NDLI: Time-Resolved DPIV Analysis of Vortex Dynamics in a Left Ventricular Model Through Bileaflet Mechanical and Porcine Heart Valve Prostheses

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Pierrakos, Olga Vlachos, Pavlos P. Telionis, Demetri P.
Copyright Year	2004
Abstract	The performance of the heart after a mitral valve replacement operation greatly depends on the flow character downstream of the valve. The design and implanting orientation of valves may considerably affect the flow development. A study of the hemodynamics of two orientations, anatomical and anti-anatomical, of the St. Jude Medical (SJM) bileaflet valve are presented and compared with those of the SJM Biocor porcine valve, which served also to represent the natural valve. We document the velocity field in a flexible, transparent (LV) using time-resolved digital particle image velocimetry (TRDPIV). Vortex formation and vortex interaction are two important physical phenomena that dominate the filling and emptying of the ventricle. For the three configurations, the following effects were examined: mitral valve inlet jet asymmetry, survival of vortical structures upstream of the aortic valve, vortex-induced velocities and redirection of the flow in abidance of the Biot–Savart law, domain segmentation, resonant times of vortical structures, and regions of stagnant flow. The presence of three distinct flow patterns, for the three configurations, was identified by the location of vortical structures and level of coherence corresponding to a significant variation in the turbulence level distribution inside the LV. The adverse effect of these observations could potentially compromise the efficiency of the LV and result in flow patterns that deviate from those in the natural heart.
Starting Page	714
Ending Page	726
Page Count	13
File Format	PDF
ISSN	01480731
e-ISSN	15288951
Journal	Journal of Biomechanical Engineering
Volume Number	126
Issue Number	6
DOI	10.1115/1.1824124
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2005-02-04
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biot-Savart law Cycles Design Dynamics (Mechanics) Flow (Dynamics) Heart valve prostheses Hemodynamics Valves Vortices Vorticity
Content Type	Text
Resource Type	Article
Subject	Physiology (medical) Biomedical Engineering

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