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Multiscale Modeling of Endothelium Derived Wall Shear Stress Regulation in Common Carotid Artery

Published online by Cambridge University Press:  16 July 2019

Saeed Siri ,
Malikeh Nabaei  and
Nasser Fatouraee
Saeed Siri
Affiliation:
M.Sc. Biomedical Engineering department AmirKabir University of TechnologyTehran, Iran
Malikeh Nabaei*
Affiliation:
Assistant Professor Biomedical Engineering department AmirKabir University of TechnologyTehran, Iran
Nasser Fatouraee
Affiliation:
Associate Professor Biomedical Engineering department AmirKabir University of Technology
*
*Corresponding author (m_nabaei@aut.ac.ir, Amirkabir University of Technology, 424 Hafez Ave, Tehran, Iran, Tel: +98 (21) 64545575, P.O. Box: 15875-4413)
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Abstract

Shear induced autoregulation is the natural ability of organs to maintain the local hemodynamic stresses in a stable condition in spite of altering perfusion rate. Endothelium cells are shear sensitive mechanoreceptors that are responsible for regulating the arterial wall architecture and mechanical properties in order to maintain homeostasis. This occurs by means of vasoactive mediators, which cause vasodilation or vasoconstriction. In this paper we presented a multiscale model of local flow regulation. First, a lumped parameter model of the whole cardiovascular system was implemented. Then a 3D numerical model of human common carotid artery was constructed considering fluid-structure interaction. The CCA inflow waveform obtained from the extended 0D model was applied to the 3D model as the boundary condition. After applying the Head-Up Tilt test, the local hemodynamics were disturbed. By considering the wall shear stress as the regulation criterion, then altering the arterial mechanical properties and the following vasodilation, shear forces exerted on the inner lining of the vessel were regulated and returned to the normal range. The resulting 0D/3D model can be considered as a plat-form for a more complete model containing local and systemic cardiovascular control mechanisms and patient-specific geometries which can be used for clinical purposes.

Keywords

Multiscale modelAutoregulationFluid-structure interactionWall shear stress
Type
Research Article
Information
Journal of Mechanics , Volume 35 , Issue 6 , December 2019 , pp. 901 - 914
Copyright
© The Society of Theoretical and Applied Mechanics 2019 

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