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Background: Elevated heart rate in stable coronary artery disease (CAD) is associated with worse outcomes,\ud particularly increased risk of myocardial infarction. Heart rate reduction with the If inhibitor ivabradine confers symptomatic benefits in angina pectoris and reduces coronary events in patients with stable CAD and left ventricular (LV) systolic dysfunction, with a resting heart rate of ≥70 beats/min. The SIGNIFY trial is testing the hypothesis that heart rate reductionusing ivabradine reduces mortality and cardiovascular events in patients with stable CAD, but without clinical heart failure.\ud \ud
Methods: The SIGNIFY trial is a randomized, double-blind, parallel-group, placebo-controlled, event-driven study in\ud patients with stable CAD (1,139 centers, 51 countries). Participants are 55 years or older, with stable CAD and an LV ejection fraction N40%, in sinus rhythm, with a baseline resting heart rate of ≥70 beats/min, and with at least 1 additional cardiovascular risk factor. At inclusion, patients receive ivabradine 7.5 mg twice a day or matching placebo, which is adjusted at every visit to a heart rate target of 60 beats/min. Participants should receive the best possible background treatment for stable CAD. The primary end point is a composite of cardiovascular death or nonfatal myocardial infarction.\ud \ud
Results: Recruitment lasted from October 2009 to April 2012. The SIGNIFY trial has recruited 19,102 patients (age 65.0 ± 7.2years, resting heart rate 77.2 ± 7.0 beats/min, 72% male) with no evidence for LV dysfunction (ejection fraction 56.5% ± 8.6%).\ud \ud
Conclusion: The SIGNIFY trial will shed further light on the role of heart rate lowering with ivabradine in patients with stable CAD without clinical heart failure. The study is expected to end in 2014.