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The mother's (A) and her son's electrogram (B) during typical atrioventricular nodal reentrant tachycardia. Following cessation of ventricular entrainment pacing the tachycardia resumes with a V-A-V response and the values of the post-pacing interval minus the tachycardia cycle length were greater than 115 msec in both patients. HISd: HIS distal, HISm: HIS middle, HISd: HIS distal, HA: HIS-atrial interval.
