This case report from Brady Pregerson, MD, features a man in his early 70s presenting to the hospital with palpitations for the past 2 hours that started while playing a round of golf. Can you determine the most likely rhythm?
A patient in their early 70s presents to the hospital with palpitations for the past 2 hours that started while playing a round of golf. He feels dizzy, but denies vertigo, syncope, chest discomfort, leg swelling, fever, cough, or other complaints. He has no known medical history but does smoke tobacco.
Vital signs are normal except for tachycardia. The physical exam is otherwise normal with clear lungs, no leg edema, and no nystagmus.
What is the most likely rhythm in this patient?