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A 67-year-old woman with no pertinent medical history presented to the emergency department with chest pain and signs of cardiac tamponade (muffled heart sounds, low blood pressure, and vasoconstriction). The electrocardiogram showed Q waves in leads II, III, and aVF. The creatine kinase concentration was 736 U per liter (normal reference range, 20 to 160 U per liter),
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