Acute coronary syndrome (ACS) can be divided into subgroups of ST-segment elevation myocardial infarction (STEMI), non-ST-segment elevation myocardial infarction (NSTEMI), and unstable angina. ACS carries significant morbidity and mortality and the prompt diagnosis, and appropriate treatment is essential. STEMI diagnosis and management are discussed elsewhere. NSTEMI and Unstable angina are very similar, with NSTEMI having positive cardiac biomarkers. The presentation, diagnosis, and management of NSTEMI are discussed below.
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