(FIT)-Module 4 Workshop 6: Electrocardiographic and Electrophysiological Correlations-Gerstenfeld Case 3 Answer

Video Transcription

Video Summary

The transcript explains the diagnostic process for identifying an "outer loop" site in ventricular tachycardia (VT) mapping. When overdrive pacing, acceleration of the VT to the pace rate indicates you're in the circuit. A similar stimulus to QRS and electrogram to QRS confirms this, as does a post-pacing interval close to the tachycardia cycle length. However, fusion observed on the ECG, where the vector direction remains but QRS morphology changes, reveals it's an outer loop site. The text references a Stevenson paper, emphasizing the importance of understanding entrainment and mapping techniques for VT.

Keywords

ventricular tachycardia

outer loop site

overdrive pacing

entrainment mapping

Stevenson paper