4 DISCUSSION
The major finding of this study was that in cases wherein CB ablation of
the superior PVs was unable to isolate the PVs, the CST ablation
technique was highly successful if CB ablation of the superior PVs met
the following two criteria: NT ≤-46°C and complete occlusion of the
superior PVs. Furthermore, the CST ablation technique was mostly
ineffective in cases wherein these two criteria were not met.