Cryoablation parameters
A total of 122 cryoablations in all the PVs were applied, in which TTI was recorded in 60 (49.2%) PVs (LSPV, 25/31; LIPV, 13/28; RSPV, 13/35; RIPV, 9/28). According to the baseline tool, the mean nadir temperature was -44.3 + 8.4 ℃ and -35.1 + 6.5 ℃ in PVs with and without optimal occlusion (P < 0.001), while the total thaw time was 53.3 + 17.0 s and 38.2 + 14.9 s in both groups (P = 0.003). When using the injection tool, the mean nadir temperature was -46.7 + 6.4 ℃ and -38.3 + 9.2 ℃ in PVs with and without optimal occlusion (P < 0.001), while the total thaw time was 58.5 + 15.5 s and 41.7 + 15.2 s in both groups (P < 0.001) (Figure 4). Table 3 shows the correlation between PV occlusion and cryoablation parameters.