Primary outcomes
IA success rate was 25/33(75.8%) by supravalvular strategy and 16/28(57.1%) by subvalvular strategy (P=0.172) (Table 2). Supravalvular strategy trended fewer ablation applications as compared to the subvalvular strategy [1.0 (1.0, 3.5) vs. 2.0 (2.0, 4.0), P=0.060] (Table 3). The operators declared IA failure in 2 patients assigned to subvalvular strategy. One had the EVA site 18.6mm above PVVJ in the PA without IA application. The other had the EVA site 6.5mm above PVVJ with 2 unsuccessful IA applications. The EVA sites with IA success or failure showed an ipsilateral or contralateral propensity to IA strategy (Figure 4A&B).