Why the study?
Does the tapering degree of an arterial stenosis affect the pressure drop under steady flow conditions?
Does the tapering degree of an arterial stenosis affect the pressure drop under steady flow conditions?
In arterial stenosis models, the upstream-middle pressure drop is driven by area reduction rather than tapering degree and can be predicted by the momentum equation.
Answers are grounded in this paper and cite their sources.
Area reduction, not tapering, drives upstream pressure drop in stenosis models; hypothesis-generating for clinical FFR refinement.
Measures of pressure drops were made in two different plexiglass models of axial-symmetric arterial stenoses. The stenosis models had the same area reduction (86 percent) but were of different length so as to have a different tapering degree. Pressures were measured in steady flow condition at three equidistant points of the stenosis: upstream, in the middle, and downstream. Results indicate that: the upstream-middle pressure drop is independent of tapering degree but is highly influenced by area reduction; moreover it is much greater than the middle-downstream drop. The upstream-middle pressure drop can be accurately predicted by means of a relationship deduced by the momentum equation.
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Cavalcanti et al. (1992) studied this question.
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