Figure 1.
The 12-lead electrocardiograms on admission (A). An intra-cardiac electrocardiogram during atrial tachycardia (AT) (B–D). The EnSiteTM analysis by an AdvisorTM HD Grid catheter during AT demonstrated that the carina between the right veins (PVs) exhibited a low voltage (< 0.5 mV) (B). The concealed entrainment by the ablation catheter pacing positioned on the carina between the right PVs (C) and around both right PVs (D) were obtained. The post-pacing interval almost equaled the cycle-length of this AT (C, D). This AT steadily terminated (black arrow) within 2 seconds after commencing the radiofrequency energy delivery to the carina of the right PVs (E).