MACE to evaluate during Follow-up will be: Reinfarction, myocardial ischemia, heart failure, electrocardiographic complications and / or death (mortality). 8 tertiary care hospitals or Medical Units of High Specialty (UMAES for its acronym in Spanish) will participated representing the country: an analysis of clinical and paraclinical variables contained in the record considered as relevant in predicting the inception cohort for MACE during hospitalization and 30 days will be done. The cohort of major cardiovascular events (as previously defined) will be compared with the cohort comprised by patients without such events.