Amplitude Mapping
Electroanatomical mapping technique that displays electrogram voltage amplitudes as color-coded overlays on cardiac geometry.
Full Definition
Amplitude mapping is an electroanatomical mapping technique that displays local electrogram voltage amplitudes as color-coded overlays on three-dimensional cardiac geometry. Areas with low voltage (typically <0.5 mV for ventricular tissue and <0.2 mV for atrial tissue) are displayed in red and represent scar or fibrotic tissue, while areas with normal voltage appear purple or blue. This mapping technique is essential for identifying arrhythmia substrates, planning ablation strategies, and avoiding healthy myocardium. Amplitude maps are often combined with activation timing and pace mapping to create comprehensive substrate maps.
Usage
Usage note: Color coding varies by system manufacturer. Red typically indicates low voltage/scar tissue.
In Context
- "Amplitude mapping revealed extensive low-voltage zones in the anterior wall consistent with prior infarction." — Mapping report
- "The amplitude map guided identification of critical isthmuses within the scar-related VT circuit." — Ablation strategy