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Topographical study on arteriosclerotic lesions at the bifurcations of human cerebral arteries
Insights
Arteriosclerotic lesions in human brain artery bifurcations are more common where blood flow shear stress is low. This suggests low shear stress is key in initiating and locating these arterial disease lesions.
Area of Science:
- Neuroscience
- Cardiovascular Science
- Biomedical Engineering
Background:
- Arteriosclerosis, a disease causing arterial hardening, commonly affects major brain arteries.
- Understanding lesion distribution in cerebral artery bifurcations is crucial for preventing strokes.
Purpose of the Study:
- To investigate the topographical distribution of arteriosclerotic lesions in human internal carotid and middle cerebral artery bifurcations.
- To explore the relationship between lesion patterns and hemodynamic factors, specifically wall shear stress.
Main Methods:
- Analysis of arteriosclerotic lesion distribution in human internal carotid bifurcation and middle cerebral artery-first temporal branch bifurcations.
- Correlation of lesion incidence with presumed low wall shear stress regions.
Main Results:
- Lesions predominantly occurred on outer walls and inner curvatures of daughter vessels at bifurcations.
- Distinct lesion distribution patterns were observed between the internal carotid bifurcation and the first bifurcation of the middle cerebral artery.
- These patterns align with areas of believed low wall shear stress.
Conclusions:
- Lower wall shear stress plays a significant role in the initiation and localization of arteriosclerotic lesions.
- Further research into 3D blood vessel architecture and flow patterns is necessary to fully elucidate the role of hemodynamics in atherogenesis.
Abstract:
We have studied the topographical distribution of arteriosclerotic lesions at the bifurcation of the internal carotid-anterior cerebral-middle cerebral arteries (internal carotid bifurcation) and of the middle cerebral artery-first temporal branch (first bifurcation of M.C.A.) in humans. The arteriosclerotic lesions showed a distinct pattern with a high incidence on the outer walls of the daughter vessels and at the inner curvatures in the bifurcations where wall shear stress was believed to be relatively low. However, there were differences in the distribution of the lesions between the internal carotid bifurcations and the first bifurcations of M.C.A.. The former are considered to be three-dimensionally unsymmetrical and curved, and the latter symmetrical and straight. The present study suggests that lower shear stress is of considerable importance in both the initiation and localization of arteriosclerotic lesions, and that study of the three-dimensional blood vessel architecture and blood flow patterns needs to be done to clarify the role of hemodynamic forces in atherogenesis.