Patients with acute coronary syndrome fall into two groups: those with unstable angina or non—ST segment elevation (formerly non—Q wave) myocardial infarction (NSTEMI) and those with acute ST segment elevation (formerly Q wave) myocardial infarction (STEMI). STEMI is the focus of this chapter. The epidemiology, pathophysiology, diagnosis, differential diagnosis, and complications of STEMI are elaborated. Reperfusion therapy (including time to reperfusion; diagnostic coronary angiography; primary, facilitated, rescue, and late percutaneous coronary intervention [PCI]; thrombolytic therapy and choice of thrombolytic agent; early invasive strategy; coronary artery bypass grafting; and therapeutic hypothermia), medical therapy (including aspirin, P2Y12 inhibitors, glycoprotein IIb/IIIa inhibitors, anticoagulants, nitrates, beta blockers, inhibition of the renin-angiotensin-aldosterone system, oxygen, analgesia, lipid-lowering therapy, prophylactic antiarrhythmics, and magnesium), risk stratification, secondary prevention, and post-STEMI care are also covered. Tables delineate classifications of MI as defined by proximal cause of myocardial ischemia, Killip classification of acute MI an
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