Acute coronary syndromes (ACS) comprises patients with unstable angina pectoris, acute myocardial infarction without ST-elevation and those with myocardial infarction and persistent ST-elevation in order to clarify that there is sort of a continuum of increasing clinical symptoms and imperial evidence of increasing myocardial damage. The latter may not be diagnosed accurately by only interpreting ECG-changes but needs the determination of biochemical markers of myocardial necrosis such as Troponin T or I. This group of patients with ACS has been studied extensively during the last years in order to find out the optimal triage procedure, method of revascularisation, adjunctive treatment, and long term prevention.