title: Influence of Tricuspid Bioprosthetic Mitral Valve Orientation Regarding the Flow Field Inside the Left Ventricle: In Vitro Hydrodynamic Characterization Based on 2D PIV Measurements.
abstract: The flow patterns of a prosthetic heart valve in the aortic or mitral position can change according to its type and orientation. This work describes the use of 2D particle image velocimetry (PIV) applied to the in vitro flow fields characterization inside the upper part of a left ventricular model at various heart rates and as a function of two orientations of stented tricuspid mitral bioprostheses. In the ventricular model, each mitral bioprosthesis (27 and 31 mm diameter) was installed in two orientations, rotated by 180°, while the aortic bileaflet mechanical valve (27 mm diameter) remained in a fixed orientation. The results (N = 50) showed changes in the intraventricular flow fields according to the mitral bioprostheses positioning. Also, changes in the aortic upstream velocity profiles were noticed as a function of mitral orientations.
authors.affiliation: Department of Mechanical Engineering, Polytechnic School of the University of São Paulo, São Paulo, Brazil.
authors.forename: Ovandir
authors.identifier: http://orcid.org/0000-0003-1803-0526
authors.initials: O
authors.lastname: Bazan
authors.affiliation: Department of Mechanical Engineering, Polytechnic School of the University of São Paulo, São Paulo, Brazil.
authors.forename: Jayme P
authors.initials: JP
authors.lastname: Ortiz
authors.affiliation: Department of Mechanical Engineering, Polytechnic School of the University of São Paulo, São Paulo, Brazil.
authors.forename: Newton K
authors.initials: NK
authors.lastname: Fukumasu
authors.affiliation: Department of Mechanical Engineering, Polytechnic School of the University of São Paulo, São Paulo, Brazil.
authors.forename: Antonio L
authors.initials: AL
authors.lastname: Pacifico
authors.affiliation: Department of Mechanical Engineering, Polytechnic School of the University of São Paulo, São Paulo, Brazil.
authors.forename: Jurandir I
authors.initials: JI
authors.lastname: Yanagihara
mesh_terms: D001705:Bioprosthesis; D003198:Computer Simulation; D006339:Heart Rate; D006350:Heart Valve Prosthesis; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D057446:Hydrodynamics; D008943:Mitral Valve / Q000503:physiopathology*; D008955:Models, Cardiovascular; D009200:Myocardial Contraction; D011474:Prosthesis Design; D012212:Rheology; D014261:Tricuspid Valve / Q000503:physiopathology*
keywords: Hydrodynamic characterization; Left ventricular model; Mitral bioprosthesis; Two-dimensional particle image velocimetry measurements; Valve orientation