MSFinals-0347

MSFinals-0347

A 47-year-old woman is admitted with central chest pain of 18 hours’ duration and shortness of breath. Her troponin is elevated, and her electrocardiogram (ECG) shows changes in leads V2–V6. While undergoing initial management in preparation for primary percutaneous coronary intervention (primary PCI), she deteriorates suddenly and goes into cardiac arrest. Efforts to resuscitate her are unsuccessful. At post-mortem, rupture of the left ventricular cardiac wall is evident at the apex.
Which is the most likely blood vessel to have been involved in the infarct?