A Model for Aortic Growth Based on Fluid Shear and Fiber Stresses

[+] Author and Article Information
L. A. Taber

Department of Biomedical Engineering, Washington University, St. Louis, MO 63130

J Biomech Eng 120(3), 348-354 (Jun 01, 1998) (7 pages) doi:10.1115/1.2798001 History: Received August 22, 1996; Revised July 30, 1997; Online October 30, 2007


Stress-modulated growth in the aorta is studied using a theoretical model. The model is a thick-walled tube composed of two pseudoelastic, orthotropic layers representing the intima/media and the adventitia. Both layers are assumed to follow a growth law in which the time rates of change of the growth stretch ratios depend linearly on the local smooth muscle fiber stress and on the shear stress due to blood flow on the endothelium. Using finite elasticity theory modified to include volumetric growth, we computed temporal changes in stress, geometry, and opening angle (residual strain) during development and following the onset of sudden hypertension. For appropriate values of the coefficients in the growth law, the model yields results in reasonable agreement with published data for global and local growth of the rat aorta.

Copyright © 1998 by The American Society of Mechanical Engineers
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