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The patient is a 60-year-old male presenting with dyspnea and cough but denies chest pain. PE findings include tachycardia, tachypnea, friction rub, narrowed pulse pressure, and Beck's triad. An EKG is performed and shows electrical alternans. What is the diagnosis?a. Pericarditisb. Dilated cardiomyopathyc. Pericardial tamponaded. MI
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