BackgroundThe influence of pulmonary vein (PV) anatomy on cryo kinetics during
cryoballoon (CB) ablation is unclear.ObjectiveTo investigate the relationship between PV anatomy and cryo kinetics during
CB ablation for atrial fibrillation (AF).MethodsSixty consecutive patients were enrolled. PV anatomy, including ostial
diameters (long, short and corrected), ratio between short and long
diameters, ostium shape (round, oval, triangular, and narrow), and drainage
pattern (typical, with common trunk, common antrum, ostial branch and
supernumerary PV) were evaluated on multi-detector computed tomography
(MDCT) images pre-procedure. Cryo kinetics parameters [balloon freeze
time from 0 to -30ºC (BFT), balloon nadir temperature (BNT) and
balloon warming time from -30 to +15ºC (BWT)] were recorded
during procedure. All p values are two-sided, with values of p < 0.05
considered to be statistically significant.Results606 times of freezing cycle were accomplished. Moderate negative correlation
was documented between BNT and corrected PV diameter (r = -0.51, p <
0.001) when using 23-mm CBs, and mild negative correlation (r = - 0.32, p =
0.001) was found when using 28-mm CBs. Multivariate logistic regression
analysis revealed that PV corrected ostial diameter (OR, 1.4; p = 0.004)
predicted a BNT < -51ºC when using 23-mm CBs, while PV ostium oval
shape (OR, 0.3; p = 0.033) and PV locations (left inferior PV: OR, 0.04; p =
0.005; right superior PV: OR, 4.3; p = 0.025) predicted BNT <
-51ºC when using 28-mm CBs.ConclusionsMDCT can provide PV anatomy accurate evaluation prior CB ablation. PV anatomy
is associated with cryo kinetics during ablation.