Trimetazidine on ischemic injury and reperfusion in coronary artery bypass grafting.

BACKGROUND The ischemia and reperfusion ischemia is a common physiopathological mechanisms, which has difficult control during Coronary Artery Bypass Grafting (CABG) with cardiopulmonary bypass, the critical moment of which happening by the end of surgery, when there is declamping of aorta and release of hyperoxic radicals causing the injury. OBJECTIVE Evaluate, in a randomized double-blind prospective study, controlled with placebo, the effects of Trimetazidine (Tmz) on ischemic injury and myocardial reperfusion, identifying the change in plasma markers of a myocardial aggression (troponin T and CPK-MB), and echocardiographic changes of ventricular function. METHODS We studied 60 patients divided in two groups (placebo and Tmz) with mild ventricular dysfunction at the most, stratified by echocardiography and receiving medication/placebo at a dose of 20 mg/3 x/day, starting from 12 to 15 days after pre-operative period up to 5 to 8 days after post-operative period. Troponin T and Cpk-Mb were measured preoperatively without medication, 12 to 15 days of medication/placebo taken five minutes after aortic declamping, and at subsequent 12, 24 and 48 hours. RESULTS Both Troponin T and Cpk-Mb reached highly significant values (p = 0.0001) in the treated group compared to the control group at the four moments analyzed--5 min, 12 h, 24 h and 48 h. The echocardiographic variables did not show evolutive changes in each group severally considered and when compared among themselves. CONCLUSION Trimetazidine was effective in reducing ischemic injury and reperfusion, had no effect on left ventricular function, and no side effects were observed.