively small size for purposes of evaluating clinical outcomes and the relatively short 12-week duration.
“In many ways, I would say it’s remarkable that we can observe a positive signal, a favorable signal, in outcomes around congestion. In the case of HFrEF it’s statistically significant, and in HFpEF it’s a trend towards improvement. Of course, there are larger trials ongoing that may confirm these observations. Hopefully the EMPERIAL trials predict a good outcome for those ongoing trials,” Dr. Abraham said.
Piotr Ponikowski, MD, presented the study results for the secondary outcomes of congestion symptoms, diuretic use, and utilization of health care resources. In EMPERIAL-Reduced, intensification of diuretic therapy – often a prelude to acute decompensation and a trip to the hospital – occurred at a rate of 4.5% with empagliflozin and 16.1% with placebo, for a highly significant 73% relative risk reduction. Intensification of loop diuretics occurred in 2.6% of the empagliflozin group and 14.2% of controls, for a 82% risk reduction.
“That’s a pretty significant effect,” observed Dr. Ponikowski, professor of cardiology and head of the department of heart diseases at the Medical University of Wroclaw (Poland).
Moreover, a congestion symptoms score comprising a summary of orthopnea, jugular veinous distention, and edema improved by 47% after 12 weeks on empagliflozin, a statistically significant and clinically meaningful improvement that grew in magnitude over time and at 12 weeks was twice as large, compared with the reduction in placebo group, he added.
There was a trend for fewer unscheduled outpatient visits in the empagliflozin arm of EMPERIAL-Reduced with a rate of 10.4%, compared with 25.8% in controls; however, this 26% reduction in relative risk did not achieve statistical significance.
Intensification of loop diuretics occurred in 9% of EMPERIAL-Preserved participants on empagliflozin and 13.5% on placebo, but this 34% reduction in risk didn’t reach significance.
Adverse events in the EMPERIAL trials were similar across the active treatment and placebo arms. The benign safety profile was similar to what was seen in the earlier major clinical trials of empagliflozin for treatment of type 2 diabetes.
Session chair Stephane Heymans, MD, PhD, of the University of Maastricht (the Netherlands) noted that a substantial minority of patients in EMPERIAL-Reduced were on the combined neprilysin inhibitor sacubitril and the angiotensin receptor blocker valsartan (Entresto), whereas far fewer were in EMPERIAL-Preserved. He wondered if this greater use of background sacubitril/valsartan could explain empagliflozin’s greater efficacy in EMPERIAL-Reduced.
Highly unlikely, according to the investigators.
“It looks like, as is the case with most of our heart failure therapies, that we do see incremental value here. If you met the criteria for these trials, it appears you derived benefit from empagliflozin regardless of whether you were on an angiotensin receptor neprilysin inhibitor or not. I think that speaks to the incremental benefit of SGLT2 inhibitors on top of current guideline-directed medical therapy,” Dr. Abraham said.
Dr. Ponikowski observed that the same point was underscored in the DAPA-HF trial of the SGLT2 inhibitor dapagliflozin (Farxiga) in patients with heart failure (DAPA-HF: N Engl J Med. 2019 Nov 21;381[21]:1995-2008).
“You’ll see that the mortality and morbidity and quality-of-life benefit is in those treated with dapagliflozin with or without angiotensin receptor neprilysin inhibition; so, regardless of background therapy. And the effect is especially clear in patients on both therapies,” the cardiologist said.
The EMPERIAL trials were sponsored by Boehringer Ingelheim. Dr. Abraham and Dr. Ponikowksi reported receiving consultant fees from the company for serving on the trials’ executive committee.
Empagliflozin showed favorable effects on diuretic use and congestion symptoms in patients with heart failure with reduced ejection fraction (HFrEF), but the oral sodium glucose cotransporter 2 (SGLT2) inhibitor did not improve the primary endpoint of improved exercise capacity in the EMPERIAL-Reduced trial, investigators reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
In the matching EMPERIAL-Preserved trial, conducted in patients with heart failure with preserved ejection fraction (HFpEF), empagliflozin (Jardiance) produced modest improvements in diuretic use, as well as a reduction in unscheduled outpatient visits, compared with placebo-treated controls, although these trends failed to achieve statistical significance. And as in the EMPERIAL-Reduced trial, the SGLT2 inhibitor didn’t move the needle at all on the primary endpoint of improved exercise capacity as measured by 6-minute hall walk distance.
EMPERIAL-Reduced and -Preserved were identically designed, concurrent, phase 3, double-blind, 12-week randomized trials of empagliflozin versus placebo in 312 patients with HFrEF and 315 with HFpEF, defined in EMPERIAL-preserved as a left ventricular ejection fraction above 40%. The majority of participants had type 2 diabetes.
From a baseline median 6-minute walk distance of about 300 meters, the 6-minute walk distance at week 12 was actually 4.0 meters worse in the empagliflozin-treated HFrEF patients than it was in controls and a mere 4.0 meters better than with placebo in empagliflozin-treated patients with HFpEF, reported William T. Abraham, MD, professor of medicine, director of the division of cardiovascular medicine, and associate dean at Ohio State University, Columbus.
He indicated that the audience shouldn’t make too much of the failure to achieve the primary endpoint in the two trials in light of the studies’ major limitations: namely, their relatively small size for purposes of evaluating clinical outcomes and the relatively short 12-week duration.
“In many ways, I would say it’s remarkable that we can observe a positive signal, a favorable signal, in outcomes around congestion. In the case of HFrEF it’s statistically significant, and in HFpEF it’s a trend towards improvement. Of course, there are larger trials ongoing that may confirm these observations. Hopefully the EMPERIAL trials predict a good outcome for those ongoing trials,” Dr. Abraham said.
Piotr Ponikowski, MD, presented the study results for the secondary outcomes of congestion symptoms, diuretic use, and utilization of health care resources. In EMPERIAL-Reduced, intensification of diuretic therapy – often a prelude to acute decompensation and a trip to the hospital – occurred at a rate of 4.5% with empagliflozin and 16.1% with placebo, for a highly significant 73% relative risk reduction. Intensification of loop diuretics occurred in 2.6% of the empagliflozin group and 14.2% of controls, for a 82% risk reduction.
“That’s a pretty significant effect,” observed Dr. Ponikowski, professor of cardiology and head of the department of heart diseases at the Medical University of Wroclaw (Poland).
Moreover, a congestion symptoms score comprising a summary of orthopnea, jugular veinous distention, and edema improved by 47% after 12 weeks on empagliflozin, a statistically significant and clinically meaningful improvement that grew in magnitude over time and at 12 weeks was twice as large, compared with the reduction in placebo group, he added.
There was a trend for fewer unscheduled outpatient visits in the empagliflozin arm of EMPERIAL-Reduced with a rate of 10.4%, compared with 25.8% in controls; however, this 26% reduction in relative risk did not achieve statistical significance.
Intensification of loop diuretics occurred in 9% of EMPERIAL-Preserved participants on empagliflozin and 13.5% on placebo, but this 34% reduction in risk didn’t reach significance.
Adverse events in the EMPERIAL trials were similar across the active treatment and placebo arms. The benign safety profile was similar to what was seen in the earlier major clinical trials of empagliflozin for treatment of type 2 diabetes.
Session chair Stephane Heymans, MD, PhD, of the University of Maastricht (the Netherlands) noted that a substantial minority of patients in EMPERIAL-Reduced were on the combined neprilysin inhibitor sacubitril and the angiotensin receptor blocker valsartan (Entresto), whereas far fewer were in EMPERIAL-Preserved. He wondered if this greater use of background sacubitril/valsartan could explain empagliflozin’s greater efficacy in EMPERIAL-Reduced.
Highly unlikely, according to the investigators.
“It looks like, as is the case with most of our heart failure therapies, that we do see incremental value here. If you met the criteria for these trials, it appears you derived benefit from empagliflozin regardless of whether you were on an angiotensin receptor neprilysin inhibitor or not. I think that speaks to the incremental benefit of SGLT2 inhibitors on top of current guideline-directed medical therapy,” Dr. Abraham said.
Dr. Ponikowski observed that the same point was underscored in the DAPA-HF trial of the SGLT2 inhibitor dapagliflozin (Farxiga) in patients with heart failure (DAPA-HF: N Engl J Med. 2019 Nov 21;381[21]:1995-2008).
“You’ll see that the mortality and morbidity and quality-of-life benefit is in those treated with dapagliflozin with or without angiotensin receptor neprilysin inhibition; so, regardless of background therapy. And the effect is especially clear in patients on both therapies,” the cardiologist said.
The EMPERIAL trials were sponsored by Boehringer Ingelheim. Dr. Abraham and Dr. Ponikowksi reported receiving consultant fees from the company for serving on the trials’ executive committee.
Empagliflozin showed favorable effects on diuretic use and congestion symptoms in patients with heart failure with reduced ejection fraction (HFrEF), but the oral sodium glucose cotransporter 2 (SGLT2) inhibitor did not improve the primary endpoint of improved exercise capacity in the EMPERIAL-Reduced trial, investigators reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
In the matching EMPERIAL-Preserved trial, conducted in patients with heart failure with preserved ejection fraction (HFpEF), empagliflozin (Jardiance) produced modest improvements in diuretic use, as well as a reduction in unscheduled outpatient visits, compared with placebo-treated controls, although these trends failed to achieve statistical significance. And as in the EMPERIAL-Reduced trial, the SGLT2 inhibitor didn’t move the needle at all on the primary endpoint of improved exercise capacity as measured by 6-minute hall walk distance.
EMPERIAL-Reduced and -Preserved were identically designed, concurrent, phase 3, double-blind, 12-week randomized trials of empagliflozin versus placebo in 312 patients with HFrEF and 315 with HFpEF, defined in EMPERIAL-preserved as a left ventricular ejection fraction above 40%. The majority of participants had type 2 diabetes.
From a baseline median 6-minute walk distance of about 300 meters, the 6-minute walk distance at week 12 was actually 4.0 meters worse in the empagliflozin-treated HFrEF patients than it was in controls and a mere 4.0 meters better than with placebo in empagliflozin-treated patients with HFpEF, reported William T. Abraham, MD, professor of medicine, director of the division of cardiovascular medicine, and associate dean at Ohio State University, Columbus.
He indicated that the audience shouldn’t make too much of the failure to achieve the primary endpoint in the two trials in light of the studies’ major limitations: namely, their relatively small size for purposes of evaluating clinical outcomes and the relatively short 12-week duration.
“In many ways, I would say it’s remarkable that we can observe a positive signal, a favorable signal, in outcomes around congestion. In the case of HFrEF it’s statistically significant, and in HFpEF it’s a trend towards improvement. Of course, there are larger trials ongoing that may confirm these observations. Hopefully the EMPERIAL trials predict a good outcome for those ongoing trials,” Dr. Abraham said.
Piotr Ponikowski, MD, presented the study results for the secondary outcomes of congestion symptoms, diuretic use, and utilization of health care resources. In EMPERIAL-Reduced, intensification of diuretic therapy – often a prelude to acute decompensation and a trip to the hospital – occurred at a rate of 4.5% with empagliflozin and 16.1% with placebo, for a highly significant 73% relative risk reduction. Intensification of loop diuretics occurred in 2.6% of the empagliflozin group and 14.2% of controls, for a 82% risk reduction.
“That’s a pretty significant effect,” observed Dr. Ponikowski, professor of cardiology and head of the department of heart diseases at the Medical University of Wroclaw (Poland).
Moreover, a congestion symptoms score comprising a summary of orthopnea, jugular veinous distention, and edema improved by 47% after 12 weeks on empagliflozin, a statistically significant and clinically meaningful improvement that grew in magnitude over time and at 12 weeks was twice as large, compared with the reduction in placebo group, he added.
There was a trend for fewer unscheduled outpatient visits in the empagliflozin arm of EMPERIAL-Reduced with a rate of 10.4%, compared with 25.8% in controls; however, this 26% reduction in relative risk did not achieve statistical significance.
Intensification of loop diuretics occurred in 9% of EMPERIAL-Preserved participants on empagliflozin and 13.5% on placebo, but this 34% reduction in risk didn’t reach significance.
Adverse events in the EMPERIAL trials were similar across the active treatment and placebo arms. The benign safety profile was similar to what was seen in the earlier major clinical trials of empagliflozin for treatment of type 2 diabetes.
Session chair Stephane Heymans, MD, PhD, of the University of Maastricht (the Netherlands) noted that a substantial minority of patients in EMPERIAL-Reduced were on the combined neprilysin inhibitor sacubitril and the angiotensin receptor blocker valsartan (Entresto), whereas far fewer were in EMPERIAL-Preserved. He wondered if this greater use of background sacubitril/valsartan could explain empagliflozin’s greater efficacy in EMPERIAL-Reduced.
Highly unlikely, according to the investigators.
“It looks like, as is the case with most of our heart failure therapies, that we do see incremental value here. If you met the criteria for these trials, it appears you derived benefit from empagliflozin regardless of whether you were on an angiotensin receptor neprilysin inhibitor or not. I think that speaks to the incremental benefit of SGLT2 inhibitors on top of current guideline-directed medical therapy,” Dr. Abraham said.
Dr. Ponikowski observed that the same point was underscored in the DAPA-HF trial of the SGLT2 inhibitor dapagliflozin (Farxiga) in patients with heart failure (DAPA-HF: N Engl J Med. 2019 Nov 21;381[21]:1995-2008).
“You’ll see that the mortality and morbidity and quality-of-life benefit is in those treated with dapagliflozin with or without angiotensin receptor neprilysin inhibition; so, regardless of background therapy. And the effect is especially clear in patients on both therapies,” the cardiologist said.
The EMPERIAL trials were sponsored by Boehringer Ingelheim. Dr. Abraham and Dr. Ponikowksi reported receiving consultant fees from the company for serving on the trials’ executive committee.
FROM ESC HEART FAILURE 2020
Oral danicamtiv improves left atrial contractility in HFrEF
Danicamtiv, a novel oral selective cardiac myosin activator, demonstrated promising beneficial effects on left ventricular systolic function coupled with marked improvements in left atrial volume and function in patients with heart failure with reduced ejection fraction in a phase 2a clinical trial, Adriaan A. Voors, MD, PhD, said at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
Importantly, these improvements weren’t accompanied by any unwelcome significant increase in diastolic stiffness, added Dr. Voors, a cardiologist at the University of Groningen (the Netherlands).
This is a drug whose novel mechanism of action could make it a good fit in combination with existing guideline-recommended therapies known to improve morbidity and mortality in patients with heart failure with reduced ejection fraction (HFrEF), none of which do what danicamtiv does: namely, activates cardiac myosin by enhancing myofibrillar adenosine triphosphatase activity, thereby boosting intrinsic myocardial contractility without any impact upon calcium homeostasis, he explained.
