An Analytical Investigation into the Possibility of Gas Cavitation in the Circulation

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Abstract
On the basis that gas may be evolved from the blood at sub-atmospheric pressure, it is suggested that a type of cavitation (gas cavitation) sometimes occurs in the circulation, due to the pressure drop at a stenosis. The latter has been analysed, and a table is given showing the degree of stenosis necessary for cavitation to occur under a wide range of pressures and flows. The downstream pressures have also been calculated, and it is found that only in exceptional circumstances will they exceed the upstream ones, even at a very large post-stenotic dilatation. Gas cavitation is advanced as the cause of post-stenotic dilatation in the body, and also as the source of the vibration underlying circulatory bruits and thrills.

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