title: The measurement of opening angle and orifice area of a bileaflet mechanical valve using multidetector computed tomography.
abstract: OBJECTIVE
  The aim of this study was to assess mechanical valve function using 64-slice multidetector computed tomography (MDCT).
  
  
  METHODS
  In 20 patients (mean age, 50+/-12 years; male-to-female ratio, 10:10), 30 St. Jude bileaflet mechanical valves (15 aortic and 15 mitral valves) were evaluated using MDCT. We selected images vertical and parallel to the mechanical valve. The valve orifice area (OA) and valve length were determined by manual tracing and the opening and closing angles were measured using a protractor. The OA and length of the mechanical valves were compared with the manufacturer's values.
  
  
  RESULTS
  The geometric orifice areas (GOAs) based on the manufacturer's values and the OAs determined by MDCT were 3.4+/-0.2 cm(2) and 3.4+/-0.3 cm(2) for the mitral valves and 2.1+/-0.3 cm(2) and 2.1+/-0.4 cm(2) for the aortic valves, respectively. The correlation coefficients between the OA measures were 0.433 for the mitral valves and 0.874 for the aortic valves (both p<0.001). The lengths based on the manufacturer's values and determined by MDCT were 29.3+/-1.99 mm and 29.6+/-1.65 mm for the mitral valves and 21.5+/-2.1 mm and 20.7+/-2.3 mm for the aortic valves, respectively. The correlation coefficients between the measures were 0.651 for the mitral valve and 0.846 for the aortic valve (both p<0.001). The opening and closing angles determined by MDCT were 10.9+/-0.6 degrees and 131.1+/-3.2 degrees for the mitral valves and 11.1+/-0.9 degrees and 120.6+/-1.7 degrees for the aortic valves, respectively.
  
  
  CONCLUSIONS
  MDCT is an accurate modality with which to assess the function and morphology of bileaflet mechanical valves.
authors: Division of Cardiology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors: Dong-Hyeon
authors: DH
authors: Lee
authors: Ho-Joong
authors: HJ
authors: Youn
authors: Sung-Bo
authors: SB
authors: Shim
authors: Sun-Hee
authors: SH
authors: Lee
authors: Jung-Im
authors: JI
authors: Jung
authors: Seung-Eun
authors: SE
authors: Jung
authors: Yun-Seok
authors: YS
authors: Choi
authors: Chul-Soo
authors: CS
authors: Park
authors: Yong-Seog
authors: YS
authors: Oh
authors: Wook-Sung
authors: WS
authors: Chung
authors: Jae-Hyung
authors: JH
authors: Kim