The Measurement of Opening Angle and Orifice Area of a Bileaflet Mechanical Valve Using Multidetector Computed Tomography

Overview

Journal Korean Circ J

Date 2009 Dec 2

PMID 19949605

Citations 4

Authors

Dong-Hyeon Lee

Ho-Joong Youn

Sung-Bo Shim

Sun-Hee Lee

Jung-Im Jung

Seung-Eun Jung

Yun-Seok Choi

Chul-Soo Park

Yong-Seog Oh

Wook-Sung Chung

Jae-Hyung Kim

Affiliations

Soon will be listed here.

Abstract

Background And Objectives: The aim of this study was to assess mechanical valve function using 64-slice multidetector computed tomography (MDCT).

Subjects And 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.

Conclusion: MDCT is an accurate modality with which to assess the function and morphology of bileaflet mechanical valves.

Citing Articles

Extent of Subprosthetic Pannus after Aortic Valve Replacement: Changes Over Time and Relationship with Echocardiographic Findings.

Park M, Koo H, Ha H, Kang J, Yang D Taehan Yongsang Uihakhoe Chi. 2022; 81(5):1151-1163.

PMID: 36238048 PMC: 9431869. DOI: 10.3348/jksr.2019.0124.

Impact of pannus formation on hemodynamic dysfunction of prosthetic aortic valve: pannus extent and its relationship to prosthetic valve motion and degree of stenosis.

Koo H, Ha H, Kang J, Kim J, Song J, Kim H Clin Res Cardiol. 2018; 107(7):554-564.

PMID: 29460005 DOI: 10.1007/s00392-018-1217-3.

Measurement of Opening and Closing Angles of Aortic Valve Prostheses In Vivo Using Dual-Source Computed Tomography: Comparison with Those of Manufacturers' in 10 Different Types.

Suh Y, Kim Y, Hong Y, Lee H, Hur J, Im D Korean J Radiol. 2015; 16(5):1012-23.

PMID: 26356549 PMC: 4559772. DOI: 10.3348/kjr.2015.16.5.1012.

Evaluation of the aortic and mitral valves with cardiac computed tomography and cardiac magnetic resonance imaging.

Ko S, Song M, Hwang H Int J Cardiovasc Imaging. 2012; 28 Suppl 2:109-27.

PMID: 23139149 DOI: 10.1007/s10554-012-0144-z.

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