Objectives, end points and definitions The primary objective of PREDICT-VT trial is to test the hypothesis that the occurrence of ventricular tachyarrhythmias (VTA) and sudden cardiac death (SCD) is predictable with acceptable accuracy among STEMI patients undergoing PPCI. Therefore, the PREDICT-VT specified primary end point is the analysis of independent predictors of VTA and SCD in a period of 3-40 days following STEMI. The second objective of the study is the stratification of risk for VTA by constructing optimal predictive models and defining the classes of risk. The third objective of the study is a validation of the model using an independent sample of patients. The study's subanalyses will include: a. Analysis of the significance of non-sustained VTA lasting <30 seconds for the prognosis of patients with STEMI, b. Importance of frequent ventricular premature beats and/or emerging atrial fibrillation for the prognosis of patients and the emergence of SCD, c. Definition of risk factors for the occurrence of VTA in the subgroup of patients with preserved left ventricular ejection fraction (LVEF), considering that more than half of the SCD victims have preserved LVEF.