(FIT)-Module 1, Workshop 1: Electrocardiographic/Electrophysiologic Correlation-Miller Case 2 Answer

Video Transcription

Video Summary

The answer involves a bidirectional right bundle branch block and a retrograde AV nodal block. The tracing shows a right bundle branch block with a prolonged HV interval and a retrograde HISS during right ventricular pacing, indicating delayed conduction down the right ventricle. The HISS-Purkinje system compensates by conducting the signal retrograde through the left bundle. This results in anterograde and retrograde conduction, forming a bidirectional right bundle branch block. Additionally, the retrograde conduction does not reach the atrium due to a block in the AV node, indicating retrograde AV nodal block.

Keywords

bidirectional right bundle branch block

retrograde AV nodal block

prolonged HV interval

retrograde His-Purkinje conduction

right ventricular pacing