Review Question - QID 109672

A 55-year-old man presents to the emergency department with chest pain and shortness of breath. The patient states that he feels out of breath and that his heart is racing. He was on a transatlantic flight when his symptoms started. He has a past medical history of obesity, diabetes, and hypertension. His current medications include lisinopril, atorvastatin, insulin, and metformin. His temperature is 99.5°F (37.5°C), blood pressure is 197/108 mmHg, pulse is 160/min, respirations are 17/min, and oxygen saturation is 98% on room air. An ECG is obtained as seen in Figure A. A CT pulmonary angiogram is demonstrated in Figures B and C. Which of the following is the most likely diagnosis?