Male and female patients from Belgium and Luxembourg, aged 18 years or more , discharged alive from hospital to home following an acute coronary syndrome (ACS) and who were treated with an oral antiplatelet (OAP) (ticagrelor, prasugrel or clopidogrel) after an acute coronary syndrome (ACS) event (Unstable Angina (UA), ST-elevation myocardial infarction (STEMI) or non-STEMI(NSTEMI)).