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Impact of aneurysmal geometry on intraaneurysmal flow: a computerized flow simulation study.

Istvan Szikora¹, Gyorgy Paal, Adam Ugron

¹Interventional Neuroradiology, National Institute of Neurosurgery, Budapest, Hungary. h13424szi@ella.hu

|January 9, 2008

Summary

Intracranial aneurysm geometry influences intraaneurysmal flow. Aneurysms with axes parallel to the parent artery exhibit jet flow and uneven pressure, potentially increasing rupture risk compared to those with perpendicular axes.

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Area of Science:

Biomedical Engineering
Fluid Dynamics
Neurosurgery

Background:

Intracranial aneurysms pose significant health risks.
Understanding factors influencing aneurysm natural history is crucial.
Aneurysm geometry's role in hemodynamic parameters requires further investigation.

Purpose of the Study:

To assess how intracranial aneurysm geometry affects intraaneurysmal flow pressure and shear stress.
To correlate aneurysm geometry with flow patterns and pressure/shear stress distribution.
To investigate the relationship between aneurysm geometry, flow dynamics, and rupture status.

Main Methods:

Simulated blood flow in 21 aneurysms using finite volume modeling.
Classified aneurysms into side-wall and bifurcation types, with varying axis orientations.
Categorized flow patterns as jet or vortex, and analyzed pressure/shear stress distribution.

Main Results:

Vortex flow dominated side-wall and perpendicular-axis bifurcation aneurysms; jet flow was prevalent in parallel-axis bifurcation aneurysms.
Jet flow correlated with uneven pressure distribution, while vortex flow tended towards even pressure distribution.
Aneurysms with a parallel axis showed a higher rupture rate (4/7) compared to those with a perpendicular axis (1/14).

Conclusions:

Aneurysm geometry significantly impacts intraaneurysmal flow conditions.
Parallel-axis aneurysms tend to exhibit jet flow and uneven pressure, suggesting a higher rupture risk.
Further research into geometric factors influencing aneurysm hemodynamics is warranted for improved clinical management.