intracardiac electrogram
Electrical recordings obtained from electrodes placed directly within the heart chambers during electrophysiology procedures.
Full Definition
Intracardiac electrograms are high-fidelity electrical recordings obtained from electrodes positioned directly within the heart chambers or on the cardiac surface during invasive electrophysiology studies and ablation procedures. These recordings provide detailed information about local electrical activation, conduction patterns, and timing relationships that cannot be obtained from surface ECGs. Intracardiac electrograms are essential for mapping arrhythmia circuits, identifying critical isthmus sites for ablation, and confirming procedural success. The signals typically show sharp, high-amplitude deflections corresponding to local myocardial activation and can be filtered and amplified to enhance specific frequency components relevant to the procedure.
Usage
Usage note: Often abbreviated as IEGM in EP contexts; specify location and timing when relevant.
In Context
- "Intracardiac electrograms demonstrated earliest activation at the posterior left atrium." — EP study report
- "High-density mapping catheters provide detailed intracardiac electrogram information." — Procedure description