A 34-year-old man with a history of atrioventricular (AV) nodal reentrant tachycardia and treated with a beta-blocker and verapamil presents to the emergency department with fatigue and a slow heart rate. A 12-lead ECG is obtained.

Figure 1.
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Cite this: ECG Challenge: A Cardiac Patient With Slow Heartbeat and Fatigue - Medscape - May 24, 2022.
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