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Patient 3. Intracardiac electrograms of fast–slow AVNRT with a bystander cNVP connected to the slow pathway (SP). Right ventricular overdrive pacing delays the atrial electrograms during the transition zone. Moreover, the pacing retrogradely captures the His electrogram but fails to accelerate the atrium to the pacing cycle length in two beats, indicating the dissociated His from the tachycardia. Abbreviations as in Figure 2.
