Inclusion Criteria:  Subject must be >18 years of age Myocardial infarction with elevated ST Chest pain onset less than 12 hours before PCI concordant ST elevation (>0,1 mV) in at least 2 ECG leads Occluded main proximal or middle main coronary ('Thrombolysis In Myocardial Infarction' flow grade: 0) diagnosed with coronarography Coronary opened by PCI (TIMI 2 flow grade) Awake, conscious, co-operating patient, who is able to retain his breath for 10 sec Signed Patient Information Leaflet and Patient Informed Consent Form  Exclusion Criteria:  Cardiogenic shock Previous myocardial infarction in the area of the occluded coronary artery Occluded coronary with visible collateral branches Lack of co-operation Current left or right bundle branch block (LBBB) Malignant ventricle arrhythmia or atrial fibrillation Killip class > 2 Known renal failure