activation mapping
An electrophysiologic technique that determines the temporal sequence of electrical activation across cardiac tissue during arrhythmias.
Full Definition
Activation mapping is a fundamental electrophysiologic technique used to determine the sequence and timing of electrical activation across cardiac tissue during normal rhythm or arrhythmias. By recording local electrograms from multiple sites and analyzing their timing relative to a reference signal, electrophysiologists can identify the earliest site of activation, propagation patterns, and potential ablation targets. This technique is essential for localizing arrhythmia origins and understanding conduction pathways in both atrial and ventricular arrhythmias.
Usage
Usage note: Distinguish from pace mapping, which involves pacing from different sites to match morphology.
In Context
- "Activation mapping revealed earliest ventricular activation at the left ventricular outflow tract during the clinical tachycardia." — Electrophysiology study report
- "High-density activation mapping was performed using a multipolar catheter to localize the focal atrial tachycardia." — Procedural note