title: Determination of mitral valve area in patients with mitral stenosis by the flow-convergence-region method during changing hemodynamic conditions.
abstract: Twenty-eight patients with mitral stenosis underwent Doppler echocardiography at rest and during exercise to determine the accuracy of mitral valve area determination by the flow-convergence-region method during exercise-induced changing hemodynamic conditions. The mitral valve area calculated by using the flow-convergence-region method correlated strongly with that measured by the Gorlin formula both at rest (r = 0.85) and during exercise (r = 0.92) for all 28 patients studied. Although mitral valve area obtained by the flow-convergence-region method did not change (p = 0.1) in 16 patients with echocardiographic mitral scores > or = 12, it increased significantly during exercise (p = 0.0001) in 12 patients with echocardiographic mitral scores < 12. This study suggests that in mitral stenosis, the mitral valve area can be accurately estimated by the flow-convergence-region method both at rest and during changing hemodynamic conditions induced by supine bicycle exercise.
authors.affiliation: Department of Geriatric Medicine, Kanazawa Medical University, Ishikawa-ken, Japan.
authors.forename: Y B
authors.initials: YB
authors.lastname: Deng
authors.forename: M
authors.initials: M
authors.lastname: Matsumoto
authors.forename: J
authors.initials: J
authors.lastname: Munehira
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity; D001794:Blood Pressure; D006328:Cardiac Catheterization; D002302:Cardiac Output; D018618:Echocardiography, Doppler, Color; D005080:Exercise Test; D006339:Heart Rate; D006439:Hemodynamics; D018056:Hemorheology; D006801:Humans; D008875:Middle Aged; D008943:Mitral Valve / Q000000981:diagnostic imaging / Q000473:pathology* / Q000503:physiopathology; D008946:Mitral Valve Stenosis / Q000000981:diagnostic imaging / Q000473:pathology* / Q000503:physiopathology; D005082:Physical Exertion; D011673:Pulsatile Flow; D012146:Rest; D016683:Supine Position; D016277:Ventricular Function, Left; D017725:Ventricular Pressure