His' bundle electrogram
An EKG-like signal derived from His' bundle via intracardiac electrodes near the tricuspid valve during heart catheterization. It is used to pinpoint the site and extent of arrhythmias and conduction defects, measuring the AH and HV intervals, which reflect AV nodal and HI-Purkinje conduction, respectively. It is also used in the differential diagnosis between supraventricular and ventricular tachycardia.
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