Secondary outcomes
The 20 patients with IA failure all had successful ablation by the other strategy. 1 patient assigned to supravalvular strategy suffered from tamponade after the procedure, but recovered by urgent drainage without blood transfusion. No complications occurred in the other patients. Follow-up continued for a median of 12(10, 12) months until February 2021. In total, 43/61(70.5%) patients reached the 12 months of follow-up (Figure 5). 1 patient from supravalvular strategy and 3 from subvalvular strategy had VA recurrence (P=0.243). The patient from supravalvular strategy had a second procedure after 1 month. Activation mapping revealed the same EVA site in LC, and ablation using the reversed U-curve eliminated PVC within seconds. The patient was then followed for 9 months. No VA recurrence was noted.