Review Question - QID 213375

A 67-year-old man presents to the emergency department after an episode of syncope. It happened when he was doing yard work while lifting a heavy bag. Similar episodes have occurred in the past when he exerts himself. The patient is otherwise healthy and is not currently on any medications. His temperature is 98.3°F (36.8°C), blood pressure is 137/89 mmHg, pulse is 88/min, respirations are 14/min, and oxygen saturation is 99% on room air. Physical exam is notable for a delayed carotid pulse but is otherwise unremarkable. The patient is asked to walk around the emergency department, and after doing so he states he feels a little short of breath and dizzy. The patient’s initial ECG is seen in Figure A, and 2 sets of troponins are unremarkable. Which of the following is the best next step in management?