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A paired t-test (for normally distributed data) or Wilcoxon signed-rank test (for nonparametric data) was used to compare HRV parameters before and after ablation in the SPVI or CPVI groups.
One hundred seventy-five patients were successfully followed up (Group SPVI = 64; Group CPVI = 111).
Total ablation time was 45.4 [+ or -] 14.4 minutes for SPVI approach and 69.6 [+ or -] 25.2 minutes for the CPVI approach (P < 0.001), whereas success and recurrence subgroups of either technique did not differ significantly in terms of ablation time (SPVI-S 47.5 [+ or -] 14.6 minutes versus SPVI-R 40.2 [+ or -] 12.9 minutes; CPVI-S 70.1 [+ or -] 25.4 minutes versus CPVIR 68.5 [+ or -] 25.2 minutes; P > 0.05).
The HRV parameters SDNN, SDANN, rMSSD, PNN50, LF, HF, and LF/HF decreased significantly after SPVI or CPVI (Figures 1 and 2).
(1) All studied HRV parameters decreased significantly after SPVI or CPVI procedures, whether they were recurrent or not.
In clinical practice, SPVI targets preferential electrical connections between PVs and LA, whereas CPVI targets the PV antrum with linear ablation encircling the ipsilateral PVs 0.5-1.0 cm outside of the PV ostia.
 compared PAF recurrences after either SPVI or CPVI at 1 year of followup.
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