Study design
Ablation was performed at a total of 549 points in 36 patients. The sites where dormant conduction was induced or additional ablation was needed due to residual SVC potentials after the circumferential ablation, were defined as touch-up sites (n=36). The SVC was divided into four segments (Figure 1) and the location of the touch up sites was analyzed. The value of the AI was also retrospectively calculated at every ablation site. We compared the energy deliver time, power, CF, FTI, and AI between the touch up sites and control sites (n=513). The local potentials at the ablation site were obtained from the ablation catheter and compared among the 4 SVC segments.