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Related Experiment Videos

Flow patterns in dog aortic arch under a steady flow condition simulating mid-systole

S Endo1, Y Sohara, T Karino

  • 1Department of Thoracic and Cardiovascular Surgery, Jichi Medical School, Tochigi, Japan.

Heart and Vessels
|January 1, 1996
PubMed
Summary

Blood flow patterns in the aortic arch, specifically low wall shear stress regions, may predict where atherosclerosis develops. These findings in dogs suggest similar mechanisms in humans.

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Area of Science:

  • Cardiovascular Science
  • Biomedical Engineering
  • Pathophysiology

Background:

  • Atherosclerosis is a significant human disease.
  • Understanding the relationship between blood flow and atherosclerosis is crucial for prevention and treatment.
  • Localized pathogenesis in the aortic arch is not fully understood.

Purpose of the Study:

  • To investigate the connection between blood flow dynamics and the development of atherosclerosis in the aortic arch.
  • To analyze flow patterns, axial velocity, and wall shear stress in the aortic arch.

Main Methods:

  • Utilized flow visualization and high-speed cinemicrography.
  • Studied transparent dog aortic arch models under simulated physiologic flow conditions (Reynolds numbers 700-1600).
  • Identified flow components: parallel flow, clockwise rotational flow, and side branch flow.

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Main Results:

  • Observed slow, spiral secondary, and recirculation flows along the left anterior wall and at side branch entrances.
  • Identified a single helical flow pattern in the aortic arch.
  • Located regions of low wall shear stress at side branch entrances and along the left ventral wall.

Conclusions:

  • Low wall shear stress regions, characterized by specific flow patterns, are potential sites for atherosclerotic lesion development.
  • Findings in dogs suggest that similar hemodynamic factors contribute to atherosclerosis in the human aortic arch.
  • This study provides insights into the localized pathogenesis of atherosclerosis driven by hemodynamics.