HRS Board Review 2025 New Courses (Reviewers Copy)-Workshop 1_Electrocardio_Miller_2025

Workshop 1_Electrocardio_Miller_2025_case 3 answer

Video Transcription

Video Summary

The video discusses a case where retrograde conduction is absent and the block occurs in the His-Purkinje system. It observes six ventricular pacing complexes with captured sinus complexes. Despite ventricular pacing, there's an independent atrial rhythm and constant AH intervals with no retrograde influence. Normally, retrograde activation occurs in the His-Purkinje system but is blocked at the AV node. In this case, the lack of change in AH intervals suggests the blockage occurs at the His-Purkinje system, not the AV node, indicating a rare situation where the His-Purkinje system is impaired despite normal AH intervals.

Keywords

retrograde conduction

His-Purkinje system

ventricular pacing

atrial rhythm

AH intervals