EP 101 2020: A Virtual Program for Incoming EP Fellows-Basic Entrainment Concepts

Video Transcription

Video Summary

The speaker discusses the principles of entrainment and how it is used to identify and understand reentrant circuits in cardiac arrhythmias. Entrainment involves pacing the heart at a faster rate than the ongoing tachycardia and observing the response of the circuit. The post-pacing interval (PPI), which is the time between the last paced beat and the first return electrogram, can provide valuable information about the location of the circuit. If the PPI is the same as the tachycardia cycle length (TCL), it suggests that the pacing has accelerated the tachycardia and the pacing site is within the circuit. If the PPI is longer than the TCL, it indicates that the pacing site is remote from the circuit. The speaker also discusses how the PPI can help differentiate between different types of circuits, such as reentrant circuits and focal tachycardias. Additionally, the speaker explains the concept of resetting, where a single stimulus can temporarily interrupt a tachycardia. Overall, entrainment and the analysis of the PPI can provide valuable insights into the nature and location of cardiac arrhythmias.

Asset Subtitle

Josh Cooper, MD

Keywords

entrainment

reentrant circuits

cardiac arrhythmias

pacing

post-pacing interval

tachycardia cycle length

differentiation

resetting