Figure legends
Figure 1 Flow chart of the study design. CB, cryoballoon; PV, pulmonary vein.
Figure 2 Occlusion assessment results of different pulmonary veins using the baseline tool (A), injection tool (B), and pulmonary venography (C) as verification standards. LSPV, left superior pulmonary vein; LIPV, left inferior pulmonary vein; RSPV, right superior pulmonary vein; RIPV, right inferior pulmonary vein.
Figure 3 Receiver operating characteristic curves showing occlusion assessment value of the baseline (A) and injection tool (B).
Figure 4 Nadir temperature (A) and total thaw time (B) in pulmonary veins with and without optimal occlusion using the baseline and injection tool. Optimal occlusion refers to 3 points in the baseline tool or 1 point in the injection tool; nonoptimal occlusion refers to< 2 points in the baseline tool or 0 point in the injection tool.