When it comes to medical therapy after a coronary revascularization procedure, more is better. Patients started and then maintained indefinitely on more rather than fewer of the drugs identified as optimal medical therapy (OMT) achieve a major survival benefit 10 years later, according to long-term follow-up from an extended analysis of the SYNTAX trial.
Courtesy Cardiovascular Research Foundation
Dr. Patrick Serruys
For the survival benefit at 10 years, “the present study suggests that at least three types of optimal medical therapy should be maintained for at least 5 years after revascularization,” reported a multinational team of cardiovascular specialists led by Hideyuki Kawashima, MD and Patrick Serruys, MD, who both have affiliations with the department of cardiology of the National University of Ireland, Galway.
The SYNTAX trial was conducted to compare percutaneous coronary intervention (PCI) with coronary artery bypass grafting (CABG) for patients with previously untreated three-vessel and/or left main disease (N Engl J Med 2009;360:961-72). The conclusion from that study, published in 2009 and subsequently reinforced by a 5-year follow-up, was that CABG should remain the standard of care for complex lesions.
Optimal medical therapy defined
In the course of SYNTAX, the impact of OMT on outcome was also evaluated in a subanalysis. At 5 years, there was a mortality advantage for those receiving an antiplatelet drug, a statin, a renin-angiotensin system inhibitor (ACE inhibitor or angiotensin receptor blocker), and a beta-blocker when compared with fewer of these agents.
When an investigator-initiated extension of SYNTAX, called SYNTAXES, was conducted to compare the outcomes of PCI and CABG at 10 years, it also permitted an extended analysis of OMT. Although the primary comparison of SYNTAXES, reported 2 years ago, did not show a significant difference between PCI and CABG for mortality at 10 years, there was a difference for OMT.
When investigators compared treatment with three or more OMT agents with that with two or fewer OMT drugs at 5 years, the result for all-cause death at 10 years translated into a more than 50% relative reduction (hazard ratio, 0.47; P = .002). The absolute difference in mortality was a more than 6% reduction (13.1% vs. 19.9%).
OMT data offer major message
The current study is considered to have a major message for patients as well as physicians.
“OMT even outweighs the survival benefit from revascularization alone, so our patients should convince themselves of the value of rigorous adherence and compliance,” Dr. Serruys said in an interview. According to him, these are compelling data for telling patients that OMT “is the best insurance for extended survival.” We now know from these data “the longer, the better.”
The same message from these data extends to physicians.
“I wish I could understand the apparent blind spot physicians have with respect to prescribing OMT despite the overwhelming benefit from multiple clinical trials,” said William E. Boden, MD, professor of medicine, Boston University.
Dr. Boden was a coauthor of an editorial accompanying the newly published SYNTAXES subanalysis. In the editorial, he noted that OMT following revascularization and in other high-risk patients “has been unacceptably low,” but he was asked to expand on the lessons from the newly released SYNTAXES subanalysis in an interview.
“There has often been a belief that revascularization negates the need for OMT and that’s why the SYNTAXES trial 10-year mortality reduction – which builds upon an earlier 5-year mortality reduction analysis – is so important,” he said.