Background and Objectives：There is increasing evidence to suggest that trimetazidine (TMZ) has the ability to improve ischemic heart failure by way of optimizing the heart''s energy metabolism. The aim of this study was to examine the changes of the myocardial enhancement pattern by using two-phase, contrast enhanced, ECG-gated, multi-detector computed tomography (MDCT) after the administration of TMZ in a porcine myocardial infarction model. Subjects and Methods：The porcine myocardial infarction model was created by balloon occlusion of the left anterior descending coronary artery. We randomized the swine into two groups: group I (n=7: aspirin only) and group II (n=7: aspirin plus 1 mg/kg TMZ for 4 weeks). Echocardiography and MDCT were performed and the ejection fraction (EF, %), end-systolic volume (ESV, mL) and end-diastolic volume (EDV, mL) were measured at 28 days after induction of myocardial infarction. Three enhancement patterns, including the early arterial phase defect (ED), the 4-min late enhancement (LE) and the residual defect (RD), were also investigated and those were described as class I [ED (-), RD (-), LE (±)], class II [ED (+), RD (-), LE (+)], and class III [ED (+), RD (+), LE (+)]. We performed histopathologic examination after sacrificing the animals.