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Chapter 7
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Scaling Laws of Coronary Vasculature
7.1 Introduction
As demonstrated in Chap. 2, the coronary vasculature is complex. A natural question arises as to whether the construction of the vasculature is random or if it follows some design principles. This question has been pondered for nearly a century and numerous investigations have attempted to explain the design of vascular trees based on various principles, including cost functions of energy (Murray, 1926; Rosen,
1967), surface area and volume (Kamiya & Togawa, 1972), tensile stress (Kurz &
Sandau, 1997), and shear force (Zamir, 1977). The major impetus for these inves­tigations was the desire to understand the structure/function of the coronary vascu­lature relation under homeostatic conditions. Pathological states of the vasculature may then be understood in relation to perturbations in homeostasis.
Although the morphogenesis of the vascular tree is likely to be determined by a preprogrammed genetic algorithm, a number of physical, chemical, and biological factors related to the functional needs of a particular tissue may determine the subsequent growth and remodeling during postnatal development. The nal vascular tree structures reect the changes brought about by natural selection and adaptation to the environment, which subsequently lead to the survival value of the structure. The design determinants of the coronary vasculature are undoubtedly multi-factorial and an analysis of their effects on structure and function is often non-trivial.
In this chapter, we provide a simplied yet comprehensive analysis of the design of coronary vasculature. The structural data is used to understand the function of the coronary vasculature (e.g., structure/function relationship), including the validated models of coronary blood ow described in Chaps. 5 and 6. Specic attention is placed o n the ZKM model, which expands Murrays original law (1926) from an individual vessel branch to a more generalized model that considers the entire vasculature, by using the minimum energy hypothesis along with conservation of energy. Experimental and computation validations of the ZKM model are provided. A more generalized theory is also considered that invokes the fractal nature of the
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coronary vascular trees that leads to scaling laws of ow resistance and volume, along with an experimental validation of scaling of myocardial mass.
7.2 Murrays Law
The most well-recognized structure–function relation based on a design principle of the vasculature was rst formulated by Murray in 1926, based on a minimum operation cost hypothesis (Murray, 1926). Energy expenditure is required for circu­lation because of frictional losses sustained during conduction of uid through a vascular network. The reduction in frictional losses by the use of larger caliber vessels must be balanced with the cost of metabolic maintenance of the blood volume (Murray, 1926) as well as passive and active aspects (e.g., media and smooth muscle cells) of the blood vessel wall (Liu & Kassab, 2007b). Murray proposed a cost function which consisted of a compromise between the frictional ow and metabolic blood cost, leading to a principle of economy or minimum energy expenditure. He derived an optimal condition for the relation between diameter (structure) and ow rate (function) in a vessel segment. Specically, Murrays law states that the ow rate is proportional to the cube of diameter, i.e., Q ¼ k Q and D are the volumetric ow rate and diameter of a vessel segment, respectively, and k
is a blood constant (see derivation in Appendix 1). Murrays diameter–ow
b
relation in conjunction with conservation of mass at a bifurcation leads to the well­known diameter relation: the cube of the diameter of a mother vessel equals the sum of the cubes of the diameters of the daughters (Murray, 1926).
Murrays law predicts a universal exponent which is invariant (3.0) for all trees whose internal ows obey laminar conditions. Fifty years after the formulation of Murrays law, Uylings (1977) argued that the exponent can vary in the range of
2.33–3.0 depending on whether the ow is turbulent (2.33) or laminar (3.0). Numerous papers have been published in the past 90 years on Murrays law and on the validation of the exponent (see review in Kassab (2006) and Sherman (1981)). The studies show some support but with signicant scatter. Sherman (1981) reviewed the literature on Murrays law and concluded that it is not obeyed in the most proximal bifurcations of aorta, the pulmonary trunk, the vena cavae, or the pulmonary veins. In the section below, we review studies by our group which show that Murrays exponent of 3 only holds for the small coronar y arteriolar vessels (<50 μm; orders <5) but does not hold for the larger coronary vasculature. These results prompted a more generalized formulation for the entire coronary vasculature, as described in the following section.
D3where
b