title: Pulmonary vein morphology before and after segmental isolation in patients with atrial fibrillation.
abstract: BACKGROUND
  The morphology of the pulmonary veins (PVs) before and after segmental isolation of the PVs has not been sufficiently characterized.
  
  
  RESULTS
  Multi-slice computed tomography was performed before and 3 +/- 1 months after ablation in 30 patients with atrial fibrillation who underwent PV isolation. Before ablation, PV narrowing (> or =25% luminal reduction) was found in nine (8%) PVs. After ablation, de novo PV narrowing was found in 24 PVs (26%) and was detected only in the supero-inferior direction in 14 PVs (58%). The diameter reduction inside the PVs after ablation was greater in the supero-inferior direction (14 +/- 12%) than in the antero-posterior direction (9 +/- 13%; P < 0.0001). In the ablated PVs, the PV trunk was shorter than before ablation (P < 0.0001). The reduction in the diameters of both the PV ostium and the ablation site in the ablated PVs, as well as the diameter of the PV ostium in the nonablated PVs, correlated with the decrease in the left atrial diameter. Shortening of the PV trunk correlated with the severity of PV narrowing, but it was not related to the percent diameter reduction of the left atrium. PV narrowing before or after ablation did not result in any clinical consequences.
  
  
  CONCLUSIONS
  PV narrowing is present in about 10% of PVs before ablation. Asymmetric luminal reduction and longitudinal shrinkage of the PV trunk occur after ablation. Reverse remodeling of the PV and contraction of the PV wall may contribute to the reduction in the PV diameter. PV morphology should be assessed with multi-directional views to avoid missing heterogeneous legions.
authors.affiliation: Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan.
authors.forename: Marehiko
authors.initials: M
authors.lastname: Ueda
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tada
authors.forename: Kenji
authors.initials: K
authors.lastname: Kurosaki
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Itoi
authors.forename: Keiko
authors.initials: K
authors.lastname: Koyama
authors.forename: Shigeto
authors.initials: S
authors.lastname: Naito
authors.forename: Sachiko
authors.initials: S
authors.lastname: Ito
authors.forename: Issei
authors.initials: I
authors.lastname: Komuro
authors.forename: Shigeru
authors.initials: S
authors.lastname: Oshima
authors.forename: Koichi
authors.initials: K
authors.lastname: Taniguchi
mesh_terms: D000704:Analysis of Variance; D001281:Atrial Fibrillation / Q000000981:diagnostic imaging / Q000601:surgery*; D017115:Catheter Ablation; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011667:Pulmonary Veins / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery*; D014057:Tomography, X-Ray Computed