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Correlation between intimal thickness and fluid shear in human arteries
Atherosclerosis
|June 1, 1981
Summary
Pulsatile blood flow and shear stress may inhibit intimal thickening, a key factor in atherosclerosis. Higher pulse shear rates correlated with reduced intimal thickness and sudanophilia in an aortic cast study.
Area of Science:
- Biomedical Engineering
- Cardiovascular Physiology
- Pathology
Background:
- Intimal thickening is a hallmark of atherosclerosis.
- Understanding the biomechanical factors influencing intimal thickening is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the relationship between wall shear rate and intimal thickening in an aortic bifurcation cast.
- To explore the correlation between pulse shear rate and atherosclerotic markers.
Main Methods:
- A realistic pulsatile flow was simulated in a cast of a human aortic bifurcation.
- Laser Doppler anemometry measured fluid velocities at multiple sites.
- Intimal thickness and sudanophilia were assessed in the corresponding native vessel.
Main Results:
- A negative correlation was observed between intimal thickness and wall shear rate.
- Pulse shear rate showed a strong negative correlation with intimal thickness (P < 0.005).
- Sudanophilia also correlated negatively with pulse shear rate (P < 0.01).
Conclusions:
- High-amplitude, low-level shear stress excursions may play a protective role by inhibiting intimal thickening.
- These findings suggest biomechanical forces influence atherosclerotic progression at the arterial wall interface.