Dr. Voors reported on 40 patients with stable HFrEF and a left ventricular ejection fraction of 35% or less, all on background guideline-directed medical therapy. They were randomized double blind to 7 days of danicamtiv at 50, 75, or 100 mg twice daily, or placebo. A total of 489 ECGs were performed in conjunction with blood draws to measure plasma drug concentrations during the study.
Danicamtiv significantly improved left ventricular stroke volume and global longitudinal and circumferential strain in plasma drug concentration–dependent fashion, while simultaneously decreasing left ventricular end-systolic and end-diastolic diameters. Danicamtiv increased systolic ejection time from 286 milliseconds at baseline by an additional placebo-corrected 15, 36, and 48 milliseconds in patients with low, mid-range, and high drug concentrations.
The cardiac myosin activator’s concentration-dependent salutary effects on left atrial (LA) parameters in this brief study were intriguing, since LA function is often compromised in patients with heart failure and has been shown in prior observational studies to independently predict cardiovascular outcomes, the cardiologist noted. The favorable changes in response to danicamtiv included a reduction in LA minimal volume index and an increase in LA emptying fraction. Also, there were marked improvements in LA function index, by 6.1 and 5.8 points, respectively, in patients with mid- and high drug concentrations, from a baseline of 26 points.
Holter monitoring revealed no increased risk of atrial or ventricular arrhythmias in study participants.
Treatment-emergent adverse events were mild and/or unrelated to treatment and showed no particular pattern. The one serious adverse event in the study was a case of hyperkalemia deemed by investigators to be unrelated to treatment.
Seven of 30 danicamtiv-treated patients developed mild, transient, asymptomatic increases in serum cardiac troponin I and/or high-sensitivity troponin T. Dr. Voors said the significance of this must await further examination in larger clinical trials. A phase 2 clinical trial in patients with HFrEF and paroxysmal or persistent atrial fibrillation is planned in order to learn if chronic therapy with danicamtiv results in sustained LA remodeling and clinical benefits. Another planned phase 2 study will be conducted in patients with selected forms of genetic dilated cardiomyopathy.
Because danicamtiv appears to have no effects on blood pressure, renal function, or electrolytes, Dr. Voors speculated that the drug might prove to be an attractive therapeutic option in patients with advanced refractory heart failure, who often have low blood pressure, poor renal function, and a very low left ventricular ejection fraction.
Discussant Thomas Thum, MD, PhD, commented that danicamtiv has definitely earned an opportunity to show what it can do in larger, long-term clinical trials. He was impressed by the significant increase in systolic ejection time, a good marker for cardiac contractility. But he added that the troponin signal warrants careful scrutiny.
“The slight increase over baseline in the phase 2a study was not correlated with any ECG changes or clinical symptoms. However, whether this is a detrimental biomarker sign of a silent harm to the heart remains to be investigated,” said Dr. Thum, a cardiologist at the Institute of Molecular and Translational Therapeutic Strategies at Hannover (Germany) Medical School.
The phase 2a study finding of a plasma drug concentration–dependent prolongation in isovolumetric relaxation time “warrants some caution in future clinical development in patients with impaired diastolic function,” he added.
Simultaneous with Dr. Voors’ presentation, the study results were published online (Eur J Heart Fail. 2020 Jun 19. doi: 10.1002/ejhf.1933).
The danicamtiv study was sponsored by MyoKardia. Dr. Voors reported receiving research funding from and serving as a consultant to MyoKardia and numerous other companies.
Danicamtiv, a novel oral selective cardiac myosin activator, demonstrated promising beneficial effects on left ventricular systolic function coupled with marked improvements in left atrial volume and function in patients with heart failure with reduced ejection fraction in a phase 2a clinical trial, Adriaan A. Voors, MD, PhD, said at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
Importantly, these improvements weren’t accompanied by any unwelcome significant increase in diastolic stiffness, added Dr. Voors, a cardiologist at the University of Groningen (the Netherlands).
This is a drug whose novel mechanism of action could make it a good fit in combination with existing guideline-recommended therapies known to improve morbidity and mortality in patients with heart failure with reduced ejection fraction (HFrEF), none of which do what danicamtiv does: namely, activates cardiac myosin by enhancing myofibrillar adenosine triphosphatase activity, thereby boosting intrinsic myocardial contractility without any impact upon calcium homeostasis, he explained.
Dr. Voors reported on 40 patients with stable HFrEF and a left ventricular ejection fraction of 35% or less, all on background guideline-directed medical therapy. They were randomized double blind to 7 days of danicamtiv at 50, 75, or 100 mg twice daily, or placebo. A total of 489 ECGs were performed in conjunction with blood draws to measure plasma drug concentrations during the study.
Danicamtiv significantly improved left ventricular stroke volume and global longitudinal and circumferential strain in plasma drug concentration–dependent fashion, while simultaneously decreasing left ventricular end-systolic and end-diastolic diameters. Danicamtiv increased systolic ejection time from 286 milliseconds at baseline by an additional placebo-corrected 15, 36, and 48 milliseconds in patients with low, mid-range, and high drug concentrations.
The cardiac myosin activator’s concentration-dependent salutary effects on left atrial (LA) parameters in this brief study were intriguing, since LA function is often compromised in patients with heart failure and has been shown in prior observational studies to independently predict cardiovascular outcomes, the cardiologist noted. The favorable changes in response to danicamtiv included a reduction in LA minimal volume index and an increase in LA emptying fraction. Also, there were marked improvements in LA function index, by 6.1 and 5.8 points, respectively, in patients with mid- and high drug concentrations, from a baseline of 26 points.
Holter monitoring revealed no increased risk of atrial or ventricular arrhythmias in study participants.
Treatment-emergent adverse events were mild and/or unrelated to treatment and showed no particular pattern. The one serious adverse event in the study was a case of hyperkalemia deemed by investigators to be unrelated to treatment.
Seven of 30 danicamtiv-treated patients developed mild, transient, asymptomatic increases in serum cardiac troponin I and/or high-sensitivity troponin T. Dr. Voors said the significance of this must await further examination in larger clinical trials. A phase 2 clinical trial in patients with HFrEF and paroxysmal or persistent atrial fibrillation is planned in order to learn if chronic therapy with danicamtiv results in sustained LA remodeling and clinical benefits. Another planned phase 2 study will be conducted in patients with selected forms of genetic dilated cardiomyopathy.
Because danicamtiv appears to have no effects on blood pressure, renal function, or electrolytes, Dr. Voors speculated that the drug might prove to be an attractive therapeutic option in patients with advanced refractory heart failure, who often have low blood pressure, poor renal function, and a very low left ventricular ejection fraction.
Discussant Thomas Thum, MD, PhD, commented that danicamtiv has definitely earned an opportunity to show what it can do in larger, long-term clinical trials. He was impressed by the significant increase in systolic ejection time, a good marker for cardiac contractility. But he added that the troponin signal warrants careful scrutiny.
“The slight increase over baseline in the phase 2a study was not correlated with any ECG changes or clinical symptoms. However, whether this is a detrimental biomarker sign of a silent harm to the heart remains to be investigated,” said Dr. Thum, a cardiologist at the Institute of Molecular and Translational Therapeutic Strategies at Hannover (Germany) Medical School.
The phase 2a study finding of a plasma drug concentration–dependent prolongation in isovolumetric relaxation time “warrants some caution in future clinical development in patients with impaired diastolic function,” he added.
Simultaneous with Dr. Voors’ presentation, the study results were published online (Eur J Heart Fail. 2020 Jun 19. doi: 10.1002/ejhf.1933).
The danicamtiv study was sponsored by MyoKardia. Dr. Voors reported receiving research funding from and serving as a consultant to MyoKardia and numerous other companies.
Danicamtiv, a novel oral selective cardiac myosin activator, demonstrated promising beneficial effects on left ventricular systolic function coupled with marked improvements in left atrial volume and function in patients with heart failure with reduced ejection fraction in a phase 2a clinical trial, Adriaan A. Voors, MD, PhD, said at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
Importantly, these improvements weren’t accompanied by any unwelcome significant increase in diastolic stiffness, added Dr. Voors, a cardiologist at the University of Groningen (the Netherlands).
This is a drug whose novel mechanism of action could make it a good fit in combination with existing guideline-recommended therapies known to improve morbidity and mortality in patients with heart failure with reduced ejection fraction (HFrEF), none of which do what danicamtiv does: namely, activates cardiac myosin by enhancing myofibrillar adenosine triphosphatase activity, thereby boosting intrinsic myocardial contractility without any impact upon calcium homeostasis, he explained.
Dr. Voors reported on 40 patients with stable HFrEF and a left ventricular ejection fraction of 35% or less, all on background guideline-directed medical therapy. They were randomized double blind to 7 days of danicamtiv at 50, 75, or 100 mg twice daily, or placebo. A total of 489 ECGs were performed in conjunction with blood draws to measure plasma drug concentrations during the study.
Danicamtiv significantly improved left ventricular stroke volume and global longitudinal and circumferential strain in plasma drug concentration–dependent fashion, while simultaneously decreasing left ventricular end-systolic and end-diastolic diameters. Danicamtiv increased systolic ejection time from 286 milliseconds at baseline by an additional placebo-corrected 15, 36, and 48 milliseconds in patients with low, mid-range, and high drug concentrations.
The cardiac myosin activator’s concentration-dependent salutary effects on left atrial (LA) parameters in this brief study were intriguing, since LA function is often compromised in patients with heart failure and has been shown in prior observational studies to independently predict cardiovascular outcomes, the cardiologist noted. The favorable changes in response to danicamtiv included a reduction in LA minimal volume index and an increase in LA emptying fraction. Also, there were marked improvements in LA function index, by 6.1 and 5.8 points, respectively, in patients with mid- and high drug concentrations, from a baseline of 26 points.
Holter monitoring revealed no increased risk of atrial or ventricular arrhythmias in study participants.
Treatment-emergent adverse events were mild and/or unrelated to treatment and showed no particular pattern. The one serious adverse event in the study was a case of hyperkalemia deemed by investigators to be unrelated to treatment.
Seven of 30 danicamtiv-treated patients developed mild, transient, asymptomatic increases in serum cardiac troponin I and/or high-sensitivity troponin T. Dr. Voors said the significance of this must await further examination in larger clinical trials. A phase 2 clinical trial in patients with HFrEF and paroxysmal or persistent atrial fibrillation is planned in order to learn if chronic therapy with danicamtiv results in sustained LA remodeling and clinical benefits. Another planned phase 2 study will be conducted in patients with selected forms of genetic dilated cardiomyopathy.
Because danicamtiv appears to have no effects on blood pressure, renal function, or electrolytes, Dr. Voors speculated that the drug might prove to be an attractive therapeutic option in patients with advanced refractory heart failure, who often have low blood pressure, poor renal function, and a very low left ventricular ejection fraction.
Discussant Thomas Thum, MD, PhD, commented that danicamtiv has definitely earned an opportunity to show what it can do in larger, long-term clinical trials. He was impressed by the significant increase in systolic ejection time, a good marker for cardiac contractility. But he added that the troponin signal warrants careful scrutiny.
“The slight increase over baseline in the phase 2a study was not correlated with any ECG changes or clinical symptoms. However, whether this is a detrimental biomarker sign of a silent harm to the heart remains to be investigated,” said Dr. Thum, a cardiologist at the Institute of Molecular and Translational Therapeutic Strategies at Hannover (Germany) Medical School.
The phase 2a study finding of a plasma drug concentration–dependent prolongation in isovolumetric relaxation time “warrants some caution in future clinical development in patients with impaired diastolic function,” he added.
Simultaneous with Dr. Voors’ presentation, the study results were published online (Eur J Heart Fail. 2020 Jun 19. doi: 10.1002/ejhf.1933).
The danicamtiv study was sponsored by MyoKardia. Dr. Voors reported receiving research funding from and serving as a consultant to MyoKardia and numerous other companies.
FROM ESC HEART FAILURE 2020
Dapagliflozin benefits low-EF heart failure regardless of diuretic dose: DAPA-HF
The DAPA-HF trial has already changed cardiology in opening up a new class of drugs to patients with heart failure (HF), whether or not they have diabetes. Now the trial is yielding clues as to how it benefits them. For now, it’s doing so by process of elimination.
A new analysis suggests that dapagliflozin (Farxiga, AstraZeneca) didn’t need help from loop diuretics to cut the risk for clinical events in patients with HF with reduced ejection fraction (HFrEF), a benefit seen across the spectrum of glycosylated hemoglobin levels and without compromising renal function, said DAPA-HF investigators. Also, use of dapagliflozin and its clinical effects were not associated with changes in loop diuretic dosage. Those findings and others suggest the drug helps in HFrEF at least partly by some other mechanism than its own diuretic effect, the researchers say.
Such insights will likely be important to case-by-case decisions on whether to use the drug, a sodium-glucose cotransporter 2 (SGLT2) inhibitor once reserved for patients with diabetes, given the recently broader landscape of HF treatment options.
As previously reported from DAPA-HF, with more than 4,700 patients, those who received dapagliflozin showed significant reductions in the primary end point, a composite of cardiovascular (CV) death, HF hospitalization, and urgent HF visit requiring IV therapy over about 18 months. The 45% of patients with and 55% without type 2 diabetes enjoyed about equal benefit in the placebo-controlled trial for that end point, as well as for all-cause mortality.
SGLT2 inhibitors work in diabetes by promoting urinary glucose excretion. That had led some to speculate that its benefit in HFrEF comes primarily from a diuretic effect; the current findings largely put that question to rest.
“Our findings show that treatment with dapagliflozin was effective regardless of diuretic use or diuretic dose. They also show that dapagliflozin did not lead to an increase in renal adverse events or discontinuation of therapy in patients treated with a diuretic,” trialist Alice M. Jackson, MB, ChB, said in an interview.
“In fact, renal adverse events were generally less common in patients treated with dapagliflozin, across the diuretic categories,” said Dr. Jackson, from the University of Glasgow.
Dr. Jackson presented the new analysis at a Late-Breaking Science Session during the European Society of Cardiology Heart Failure Discoveries virtual meeting. The HFA sessions were conducted virtually this year due to the COVID-19 pandemic.
At baseline, 84% of patients were on conventional diuretics. The post hoc analysis broke out all patients by loop-diuretic dosage level: none; less than 40 mg furosemide equivalents (FE); 40 mg FE; or more than 40 mg FE. Clinical outcomes were similar across the four groups.
Clinicians in the trial “were not given specific advice about adjusting diuretic doses, but were encouraged to assess volume status and make changes to medical therapy based on this, if necessary,” Dr. Jackson said. “This suggests that, for most patients, starting dapagliflozin will not necessitate a change in diuretic dose.”
