Baseline characteristics and AF recurrence after RFCA
The mean age was 62.5 ± 10.3 years, 119 (84.4%) were male, and the body mass index (BMI) was 24.6 ± 3.3 kg/m2. The mean CHADS2 and CHA2DS2-VASc scores were 1.3 ± 1.1 and 2.1 ± 1.5, respectively. The mean left atrial diameter (LAD) was 43.2 ± 6.3 mm, and the left ventricular ejection fraction (LVEF) was 64.6 ± 10.5%. Those baseline characteristics are listed in Table 1 .
The mean follow-up period after the procedure was 24.3 ± 12.2 months. One hundred seven patients (75.9%) were in SR and 34 (24.1%) developed an AF recurrence. As shown in Table 1 , the AF recurrence group had a longer duration of AF, higher use rate of AADs after the RFCA, and higher IDF threshold after the RFCA as compared to that in the no-recurrence group (p < 0.05). However, there were no significant differences in the age, sex distribution, BMI, CHADS2 score, Creatinine, brain natriuretic peptide (BNP), LAD, LVEF, non-PV foci, and IDF threshold before the RFCA between the two groups.