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Planar biaxial characterization of diseased human coronary and carotid arteries for computational modeling.

Abstract：

:Computational models have the potential to provide precise estimates of stresses and strains associated with sites of coronary plaque rupture. However, lack of adequate mathematical description of diseased human vessel wall mechanical properties is hindering computational accuracy. The goal of this study is to characterize the behavior of diseased human coronary and carotid arteries using planar biaxial testing. Diseased coronary specimens exhibit relatively high stiffness (50-210 kPa) and low extensibility (1-10%) at maximum equibiaxial stress (250 kPa) compared to human carotid specimens and values commonly reported for porcine coronary arteries. A thick neointimal layer observed histologically appears to be associated with heightened stiffness and the direction of anisotropy of the specimens. Fung, Choi-Vito and modified Mooney-Rivlin constitutive equations fit the multiaxial data from multiple stress protocols well, and parameters from representative coronary specimens were utilized in a finite element model with fluid-solid interactions. Computed locations of maximal stress and strain are substantially altered, and magnitudes of maximum principal stress (48-65 kPa) and strain (6.5-8%) in the vessel wall are lower than previously predicted using parameters from uniaxial tests. Taken together, the results demonstrate the importance of utilizing disease-matched multiaxial constitutive relationships within patient-specific computational models to accurately predict stress and strain within diseased coronary arteries.

journal_name

J Biomech

journal_title

Journal of biomechanics

authors

Kural MH,Cai M,Tang D,Gwyther T,Zheng J,Billiar KL

doi

10.1016/j.jbiomech.2011.11.019

subject

Has Abstract

pub_date

2012-03-15 00:00:00

pages

790-8

issue

5

eissn

0021-9290

issn

1873-2380

pii

S0021-9290(11)00701-9

journal_volume

45

pub_type

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