Recurrence of AA by anatomic characteristics of PVs:
The anatomic indices for each of the PVs based on the presence or absence of recurrence of AA showed no significant difference between the two groups (Table 3 ). On comparing the anatomic indices for the left versus right-sided PVs (Table 4 ), the left inferior PV (LIPV) was more oval compared to the right inferior PV (RIPV), and there was a strong trend for the left superior PV (LSPV) being more oval compared to the right superior PV (RSPV). However, the ostial PVA was greater for the right-sided PVs. Furthermore, on univariate analysis, only the PVA of the LIPV was a significant predictor for recurrence of AA. This association was no longer significant once the LIPV ostial area was adjusted further in a multivariate model (Table 5 ).