Vein maladaptation, leading to poor long-term patency, is a serious clinical problem in patients receiving coronary artery bypass grafts (CABGs) or undergoing related clinical procedures that subject veins to elevated blood flow and pressure. We propose a computational model of venous adaptation to altered pressure based on a constrained mixture theory of growth and remodeling (G&R). We identify constitutive parameters that optimally match biaxial data from a mouse vena cava, then numerically subject the vein to altered pressure conditions and quantify the extent of adaptation for a biologically reasonable set of bounds for G&R parameters. We identify conditions under which a vein graft can adapt optimally and explore physiological constraints that lead to maladaptation. Finally, we test the hypothesis that a gradual, rather than a step, change in pressure will reduce maladaptation. Optimization is used to accelerate parameter identification and numerically evaluate hypotheses of vein remodeling.
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March 2015
Research-Article
Computational Simulation of the Adaptive Capacity of Vein Grafts in Response to Increased Pressure
Abhay B. Ramachandra,
Abhay B. Ramachandra
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
University of California San Diego
,9500 Gilman Drive
,La Jolla, CA 92093
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Sethuraman Sankaran,
Sethuraman Sankaran
Senior Computational Scientist HeartFlow, Inc.
,1400 Seaport Blvd., Building B
,Redwood City, CA 94063
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Jay D. Humphrey,
Jay D. Humphrey
Department of Biomedical Engineering,
Yale University
,55 Prospect Street
,New Haven, CT 06520
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Alison L. Marsden
Alison L. Marsden
1
Department of Mechanical
and Aerospace Engineering,
e-mail: amarsden@ucsd.edu
and Aerospace Engineering,
University of California San Diego
,9500 Gilman Drive
,La Jolla, CA 92093
e-mail: amarsden@ucsd.edu
1Corresponding author.
Search for other works by this author on:
Abhay B. Ramachandra
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
University of California San Diego
,9500 Gilman Drive
,La Jolla, CA 92093
Sethuraman Sankaran
Senior Computational Scientist HeartFlow, Inc.
,1400 Seaport Blvd., Building B
,Redwood City, CA 94063
Jay D. Humphrey
Department of Biomedical Engineering,
Yale University
,55 Prospect Street
,New Haven, CT 06520
Alison L. Marsden
Department of Mechanical
and Aerospace Engineering,
e-mail: amarsden@ucsd.edu
and Aerospace Engineering,
University of California San Diego
,9500 Gilman Drive
,La Jolla, CA 92093
e-mail: amarsden@ucsd.edu
1Corresponding author.
Manuscript received March 21, 2014; final manuscript received October 17, 2014; published online January 29, 2015. Assoc. Editor: Kristen Billiar.
J Biomech Eng. Mar 2015, 137(3): 031009 (10 pages)
Published Online: March 1, 2015
Article history
Received:
March 21, 2014
Revision Received:
October 17, 2014
Online:
January 29, 2015
Citation
Ramachandra, A. B., Sankaran, S., Humphrey, J. D., and Marsden, A. L. (March 1, 2015). "Computational Simulation of the Adaptive Capacity of Vein Grafts in Response to Increased Pressure." ASME. J Biomech Eng. March 2015; 137(3): 031009. https://doi.org/10.1115/1.4029021
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