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Pulsatile flow through a bifurcation with a cerebrovascular aneurysm
T M Liou1, T W Chang, W C Chang
1Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China.
Journal of Biomechanical Engineering
|February 1, 1994
Summary
This study reveals critical bifurcation angles in cerebrovascular aneurysm models. Flow patterns indicate thrombosis risk at lower angles and progression or rupture risk at higher angles, especially with uneven blood flow.
Area of Science:
- Biomedical Engineering
- Fluid Dynamics
- Cerebrovascular Research
Background:
- Cerebrovascular aneurysms pose significant health risks.
- Understanding intra-aneurysmal hemodynamics is crucial for predicting aneurysm fate.
- Bifurcation geometry significantly influences blood flow patterns.
Purpose of the Study:
- To investigate the impact of bifurcation angles on hemodynamics within aneurysm models.
- To correlate flow characteristics with aneurysm progression, rupture, or thrombosis.
- To identify critical angles influencing aneurysm stability.
Main Methods:
- Laser-Doppler velocimetry and flow visualization were employed.
- Experiments were conducted in pulsatile and steady flow cerebrovascular aneurysm models.
- Varying bifurcation angles (60°, 90°, 140°) and flow rate ratios were analyzed.
Main Results:
- Increased bifurcation angle correlated with higher intra-aneurysmal flow activity and wall stress under uneven flow.
- A critical bifurcation angle was identified: below it, thrombosis is likely; above it, progression or rupture is more probable.
- Evenly distributed branch flow resulted in sluggish intra-aneurysmal flow, predisposing to thrombosis across all angles.
Conclusions:
- Bifurcation angle is a critical determinant of cerebrovascular aneurysm behavior.
- Uneven flow exacerbates risks associated with specific bifurcation angles.
- Hemodynamic analysis can inform clinical risk stratification for aneurysms.