His-bundle recording
An intracardiac electrogram that records electrical activity from the His bundle, enabling precise analysis of AV conduction.
Full Definition
A His-bundle recording is an intracardiac electrogram obtained from a catheter positioned across the tricuspid valve to record electrical activity from the His bundle. The recording typically shows three distinct deflections: the atrial electrogram (A), His bundle potential (H), and ventricular electrogram (V). This technique allows precise measurement of AV conduction intervals, including AH interval (atrial to His) representing AV nodal conduction time, and HV interval (His to ventricle) representing His-Purkinje conduction time. His-bundle recordings are essential for localizing conduction blocks, evaluating pacing indications, and understanding supraventricular tachycardia mechanisms.
Usage
Usage note: Fundamental technique in electrophysiology; requires proper catheter positioning for optimal signal.
In Context
- "The His-bundle recording revealed an AH interval of 150 ms and HV interval of 55 ms, indicating normal AV conduction." — Electrophysiology study protocol
- "His-bundle recording during ventricular pacing showed ventriculoatrial dissociation, ruling out orthodromic reentrant tachycardia." — Differential diagnosis report