entrainment mapping
Pronunciation: en-TRAYN-ment
An electrophysiological technique used during ablation procedures to identify critical sites within reentrant tachycardia circuits.
Full Definition
Entrainment mapping is a sophisticated electrophysiological technique employed during catheter ablation procedures to precisely localize critical components of reentrant tachycardia circuits. The technique involves pacing from various sites within the heart during sustained tachycardia at a cycle length slightly faster than the tachycardia rate, thereby 'entraining' or temporarily controlling the arrhythmia. Analysis of the response to entrainment, including post-pacing intervals and morphology matching, helps distinguish bystander sites from critical circuit components such as the isthmus or exit site. Concealed entrainment with perfect morphology matching indicates pacing from within the protected isthmus of the reentrant circuit, identifying optimal target sites for radiofrequency ablation.
Usage
Usage note: Highly specialized term requiring expert knowledge; explain when used in general cardiology contexts.
In Context
- "Entrainment mapping identified the critical isthmus for successful VT ablation." — Electrophysiology procedure note
- "Concealed entrainment with perfect morphology matching confirmed the ablation target site." — Technical EP report