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“The European guidelines are closely related to the study population enrolled in the PARADIGM-HF trial,” the pivotal trial that showed superiority of sacubitril/valsartan to an ACE inhibitor (N Engl J Med. 2014;371:993-1004), noted Dr. Butler in an interview. “The U.S. guidelines interpreted [the PARADIGM-HF] results in the best interests of a larger patient population. The European guidelines are far more proscriptive in replicating the clinical criteria of the trial. In some patients the sequence of starting a MRA and sacubitril/valsartan matters, but in other patients it is less important.”
Dr. Frank Ruschitzka, a coauthor of the ESC guidelines, said that the reason for the more cautious ESC approach was lack of widespread familiarity with sacubitril/valsartan treatment among cardiologists.
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Dr. Frank Ruschitzka
The ESC guidelines on using sacubitril/valsartan “replicated the PARADIGM-HF trial. We have no data right now that it is justifiable to put a [treatment-naive] patient on sacubitril/valsartan to begin with. Another difference between the U.S. and ESC guidelines is when to start a MRA,” said Dr. Ruschitzka, professor and head of cardiology at the Heart Center of the University Hospital in Zurich. “It makes a lot of sense to me to start sacubitril/valsartan early. The PARADIGM trial was positive, but no one has a feel for how to use sacubitril/valsartan. Should we give it to everyone? We said replicate the trial, and gain experience using the drug. We want to bring a life-saving drug to patients, but this is the approach we took. We need more data.”
Dr. Jessup noted that a lot of uncertainty also exists among U.S. clinicians about when to start sacubitril/valsartan. “It’s not been clear which patients to put on sacubitril/valsartan. No guidelines had been out on using it” until mid-May, and “the cost of sacubitril/valsartan is daunting. I have received calls from many people who ask whom am I supposed to use sacubitril/valsartan on? It took years and years to get people to [routinely] start patients on an ACE inhibitor and a beta-blocker, and now we’re telling them to do something else. In my practice it’s a 30-minute conversation with each patient that you need to first stop your ACE inhibitor, and then they often get denied coverage by their insurer,” said Dr. Jessup, professor of medicine at the University of Pennsylvania in Philadelphia. She expressed hope that coverage issues will diminish now that clear guidelines are out endorsing a key role for sacubitril/valsartan.
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Dr. JoAnn Lindenfeld
“We now all have started sacubitril/valsartan on patients” without first starting them on an ACE inhibitor, “but we all need to get a sense of what we can get away with” when using this drug, noted Dr. JoAnn Lindenfeld, professor and director of heart failure and transplant at Vanderbilt University in Nashville.
At least one European cardiologist was skeptical of just how proscriptive the ESC guideline for sacubitril/valsartan will be in actual practice.
“The best treatment [for symptomatic HFrEF] is sacubitril/valsartan, a beta-blocker, and a MRA,” said Dr. John J.V. McMurray, professor of cardiology at Glasgow University and lead investigator for the PARADIGM-HF pivotal trial for sacubitril/valsartan. “The treatment sequence advocated in the guidelines – treat with an ACE inhibitor first and if patients remain symptomatic change to sacubitril/valsartan – is evidence-based medicine. As a guidelines writer and as a promoter of evidence-based medicine, this is absolutely the correct approach. But as a practicing physician I’d go straight for sacubitril/valsartan. Otherwise you’re wasting everybody’s time starting with an ACE inhibitor and then waiting a month to switch,” Dr. McMurray said in an interview.
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Dr. John J.V. McMurray
“It’s pointless to wait. We saw results within 30 days of starting sacubitril/valsartan, so it’s a theoretical risk to wait. Very few patients will become completely asymptomatic on an ACE inhibitor. Everyone who entered PARADIGM-HF was at New York Heart Association class II or higher, and at the time of randomization only a handful of patients were in New York Heart Association class I. Very few patients get to class I. That tells you it’s pretty uncommon for a heart failure patient to become truly asymptomatic with ACE inhibitor treatment. The main problem is that you are inconveniencing everybody with more blood tests and more clinic visits by waiting to start sacubitril/valsartan, said Dr. McMurray, who was not a member of the panel that wrote the new ESC guidelines.
Even less separates the new U.S. focused update and the ESC guidelines for using ivabradine. Both agree on starting the drug on HFrEF patients who remain symptomatic and with a left ventricular ejection fraction of 35% or less despite being on guideline-directed therapy including titration to a maximum beta-blocker dosage and with a persistent heart rate of at least 70 beats/min. The goal of ivabradine treatment is to further reduce heart rate beyond what’s achieved by a maximal beta-blocker dosage.