Review Question - QID 212687

A 56-year-old woman comes to the emergency room for recurring chest pain lasting 1 day. The pain is described as sharp, 8/10, and concentrated at the left mid-chest region. Her past medical history is significant for hypertension controlled with lisinopril. Her father passed at the age of 59 from a heart attack, and she is worried that she might be having one right now. She denies fever, weight loss, diaphoresis, palpitations, dyspnea, or nausea, but endorses cough, rhinorrhea, and headache for the past week. A physical examination demonstrates a well-appearing woman with an unremarkable exam except for some tenderness upon palpation at the left chest. An electrocardiograph (ECG) is obtained and is shown in Figure A. What is the most likely explanation for this patient’s symptoms?