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Effects of Flow-Diverting Device Oversizing on Hemodynamics Alteration in Cerebral Aneurysms.
MedLine Citation:
PMID:  22555581     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND AND PURPOSE:Flow-diverting devices are increasingly being considered for large or giant aneurysms with wide necks, which are difficult to treat with coils or clips. These devices are often oversized to achieve good positioning against the artery wall. The objective of this study was to analyze the effect of oversized flow-diverting devices in altering aneurysmal flows and creating hemodynamic environments favorable for thrombosis and aneurysm occlusion.MATERIALS AND METHODS:Patient-specific computational fluid dynamics models of 3 cerebral aneurysms were constructed from 3D angiography images. Numeric simulations of the hemodynamics after implanting stents of increasing diameters were performed. The corresponding modifications of hemodynamic variables such as aneurysm inflow rate, average velocity, shear rate, and wall shear stress were calculated and compared.RESULTS:The results indicate that because the devices are oversized, the stent cells stretch in the direction of the vessel axis, change cell angles, and result in larger cells. This change in the cell geometry causes a diminution of the hemodynamic performance of the stent. Quantitatively, stent oversizing results in larger values of aneurysm inflow rates, average velocity, shear rate, and wall shear stress compared with nonoversizing cases.CONCLUSIONS:The efficacy of flow-diverting devices in modifying intra-aneurysmal flow can be substantially reduced by oversizing the devices. As the level of device oversize increases, aneurysmal hemodynamic variables are significantly less affected.
Authors:
F Mut; J R Cebral
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-3
Journal Detail:
Title:  AJNR. American journal of neuroradiology     Volume:  -     ISSN:  1936-959X     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003708     Medline TA:  AJNR Am J Neuroradiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Center for Computational Fluid Dynamics, College of Science, George Mason University, Fairfax, Virginia.
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