Touch-up ablation
In the CBA group, the rate of touch-up ablation was 20%, which was very high in our participant cohort. Based on our data, it is difficult to evaluate the relationship between the rate of touch-up ablation and HD. From a post-marketing surveillance report in Japan, 15.9% of patients needed treatment with focal ablation in addition to CBA.15 From the North America registry study, 7.3% of patients needed treatment with focal ablation in addition to CBA.16 Thus, there is a gap in the touch-up ablation rate in each report. One possible reason is the difference in institutional and operator volume. In our study, four out of five patients who needed a touch-up ablation underwent CA within one year since we started CBA in our institution. The learning curve of CBA in our hospital should be considered for this touch-up rate. Therefore, the high touch-up rate might be related with the institutional volume, not with HD.