A 64-year-old man is brought to the emergency department for chest pain. An electrocardio- gram demonstrates an ST-elevation myocardial infarction in the posterior leads. After the initial management, he is admitted to the critical care unit for monitoring. On the fifth hospital day, he experiences a sudden onset of dyspnea and hypotension.
An echocardiogram shows severe mitral regurgitation. An occlusion in which vessel is responsible for these findings? (A) Left anterior descending artery (B) Left circumflex artery (C) Left marginal artery (D) Posterior descending artery (E) Right marginal artery
