Primary endpoint will be left ventricular function evolution evaluated by global longitudinal strain (GLS, 2D speckles tracking) in TTE. Secondary endpoints will be left and right ventricular function parameters: LEVF by TTE and MRI, left ventricular indexed volumes by TTE and MRI, right ejection ventricular function and indexed volumes by TTE and MRI, systolic pulmonary arterial pressure by TTE, serum troponin I and BNP, arrhythmias and conduction disorders on the electrocardiogram (ECG).