Fig. 1.

A: A high-density activation map within the LAA. Blue tag indicated the first ablation site, at which AT was terminated. Red tags show the additional ablation sites. The lower electrogram shows the local electrogram and the upper electrogram shows the reference electrogram of the coronary sinus catheter 2–3. The number showed in the box indicated the local activation time. Window of interest was set from −100 msec to 130 msec. Auto scar setting was 0.01 mV. Scar (grey dot) point was ≦0.01 mV. B–C: Voltage map during AT. Color threshold was 0.05–0.50 mV. D: Voltage map during AT. Color threshold was 0.05–0.10mV.AT = atrial tachycardia; LAA = left atrial appendage; LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein.