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Papillary muscle rupture is a rare but severe complication of acute myocardial infarction. Two cases successfully underwent mitral valve replacement and concomitant coronary artery bypass grafting (CABG) for acute myocardial infarction with the anterior papillary muscle rupture in cardiogenic shock. Each of them needed preoperative massive inotropic infusion, respiratory support and intraaortic balloon pumping assist. The first case was a 76-year-old female. Double vessel disease (seg 7 : 90%, seg 11 : 100%) was revealed by coronary angiography and rupture of the papillary muscle was confirmed by transesophageal echocardiography. The second case was a 69-year-old female. Double vessel disease (seg 2 : 90%, seg 11 : 100%) was revealed and severe mitral regurgitation due to prolapse of the anterior leaflet was confirmed by transthoracic echocardiography. To assess the diagnosis of postinfarction papillary muscle rupture, transthoracic and/or transesophageal echocardiography is mandatory. Coronary angiography is also desirable because concomitant myocardial revascularization may improve the prognosis.
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