Fig. 3.

Body surface and intracardiac electrocardiograms (A) just before commencing the radiofrequency application inside the transseptal puncture hole during the BiAT and (B) when the BiAT terminated. Continuous fractionated electrograms were recorded by the ablation catheter placed at the transseptal puncture site during the BiAT. (C) The intracardiac echocardiographic image and (D) right and left anterior oblique fluoroscopic images showing the position of the ablation catheter during the radiofrequency application that terminated the BiAT.

Abbreviations: ABL, the tip of the ablation catheter; ABL 1–2 and 3–4, distal and proximal ablation catheter recordings. The other abbreviations are as in Fig. 1, Fig. 2.