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Arterial Wall Shear and Distribution of Early Atheroma in Man

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Abstract

THE patchy distribution of fatty streaking and early atheroma has been associated with arterial blood mechanics. Mustard et al.1 have noted occurrence of atheroma at sites which are thought to experience particle (platelet) deposition as the result of local rapid flow fluctuations (turbulence) or eddies. Others have proposed platelet deposition in regions of flow separation2. Texon3 invoked damage due to Bernoulli-type suction forces in areas of locally increased blood velocity; but this is considered implausible because the forces are negligible in physiological conditions in comparison with normal variations of mean blood pressure. Mitchell and Schwartz4 reported the sparing of fatty streaking in localized areas, at which they suggest low wall shear rate (the product of velocity gradient and fluid viscosity) is experienced. Fry5,6 has shown that acute elevation of shear rate on the aortic wall causes endothelial damage and increased permeability to lipids. These theories assign to fluid mechanics a causative role in atherogenesis.

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Authors and Affiliations

  1. Physiological Flow Studies Unit, Imperial College, London

    C. G. CARO, J. M. FITZ-GERALD & R. C. SCHROTER

Authors
  1. C. G. CARO
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  2. J. M. FITZ-GERALD
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  3. R. C. SCHROTER
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CARO, C., FITZ-GERALD, J. & SCHROTER, R. Arterial Wall Shear and Distribution of Early Atheroma in Man. Nature 223, 1159–1161 (1969). https://doi.org/10.1038/2231159a0

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