Review Question - QID 214292

A 24-year-old man presents to the emergency department for palpitations. His girlfriend recently broke up with him, which he believes is causing his symptoms. He also states that he feels short of breath. The patient is given a small dose of lorazepam, and his symptoms resolve. He is otherwise healthy, does not smoke, and occasionally goes for walks. His temperature is 97.9°F (36.6°C), blood pressure is 124/84 mmHg, pulse is 80/min, respirations are 12/min, and oxygen saturation is 98% on room air. Physical exam is notable for a systolic murmur heard along the left sternal border. An ECG is performed as seen in Figure A. Which of the following is most likely to occur in this patient?