With the caveat that the event rate was low in the relatively few patients not prescribed loop diuretics, she said, “the magnitude of the benefit from dapagliflozin appeared to be larger in patients not treated with a diuretic.”
There was no suggestion of a diuretic dose–response effect or statistical interaction between diuretic use and clinical outcomes on dapagliflozin, Dr. Jackson observed in the interview.
Of note in the analysis, hematocrit levels shot up soon after patients started active therapy, but they didn’t rise much in the placebo group. The sustained hematocrit elevation on dapagliflozin, seen at all diuretic dosage levels, persisted even after dosage reductions at 6 months, she said.
“Dapagliflozin is effective in HFrEF irrespective of background diuretic therapy; therefore, it is almost certainly not purely acting as a diuretic,” Andrew J. Coats, MD, DSc, MBA, said in an interview.
The findings also “lessen the concern that dapagliflozin’s beneficial effects are only seen only in patients without effective diuretic dosing,” said Dr. Coats, from University of Warwick, Coventry, England.
“Altogether, these data give further reassurance that dapagliflozin can safely be used in heart failure, and has a beneficial effect independent of the use of diuretic drugs,” invited discussant Wolfram Doehner, MD, PhD, Charité-Universitätsmedizin Berlin, said after Dr. Jackson’s presentation of the analysis.
He made special mention of the sustained hematocrit elevation on dapagliflozin. “While this effect may likely relate to the mild reduction in plasma volume secondary to dapagliflozin therapy, it is noted that the increase in hematocrit was independent of any change of the diuretic dose,” Doehner said. “If additional mechanisms have a role for this observed increase in hematocrit, it may be of interest in further investigations.”
Dr. Jackson pointed to several observations that suggest the hematocrit finding isn’t explained by hemoconcentration from reduced plasma volume, at least not entirely.
For example, hematocrit levels rose “without any suggestion of a relationship between diuretic dose and degree of hematocrit elevation with dapagliflozin,” she said.
The elevations persisted even with diuretic dose reductions at 6 and 12 months, “which should have led to a decrease in hemoconcentration if it was caused by volume contraction.”
Also, she said, “among patients not taking a diuretic, volume depletion occurred less frequently in the dapagliflozin group than in the placebo group, but there was still a similar rise in hematocrit with dapagliflozin.”
Both Dr. Jackson and Dr. Coats said the sustained elevation in hematocrit on the drug is unlikely to pose a major hazard.
Dr. Coats said that, theoretically, “increased hematocrit could reduce peripheral vessel blood flow, making ischemia and thrombosis more likely. But the size of the effect is small and unlikely to be clinically important.”
A diuretic dose could not be determined for 128 of the trial’s 4,744 randomized patients with HFrEF, so the post hoc analysis was limited to the remaining 4,616. Of those, 746 were not on diuretics at baseline, 1,311 were on loop diuretics at less than 40 mg FE or on non-loop diuretics only, 1,365 were taking 40 mg FE, and 1,204 were on higher doses of loop diuretics.
The mean baseline dosage was 60 mg FE, which rose slightly throughout the trial. But the baseline dosage and the increases were both similar in the placebo and dapagliflozin groups. Dr. Jackson said 84% and 83% of patients on dapagliflozin and placebo, respectively, maintained their baseline dose at 6 months and about 77% in both groups at 12 months.
The overall trial’s significant primary endpoint reduction for dapagliflozin versus placebo applied similarly to patients not on a diuretics and to those on any dose of diuretic, with an interaction P value of .23 for the effect of diuretic use. The hazard ratios (95% confidence interval) were 0.57 (0.36-0.92) for patients not on diuretics, 0.78 (0.68-0.90) for patients on any diuretic dosage, and 0.74 (0.65-0.85) overall
Dr. Jackson said during her formal online presentation that patients on diuretics showed a “tendency toward slightly more volume depletion in those on dapagliflozin than in those on placebo, but the excess was small and not greater than approximately 3% in those taking 40 mg furosemide equivalent diuretic. And fortunately, this did not result in an increase in frequency in renal adverse events nor of discontinuation of study drug.”
Renal adverse events were similarly prevalent in the two treatment groups, as were such events leading to treatment discontinuation. But serious renal events were less common in the dapagliflozin group (1.6% vs 2.7%; P = .009), as was investigator-reported serious acute kidney injury (1.0% vs 1.9%; P = .007).
“Overall, renal events were infrequent,” Dr. Jackson said, and “because of the small number of events, it is very difficult to draw conclusions about the impact of dapagliflozin on renal function according to diuretic-dose subgroups.”
Still, she said, worsening renal function was less common on dapagliflozin in three of the four groups by diuretic dosage; the exception was the less than 40 mg FE group, “but the absolute difference in this group was only two events.”
There seem to be dapagliflozin mechanisms “underneath the surface that need to be unraveled,” Dr. Doehner said as discussant, processes that are favorable for the treatment of HFrEF in which “diuretics play no big role.”
Dr. Jackson has no disclosures. Dr. Coats has disclosed receiving personal fees from Actimed, AstraZeneca, Faraday, WL Gore, Menarini, Novartis, Nutricia, Respicardia, Servier, Stealth Peptides, Verona, and Vifor. Dr. Doener has recently disclosed receiving grants and personal fees from Vifor, Pfizer, Boehringer Ingelheim, Sphingotec, ZS Pharma, Bayer, and Medtronic.
A version of this article originally appeared on Medscape.com.
The DAPA-HF trial has already changed cardiology in opening up a new class of drugs to patients with heart failure (HF), whether or not they have diabetes. Now the trial is yielding clues as to how it benefits them. For now, it’s doing so by process of elimination.
A new analysis suggests that dapagliflozin (Farxiga, AstraZeneca) didn’t need help from loop diuretics to cut the risk for clinical events in patients with HF with reduced ejection fraction (HFrEF), a benefit seen across the spectrum of glycosylated hemoglobin levels and without compromising renal function, said DAPA-HF investigators. Also, use of dapagliflozin and its clinical effects were not associated with changes in loop diuretic dosage. Those findings and others suggest the drug helps in HFrEF at least partly by some other mechanism than its own diuretic effect, the researchers say.
Such insights will likely be important to case-by-case decisions on whether to use the drug, a sodium-glucose cotransporter 2 (SGLT2) inhibitor once reserved for patients with diabetes, given the recently broader landscape of HF treatment options.
As previously reported from DAPA-HF, with more than 4,700 patients, those who received dapagliflozin showed significant reductions in the primary end point, a composite of cardiovascular (CV) death, HF hospitalization, and urgent HF visit requiring IV therapy over about 18 months. The 45% of patients with and 55% without type 2 diabetes enjoyed about equal benefit in the placebo-controlled trial for that end point, as well as for all-cause mortality.
SGLT2 inhibitors work in diabetes by promoting urinary glucose excretion. That had led some to speculate that its benefit in HFrEF comes primarily from a diuretic effect; the current findings largely put that question to rest.
“Our findings show that treatment with dapagliflozin was effective regardless of diuretic use or diuretic dose. They also show that dapagliflozin did not lead to an increase in renal adverse events or discontinuation of therapy in patients treated with a diuretic,” trialist Alice M. Jackson, MB, ChB, said in an interview.
“In fact, renal adverse events were generally less common in patients treated with dapagliflozin, across the diuretic categories,” said Dr. Jackson, from the University of Glasgow.
Dr. Jackson presented the new analysis at a Late-Breaking Science Session during the European Society of Cardiology Heart Failure Discoveries virtual meeting. The HFA sessions were conducted virtually this year due to the COVID-19 pandemic.
At baseline, 84% of patients were on conventional diuretics. The post hoc analysis broke out all patients by loop-diuretic dosage level: none; less than 40 mg furosemide equivalents (FE); 40 mg FE; or more than 40 mg FE. Clinical outcomes were similar across the four groups.
Clinicians in the trial “were not given specific advice about adjusting diuretic doses, but were encouraged to assess volume status and make changes to medical therapy based on this, if necessary,” Dr. Jackson said. “This suggests that, for most patients, starting dapagliflozin will not necessitate a change in diuretic dose.”
With the caveat that the event rate was low in the relatively few patients not prescribed loop diuretics, she said, “the magnitude of the benefit from dapagliflozin appeared to be larger in patients not treated with a diuretic.”
There was no suggestion of a diuretic dose–response effect or statistical interaction between diuretic use and clinical outcomes on dapagliflozin, Dr. Jackson observed in the interview.
Of note in the analysis, hematocrit levels shot up soon after patients started active therapy, but they didn’t rise much in the placebo group. The sustained hematocrit elevation on dapagliflozin, seen at all diuretic dosage levels, persisted even after dosage reductions at 6 months, she said.
“Dapagliflozin is effective in HFrEF irrespective of background diuretic therapy; therefore, it is almost certainly not purely acting as a diuretic,” Andrew J. Coats, MD, DSc, MBA, said in an interview.
The findings also “lessen the concern that dapagliflozin’s beneficial effects are only seen only in patients without effective diuretic dosing,” said Dr. Coats, from University of Warwick, Coventry, England.
“Altogether, these data give further reassurance that dapagliflozin can safely be used in heart failure, and has a beneficial effect independent of the use of diuretic drugs,” invited discussant Wolfram Doehner, MD, PhD, Charité-Universitätsmedizin Berlin, said after Dr. Jackson’s presentation of the analysis.
He made special mention of the sustained hematocrit elevation on dapagliflozin. “While this effect may likely relate to the mild reduction in plasma volume secondary to dapagliflozin therapy, it is noted that the increase in hematocrit was independent of any change of the diuretic dose,” Doehner said. “If additional mechanisms have a role for this observed increase in hematocrit, it may be of interest in further investigations.”
Dr. Jackson pointed to several observations that suggest the hematocrit finding isn’t explained by hemoconcentration from reduced plasma volume, at least not entirely.
For example, hematocrit levels rose “without any suggestion of a relationship between diuretic dose and degree of hematocrit elevation with dapagliflozin,” she said.
The elevations persisted even with diuretic dose reductions at 6 and 12 months, “which should have led to a decrease in hemoconcentration if it was caused by volume contraction.”
Also, she said, “among patients not taking a diuretic, volume depletion occurred less frequently in the dapagliflozin group than in the placebo group, but there was still a similar rise in hematocrit with dapagliflozin.”
Both Dr. Jackson and Dr. Coats said the sustained elevation in hematocrit on the drug is unlikely to pose a major hazard.
Dr. Coats said that, theoretically, “increased hematocrit could reduce peripheral vessel blood flow, making ischemia and thrombosis more likely. But the size of the effect is small and unlikely to be clinically important.”
A diuretic dose could not be determined for 128 of the trial’s 4,744 randomized patients with HFrEF, so the post hoc analysis was limited to the remaining 4,616. Of those, 746 were not on diuretics at baseline, 1,311 were on loop diuretics at less than 40 mg FE or on non-loop diuretics only, 1,365 were taking 40 mg FE, and 1,204 were on higher doses of loop diuretics.
The mean baseline dosage was 60 mg FE, which rose slightly throughout the trial. But the baseline dosage and the increases were both similar in the placebo and dapagliflozin groups. Dr. Jackson said 84% and 83% of patients on dapagliflozin and placebo, respectively, maintained their baseline dose at 6 months and about 77% in both groups at 12 months.
The overall trial’s significant primary endpoint reduction for dapagliflozin versus placebo applied similarly to patients not on a diuretics and to those on any dose of diuretic, with an interaction P value of .23 for the effect of diuretic use. The hazard ratios (95% confidence interval) were 0.57 (0.36-0.92) for patients not on diuretics, 0.78 (0.68-0.90) for patients on any diuretic dosage, and 0.74 (0.65-0.85) overall
Dr. Jackson said during her formal online presentation that patients on diuretics showed a “tendency toward slightly more volume depletion in those on dapagliflozin than in those on placebo, but the excess was small and not greater than approximately 3% in those taking 40 mg furosemide equivalent diuretic. And fortunately, this did not result in an increase in frequency in renal adverse events nor of discontinuation of study drug.”
Renal adverse events were similarly prevalent in the two treatment groups, as were such events leading to treatment discontinuation. But serious renal events were less common in the dapagliflozin group (1.6% vs 2.7%; P = .009), as was investigator-reported serious acute kidney injury (1.0% vs 1.9%; P = .007).
“Overall, renal events were infrequent,” Dr. Jackson said, and “because of the small number of events, it is very difficult to draw conclusions about the impact of dapagliflozin on renal function according to diuretic-dose subgroups.”
Still, she said, worsening renal function was less common on dapagliflozin in three of the four groups by diuretic dosage; the exception was the less than 40 mg FE group, “but the absolute difference in this group was only two events.”
There seem to be dapagliflozin mechanisms “underneath the surface that need to be unraveled,” Dr. Doehner said as discussant, processes that are favorable for the treatment of HFrEF in which “diuretics play no big role.”
Dr. Jackson has no disclosures. Dr. Coats has disclosed receiving personal fees from Actimed, AstraZeneca, Faraday, WL Gore, Menarini, Novartis, Nutricia, Respicardia, Servier, Stealth Peptides, Verona, and Vifor. Dr. Doener has recently disclosed receiving grants and personal fees from Vifor, Pfizer, Boehringer Ingelheim, Sphingotec, ZS Pharma, Bayer, and Medtronic.
A version of this article originally appeared on Medscape.com.
The DAPA-HF trial has already changed cardiology in opening up a new class of drugs to patients with heart failure (HF), whether or not they have diabetes. Now the trial is yielding clues as to how it benefits them. For now, it’s doing so by process of elimination.
A new analysis suggests that dapagliflozin (Farxiga, AstraZeneca) didn’t need help from loop diuretics to cut the risk for clinical events in patients with HF with reduced ejection fraction (HFrEF), a benefit seen across the spectrum of glycosylated hemoglobin levels and without compromising renal function, said DAPA-HF investigators. Also, use of dapagliflozin and its clinical effects were not associated with changes in loop diuretic dosage. Those findings and others suggest the drug helps in HFrEF at least partly by some other mechanism than its own diuretic effect, the researchers say.
Such insights will likely be important to case-by-case decisions on whether to use the drug, a sodium-glucose cotransporter 2 (SGLT2) inhibitor once reserved for patients with diabetes, given the recently broader landscape of HF treatment options.
As previously reported from DAPA-HF, with more than 4,700 patients, those who received dapagliflozin showed significant reductions in the primary end point, a composite of cardiovascular (CV) death, HF hospitalization, and urgent HF visit requiring IV therapy over about 18 months. The 45% of patients with and 55% without type 2 diabetes enjoyed about equal benefit in the placebo-controlled trial for that end point, as well as for all-cause mortality.
