Echocardiographic evaluation will be obtained on day 7 and at follow up (6 months). Regional wall motion (WM) will be semiquantitatively scored by 2 experienced blinded observers according to the recommendations of the American Society of Echocardiography (1 = normal, 2 = hypokinesia, 3 = akinesia, 4 = dyskinesia) and a wall motion score index (WMSI) will be calculated by the sum of the score of all segments divided by the total number of segments. Left ventricular (LV) volumes will be calculated by the modified Simpson biplane method. Endocardial length of severe WM abnormality (WM score = 3) (WML) and of transmural contrast defect (CD score = 3) (CDL) will be calculated in each apical view, averaged, and expressed as a percentage of LV length.