substrate mapping
Electrophysiological mapping technique that identifies abnormal myocardial tissue serving as the anatomical basis for arrhythmias.
Full Definition
Substrate mapping is an electrophysiological mapping technique that identifies and characterizes abnormal myocardial tissue that serves as the anatomical and electrical substrate for arrhythmias. The technique involves detailed analysis of local electrogram characteristics, including amplitude, duration, and fractionation patterns, to identify scar tissue, slow conduction zones, and potential critical isthmuses. Substrate mapping is particularly valuable in ventricular tachycardia ablation and complex atrial arrhythmias where the arrhythmia cannot be easily induced or sustained.
Usage
Usage note: Often used interchangeably with voltage mapping in clinical practice. Critical for scar-related arrhythmia management.
In Context
- "Substrate mapping revealed dense scar in the inferior wall with a narrow isthmus of viable tissue." — VT ablation procedure report
- "High-density substrate mapping identified low-voltage zones consistent with prior infarction." — Electrophysiology study report