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Computational fluid dynamic analysis of intracranial aneurysmal bleb formation
Jeremy H Russell1, Neil Kelson, Mark Barry
1*Kenneth Jamieson Department of Neurosurgery, Royal Brisbane and Women's Hospital, Brisbane, Australia; ‡Department of Information Technology Services (High Performance Computing), §School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Australia; ¶School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, Australia.
Cerebral aneurysm blebs often form near high wall shear stress (WSS) points, indicating WSS may predict rupture risk. Computational fluid dynamics (CFD) analysis helps assess this risk in unruptured aneurysms.
Area of Science:
- Neurosurgery
- Biomedical Engineering
- Medical Imaging
Background:
- Management of unruptured aneurysms is debated, influenced by size and shape.
- Aneurysmal blebs are linked to increased rupture risk.
Purpose of the Study:
- Correlate computational fluid dynamics (CFD) indices with cerebral aneurysm bleb formation.
- Investigate hemodynamic factors associated with bleb development.
Main Methods:
- Constructed 3D models from angiography data for 27 aneurysms with blebs.
- Created pre-bleb models by digitally removing blebs.
- Analyzed CFD parameters including flow structure, wall shear stress (WSS), pressure, and oscillatory shear index (OSI).
Main Results:
- Bleb location significantly associated with maximal WSS (74%, P=.019).
- Blebs were linked to inflow/outflow jets in 89% of cases (P<.001).
- Bleb regions showed significantly lower WSS post-formation (96%, P<.001).
Conclusions:
- Cerebral aneurysm blebs typically form at or near maximal WSS, aligned with flow structures.
- Wall pressure and OSI are not primary determinants of bleb location.
- CFD-derived WSS measurements may predict bleb formation and improve unruptured aneurysm rupture risk assessment.
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