system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 59-year-old male presents to the emergency room with shortness of breath. Ten days ago, he was in the cardiac critical care unit after receiving a balloon angioplasty and a bare metal stent for an ST-elevation myocardial infarction (STEMI). On physical examination, a holosystolic murmur is heard at the cardiac apex radiating to the axilla. You also detect an S3 and bilateral crackles in the lung bases. What is the most likely etiology of this patient's acute decompensated heart failure?
assistant
Rupture of the posteromedial papillary muscle of the left ventricle