Primary endpoint
A total of 23 VT recurrences (39.6%) occurred during a mean follow-up period of 2.5 years. Patients who did not undergo PES after RF delivery due to non-inducibility before RF delivery, showed significantly higher VT-free survival rate during the follow-up period than those who did not undergo PES because of other causes (Log-rank < 0.001) (Figure 1 ). The prevalence of VT recurrence-free patients at 2 years after VT ablation was significantly higher in patients with non-inducibility before RF delivery than those with other causes (92% vs. 36%; P < 0.001).
Additionally, we evaluated VT recurrence rate after VT ablation among the total procedures divided into four groups: 1) where a target VT was not inducible at the end of the procedure, 2) where a target VT was still inducible at the end of the procedure, 3) where PES was not implemented because of non-inducibility before RF delivery, 4) where PES was not implemented because of other causes (Supplementary Figure 1 ). Additional ad-hoc analysis of each pair of groups were also noted in the figure.