(FIT)-Module 2 Workshop 3: SVT Mechanisms and Maneuvers-Stevenson Case 2 Answer

Video Transcription

Video Summary

The correct answer is E, cannot be determined. During ventricular pacing in supraventricular tachycardia, all electrograms and QRS complexes accelerate to the pacing rate, excluding atrial tachycardia. The focus is on whether the tachycardia is due to AV nodal reentry or an accessory pathway. A long post-pacing interval suggests AV nodal reentry but doesn't rule out an accessory pathway, especially if it's non-septal. In this case, early activation at the distal coronary sinus indicates a left-sided accessory pathway. The reentry circuit uses the left bundle, explaining the long post-pacing interval, despite it being orthodromic AV reentry tachycardia.

Keywords

ventricular pacing

supraventricular tachycardia

AV nodal reentry

accessory pathway

orthodromic AV reentry tachycardia