A 30-year-old man is brought to the emergency department due to chest palpitation and lightheadeness. He has no known medical conditions and takes no mediations. His pulse is 140/min and irregular. respiration is 17/min and blood pressure 118/72. Pulse oximetry on room air shows an oxygen saturation of 96%. Chest examination reveals no murmurs and the lungs are clear on auscultation. There is trace peripheral edema. Cardiac rhythm strip in the emergency department will show :

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Eductional Objective: Atrial fibrillation is the most common cause of an irregularly irregular rhythm and is detected on ECG by an absence of organized P waves and varying R-R intervals.

A 30-Year-Old Man Is Brought to the Emergency Department Due