# Acute Coronary Syndrome --- **Acute coronary syndrome** or **ACS** a condition where someone experiences a sudden reduced flow of blood to the heart. It is typically caused by a cluster of conditions, the three main ones being an [[angina|unstable angina]], NSTEMI and STEMI [[myocardial infarction|MI]]. The precipitating event is usually a [[atherosclerosis|plaque]] rupturing or a clot lodging in the [[coronary circulation|coronary arteries]]. ___