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164 3 Mechanical Properties and Microstructure of the Coronary Vasculature
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Chapter 4
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Constitutive Models of Coronary Vasculature
4.1 Introduction
The signicance of mechanical stresses and strains in biology, physiology, and pathology is well recognized. Although deformations or strains can be measured, there is no instrument or method to measure stresses. Stresses must be calculated from the constitutive equation, i.e., stress–strain relationship. The constitutive rela­tion of the vessel wall is seminal to hemodynamics, wave propagation, distensibility of arteries, plaque stability and rupture, as well as to vascular growth and remodeling.
In this chapter, constitutive elastic and viscoelastic models are provided. Finite strain micromechanics is introduced, and two homogenization methods are pro­vided. Three types of microstructure-based models of soft tissues are compared in relation to their assumptions and micromechanical structural basis, i.e., (1) uniform­eld models with uid-like matrix, (2) uniform-eld models with solid-like matrix, and (3) Second-order estimate models. Final ly, microstructural models of coronary artery layers (media and adventitia) are highlighted.
4.2 Phenomenological Constitutive Models
4.2.1 Shear Modulus
On the epicardial surface of the heart, the large coronary arteries experience signif­icant extensions and torsion in the axial direction due to changes in the shape and size of the heart during the cardiac cycle (Dobrin, 1978; Pao, Lu, & Ritman, 1992; Waldman, Fung, & Covell, 1985). Therefore, the study of the shear properties of these vessels is important for understanding coronary physiology and patho­physiology. Lu, Yang, Zhao, Gregersen, and Kassab (2003) determined the
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dependence of the shear modulus on the pressure, circumferential stress, longitudinal stretch and stress. The intact coronary segment is mounted on the cannulae of the triaxial machine as shown in Fig. 3.15 (Chap. 3). In the protocol of triaxial mea­surements (Chap. 3), the longitudinal stretch ratio (λ
) is varied from 1 to 1.4 in
z
increments of 0.1. The transmural pressure (P) is set at various pressures at each λ At each λ
and pressure, a ramp of twist is performed from 0to 25, and 0to 25.
z
The direct measurements show that the shear stress is linearly related to the shear strain, i.e., the shear modulus does not depend on the shear stress or strain (Lu et al.,
2003). Furthermore, the relation between torque and twist rate is linear at the
ination and longitudinal extensions examined for the intact wall, media, and adventitia. The dependence of the shear modulus on the circumferential strains, however, is nonlinear. Table 4.1 (Appendix 1) summarizes the data on the linear regressions between shear modulus and circumferential stress for the measured intact left anterior descending (LAD) and right coronary artery (RCA) arteries and their media. The shear modulus of the adventitia is found to be greater than that of the intact vessel which is greater than that of the media. This relationship is expressed by Eq. (4.7) (Appendix 1) which states that the product of the polar moment of inertia and shear modulus of the intact vessel is equal to the sum of the products of the polar moment of inertia and shear modulus of each of the two layers as validated by the experimental data.
Although the coronary arterial vascular smooth muscle is reported as a helical structure in the media (Rhodin, 1980), the direction of twist (clockwise versus counterclockwise) is not found to be statistically signicant for the range of pres­sures and longitudinal stretch ratios examined. Furthermore, there is no statistically signicant differences in the values of shear moduli between RCA and LAD artery at
λ
¼ 1.4 (physiological longitudinal stretch).
z
The above data on coronary torsion or medial–adventitial shear have important implications for physiology and pathology of the coronary arterial wall. For exam­ple, the two layers are innervated by baroreceptors which are stimulated by defor­mation and perfused by small blood vessels called vasa vasorum. Shear forces at the media–adventitia border may stimulate the mechanoreceptors by mechanical defor­mation as well as affect the vascular geometry of the vasa vasorum and hence the blood perfusion of the vessel wall. Kwon et al. (1998) used micro-CT to study the anatomy of the vasa vasorum in the porcine coronary arteries. They demonstrated that the vasa vasorum originates from the lumen of the coronary artery and runs longitudinally along the medial–adventitial border. Hence, if the transmural forces at the border become abnormally high, they may collapse the vasa vasorum and cause ischemia of the vessel wall which may lead to coronary artery disease or arterio­sclerosis (Ritman & Lerman, 2007). Furthermore, signicant differential torsional stresses at the media–adventitia border during percutaneous coronary intervention may lead to coronary artery dissection.
.
z