USMLE Step 2 - Question 5

A 22 year old college student with no prior past medical history presents to the emergency room with complaints of palpiations and dizziness. He states he was at a party recently and had been drinking heavily when he noted the symptoms. No chest pains or shortness of breat. His blood pressure is 90/60, heart rate 160, respirations 20, and oxygen saturation 95% on room air. A portion of his ECG is below. What is his most likely diagnosis?


A. Multifocal atrial tachycardia

B. Ventricular tachycardia

C. Atrial fibrillation

D. Atrial flutter