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A 70-year old woman presented to the emergency department with fatigue and presyncopal episodes commencing two days earlier. The ECG recording revealed 2:1 atrioventricular block with periods of 3:2 Wenckebach conduction. The intracardiac electrograms during spontaneous sinus rhythm and atrial pacing are displayed below. Figure 1. Atrial pacing. His bundle recording is marked with a red dot. Figure 2. Recording during sinus rhythm. His bundle recording is marked with a red dot.fatcat:mxy6oby5fvgjjcdmmc6s3cbnnm