SGLT2 inhibitors work in diabetes by promoting urinary glucose excretion. That had led some to speculate that its benefit in HFrEF comes primarily from a diuretic effect; the current findings largely put that question to rest.
“Our findings show that treatment with dapagliflozin was effective regardless of diuretic use or diuretic dose. They also show that dapagliflozin did not lead to an increase in renal adverse events or discontinuation of therapy in patients treated with a diuretic,” trialist Alice M. Jackson, MB, ChB, said in an interview.
“In fact, renal adverse events were generally less common in patients treated with dapagliflozin, across the diuretic categories,” said Dr. Jackson, from the University of Glasgow.
Dr. Jackson presented the new analysis at a Late-Breaking Science Session during the European Society of Cardiology Heart Failure Discoveries virtual meeting. The HFA sessions were conducted virtually this year due to the COVID-19 pandemic.
At baseline, 84% of patients were on conventional diuretics. The post hoc analysis broke out all patients by loop-diuretic dosage level: none; less than 40 mg furosemide equivalents (FE); 40 mg FE; or more than 40 mg FE. Clinical outcomes were similar across the four groups.
Clinicians in the trial “were not given specific advice about adjusting diuretic doses, but were encouraged to assess volume status and make changes to medical therapy based on this, if necessary,” Dr. Jackson said. “This suggests that, for most patients, starting dapagliflozin will not necessitate a change in diuretic dose.”
With the caveat that the event rate was low in the relatively few patients not prescribed loop diuretics, she said, “the magnitude of the benefit from dapagliflozin appeared to be larger in patients not treated with a diuretic.”
There was no suggestion of a diuretic dose–response effect or statistical interaction between diuretic use and clinical outcomes on dapagliflozin, Dr. Jackson observed in the interview.
Of note in the analysis, hematocrit levels shot up soon after patients started active therapy, but they didn’t rise much in the placebo group. The sustained hematocrit elevation on dapagliflozin, seen at all diuretic dosage levels, persisted even after dosage reductions at 6 months, she said.
“Dapagliflozin is effective in HFrEF irrespective of background diuretic therapy; therefore, it is almost certainly not purely acting as a diuretic,” Andrew J. Coats, MD, DSc, MBA, said in an interview.
The findings also “lessen the concern that dapagliflozin’s beneficial effects are only seen only in patients without effective diuretic dosing,” said Dr. Coats, from University of Warwick, Coventry, England.
“Altogether, these data give further reassurance that dapagliflozin can safely be used in heart failure, and has a beneficial effect independent of the use of diuretic drugs,” invited discussant Wolfram Doehner, MD, PhD, Charité-Universitätsmedizin Berlin, said after Dr. Jackson’s presentation of the analysis.
He made special mention of the sustained hematocrit elevation on dapagliflozin. “While this effect may likely relate to the mild reduction in plasma volume secondary to dapagliflozin therapy, it is noted that the increase in hematocrit was independent of any change of the diuretic dose,” Doehner said. “If additional mechanisms have a role for this observed increase in hematocrit, it may be of interest in further investigations.”
Dr. Jackson pointed to several observations that suggest the hematocrit finding isn’t explained by hemoconcentration from reduced plasma volume, at least not entirely.
For example, hematocrit levels rose “without any suggestion of a relationship between diuretic dose and degree of hematocrit elevation with dapagliflozin,” she said.
The elevations persisted even with diuretic dose reductions at 6 and 12 months, “which should have led to a decrease in hemoconcentration if it was caused by volume contraction.”
Also, she said, “among patients not taking a diuretic, volume depletion occurred less frequently in the dapagliflozin group than in the placebo group, but there was still a similar rise in hematocrit with dapagliflozin.”
Both Dr. Jackson and Dr. Coats said the sustained elevation in hematocrit on the drug is unlikely to pose a major hazard.
Dr. Coats said that, theoretically, “increased hematocrit could reduce peripheral vessel blood flow, making ischemia and thrombosis more likely. But the size of the effect is small and unlikely to be clinically important.”
A diuretic dose could not be determined for 128 of the trial’s 4,744 randomized patients with HFrEF, so the post hoc analysis was limited to the remaining 4,616. Of those, 746 were not on diuretics at baseline, 1,311 were on loop diuretics at less than 40 mg FE or on non-loop diuretics only, 1,365 were taking 40 mg FE, and 1,204 were on higher doses of loop diuretics.
The mean baseline dosage was 60 mg FE, which rose slightly throughout the trial. But the baseline dosage and the increases were both similar in the placebo and dapagliflozin groups. Dr. Jackson said 84% and 83% of patients on dapagliflozin and placebo, respectively, maintained their baseline dose at 6 months and about 77% in both groups at 12 months.
The overall trial’s significant primary endpoint reduction for dapagliflozin versus placebo applied similarly to patients not on a diuretics and to those on any dose of diuretic, with an interaction P value of .23 for the effect of diuretic use. The hazard ratios (95% confidence interval) were 0.57 (0.36-0.92) for patients not on diuretics, 0.78 (0.68-0.90) for patients on any diuretic dosage, and 0.74 (0.65-0.85) overall
Dr. Jackson said during her formal online presentation that patients on diuretics showed a “tendency toward slightly more volume depletion in those on dapagliflozin than in those on placebo, but the excess was small and not greater than approximately 3% in those taking 40 mg furosemide equivalent diuretic. And fortunately, this did not result in an increase in frequency in renal adverse events nor of discontinuation of study drug.”
Renal adverse events were similarly prevalent in the two treatment groups, as were such events leading to treatment discontinuation. But serious renal events were less common in the dapagliflozin group (1.6% vs 2.7%; P = .009), as was investigator-reported serious acute kidney injury (1.0% vs 1.9%; P = .007).
“Overall, renal events were infrequent,” Dr. Jackson said, and “because of the small number of events, it is very difficult to draw conclusions about the impact of dapagliflozin on renal function according to diuretic-dose subgroups.”
Still, she said, worsening renal function was less common on dapagliflozin in three of the four groups by diuretic dosage; the exception was the less than 40 mg FE group, “but the absolute difference in this group was only two events.”
There seem to be dapagliflozin mechanisms “underneath the surface that need to be unraveled,” Dr. Doehner said as discussant, processes that are favorable for the treatment of HFrEF in which “diuretics play no big role.”
Dr. Jackson has no disclosures. Dr. Coats has disclosed receiving personal fees from Actimed, AstraZeneca, Faraday, WL Gore, Menarini, Novartis, Nutricia, Respicardia, Servier, Stealth Peptides, Verona, and Vifor. Dr. Doener has recently disclosed receiving grants and personal fees from Vifor, Pfizer, Boehringer Ingelheim, Sphingotec, ZS Pharma, Bayer, and Medtronic.
A version of this article originally appeared on Medscape.com.
FROM ESC HEART FAILURE 2020
Women thrive on baroreflex activation for heart failure
The striking gains in functional capacity and quality of life conferred by baroreflex activation therapy in patients with heart failure, as shown in the pivotal phase 3 clinical trial for this novel intervention, were at least as great in women as in men, JoAnn Lindenfeld, MD, said at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
The results of the multicenter, prospective, randomized BeAT-HF trial led to marketing approval of the BaroStim Neo system for improvement in symptoms of heart failure with reduced ejection fraction (HFrEF) by the Food and Drug Administration in August 2019. Dr. Lindenfeld presented a fresh breakdown of the results by gender which showed, intriguingly, that the improvement in all study endpoints was consistently numerically greater in the women – sometimes startlingly so – although these gender differences in response didn’t achieve statistical significance. The 6-month randomized trial was underpowered for drawing definitive conclusions on that score, with a study population of only 53 women and 211 men. So the investigator remained circumspect.
“We think that what this study shows us is that women have at least equivalent improvement as men in this population. I don’t think we can conclude from this study yet that it’s better, but it’s certainly in all these parameters as least as good. And I think this is a population in which we’ve seen that improving symptoms and functional capacity is very important,” said Dr. Lindenfeld, professor of medicine and director of advanced heart failure/cardiac transplantation at Vanderbilt University, Nashville, Tenn.
The FDA approval was restricted to patients like those enrolled in BeAT-HF: that is, individuals with New York Heart Association functional class III heart failure, a left ventricular ejection fraction of 35% or less while on stable optimal medical therapy, and ineligibility for cardiac resynchronization therapy according to current guidelines. Seventy-eight percent of BeAT-HF participants had an implantable cardioverter-defibrillator.
Participants were randomized to baroreflex activation therapy (BAT) plus optimal medical therapy or to optimal medical therapy alone. The three coprimary endpoints were change from baseline to 6 months in 6-minute hall walk distance (6MHW), scores on the Minnesota Living with Heart Failure Questionnaire (MLHF), and N-terminal pro-B-type natriuretic peptide (NT-proBNP).
In the overall study population, 6MHW increased by 60 m in the BAT group and decreased by 8 m in controls; MLHF scores dropped by 14 and 6 points, respectively; and NT-proBNP fell by an average of 25% with BAT while rising by 3% in controls.
Very often, just a 5-point reduction in MLHF score is considered a clinically meaningful improvement in quality of life, the cardiologist noted.
The gender-based analysis is where things got particularly interesting.
The investigators defined a clinically relevant response as a greater than 10% increase from baseline on the 6MHW, at least a one-class improvement in NYHA class, or a reduction of 5 points or more on the MLHF. Among subjects in the BAT group, 70% of women and 60% of men met the clinically relevant response standard in terms of 6MHW, as did 70% of women and 64% of men for improvement in NYHA class, and 78% of women and 66% of men for MLHF score.
Eighty-seven percent of women and 68% of men on BAT had a clinically relevant response on at least one of these endpoints, as did about 28% of controls. Moreover, 31% of women in the BAT group were clinically relevant responders on at least two endpoints, compared with 19% of BAT men and 4% and 9% of controls.
Women dominate super-responder category
In order to be classified as a super responder, a patient had to demonstrate a greater than 20% increase in 6MHW, improvement in NYHA class I status, or at least a 10-point improvement in MLHF score. Ninety-one percent of women on BAT achieved super-responder status for at least one of these endpoints, compared with 76% of men. Forty-three percent of women and 24% of men in the BAT group were super responders in at least two domains, as were 8% and 11% of female and male controls, Dr. Lindenfeld continued.
Discussant Ewa Anita Jankowska, MD, PhD, deemed the BeAT-HF results on the therapeutic benefits of this autonomic modulation strategy “quite convincing.”
“We need to acknowledge that in recent years we have been spoiled a bit by the huge trials in heart failure where the ultimate goal was a reduction in mortality. But I think this is the time when we should think about the patients who want to live – here, now – with a better life. Patients expect symptomatic benefits. There is a substantial group of patients who are symptomatic even though they receive quite extensive neurohormonal blockage and who are not suitable for CRT. This study demonstrates that, for this group of patients, BAT can bring really significant symptomatic benefits,” she said.
“If you think about a treatment that provides patients who are NYHA class III an increase in 6MHW of 60 meters, that’s really something. And 20% of patients went from NYHA class III to class I – that’s really something, too,” added Dr. Jankowska, professor of medicine and head of the laboratory of applied research on the cardiovascular system at Wroclaw (Poland) University.
How baroreflex activation therapy works
The BaroStim system consists of a 2-mm unipolar electrode on a 7-mm backer that is placed over the carotid sinus. It is supported by a small generator with a 4- to 5-year battery life implanted under the collarbone, along with radiofrequency telemetry capability and programming flexibility.
Stimulation of the carotid baroreceptor promotes an integrated autonomic nervous system response which enhances parasympathetic activity and inhibits sympathetic nervous system activity. The result, as shown in numerous earlier proof-of-concept studies, is a reduced heart rate, decreased ventricular remodeling, enhanced diuresis, increased vasodilation, a drop in elevated blood pressure, and decreased renin secretion – all achieved nonpharmacologically.
The study was sponsored by CVRx. Dr. Lindenfeld reported serving as a consultant to CVRx, Abbott, AstraZeneca, Boehringer Ingelheim, Edwards Lifesciences, Impulse Dynamics, and VWave.
The striking gains in functional capacity and quality of life conferred by baroreflex activation therapy in patients with heart failure, as shown in the pivotal phase 3 clinical trial for this novel intervention, were at least as great in women as in men, JoAnn Lindenfeld, MD, said at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
The results of the multicenter, prospective, randomized BeAT-HF trial led to marketing approval of the BaroStim Neo system for improvement in symptoms of heart failure with reduced ejection fraction (HFrEF) by the Food and Drug Administration in August 2019. Dr. Lindenfeld presented a fresh breakdown of the results by gender which showed, intriguingly, that the improvement in all study endpoints was consistently numerically greater in the women – sometimes startlingly so – although these gender differences in response didn’t achieve statistical significance. The 6-month randomized trial was underpowered for drawing definitive conclusions on that score, with a study population of only 53 women and 211 men. So the investigator remained circumspect.
“We think that what this study shows us is that women have at least equivalent improvement as men in this population. I don’t think we can conclude from this study yet that it’s better, but it’s certainly in all these parameters as least as good. And I think this is a population in which we’ve seen that improving symptoms and functional capacity is very important,” said Dr. Lindenfeld, professor of medicine and director of advanced heart failure/cardiac transplantation at Vanderbilt University, Nashville, Tenn.
The FDA approval was restricted to patients like those enrolled in BeAT-HF: that is, individuals with New York Heart Association functional class III heart failure, a left ventricular ejection fraction of 35% or less while on stable optimal medical therapy, and ineligibility for cardiac resynchronization therapy according to current guidelines. Seventy-eight percent of BeAT-HF participants had an implantable cardioverter-defibrillator.
Participants were randomized to baroreflex activation therapy (BAT) plus optimal medical therapy or to optimal medical therapy alone. The three coprimary endpoints were change from baseline to 6 months in 6-minute hall walk distance (6MHW), scores on the Minnesota Living with Heart Failure Questionnaire (MLHF), and N-terminal pro-B-type natriuretic peptide (NT-proBNP).
In the overall study population, 6MHW increased by 60 m in the BAT group and decreased by 8 m in controls; MLHF scores dropped by 14 and 6 points, respectively; and NT-proBNP fell by an average of 25% with BAT while rising by 3% in controls.
Very often, just a 5-point reduction in MLHF score is considered a clinically meaningful improvement in quality of life, the cardiologist noted.
The gender-based analysis is where things got particularly interesting.
The investigators defined a clinically relevant response as a greater than 10% increase from baseline on the 6MHW, at least a one-class improvement in NYHA class, or a reduction of 5 points or more on the MLHF. Among subjects in the BAT group, 70% of women and 60% of men met the clinically relevant response standard in terms of 6MHW, as did 70% of women and 64% of men for improvement in NYHA class, and 78% of women and 66% of men for MLHF score.
