Circulatory Dynamics across the Stenotic Mitral Valve Orifice

概要

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Considering the configulation of the stenotic mitral valve orifice as a sort of pipe orifice in the hydraulic system, the above-mentioned formula has been derived from the usual form of continuity equation and energy equation. Vena contracta has not been cuased by the configulation of mitral orifice in about fifty-one percent of mitral stenosis. This result is different from Gorlin's one. The reasons why vena contracta was not brought about in the small mitral valve orifice as follow; the greater part of the mitral valve orifices were situated downward from the annulus and considered as so-called nozzled shape; there are little precision in the measurement of blood flow and pressure; mitral valve orifices themselves have various configulations. And so flow coefficient C is not constant such as Gorlin's formula, but a function of Reynolds number and throat area ratio. This coefficient is attributable to the configulation of the mitral orifice, the velocity of mitral valve flow and the viscosity of blood flow.
社団法人日本循環器学会の論文
1973-10-20