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Overview

Acute coronary syndromes refer to any constellation of clinical symptoms compatible with acute myocardial ischemia usually caused by sudden reduction in coronary blood flow.
It encompasses unstable angina, non-ST-segment elevation myocardial infarction (NSTEMI) and ST-segment elevation myocardial infarction (STEMI).
Unstable angina is the ischemic discomfort that presents without persistent ST-segment elevation on ECG and with normal cardiac biomarkers in the blood.
NSTEMI presents with elevated levels of cardiac biomarkers.
The patient typically presents with ischemic-type chest pain that is severe and prolonged and may occur at rest or may be caused by less exertion than previous episodes