Eighty-seven percent of women and 68% of men on BAT had a clinically relevant response on at least one of these endpoints, as did about 28% of controls. Moreover, 31% of women in the BAT group were clinically relevant responders on at least two endpoints, compared with 19% of BAT men and 4% and 9% of controls.
Women dominate super-responder category
In order to be classified as a super responder, a patient had to demonstrate a greater than 20% increase in 6MHW, improvement in NYHA class I status, or at least a 10-point improvement in MLHF score. Ninety-one percent of women on BAT achieved super-responder status for at least one of these endpoints, compared with 76% of men. Forty-three percent of women and 24% of men in the BAT group were super responders in at least two domains, as were 8% and 11% of female and male controls, Dr. Lindenfeld continued.
Discussant Ewa Anita Jankowska, MD, PhD, deemed the BeAT-HF results on the therapeutic benefits of this autonomic modulation strategy “quite convincing.”
“We need to acknowledge that in recent years we have been spoiled a bit by the huge trials in heart failure where the ultimate goal was a reduction in mortality. But I think this is the time when we should think about the patients who want to live – here, now – with a better life. Patients expect symptomatic benefits. There is a substantial group of patients who are symptomatic even though they receive quite extensive neurohormonal blockage and who are not suitable for CRT. This study demonstrates that, for this group of patients, BAT can bring really significant symptomatic benefits,” she said.
“If you think about a treatment that provides patients who are NYHA class III an increase in 6MHW of 60 meters, that’s really something. And 20% of patients went from NYHA class III to class I – that’s really something, too,” added Dr. Jankowska, professor of medicine and head of the laboratory of applied research on the cardiovascular system at Wroclaw (Poland) University.
How baroreflex activation therapy works
The BaroStim system consists of a 2-mm unipolar electrode on a 7-mm backer that is placed over the carotid sinus. It is supported by a small generator with a 4- to 5-year battery life implanted under the collarbone, along with radiofrequency telemetry capability and programming flexibility.
Stimulation of the carotid baroreceptor promotes an integrated autonomic nervous system response which enhances parasympathetic activity and inhibits sympathetic nervous system activity. The result, as shown in numerous earlier proof-of-concept studies, is a reduced heart rate, decreased ventricular remodeling, enhanced diuresis, increased vasodilation, a drop in elevated blood pressure, and decreased renin secretion – all achieved nonpharmacologically.
The study was sponsored by CVRx. Dr. Lindenfeld reported serving as a consultant to CVRx, Abbott, AstraZeneca, Boehringer Ingelheim, Edwards Lifesciences, Impulse Dynamics, and VWave.
The striking gains in functional capacity and quality of life conferred by baroreflex activation therapy in patients with heart failure, as shown in the pivotal phase 3 clinical trial for this novel intervention, were at least as great in women as in men, JoAnn Lindenfeld, MD, said at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
The results of the multicenter, prospective, randomized BeAT-HF trial led to marketing approval of the BaroStim Neo system for improvement in symptoms of heart failure with reduced ejection fraction (HFrEF) by the Food and Drug Administration in August 2019. Dr. Lindenfeld presented a fresh breakdown of the results by gender which showed, intriguingly, that the improvement in all study endpoints was consistently numerically greater in the women – sometimes startlingly so – although these gender differences in response didn’t achieve statistical significance. The 6-month randomized trial was underpowered for drawing definitive conclusions on that score, with a study population of only 53 women and 211 men. So the investigator remained circumspect.
“We think that what this study shows us is that women have at least equivalent improvement as men in this population. I don’t think we can conclude from this study yet that it’s better, but it’s certainly in all these parameters as least as good. And I think this is a population in which we’ve seen that improving symptoms and functional capacity is very important,” said Dr. Lindenfeld, professor of medicine and director of advanced heart failure/cardiac transplantation at Vanderbilt University, Nashville, Tenn.
The FDA approval was restricted to patients like those enrolled in BeAT-HF: that is, individuals with New York Heart Association functional class III heart failure, a left ventricular ejection fraction of 35% or less while on stable optimal medical therapy, and ineligibility for cardiac resynchronization therapy according to current guidelines. Seventy-eight percent of BeAT-HF participants had an implantable cardioverter-defibrillator.
Participants were randomized to baroreflex activation therapy (BAT) plus optimal medical therapy or to optimal medical therapy alone. The three coprimary endpoints were change from baseline to 6 months in 6-minute hall walk distance (6MHW), scores on the Minnesota Living with Heart Failure Questionnaire (MLHF), and N-terminal pro-B-type natriuretic peptide (NT-proBNP).
In the overall study population, 6MHW increased by 60 m in the BAT group and decreased by 8 m in controls; MLHF scores dropped by 14 and 6 points, respectively; and NT-proBNP fell by an average of 25% with BAT while rising by 3% in controls.
Very often, just a 5-point reduction in MLHF score is considered a clinically meaningful improvement in quality of life, the cardiologist noted.
The gender-based analysis is where things got particularly interesting.
The investigators defined a clinically relevant response as a greater than 10% increase from baseline on the 6MHW, at least a one-class improvement in NYHA class, or a reduction of 5 points or more on the MLHF. Among subjects in the BAT group, 70% of women and 60% of men met the clinically relevant response standard in terms of 6MHW, as did 70% of women and 64% of men for improvement in NYHA class, and 78% of women and 66% of men for MLHF score.
Eighty-seven percent of women and 68% of men on BAT had a clinically relevant response on at least one of these endpoints, as did about 28% of controls. Moreover, 31% of women in the BAT group were clinically relevant responders on at least two endpoints, compared with 19% of BAT men and 4% and 9% of controls.
Women dominate super-responder category
In order to be classified as a super responder, a patient had to demonstrate a greater than 20% increase in 6MHW, improvement in NYHA class I status, or at least a 10-point improvement in MLHF score. Ninety-one percent of women on BAT achieved super-responder status for at least one of these endpoints, compared with 76% of men. Forty-three percent of women and 24% of men in the BAT group were super responders in at least two domains, as were 8% and 11% of female and male controls, Dr. Lindenfeld continued.
Discussant Ewa Anita Jankowska, MD, PhD, deemed the BeAT-HF results on the therapeutic benefits of this autonomic modulation strategy “quite convincing.”
“We need to acknowledge that in recent years we have been spoiled a bit by the huge trials in heart failure where the ultimate goal was a reduction in mortality. But I think this is the time when we should think about the patients who want to live – here, now – with a better life. Patients expect symptomatic benefits. There is a substantial group of patients who are symptomatic even though they receive quite extensive neurohormonal blockage and who are not suitable for CRT. This study demonstrates that, for this group of patients, BAT can bring really significant symptomatic benefits,” she said.
“If you think about a treatment that provides patients who are NYHA class III an increase in 6MHW of 60 meters, that’s really something. And 20% of patients went from NYHA class III to class I – that’s really something, too,” added Dr. Jankowska, professor of medicine and head of the laboratory of applied research on the cardiovascular system at Wroclaw (Poland) University.
How baroreflex activation therapy works
The BaroStim system consists of a 2-mm unipolar electrode on a 7-mm backer that is placed over the carotid sinus. It is supported by a small generator with a 4- to 5-year battery life implanted under the collarbone, along with radiofrequency telemetry capability and programming flexibility.
Stimulation of the carotid baroreceptor promotes an integrated autonomic nervous system response which enhances parasympathetic activity and inhibits sympathetic nervous system activity. The result, as shown in numerous earlier proof-of-concept studies, is a reduced heart rate, decreased ventricular remodeling, enhanced diuresis, increased vasodilation, a drop in elevated blood pressure, and decreased renin secretion – all achieved nonpharmacologically.
The study was sponsored by CVRx. Dr. Lindenfeld reported serving as a consultant to CVRx, Abbott, AstraZeneca, Boehringer Ingelheim, Edwards Lifesciences, Impulse Dynamics, and VWave.
FROM ESC HEART FAILURE 2020
Mortality differs by LVEF between women and men
, Simon Stewart, PhD, reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
This analysis from the ongoing National Echocardiography Database of Australia (NEDA) included 499,153 men and women who underwent echocardiography in routine clinical practice for a variety of indications, with more than 3 million person-years of follow-up.
This study broke new ground. There is surprisingly little information from routine clinical practice to describe the spectrum and prognostic importance of left ventricular ejection fraction (LVEF). Indeed, most data have come from clinical trials in patients with heart failure with reduced ejection fraction (HFrEF), in which women are traditionally underrepresented. By comparison, the NEDA analysis included 237,046 women in routine care, noted Dr. Stewart, a National Health and Medical Research Council of Australia Senior Principal Research Fellow at Torrens University in Adelaide.
Among the novel findings in the new NEDA analysis: an LVEF below 50% was more than twice as common in men than women, occurring in 17.6% and 8.3%, respectively. Also, women had a higher average LVEF: 64.2%, compared with 59.5% in men. The overall 1- and 5-year all-cause mortality rates in the half-million participants were 5.8% and 18.4%.
Cardiovascular-related mortality occurred in 7.1% of women in median of 5.6 years of follow-up and in 8.1% of men with 5.5 years of follow-up.
All-cause and cardiovascular mortality rates followed a J-shaped curve, with the clear nadir occurring at an LVEF of 65%-69.9% in both women and men. But for LVEF values outside the nadir, a striking sex-based difference was present. Cardiovascular mortality, when adjusted for body mass index, age, heart rate, valvular heart disease, E-wave velocity, and other potential confounders, wasn’t significantly different between men whose LVEF was 65%-69.9% and those with an LVEF of 45%-64.9%. It started climbing in earnest only at an LVEF below 45%. In contrast, women with an LVEF of 45%-54.9% had a statistically significant twofold increased cardiovascular mortality rate compared to those in the nadir. Moreover, women with an LVEF of 55%-59.9% showed a trend in the same unwanted direction.
High LVEF, higher mortality in women
Dr. Stewart drew attention to an inflection point in the mortality curve for women whereby mortality began climbing at LVEF values of 70% or more. Values in that high range were documented in 72,379 women and 51,317 men.
He noted that the NEDA finding of an increasing mortality risk at LVEFs of at least 70%, especially in women, is similar to a recent report from another big data study, this one involving more than 200,000 patients who underwent echocardiography in routine clinical practice in the Geisinger health system in Pennsylvania. The investigators found in this retrospective study that during a median of 4 years of follow-up after echocardiography, the adjusted risk for all-cause mortality followed a U-shaped curve. The nadir of risk occurred in patients with an LVEF of 60%-65%, with a 1.71-fold increased risk at an LVEF at 70% or more and a near-identical 1.73-fold increased risk at an LVEF of 35%-40%. In this study, however, which was less than half the size of the NEDA analysis, the U-shaped LVEF/mortality curve applied to both men and women. Similar findings were seen in a validation cohort of nearly 36,000 patients from New Zealand (Eur Heart J. 2020 Mar 21;41[12]:1249-57).
The investigators predicted that in addition to the existing categories of HFrEF, heart failure with preserved ejection fraction (HFpEF), and the more recently proposed heart failure with midrange ejection fraction (HFmrEF), their results “may herald the recognition of a new phenotype characterized by supranormal LVEF,” with a moniker of HFsnEF.
New treatment opportunity for women?
Discussant Lars Lund, MD, PhD, professor of cardiology at the Karolinska Institute, Stockholm, said that it’s not possible to make any statements about what constitutes a “normal” LVEF in men or women based on the NEDA study, since all participants underwent medically indicated echocardiography. He added that what he found most interesting about the NEDA analysis was the observation that women with mid-range or mildly reduced LVEF had increased mortality, while men didn’t. That’s a finding that helps explain the suggestion of possible benefit for sacubitril-valsartan in patients with lower ejection fraction and in women in the PARAGON-HF trial of angiotensin-neprilysin inhibition in patients with heart failure with preserved ejection fraction (N Engl J Med. 2019 Oct 24;381[17]:1609-20).
Dr. Lund expressed the hope that the NEDA investigators will do an analysis of the relationship between echocardiographic left atrial size and mortality. Dr. Stewart replied that, as a matter of fact,such a study is planned. The enormous and continuously growing NEDA database has already been used to provide new insights into aortic stenosis and pulmonary hypertension, he noted.
Session moderator Andrew Coats, MD, incoming president of the ESC Heart Failure Association, said that there are many different methods used for echocardiographic measurement of LVEF. He wondered about the validity of pooling them in a single analysis.
Dr. Stewart replied that NEDA software applies a hierarchical weighting of the various methods used to quantify LVEF. And the submitted data come from the top echocardiography laboratories throughout Australia.
“We’ve done some sensitivity analyses around the different methods of quantifying LVEF and we get the same patterns,” he said. “We’re comfortable with the validity of what we’ve done. The big data allows us to do that.”
Dr. Stewart reported receiving speakers fees and travel support from Novartis, a partial funder of NEDA.
SOURCE: Stewart S. ESC Heart Failure 2020.
, Simon Stewart, PhD, reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
This analysis from the ongoing National Echocardiography Database of Australia (NEDA) included 499,153 men and women who underwent echocardiography in routine clinical practice for a variety of indications, with more than 3 million person-years of follow-up.
This study broke new ground. There is surprisingly little information from routine clinical practice to describe the spectrum and prognostic importance of left ventricular ejection fraction (LVEF). Indeed, most data have come from clinical trials in patients with heart failure with reduced ejection fraction (HFrEF), in which women are traditionally underrepresented. By comparison, the NEDA analysis included 237,046 women in routine care, noted Dr. Stewart, a National Health and Medical Research Council of Australia Senior Principal Research Fellow at Torrens University in Adelaide.
Among the novel findings in the new NEDA analysis: an LVEF below 50% was more than twice as common in men than women, occurring in 17.6% and 8.3%, respectively. Also, women had a higher average LVEF: 64.2%, compared with 59.5% in men. The overall 1- and 5-year all-cause mortality rates in the half-million participants were 5.8% and 18.4%.
Cardiovascular-related mortality occurred in 7.1% of women in median of 5.6 years of follow-up and in 8.1% of men with 5.5 years of follow-up.
All-cause and cardiovascular mortality rates followed a J-shaped curve, with the clear nadir occurring at an LVEF of 65%-69.9% in both women and men. But for LVEF values outside the nadir, a striking sex-based difference was present. Cardiovascular mortality, when adjusted for body mass index, age, heart rate, valvular heart disease, E-wave velocity, and other potential confounders, wasn’t significantly different between men whose LVEF was 65%-69.9% and those with an LVEF of 45%-64.9%. It started climbing in earnest only at an LVEF below 45%. In contrast, women with an LVEF of 45%-54.9% had a statistically significant twofold increased cardiovascular mortality rate compared to those in the nadir. Moreover, women with an LVEF of 55%-59.9% showed a trend in the same unwanted direction.
