Laser Doppler velocimetry and flow visualization studies in the regurgitant leakage flow region of three mechanical
R S Meyer1, S Deutsch, C B Bachmann
1Applied Research Laboratory, Department of Bioengineering, Pennsylvania State University, University Park, Pennsylvania 16802-4400, U.S.A.
Abstract:
Streak line flow visualization and laser Doppler velocimetry (LDV) were conducted in the regurgitant leakage flow region of 3 mechanical heart valve types: CarboMedics, Medtronic Hall, and St. Jude Medical. Streak line flow visualization identified regions of high regurgitant flow, and LDV measurements were focused on those locations. Maximum regurgitant flow velocities after valve closure ranged from 0.7 to 2.6 m/s, and maximum Reynolds shear stress after valve closure ranged from 450 to 3,600 dyne/cm2. These data indicate that leakage flows can generate turbulent jets with elevated Reynolds stresses even in bileaflet valves.
Related Concept Videos
Mitral Regurgitation I: Introduction
Mitral Regurgitation II: Clinical Features and Diagnostic Tests
Mitral Regurgitation III: Medical Management
Mitral Stenosis III: Medical Management
Aortic Regurgitation I: Introduction
Aortic Regurgitation II: Clinical Features and Diagnostic Tests


