Geometric characteristics of bicuspid aortic valves

Jan Nijs, Babs Vangelder, Kaoru Tanaka, Sandro Gelsomino, Ines Van Loo, Mark La Meir, Jos Maessen, Bas L J H Kietselaer

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Objective: We studied the coaptation angles α and β in bicuspid aortic valve geometry from computed tomography scan images.

Methods: In 45 patients, we calculated the coaptation angle α (the angle between the nonfused commissures crossing the center of coaptation), angle β (between the nonfused commissures crossing the center of the reference circle), angles γ1 and γ2 and ε1 and ε2 (angle between the nonfused commissures and the coaptation point at the raphe or the perfect midpoint, respectively), the length of the raphe, the absolute and relative sinuses' surfaces (relative to the perfect circle and the percentage exceeding the ideal circle). Spearman correlation was employed to investigate the associations among all parameters.

Results: The coaptation angles α and β were significantly different (P < .001). We found a significant correlation of α with the length of the raphe (P = .008), whereas β was dependent on the position of the commissures. Both γ1 and γ2 (P = .04), or ε1 and ε2 (P < .001) significantly differed from each other and ε2 was the most constant angle, although its size geometrically depends on β. The noncoronary was the largest sinus, and β was the primary determinant of its increased size in bicuspid aortic valves with righ/left fusion pattern.

Conclusions: The coaptation angle α is influenced by the length of the raphe, whereas angle β is dependent on the position of the commissures. The position of the raphe can vary and is not always situated in the middle of the free edge. The position of the right/non commissure is variable, whereas the right/left commissure is more fixed.

Original languageEnglish
Pages (from-to)200-215
Number of pages16
JournalJTCVS techniques
Volume10
DOIs
Publication statusPublished - Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 The Author(s)

Copyright:
Copyright 2022 Elsevier B.V., All rights reserved.

Keywords

  • BAV
  • bicuspid aortic valve
  • CT
  • computed tomography
  • NCS
  • noncoronary sinus
  • aorta
  • aortic valve
  • aortic valve repair
  • bicuspid

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