Objective Systolic Function Recuperation Assessed by Echocardiography

Inclusion Criteria: * Older than 18 years old * ST elevation myocardial infarction treated with primary PCI * Anterior or apical akinesis and left ventricular ejection fraction ≤ 45% on early echocardiography (48hours - 7 days post myocardial infarction) * Initial ECG showing at least 1 mm ST elevation in 2 leads corresponding to the same vascular territory Exclusion Criteria: * Known left ventricular systolic dysfunction before myocardial infarction * Left bundle branch block * Vital prognosis less than 6 months * Cardiogenic shock * Rescue PCI * Sub-optimal echocardiographic imaging (contrast use is allowed) * Significant valvular heart disease (moderate or severe) * Surgical revascularization * Pregnancy or breastfeeding * Incapacity to provide informed consent