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Research ArticleNeurointervention
Open Access

Quantitative Characterization of the Hemodynamic Environment in Ruptured and Unruptured Brain Aneurysms

J.R. Cebral, F. Mut, J. Weir and C. Putman
American Journal of Neuroradiology January 2011, 32 (1) 145-151; DOI: https://doi.org/10.3174/ajnr.A2419
J.R. Cebral
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F. Mut
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J. Weir
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C. Putman
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Abstract

BACKGROUND AND PURPOSE: Hemodynamics are thought to play an important role in the mechanisms of aneurysm pathogenesis, progression, and rupture. The purpose of this study was to define quantitative measures related to qualitative flow characteristics previously analyzed and to investigate their relationship to aneurysm rupture.

MATERIALS AND METHODS: The hemodynamic environments in 210 cerebral aneurysms were analyzed by using image-based CFD under different flow conditions. Quantitative hemodynamic variables were defined and extracted from the simulation results. A statistical analysis of the relationship to the previous history of aneurysm rupture was performed, and the variability with flow conditions was assessed.

RESULTS: Ruptured aneurysms were more likely to have larger inflow concentrations, larger MWSS, larger shear concentrations, and lower viscous dissipation ratios than unruptured aneurysms. Areas under low WSS and measures of abnormally low shear force distributions of ruptured and unruptured aneurysms were not statistically different. Although the values of hemodynamic quantities changed with different flow conditions, the statistical differences or ratios between their mean values over the ruptured and unruptured groups were maintained, for both pulsatile and steady flows.

CONCLUSIONS: Concentrated inflow streams and WSS distributions with elevated levels of MWSS and low aneurysmal viscous dissipation are statistically associated with a clinical history of prior aneurysm rupture. In contrast, the area and total viscous shear force applied in the aneurysm region subjected to abnormally low WSS levels are not. This study highlights the potential for image-based CFD for investigating aneurysm-evolution mechanisms and for clinical assessment of aneurysm risks.

Abbreviations

bpm
beats per minute
CFD
computational fluid dynamics
3DRA
3D rotational angiography
HR
heart rate
ICI
inflow concentration index
KER
kinetic energy ratio
LSA
low shear area
LSI
low shear index
MWSS
maximum WSS
SCI
shear concentration index
VDR
viscous dissipation ratio
WSS
wall shear stress
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American Journal of Neuroradiology: 32 (1)
American Journal of Neuroradiology
Vol. 32, Issue 1
1 Jan 2011
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J.R. Cebral, F. Mut, J. Weir, C. Putman
Quantitative Characterization of the Hemodynamic Environment in Ruptured and Unruptured Brain Aneurysms
American Journal of Neuroradiology Jan 2011, 32 (1) 145-151; DOI: 10.3174/ajnr.A2419

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Quantitative Characterization of the Hemodynamic Environment in Ruptured and Unruptured Brain Aneurysms
J.R. Cebral, F. Mut, J. Weir, C. Putman
American Journal of Neuroradiology Jan 2011, 32 (1) 145-151; DOI: 10.3174/ajnr.A2419
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