A 68-year-old man with a history of a low left ventricular ejection fraction and symptomatic bradycardia who is treated with a pacemaker presents to his primary care provider for a routine physical examination. His heart rate is noted to be regular and rapid. Physical examination is otherwise unremarkable. A 12-lead ECG is obtained.
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Cite this: ECG Challenge: Fast Heartbeat With a Pacemaker - Medscape - Jan 25, 2022.