USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A 62-year-old Caucasian woman comes to the office because of shortness of breath for the past six hours. She had a myocardial infarction five days ago, which was treated medically because she failed to come to the hospital in time for primary percutaneous coronary intervention. On cardiac auscultation, a high-pitched holosystolic murmur is heard at the apex, when she is lying on her left side. Coarse crackles are heard at the lung bases bilaterally on pulmonary auscultation. Which of the following muscles is most likely damaged?