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Biomechanics and Modeling in Mechanobiology

, Volume 2, Issue 2, pp 109–126 | Cite as

A constrained mixture model for arterial adaptations to a sustained step change in blood flow

  • J. D. HumphreyEmail author
  • K. R. Rajagopal
Original Paper

Abstract

A sustained change in blood flow results in an arterial adaptation that can be thought to consist of two general steps: an immediate vasoactive response that seeks to return the wall shear stress to its homeostatic value, and a long-term growth and remodeling process that seeks to restore the intramural stresses and, if needed, the wall shear stress toward their homeostatic values. Few papers present mathematical models of arterial growth and remodeling in general, and fewer yet address flow-induced changes. Of these, most prior models build upon the concept of “kinematic growth” proposed by Skalak in the early 1980s (Skalak R (1981) In: Proceedings of the IUTAM Symposium on finite elasticity. Martinus Nijhoff, The Hague, pp 347–355). Such approaches address important consequences of growth and remodeling, but not the fundamental means by which such changes occur. In this paper, therefore, we present a new approach for mathematically modeling arterial adaptations and, in particular, flow-induced alterations. The model is motivated by observations reported in the literature and is based on a locally homogenized, constrained mixture theory. Specifically, we develop a 3-D constitutive relation for stress in terms of the responses of the three primary load-bearing constituents and their time-varying mass fractions, with the latter accounting for the kinetics of the turnover of cells and extracellular matrix in changing, stressed configurations. Of particular importance is the concept that the natural configurations of the individual constituents can evolve separately and that this leads to changes in the overall material properties and empirically inferred residual stress field of the vessel. Potential applications are discussed, but there is a pressing need for new, theoretically motivated data to allow the prescription of specific functional forms of the requisite constitutive relations and the values of the associated material parameters.

Keywords

Residual Stress Wall Shear Stress Circumferential Stress Density Production Individual Constituent 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work was supported, in part, by NSF grant BES-0084644 and NIH grants HL-64372 and HL-58856 (sub-contract from Duke University, M. Friedman, PI).

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Department of Biomedical Engineering and M.E. DeBakey InstituteTexas A&M UniversityCollege StationUSA
  2. 2.Departments of Mechanical Engineering and Biomedical EngineeringTexas A&M UniversityCollege StationUSA

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