Review Question - QID 212412

A 55-year-old man with a past medical history of diabetes and hypertension presents to the emergency department with crushing substernal chest pain. He was given aspirin and nitroglycerin en route and states that his pain is currently a 2/10. The patient’s initial echocardiogram (ECG) is within normal limits, and his first set of cardiac troponins is 0.10 ng/mL (reference range < 0.10 ng/mL). The patient is sent to the observation unit. The patient is given dipyridamole, which causes his chest pain to recur. Which of the following is the most likely etiology of this patient’s current symptoms?