High LVEF, higher mortality in women
Dr. Stewart drew attention to an inflection point in the mortality curve for women whereby mortality began climbing at LVEF values of 70% or more. Values in that high range were documented in 72,379 women and 51,317 men.
He noted that the NEDA finding of an increasing mortality risk at LVEFs of at least 70%, especially in women, is similar to a recent report from another big data study, this one involving more than 200,000 patients who underwent echocardiography in routine clinical practice in the Geisinger health system in Pennsylvania. The investigators found in this retrospective study that during a median of 4 years of follow-up after echocardiography, the adjusted risk for all-cause mortality followed a U-shaped curve. The nadir of risk occurred in patients with an LVEF of 60%-65%, with a 1.71-fold increased risk at an LVEF at 70% or more and a near-identical 1.73-fold increased risk at an LVEF of 35%-40%. In this study, however, which was less than half the size of the NEDA analysis, the U-shaped LVEF/mortality curve applied to both men and women. Similar findings were seen in a validation cohort of nearly 36,000 patients from New Zealand (Eur Heart J. 2020 Mar 21;41[12]:1249-57).
The investigators predicted that in addition to the existing categories of HFrEF, heart failure with preserved ejection fraction (HFpEF), and the more recently proposed heart failure with midrange ejection fraction (HFmrEF), their results “may herald the recognition of a new phenotype characterized by supranormal LVEF,” with a moniker of HFsnEF.
New treatment opportunity for women?
Discussant Lars Lund, MD, PhD, professor of cardiology at the Karolinska Institute, Stockholm, said that it’s not possible to make any statements about what constitutes a “normal” LVEF in men or women based on the NEDA study, since all participants underwent medically indicated echocardiography. He added that what he found most interesting about the NEDA analysis was the observation that women with mid-range or mildly reduced LVEF had increased mortality, while men didn’t. That’s a finding that helps explain the suggestion of possible benefit for sacubitril-valsartan in patients with lower ejection fraction and in women in the PARAGON-HF trial of angiotensin-neprilysin inhibition in patients with heart failure with preserved ejection fraction (N Engl J Med. 2019 Oct 24;381[17]:1609-20).
Dr. Lund expressed the hope that the NEDA investigators will do an analysis of the relationship between echocardiographic left atrial size and mortality. Dr. Stewart replied that, as a matter of fact,such a study is planned. The enormous and continuously growing NEDA database has already been used to provide new insights into aortic stenosis and pulmonary hypertension, he noted.
Session moderator Andrew Coats, MD, incoming president of the ESC Heart Failure Association, said that there are many different methods used for echocardiographic measurement of LVEF. He wondered about the validity of pooling them in a single analysis.
Dr. Stewart replied that NEDA software applies a hierarchical weighting of the various methods used to quantify LVEF. And the submitted data come from the top echocardiography laboratories throughout Australia.
“We’ve done some sensitivity analyses around the different methods of quantifying LVEF and we get the same patterns,” he said. “We’re comfortable with the validity of what we’ve done. The big data allows us to do that.”
Dr. Stewart reported receiving speakers fees and travel support from Novartis, a partial funder of NEDA.
SOURCE: Stewart S. ESC Heart Failure 2020.
, Simon Stewart, PhD, reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
This analysis from the ongoing National Echocardiography Database of Australia (NEDA) included 499,153 men and women who underwent echocardiography in routine clinical practice for a variety of indications, with more than 3 million person-years of follow-up.
This study broke new ground. There is surprisingly little information from routine clinical practice to describe the spectrum and prognostic importance of left ventricular ejection fraction (LVEF). Indeed, most data have come from clinical trials in patients with heart failure with reduced ejection fraction (HFrEF), in which women are traditionally underrepresented. By comparison, the NEDA analysis included 237,046 women in routine care, noted Dr. Stewart, a National Health and Medical Research Council of Australia Senior Principal Research Fellow at Torrens University in Adelaide.
Among the novel findings in the new NEDA analysis: an LVEF below 50% was more than twice as common in men than women, occurring in 17.6% and 8.3%, respectively. Also, women had a higher average LVEF: 64.2%, compared with 59.5% in men. The overall 1- and 5-year all-cause mortality rates in the half-million participants were 5.8% and 18.4%.
Cardiovascular-related mortality occurred in 7.1% of women in median of 5.6 years of follow-up and in 8.1% of men with 5.5 years of follow-up.
All-cause and cardiovascular mortality rates followed a J-shaped curve, with the clear nadir occurring at an LVEF of 65%-69.9% in both women and men. But for LVEF values outside the nadir, a striking sex-based difference was present. Cardiovascular mortality, when adjusted for body mass index, age, heart rate, valvular heart disease, E-wave velocity, and other potential confounders, wasn’t significantly different between men whose LVEF was 65%-69.9% and those with an LVEF of 45%-64.9%. It started climbing in earnest only at an LVEF below 45%. In contrast, women with an LVEF of 45%-54.9% had a statistically significant twofold increased cardiovascular mortality rate compared to those in the nadir. Moreover, women with an LVEF of 55%-59.9% showed a trend in the same unwanted direction.
High LVEF, higher mortality in women
Dr. Stewart drew attention to an inflection point in the mortality curve for women whereby mortality began climbing at LVEF values of 70% or more. Values in that high range were documented in 72,379 women and 51,317 men.
He noted that the NEDA finding of an increasing mortality risk at LVEFs of at least 70%, especially in women, is similar to a recent report from another big data study, this one involving more than 200,000 patients who underwent echocardiography in routine clinical practice in the Geisinger health system in Pennsylvania. The investigators found in this retrospective study that during a median of 4 years of follow-up after echocardiography, the adjusted risk for all-cause mortality followed a U-shaped curve. The nadir of risk occurred in patients with an LVEF of 60%-65%, with a 1.71-fold increased risk at an LVEF at 70% or more and a near-identical 1.73-fold increased risk at an LVEF of 35%-40%. In this study, however, which was less than half the size of the NEDA analysis, the U-shaped LVEF/mortality curve applied to both men and women. Similar findings were seen in a validation cohort of nearly 36,000 patients from New Zealand (Eur Heart J. 2020 Mar 21;41[12]:1249-57).
The investigators predicted that in addition to the existing categories of HFrEF, heart failure with preserved ejection fraction (HFpEF), and the more recently proposed heart failure with midrange ejection fraction (HFmrEF), their results “may herald the recognition of a new phenotype characterized by supranormal LVEF,” with a moniker of HFsnEF.
New treatment opportunity for women?
Discussant Lars Lund, MD, PhD, professor of cardiology at the Karolinska Institute, Stockholm, said that it’s not possible to make any statements about what constitutes a “normal” LVEF in men or women based on the NEDA study, since all participants underwent medically indicated echocardiography. He added that what he found most interesting about the NEDA analysis was the observation that women with mid-range or mildly reduced LVEF had increased mortality, while men didn’t. That’s a finding that helps explain the suggestion of possible benefit for sacubitril-valsartan in patients with lower ejection fraction and in women in the PARAGON-HF trial of angiotensin-neprilysin inhibition in patients with heart failure with preserved ejection fraction (N Engl J Med. 2019 Oct 24;381[17]:1609-20).
Dr. Lund expressed the hope that the NEDA investigators will do an analysis of the relationship between echocardiographic left atrial size and mortality. Dr. Stewart replied that, as a matter of fact,such a study is planned. The enormous and continuously growing NEDA database has already been used to provide new insights into aortic stenosis and pulmonary hypertension, he noted.
Session moderator Andrew Coats, MD, incoming president of the ESC Heart Failure Association, said that there are many different methods used for echocardiographic measurement of LVEF. He wondered about the validity of pooling them in a single analysis.
Dr. Stewart replied that NEDA software applies a hierarchical weighting of the various methods used to quantify LVEF. And the submitted data come from the top echocardiography laboratories throughout Australia.
“We’ve done some sensitivity analyses around the different methods of quantifying LVEF and we get the same patterns,” he said. “We’re comfortable with the validity of what we’ve done. The big data allows us to do that.”
Dr. Stewart reported receiving speakers fees and travel support from Novartis, a partial funder of NEDA.
SOURCE: Stewart S. ESC Heart Failure 2020.
FROM ESC HEART FAILURE 2020
VICTORIA results deepen mystery of vericiguat in low-EF heart failure
Although clinical outcomes improved for patients with high-risk heart failure (HF) who received vericiguat (Merck/Bayer) on top of standard therapy in a major randomized trial, a subgroup study failed to show any corresponding gains in ventricular function.
The discordant results from the 5,050-patient VICTORIA trial and its echocardiographic substudy highlight something of a mystery as to the mechanism of the investigational oral soluble guanylate cyclase stimulator’s clinical effects. In the overall trial, they included a drop in risk of cardiovascular (CV) death or first HF hospitalization, the primary endpoint.
In the echo substudy, which assessed patients with evaluable echocardiograms at both baseline and 8 months, vericiguat, compared with placebo, had no significant effect on two measures of left ventricular (LV) function. Patients in the prospectively conducted substudy made up less than 10% of the total trial population.
Both LV ejection fraction (LVEF) and LV end-systolic volume index (LVESVI) significantly improved in the vericiguat and control groups, but vericiguat “had no additional significant effect,” said Burkert Pieske, MD, of Charité University Medicine Berlin.
Still, he said, there was “evidence of a lower risk of events, evidence of a clinical benefit,” for those who received vericiguat, although it fell slightly short of significance in the substudy cohort of fewer than 500 patients.
Dr. Pieske reported the VICTORIA echo substudy results June 5 in a Late-Breaking Science Session during HFA Discoveries, the online backup for the Heart Failure Association of the European Society of Cardiology annual scientific meeting.
The traditional live HFA meeting had been scheduled for Barcelona but was canceled this year as a result of the COVID-19 pandemic.
Pointing to the significant echo improvements in both treatment groups, invited discussant Rudolf A. de Boer, MD, PhD, University of Groningen (the Netherlands), said the substudy shows that HF in high-risk patients “is associated with a transient deterioration of LV function and geometry, which can to a certain extent be reversed over time.”
That the effect apparently wasn’t influenced by vericiguat “may be explained by the fact that, in randomized controlled trials, patients – including those on placebo – tend to be treated very well.” In clinical practice, he said, “less complete reverse remodeling may be expected.”
Dr. de Boer also pointed to likely survivor bias in the study, in that only patients who survived to at least 8 months were included. That meant, among other things, that they were likely at lower overall risk than the total VICTORIA population, leaving less room for any treatment effect.
“Further, likely because of the play of chance in this substudy, the LV volumes were smaller in the vericiguat group at baseline, creating less of an opportunity for vericiguat to make a difference,” he said. “It could be speculated that, with larger volumes, the window of opportunity for vericiguat would have been wider.”
But “most strikingly,” the lack of vericiguat effect on echo parameters contrasts with the clinical benefits associated with the drug in the main trial, and possibly in the echo substudy, Dr. de Boer said, “creating a dissociation between the surrogate echo parameters and the clinical hard endpoints. And it could be imagined that the rather crude echo measures presented here, LVEF and LV volume, miss a more subtle effect of vericiguat.”
For example, it’s possible that the drug’s clinical effect in heart failure does not depend on any improvements in ventricular function, Dr. de Boer said, adding that vericiguat “may potentially also have important effects on pulmonary and peripheral vasculature,” so he recommended future studies look for any changes in arterial and right ventricular function from the drug.
VICTORIA enrolled only patients with HF and reduced ejection fraction who had previously experienced a decompensation event, usually only within the last 3 months, as it turned out. Those assigned to vericiguat on top of standard drug and device therapies showed a modest 10% decline in adjusted relative risk (P = .019) for the trial’s primary endpoint, CV death or first HF hospitalization.
But when the results were unveiled at a meeting, trialists and observers were more enthused about the drug’s effect in absolute terms, which by one measure was 4.2 fewer events on vericiguat per 100 patient-years. That translated to a number to treat of 24 to prevent one event, said to be impressive, given that the study’s patients were so high risk.
The echo substudy included 419 prospectively selected patients, 208 on vericiguat and 211 assigned to placebo, who had evaluable echocardiograms at both baseline and 8 months, as assessed at the VICTORIA echo core lab. They averaged 64.5 years in age with a mean baseline LVEF of 29%; about 27% were women.
Their clinical outcomes paralleled the overall study, with lower event rates overall and a difference between treatment groups that fell short of significance.
Neither of the study’s primary endpoints, the two echo parameters, responded differently to vericiguat, compared with placebo.
The overall VICTORIA trial “showed a modest but useful benefit in the combined endpoint of hospitalizations and mortality, but all due to fewer hospitalizations,” Andrew J. Coats, MD, DSc, MBA, told this news organization.
“The echo substudy was smaller, and many drugs that reduce hospitalization do not do it through effects on LV function,” said Dr. Coats of the University of Warwick, Coventry, England, who wasn’t a part of VICTORIA. “Other mechanisms may be via improved peripheral vascular or renal effects.”
VICTORIA and the echocardiographic substudy were supported by Merck Sharp & Dohme and Bayer AG. Dr. Pieske disclosed serving on a speakers bureau, advisory board, or committee for Bayer Healthcare, Merck, Novartis, AstraZeneca, Stealth, Servier, Daiichi-Sankyo, Biotronic, Abbott Vascular, and Bristol-Myers Squibb. Dr. de Boer disclosed receiving speaker fees from Abbott, AstraZeneca, Novartis, and Roche. Dr. Coats disclosed receiving personal fees from Actimed, AstraZeneca, Faraday, WL Gore, Menarini, Novartis, Nutricia, Respicardia, Servier, Stealth Peptides, Verona, and Vifor.
A version of this article originally appeared on Medscape.com.
Although clinical outcomes improved for patients with high-risk heart failure (HF) who received vericiguat (Merck/Bayer) on top of standard therapy in a major randomized trial, a subgroup study failed to show any corresponding gains in ventricular function.
The discordant results from the 5,050-patient VICTORIA trial and its echocardiographic substudy highlight something of a mystery as to the mechanism of the investigational oral soluble guanylate cyclase stimulator’s clinical effects. In the overall trial, they included a drop in risk of cardiovascular (CV) death or first HF hospitalization, the primary endpoint.
In the echo substudy, which assessed patients with evaluable echocardiograms at both baseline and 8 months, vericiguat, compared with placebo, had no significant effect on two measures of left ventricular (LV) function. Patients in the prospectively conducted substudy made up less than 10% of the total trial population.
