(FIT)-Module 2 Workshop 2: Entrainment and SVT Maneuvers-Stevenson Case 5 Answer

Video Transcription

Video Summary

The video explains the concept of a reentry circuit in cardiac physiology, particularly during ventricular tachycardia. When pacing in an infarct region, a premature stimulus changes the QRS morphology, and the stimulus-to-QRS interval lengthens, initiating ventricular tachycardia. This happens because this premature beat takes an alternate path via the reentry circuit isthmus. The reentry circuit allows the wavefront to reenter the scar region once it can navigate past the initial block, sustaining tachycardia. This phenomenon occurs particularly around the proximal isthmus, illustrating the scar's role in altering electrical conductivity and rhythm in the heart.

Keywords

reentry circuit

ventricular tachycardia

QRS morphology

infarct region pacing

proximal isthmus