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Electrophysiology Unit (EPU) Practice Exam

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In electrophysiology, which interval represents conduction time between the atrium and the His bundle?
Correct Answer:
AH interval
Explanation:
Conduction time from the atrial signal to the His bundle is the AV nodal conduction time, known as the AH interval. It specifically measures how long the impulse takes to travel from the atrial tissue down to the His bundle before moving into the ventricles, and it’s assessed in EP studies by timing from the atrial signal to the His bundle potential. The PR interval on a surface ECG includes atrial conduction, AV nodal delay, and His-Purkinje conduction up to the start of ventricular depolarization, so it’s not as specific to the atrium-to-His path. The QRS duration reflects ventricular depolarization time, and the QT interval covers ventricular depolarization and repolarization. Thus, the AH interval best fits conduction time between the atrium and the His bundle.

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