Both LV ejection fraction (LVEF) and LV end-systolic volume index (LVESVI) significantly improved in the vericiguat and control groups, but vericiguat “had no additional significant effect,” said Burkert Pieske, MD, of Charité University Medicine Berlin.
Still, he said, there was “evidence of a lower risk of events, evidence of a clinical benefit,” for those who received vericiguat, although it fell slightly short of significance in the substudy cohort of fewer than 500 patients.
Dr. Pieske reported the VICTORIA echo substudy results June 5 in a Late-Breaking Science Session during HFA Discoveries, the online backup for the Heart Failure Association of the European Society of Cardiology annual scientific meeting.
The traditional live HFA meeting had been scheduled for Barcelona but was canceled this year as a result of the COVID-19 pandemic.
Pointing to the significant echo improvements in both treatment groups, invited discussant Rudolf A. de Boer, MD, PhD, University of Groningen (the Netherlands), said the substudy shows that HF in high-risk patients “is associated with a transient deterioration of LV function and geometry, which can to a certain extent be reversed over time.”
That the effect apparently wasn’t influenced by vericiguat “may be explained by the fact that, in randomized controlled trials, patients – including those on placebo – tend to be treated very well.” In clinical practice, he said, “less complete reverse remodeling may be expected.”
Dr. de Boer also pointed to likely survivor bias in the study, in that only patients who survived to at least 8 months were included. That meant, among other things, that they were likely at lower overall risk than the total VICTORIA population, leaving less room for any treatment effect.
“Further, likely because of the play of chance in this substudy, the LV volumes were smaller in the vericiguat group at baseline, creating less of an opportunity for vericiguat to make a difference,” he said. “It could be speculated that, with larger volumes, the window of opportunity for vericiguat would have been wider.”
But “most strikingly,” the lack of vericiguat effect on echo parameters contrasts with the clinical benefits associated with the drug in the main trial, and possibly in the echo substudy, Dr. de Boer said, “creating a dissociation between the surrogate echo parameters and the clinical hard endpoints. And it could be imagined that the rather crude echo measures presented here, LVEF and LV volume, miss a more subtle effect of vericiguat.”
For example, it’s possible that the drug’s clinical effect in heart failure does not depend on any improvements in ventricular function, Dr. de Boer said, adding that vericiguat “may potentially also have important effects on pulmonary and peripheral vasculature,” so he recommended future studies look for any changes in arterial and right ventricular function from the drug.
VICTORIA enrolled only patients with HF and reduced ejection fraction who had previously experienced a decompensation event, usually only within the last 3 months, as it turned out. Those assigned to vericiguat on top of standard drug and device therapies showed a modest 10% decline in adjusted relative risk (P = .019) for the trial’s primary endpoint, CV death or first HF hospitalization.
But when the results were unveiled at a meeting, trialists and observers were more enthused about the drug’s effect in absolute terms, which by one measure was 4.2 fewer events on vericiguat per 100 patient-years. That translated to a number to treat of 24 to prevent one event, said to be impressive, given that the study’s patients were so high risk.
The echo substudy included 419 prospectively selected patients, 208 on vericiguat and 211 assigned to placebo, who had evaluable echocardiograms at both baseline and 8 months, as assessed at the VICTORIA echo core lab. They averaged 64.5 years in age with a mean baseline LVEF of 29%; about 27% were women.
Their clinical outcomes paralleled the overall study, with lower event rates overall and a difference between treatment groups that fell short of significance.
Neither of the study’s primary endpoints, the two echo parameters, responded differently to vericiguat, compared with placebo.
The overall VICTORIA trial “showed a modest but useful benefit in the combined endpoint of hospitalizations and mortality, but all due to fewer hospitalizations,” Andrew J. Coats, MD, DSc, MBA, told this news organization.
“The echo substudy was smaller, and many drugs that reduce hospitalization do not do it through effects on LV function,” said Dr. Coats of the University of Warwick, Coventry, England, who wasn’t a part of VICTORIA. “Other mechanisms may be via improved peripheral vascular or renal effects.”
VICTORIA and the echocardiographic substudy were supported by Merck Sharp & Dohme and Bayer AG. Dr. Pieske disclosed serving on a speakers bureau, advisory board, or committee for Bayer Healthcare, Merck, Novartis, AstraZeneca, Stealth, Servier, Daiichi-Sankyo, Biotronic, Abbott Vascular, and Bristol-Myers Squibb. Dr. de Boer disclosed receiving speaker fees from Abbott, AstraZeneca, Novartis, and Roche. Dr. Coats disclosed receiving personal fees from Actimed, AstraZeneca, Faraday, WL Gore, Menarini, Novartis, Nutricia, Respicardia, Servier, Stealth Peptides, Verona, and Vifor.
A version of this article originally appeared on Medscape.com.
Although clinical outcomes improved for patients with high-risk heart failure (HF) who received vericiguat (Merck/Bayer) on top of standard therapy in a major randomized trial, a subgroup study failed to show any corresponding gains in ventricular function.
The discordant results from the 5,050-patient VICTORIA trial and its echocardiographic substudy highlight something of a mystery as to the mechanism of the investigational oral soluble guanylate cyclase stimulator’s clinical effects. In the overall trial, they included a drop in risk of cardiovascular (CV) death or first HF hospitalization, the primary endpoint.
In the echo substudy, which assessed patients with evaluable echocardiograms at both baseline and 8 months, vericiguat, compared with placebo, had no significant effect on two measures of left ventricular (LV) function. Patients in the prospectively conducted substudy made up less than 10% of the total trial population.
Both LV ejection fraction (LVEF) and LV end-systolic volume index (LVESVI) significantly improved in the vericiguat and control groups, but vericiguat “had no additional significant effect,” said Burkert Pieske, MD, of Charité University Medicine Berlin.
Still, he said, there was “evidence of a lower risk of events, evidence of a clinical benefit,” for those who received vericiguat, although it fell slightly short of significance in the substudy cohort of fewer than 500 patients.
Dr. Pieske reported the VICTORIA echo substudy results June 5 in a Late-Breaking Science Session during HFA Discoveries, the online backup for the Heart Failure Association of the European Society of Cardiology annual scientific meeting.
The traditional live HFA meeting had been scheduled for Barcelona but was canceled this year as a result of the COVID-19 pandemic.
Pointing to the significant echo improvements in both treatment groups, invited discussant Rudolf A. de Boer, MD, PhD, University of Groningen (the Netherlands), said the substudy shows that HF in high-risk patients “is associated with a transient deterioration of LV function and geometry, which can to a certain extent be reversed over time.”
That the effect apparently wasn’t influenced by vericiguat “may be explained by the fact that, in randomized controlled trials, patients – including those on placebo – tend to be treated very well.” In clinical practice, he said, “less complete reverse remodeling may be expected.”
Dr. de Boer also pointed to likely survivor bias in the study, in that only patients who survived to at least 8 months were included. That meant, among other things, that they were likely at lower overall risk than the total VICTORIA population, leaving less room for any treatment effect.
“Further, likely because of the play of chance in this substudy, the LV volumes were smaller in the vericiguat group at baseline, creating less of an opportunity for vericiguat to make a difference,” he said. “It could be speculated that, with larger volumes, the window of opportunity for vericiguat would have been wider.”
But “most strikingly,” the lack of vericiguat effect on echo parameters contrasts with the clinical benefits associated with the drug in the main trial, and possibly in the echo substudy, Dr. de Boer said, “creating a dissociation between the surrogate echo parameters and the clinical hard endpoints. And it could be imagined that the rather crude echo measures presented here, LVEF and LV volume, miss a more subtle effect of vericiguat.”
For example, it’s possible that the drug’s clinical effect in heart failure does not depend on any improvements in ventricular function, Dr. de Boer said, adding that vericiguat “may potentially also have important effects on pulmonary and peripheral vasculature,” so he recommended future studies look for any changes in arterial and right ventricular function from the drug.
VICTORIA enrolled only patients with HF and reduced ejection fraction who had previously experienced a decompensation event, usually only within the last 3 months, as it turned out. Those assigned to vericiguat on top of standard drug and device therapies showed a modest 10% decline in adjusted relative risk (P = .019) for the trial’s primary endpoint, CV death or first HF hospitalization.
But when the results were unveiled at a meeting, trialists and observers were more enthused about the drug’s effect in absolute terms, which by one measure was 4.2 fewer events on vericiguat per 100 patient-years. That translated to a number to treat of 24 to prevent one event, said to be impressive, given that the study’s patients were so high risk.
The echo substudy included 419 prospectively selected patients, 208 on vericiguat and 211 assigned to placebo, who had evaluable echocardiograms at both baseline and 8 months, as assessed at the VICTORIA echo core lab. They averaged 64.5 years in age with a mean baseline LVEF of 29%; about 27% were women.
Their clinical outcomes paralleled the overall study, with lower event rates overall and a difference between treatment groups that fell short of significance.
Neither of the study’s primary endpoints, the two echo parameters, responded differently to vericiguat, compared with placebo.
The overall VICTORIA trial “showed a modest but useful benefit in the combined endpoint of hospitalizations and mortality, but all due to fewer hospitalizations,” Andrew J. Coats, MD, DSc, MBA, told this news organization.
“The echo substudy was smaller, and many drugs that reduce hospitalization do not do it through effects on LV function,” said Dr. Coats of the University of Warwick, Coventry, England, who wasn’t a part of VICTORIA. “Other mechanisms may be via improved peripheral vascular or renal effects.”
VICTORIA and the echocardiographic substudy were supported by Merck Sharp & Dohme and Bayer AG. Dr. Pieske disclosed serving on a speakers bureau, advisory board, or committee for Bayer Healthcare, Merck, Novartis, AstraZeneca, Stealth, Servier, Daiichi-Sankyo, Biotronic, Abbott Vascular, and Bristol-Myers Squibb. Dr. de Boer disclosed receiving speaker fees from Abbott, AstraZeneca, Novartis, and Roche. Dr. Coats disclosed receiving personal fees from Actimed, AstraZeneca, Faraday, WL Gore, Menarini, Novartis, Nutricia, Respicardia, Servier, Stealth Peptides, Verona, and Vifor.
A version of this article originally appeared on Medscape.com.
FROM ESC HEART FAILURE 2020
High-dose tafamidis boosts survival in transthyretin amyloidosis cardiomyopathy
Treatment with oral tafamidis at 80 mg/day provided a significantly greater survival benefit than dosing at 20 mg/day in patients with transthyretin amyloid cardiomyopathy in the long-term extension of the landmark ATTR-ACT trial, Thibaud Damy, MD, PhD, reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
Moreover, the superior survival benefit achieved by taking four 20-mg capsules of tafamidis (Vyndaqel) once daily – or its more convenient once-daily, single-capsule, 61-mg bioequivalent formulation marketed as Vyndamax – came at no cost in terms of side effects and toxicity, compared with low-dose therapy for this progressive multisystem disease, according to Dr. Damy, professor of cardiology at the University of Paris and head of the French National Referral Center for Cardiac Amyloidosis at Henri Mondor University Hospital, Créteil, France.
“There are no side effects with tafamidis,” he said. “It doesn’t act on any receptors, it just acts on the formation of amyloid fibrils, so there are no side effects at whatever dosage is used. And in ATTR-ACT there was actually a trend towards increased side effects in the placebo group because the amyloidosis is everywhere, so by decreasing the amyloidosis process you improve not only the heart but all the organs, and the patient has a better quality of life.”
ATTR-ACT (Transthyretin Amyloidosis Cardiomyopathy Clinical Trial) was a phase 3, double-blind study in which 441 patients with transthyretin amyloidosis cardiomyopathy (TAC) in 13 countries were randomized to tafamidis at either 80 mg or 20 mg per day or placebo and followed prospectively for 30 months. At 30 months, all-cause mortality was 29.5% in patients who received tafamidis, compared with 42.9% in controls, for a statistically significant and clinically important 30% relative risk reduction, establishing tafamidis as the first disease-modifying therapy for this disease (N Engl J Med. 2018 Sep 13;379[11]:1007-16).
Patients in the 80-mg group had a 20% reduction in the risk of death, compared with the 20-mg group, at 30 months in an analysis adjusted for baseline age, 6-minute walk distance, and N-terminal pro-B-type natriuretic peptide, all of which are known to impact survival in TAC. This between-group survival difference wasn’t statistically significant, providing one impetus for the subsequent long-term extension study, in which patients remained on their original dose of tafamidis, and the controls who’d been on placebo for 30 months were randomized 2:1 to tafamidis at 80 mg or 20 mg per day.
The primary endpoint in the long-term extension was a composite of all-cause mortality, heart transplantation, or implantation of a ventricular assist device. At a median follow-up of 39 months since ATTR-ACT began, the high-dose tafamidis group had an adjusted 33% reduction in the risk of this endpoint, compared with patients on 20 mg per day, a difference that barely missed statistical significance. At that point, everyone in the long-term extension was switched to the once-daily 61-mg formulation of tafamidis free acid, which is bioequivalent to four 20-mg capsules of tafamidis.
Dr. Damy’s key message: At a median of 51 months of follow-up, the group originally on 80 mg of tafamidis displayed a highly significant adjusted 43% reduction in risk of the composite endpoint, compared with those who had been on 20 mg per day.
Session chair Petar M. Seferovic, MD, PhD, pronounced the ATTR-ACT trial and its long-term extension “a breakthrough advancement.”
“This is the first time in human medical history that we have a drug which improves the long-term outcome, including survival, in patients with this form of hypertrophic cardiomyopathy. So this is extremely important. It’s one of the major steps forward in the treatment of patients with myocardial disease,” said Dr. Seferovic, president of the European Society of Cardiology Heart Failure Association and professor of internal medicine at the University of Belgrade, Serbia.
Discussant Loreena Hill, PhD, of Queen’s University in Belfast, Northern Ireland, observed that TAC is a devastating disease with a formidable symptom burden and an average survival of just 2-5 years after diagnosis.
“It is often underdiagnosed, and yet it is estimated to account for up to 13% of patients with heart failure and preserved ejection fraction,” she said, adding that she considers the long-term extension results “extremely positive.”
Nailing down the prevalence of hereditary TAC: the DISCOVERY study
TAC occurs when transthyretin, a transport protein, becomes destabilized and misfolds, promoting deposition of amyloid fibrils in the myocardium and elsewhere. In the heart, the result is progressive ventricular wall thickening and stiffness, manifest as restrictive cardiomyopathy and progressive nonischemic heart failure. The cause of transthyretin destabilization can be either autosomal dominant inheritance of any of more than 100 pathogenic mutations in the transthyretin gene identified to date or a spontaneous wild-type protein.
Dr. Damy was a coinvestigator in the recently published multicenter DISCOVERY study, in which 1,001 patients with clinically suspected cardiac amyloidosis, the great majority of them from the United States, were screened for pathogenic transthyretin genetic mutations. The overall prevalence of such mutations was 8% in the American patients, with the Val122Ile mutation being identified in 11% of African Americans (Amyloid. 2020 May 26;1-8).
