Fatal myocardial embolus after myectomy.

Coronary embolism is an infrequent phenomenon. A 56-year-old man with hypertrophic obstructive cardiomyopathy and severe mitral regurgitation who underwent left ventricular septal myectomy and mitral valve annular repair is presented. The patient had a cardiac arrest 36 h after surgery. Cardiac standstill, tamponade and a left ventricular rupture were noted when the chest was opened during attempted resuscitation. Autopsy revealed an occlusive embolus of myocardium in the proximal left anterior descending coronary artery. It showed pathological features of hypertrophic cardiomyopathy. There was an extensive acute transmural anteroseptal left ventricular myocardial infarction with rupture of the anterior free wall. Embolism of myocardium - to the coronary arteries, the systemic circulation or the pulmonary circulation - is a rare event, with only nine other cases reported in the literature in the past 30 years. This is the first reported case of myocardial embolus to a coronary artery in a patient with hypertrophic obstructive cardiomyopathy following septal myectomy.