- Patients with the first ST-segment elevation acute anterior myocardial infarction due to occlusion of the proximal left anterior ascending coronary artery (LAD), who will underwent successful primary stented PCI. Patients are eligible if they have primary PCI from 4 to 12 hours after symptoms onset and show reduced LV ejection fraction ≤ 45% with at least 3 akinetic segments in the LAD perfusion territory at echocardiogram performed 24 hours after PCI.