The prevalence of wild-type amyloidosis causing TAC hasn’t yet been studied with anything approaching the rigor of DISCOVERY, but the available evidence suggests the wild-type version is roughly as common as the hereditary forms.
Although DISCOVERY and other studies indicate that TAC is far more common than generally realized, Pfizer has priced Vyndaqel and Vyndamax as though TAC is a rare disease, with a U.S. list price of around $225,000 per year.
“Obviously, the cost will go down over time,” Dr. Seferovic predicted.
Diagnosing TAC
Audience members mostly wanted to know how to identify individuals with TAC who are buried within the huge population of patients with heart failure with preserved ejection fraction. Dr. Damy said it’s actually a simple matter using a screening framework developed by an 11-member TAC expert panel on which he served. A definitive diagnosis can usually be achieved noninvasively at a low cost using bone scintigraphy, he added.
The panel recommended screening via bone scintigraphy in patients with an increased left ventricular wall thickness of 14 mm or more in men over age 65 and women older than 70 who either have heart failure or red flag symptoms.
These red flags for TAC include an echocardiographic finding of reduced longitudinal strain with relative apical sparing, a discrepancy between left ventricular wall thickness on imaging and normal or low-normal voltages on a standard 12-lead ECG, diffuse gadolinium enhancement or marked extracellular volume expansion on cardiac magnetic resonance imaging, a history of bilateral carpal tunnel syndrome, symptoms of polyneuropathy, and mildly increased serum troponin levels on multiple occasions (JACC Heart Fail. 2019 Aug;7[8]:709-16).
Dr. Damy reported receiving institutional research grant support from Pfizer, the study sponsor, and serving on a scientific advisory board for the company.
Treatment with oral tafamidis at 80 mg/day provided a significantly greater survival benefit than dosing at 20 mg/day in patients with transthyretin amyloid cardiomyopathy in the long-term extension of the landmark ATTR-ACT trial, Thibaud Damy, MD, PhD, reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
Moreover, the superior survival benefit achieved by taking four 20-mg capsules of tafamidis (Vyndaqel) once daily – or its more convenient once-daily, single-capsule, 61-mg bioequivalent formulation marketed as Vyndamax – came at no cost in terms of side effects and toxicity, compared with low-dose therapy for this progressive multisystem disease, according to Dr. Damy, professor of cardiology at the University of Paris and head of the French National Referral Center for Cardiac Amyloidosis at Henri Mondor University Hospital, Créteil, France.
“There are no side effects with tafamidis,” he said. “It doesn’t act on any receptors, it just acts on the formation of amyloid fibrils, so there are no side effects at whatever dosage is used. And in ATTR-ACT there was actually a trend towards increased side effects in the placebo group because the amyloidosis is everywhere, so by decreasing the amyloidosis process you improve not only the heart but all the organs, and the patient has a better quality of life.”
ATTR-ACT (Transthyretin Amyloidosis Cardiomyopathy Clinical Trial) was a phase 3, double-blind study in which 441 patients with transthyretin amyloidosis cardiomyopathy (TAC) in 13 countries were randomized to tafamidis at either 80 mg or 20 mg per day or placebo and followed prospectively for 30 months. At 30 months, all-cause mortality was 29.5% in patients who received tafamidis, compared with 42.9% in controls, for a statistically significant and clinically important 30% relative risk reduction, establishing tafamidis as the first disease-modifying therapy for this disease (N Engl J Med. 2018 Sep 13;379[11]:1007-16).
Patients in the 80-mg group had a 20% reduction in the risk of death, compared with the 20-mg group, at 30 months in an analysis adjusted for baseline age, 6-minute walk distance, and N-terminal pro-B-type natriuretic peptide, all of which are known to impact survival in TAC. This between-group survival difference wasn’t statistically significant, providing one impetus for the subsequent long-term extension study, in which patients remained on their original dose of tafamidis, and the controls who’d been on placebo for 30 months were randomized 2:1 to tafamidis at 80 mg or 20 mg per day.
The primary endpoint in the long-term extension was a composite of all-cause mortality, heart transplantation, or implantation of a ventricular assist device. At a median follow-up of 39 months since ATTR-ACT began, the high-dose tafamidis group had an adjusted 33% reduction in the risk of this endpoint, compared with patients on 20 mg per day, a difference that barely missed statistical significance. At that point, everyone in the long-term extension was switched to the once-daily 61-mg formulation of tafamidis free acid, which is bioequivalent to four 20-mg capsules of tafamidis.
Dr. Damy’s key message: At a median of 51 months of follow-up, the group originally on 80 mg of tafamidis displayed a highly significant adjusted 43% reduction in risk of the composite endpoint, compared with those who had been on 20 mg per day.
Session chair Petar M. Seferovic, MD, PhD, pronounced the ATTR-ACT trial and its long-term extension “a breakthrough advancement.”
“This is the first time in human medical history that we have a drug which improves the long-term outcome, including survival, in patients with this form of hypertrophic cardiomyopathy. So this is extremely important. It’s one of the major steps forward in the treatment of patients with myocardial disease,” said Dr. Seferovic, president of the European Society of Cardiology Heart Failure Association and professor of internal medicine at the University of Belgrade, Serbia.
Discussant Loreena Hill, PhD, of Queen’s University in Belfast, Northern Ireland, observed that TAC is a devastating disease with a formidable symptom burden and an average survival of just 2-5 years after diagnosis.
“It is often underdiagnosed, and yet it is estimated to account for up to 13% of patients with heart failure and preserved ejection fraction,” she said, adding that she considers the long-term extension results “extremely positive.”
Nailing down the prevalence of hereditary TAC: the DISCOVERY study
TAC occurs when transthyretin, a transport protein, becomes destabilized and misfolds, promoting deposition of amyloid fibrils in the myocardium and elsewhere. In the heart, the result is progressive ventricular wall thickening and stiffness, manifest as restrictive cardiomyopathy and progressive nonischemic heart failure. The cause of transthyretin destabilization can be either autosomal dominant inheritance of any of more than 100 pathogenic mutations in the transthyretin gene identified to date or a spontaneous wild-type protein.
Dr. Damy was a coinvestigator in the recently published multicenter DISCOVERY study, in which 1,001 patients with clinically suspected cardiac amyloidosis, the great majority of them from the United States, were screened for pathogenic transthyretin genetic mutations. The overall prevalence of such mutations was 8% in the American patients, with the Val122Ile mutation being identified in 11% of African Americans (Amyloid. 2020 May 26;1-8).
The prevalence of wild-type amyloidosis causing TAC hasn’t yet been studied with anything approaching the rigor of DISCOVERY, but the available evidence suggests the wild-type version is roughly as common as the hereditary forms.
Although DISCOVERY and other studies indicate that TAC is far more common than generally realized, Pfizer has priced Vyndaqel and Vyndamax as though TAC is a rare disease, with a U.S. list price of around $225,000 per year.
“Obviously, the cost will go down over time,” Dr. Seferovic predicted.
Diagnosing TAC
Audience members mostly wanted to know how to identify individuals with TAC who are buried within the huge population of patients with heart failure with preserved ejection fraction. Dr. Damy said it’s actually a simple matter using a screening framework developed by an 11-member TAC expert panel on which he served. A definitive diagnosis can usually be achieved noninvasively at a low cost using bone scintigraphy, he added.
The panel recommended screening via bone scintigraphy in patients with an increased left ventricular wall thickness of 14 mm or more in men over age 65 and women older than 70 who either have heart failure or red flag symptoms.
These red flags for TAC include an echocardiographic finding of reduced longitudinal strain with relative apical sparing, a discrepancy between left ventricular wall thickness on imaging and normal or low-normal voltages on a standard 12-lead ECG, diffuse gadolinium enhancement or marked extracellular volume expansion on cardiac magnetic resonance imaging, a history of bilateral carpal tunnel syndrome, symptoms of polyneuropathy, and mildly increased serum troponin levels on multiple occasions (JACC Heart Fail. 2019 Aug;7[8]:709-16).
Dr. Damy reported receiving institutional research grant support from Pfizer, the study sponsor, and serving on a scientific advisory board for the company.
Treatment with oral tafamidis at 80 mg/day provided a significantly greater survival benefit than dosing at 20 mg/day in patients with transthyretin amyloid cardiomyopathy in the long-term extension of the landmark ATTR-ACT trial, Thibaud Damy, MD, PhD, reported at the European Society of Cardiology Heart Failure Discoveries virtual meeting.
Moreover, the superior survival benefit achieved by taking four 20-mg capsules of tafamidis (Vyndaqel) once daily – or its more convenient once-daily, single-capsule, 61-mg bioequivalent formulation marketed as Vyndamax – came at no cost in terms of side effects and toxicity, compared with low-dose therapy for this progressive multisystem disease, according to Dr. Damy, professor of cardiology at the University of Paris and head of the French National Referral Center for Cardiac Amyloidosis at Henri Mondor University Hospital, Créteil, France.
“There are no side effects with tafamidis,” he said. “It doesn’t act on any receptors, it just acts on the formation of amyloid fibrils, so there are no side effects at whatever dosage is used. And in ATTR-ACT there was actually a trend towards increased side effects in the placebo group because the amyloidosis is everywhere, so by decreasing the amyloidosis process you improve not only the heart but all the organs, and the patient has a better quality of life.”
ATTR-ACT (Transthyretin Amyloidosis Cardiomyopathy Clinical Trial) was a phase 3, double-blind study in which 441 patients with transthyretin amyloidosis cardiomyopathy (TAC) in 13 countries were randomized to tafamidis at either 80 mg or 20 mg per day or placebo and followed prospectively for 30 months. At 30 months, all-cause mortality was 29.5% in patients who received tafamidis, compared with 42.9% in controls, for a statistically significant and clinically important 30% relative risk reduction, establishing tafamidis as the first disease-modifying therapy for this disease (N Engl J Med. 2018 Sep 13;379[11]:1007-16).
Patients in the 80-mg group had a 20% reduction in the risk of death, compared with the 20-mg group, at 30 months in an analysis adjusted for baseline age, 6-minute walk distance, and N-terminal pro-B-type natriuretic peptide, all of which are known to impact survival in TAC. This between-group survival difference wasn’t statistically significant, providing one impetus for the subsequent long-term extension study, in which patients remained on their original dose of tafamidis, and the controls who’d been on placebo for 30 months were randomized 2:1 to tafamidis at 80 mg or 20 mg per day.
The primary endpoint in the long-term extension was a composite of all-cause mortality, heart transplantation, or implantation of a ventricular assist device. At a median follow-up of 39 months since ATTR-ACT began, the high-dose tafamidis group had an adjusted 33% reduction in the risk of this endpoint, compared with patients on 20 mg per day, a difference that barely missed statistical significance. At that point, everyone in the long-term extension was switched to the once-daily 61-mg formulation of tafamidis free acid, which is bioequivalent to four 20-mg capsules of tafamidis.
Dr. Damy’s key message: At a median of 51 months of follow-up, the group originally on 80 mg of tafamidis displayed a highly significant adjusted 43% reduction in risk of the composite endpoint, compared with those who had been on 20 mg per day.
Session chair Petar M. Seferovic, MD, PhD, pronounced the ATTR-ACT trial and its long-term extension “a breakthrough advancement.”
“This is the first time in human medical history that we have a drug which improves the long-term outcome, including survival, in patients with this form of hypertrophic cardiomyopathy. So this is extremely important. It’s one of the major steps forward in the treatment of patients with myocardial disease,” said Dr. Seferovic, president of the European Society of Cardiology Heart Failure Association and professor of internal medicine at the University of Belgrade, Serbia.
Discussant Loreena Hill, PhD, of Queen’s University in Belfast, Northern Ireland, observed that TAC is a devastating disease with a formidable symptom burden and an average survival of just 2-5 years after diagnosis.
“It is often underdiagnosed, and yet it is estimated to account for up to 13% of patients with heart failure and preserved ejection fraction,” she said, adding that she considers the long-term extension results “extremely positive.”
Nailing down the prevalence of hereditary TAC: the DISCOVERY study
TAC occurs when transthyretin, a transport protein, becomes destabilized and misfolds, promoting deposition of amyloid fibrils in the myocardium and elsewhere. In the heart, the result is progressive ventricular wall thickening and stiffness, manifest as restrictive cardiomyopathy and progressive nonischemic heart failure. The cause of transthyretin destabilization can be either autosomal dominant inheritance of any of more than 100 pathogenic mutations in the transthyretin gene identified to date or a spontaneous wild-type protein.
Dr. Damy was a coinvestigator in the recently published multicenter DISCOVERY study, in which 1,001 patients with clinically suspected cardiac amyloidosis, the great majority of them from the United States, were screened for pathogenic transthyretin genetic mutations. The overall prevalence of such mutations was 8% in the American patients, with the Val122Ile mutation being identified in 11% of African Americans (Amyloid. 2020 May 26;1-8).
The prevalence of wild-type amyloidosis causing TAC hasn’t yet been studied with anything approaching the rigor of DISCOVERY, but the available evidence suggests the wild-type version is roughly as common as the hereditary forms.
Although DISCOVERY and other studies indicate that TAC is far more common than generally realized, Pfizer has priced Vyndaqel and Vyndamax as though TAC is a rare disease, with a U.S. list price of around $225,000 per year.
“Obviously, the cost will go down over time,” Dr. Seferovic predicted.
Diagnosing TAC
Audience members mostly wanted to know how to identify individuals with TAC who are buried within the huge population of patients with heart failure with preserved ejection fraction. Dr. Damy said it’s actually a simple matter using a screening framework developed by an 11-member TAC expert panel on which he served. A definitive diagnosis can usually be achieved noninvasively at a low cost using bone scintigraphy, he added.
The panel recommended screening via bone scintigraphy in patients with an increased left ventricular wall thickness of 14 mm or more in men over age 65 and women older than 70 who either have heart failure or red flag symptoms.
These red flags for TAC include an echocardiographic finding of reduced longitudinal strain with relative apical sparing, a discrepancy between left ventricular wall thickness on imaging and normal or low-normal voltages on a standard 12-lead ECG, diffuse gadolinium enhancement or marked extracellular volume expansion on cardiac magnetic resonance imaging, a history of bilateral carpal tunnel syndrome, symptoms of polyneuropathy, and mildly increased serum troponin levels on multiple occasions (JACC Heart Fail. 2019 Aug;7[8]:709-16).
Dr. Damy reported receiving institutional research grant support from Pfizer, the study sponsor, and serving on a scientific advisory board for the company.
FROM ESC HEART FAILURE 2020