The aim of this international study is to describe the short- and long-term (i.e. up to 2 years following the index event) antithrombotic management patterns (AMPs) in patients hospitalized for acute coronary syndromes (ST segment elevation myocardial infarction (STEMI), Non-ST-Segment Elevation Acute Coronary Syndrome (NSTE-ACS)), and to document the impact of AMPs in clinical outcomes, economic variables and quality of life in a 'real-life' setting and to compare these between sites, countries and regions.

Inclusion Criteria:

• Diagnosis of myocardial infarction or unstable angina
• Hospitalized for the first time within 24 hours of onset of symptoms

Exclusion Criteria:

• Presence of any condition/circumstance which in the opinion of the investigator could significantly limit the complete follow up of the patient (e.g. tourist, non-native speaker or does not understand the local language, psychiatric disturbances)
• Current participation in a clinical trial.

Patients hospitalized within 24 hours of onset of symptoms and diagnosed with unstable angina (UA), STEMI or non-STEMI(NSTEMI). Patients will be invited to participate by the hospital (Academic or Community) which is going to discharge the patient.

Participating investigators will belong to hospitals (Academic, Community, with/without cathlab, etc), in the proportion representing the reality of where this kind of patients are managed in each country.