Effect of trimetazidine on late potentials after acute myocardial infarction

The purpose of this study was to evaluate the effect of trimetazidine on la te potentials in patients with acute myocardial infarction. A total of 60 p atients (52 males, mean age 55 +/- 2 years, and 8 females, mean age 54 +/- 1.8 years) with the diagnosis of acute myocardial infarction were included in this study. The study was designed as a randomized, double-blinded, and placebo-controlled trial. Signal-averaged electrocardiography and echocardi ography were performed during the first 2 days of acute myocardial infarcti on and were repeated between days of 8 and 15 (mean 11). Patients were trea ted with trimetazidine (n = 30) or placebo (n = 30). In the placebo group, the total filtered QRS duration and low-amplitude terminal signal duration increased (from 102.7 +/- 1.8 ms to 113.3 +/- 1.8 ms, and from 32.2 +/- 0.9 ms to 38.3 +/- 1.1 ms; P < 0.001), the root mean square voltage of the ter minal 40 ms of the QRS decreased (from 28.6 +/- 2.1 mu V to 21.4 +/- 1.3 mu V; P < 0.001), and the incidence of late potentials increased (from 30% to 46%; P < 0.01) significantly. In the trimetazidine group, these measuremen ts were a decrease from 102.9 +/- 1.9 ms to 100 +/- 2.0 ms (NS), an increas e from 31.6 +/- 0.9 ms to 32.5 +/- 0.9 ms (NS), a decrease 9.3 +/- 2.0 mu V to 27.3 +/- 1.8 mu V (P < 0.01), and a decrease from 33% to 30% (NS), resp ectively. The ejection fraction was 47.1 +/- 1.3% to 50.8 +/- 1.2% in the p lacebo group (P = 0.05), and 48.1 +/- 1.1% to 53.4 +/- 1.2% (P < 0.01) in t he trimetazidine group. It is concluded that trimetazidine reduces late pot entials after acute myocardial infarction without changing blood pressure a nd heart rate.