A 63 year-old, previously healthy, male presents 5 hours aft…

A 63 year-old, previously healthy, male presents 5 hours after a 5-minute episode of exertional substernal chest pressure relieved by rest and one of his brother’s nitroglycerin tablets.  He had associated shortness of breath but no diaphoresis.  It was his first episode and the patient has no past medical history of cardiac problems.  In the emergency room, the heart and lung exams, serial EKG and cardiac enzymes are within normal limits.  Which of the following tests would be best at evaluating his symptoms further?

A 57 year-old male presents for a visit to his primary care…

A 57 year-old male presents for a visit to his primary care physician. He is s/p MI 2 years ago but complains of chest pain 1-2 times a month. He has needed 15 nitroglycerin tablets to control the chest pain in the past week. Which of the following conditions should be highest on the differential diagnosis for this patient?