REWINDER is a multinational, multicentre, non-interventional, retrospective study of patients treated with an oral antiplatelet (ticagrelor, prasugrel or clopidogrel) while in hospital after an ACS event, to be conducted in Belgium and Luxembourg. Primary objective is to evaluate the actual treatment persistence with OAPs after an ACS in the clinical practice in Belgium and Luxembourg. The main secondary objectives are to describe the most frequent reasons for OAP treatment switch, discontinuation or reinitiation; to identify the decisionmakers in the OAP treatment changes and to characterize the patient profile in terms of demographics, diagnosis, management strategies, comorbidities and concomitant medications to identify any association between patient profile and treatment duration.