A 45-year-old man is brought to the Emergency Department with chest pain. He has no significant medical history. He is anxious and agitated, and he reports severe central chest pain that began about 90 minutes ago. His vital signs are as follows: blood pressure 200/110 mm Hg, heart rate 140/min, respiratory rate 30/min, oxygen saturation 98% on supplemental oxygen. Physical examination reveals a restless and slightly tremulous man. Pupils are 7 mm reactive. There are no focal neurologic signs. Cardiopulmonary examination is normal. The 12-lead electrocardiogram reveals sinus tachycardia; findings are otherwise normal. Which one of the following is the most likely cause of this clinical presentation?
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