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A new method for evaluation of the degree of stenosis using a cathether-tip velocity/pressure transducers Shizuo Hanya 1 , Hiroshi Inage 2 , Akira Ishihara 1 , Motoaki Sugawara 3 1Dept. of Thoracic & Cardiovascular Surgery, Kitasato Univ. 2Dept. of Clinical Laboratory, Kitasato Univ. 3Dept. of Surgical Science, Heart Institute of Japan, Tokyo Women's Medical College pp.667-673
Published Date 1981/6/15
DOI https://doi.org/10.11477/mf.1404203794
  • Abstract
  • Look Inside

The degree of aortic or pulmonary stenosis is conventionally evaluated by the pressure gradient across the stenosis. However, the pressure grad-ient strongly depends on the blood velocity, and consequently changes with the change of cardiac output. In the field of fluid dynamics, the commonly used index indicating the degree of resistance to flow is the pressure loss coeffic-ient,which is nearly independent of the fluid velocity when the Rynolds number of the flow is sufficiently high.

To apply the pressure loss coefficient to the evaluation of cardiovascular stenosis, it is neces-sary to measure both the pressure gradient and the blood velocity. In patients with aortic or pulmonary stenosis, the pressure and the velo-city of the blood were measured simultaneously with pressure tranceducers and an electro-magnetic velocity probe mounted near the tip of a catheter.


Copyright © 1981, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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