Definition of ACS
Acute coronary syndromes (ACS) include unstable angina and acute myocardial infarction (AMI). AMI is classified according to those patients with electrocardiographic ST-segment elevation, ST-elevation myocardial infarction (STEMI) and those without electrocardiographic ST-segment elevation, non-ST-elevation myocardial infarction (NSTEMI).1 The requirement for a diagnosis of AMI in the universal definition is the detection of troponin release from injured cardiac myocytes with at least one value >99th centile of the upper reference limit.1 Diagnosis is confirmed only if this is associated with at least one of: symptoms of