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Two-Dimensional Dynamic Simulation of Platelet Activation During Mechanical Heart Valve Closure

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Abstract

A major drawback in the operation of mechanical heart valve prostheses is thrombus formation in the near valve region. Detailed flow analysis in this region during the valve closure phase is of interest in understanding the relationship between shear stress and platelet activation. A fixed-grid Cartesian mesh flow solver is used to simulate the blood flow through a bi-leaflet mechanical valve employing a two-dimensional geometry of the leaflet with a pivot point representing the hinge region. A local mesh refinement algorithm allows efficient and fast flow computations with mesh adaptation based on the gradients of the flow field in the leaflet-housing gap at the instant of valve closure. Leaflet motion is calculated dynamically based on the fluid forces acting on it employing a fluid-structure interaction algorithm. Platelets are modeled and tracked as point particles by a Lagrangian particle tracking method which incorporates the hemodynamic forces on the particles. A platelet activation model is included to predict regions which are prone to platelet activation. Closure time of the leaflet is validated against experimental studies. Results show that the orientation of the jet flow through the gap between the housing and the leaflet causes the boundary layer from the valve housing to be drawn in by the shear layer separating from the leaflet. The interaction between the separating shear layers is seen to cause a region of intensely rotating flow with high shear stress and high residence time of particles leading to high likelihood of platelet activation in that region.

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Acknowledgments

Partial support of this work from a grant from the NIH (NHLBIHL-071814) and the Iowa Department of Economic Development are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, College of Engineering, University of Iowa, Iowa City, IA, 52242, USA

    S. Krishnan, H. S. Udaykumar & J. S. Marshall

  2. Department of Biomedical Engineering, 1402 SC, College of Engineering, University of Iowa, Iowa City, IA, 52242, USA

    K. B. Chandran

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  1. S. Krishnan
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Correspondence to K. B. Chandran.

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Krishnan, S., Udaykumar, H., Marshall, J. et al. Two-Dimensional Dynamic Simulation of Platelet Activation During Mechanical Heart Valve Closure. Ann Biomed Eng 34, 1519–1534 (2006). https://doi.org/10.1007/s10439-006-9194-5

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