Simulation of the interaction between blood flow and atherosclerotic plaque

Li, Z. Y. & Gillard, J. H. (2007) Simulation of the interaction between blood flow and atherosclerotic plaque. In 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2007. EMBS 2007, IEEE, Lyon, France, 01699-1702.

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Abstract

It has been well accepted that over 50% of cerebral ischemic events are the result of rupture of vulnerable carotid atheroma and subsequent thrombosis. Such strokes are potentially preventable by carotid interventions. Selection of patients for intervention is currently based on the severity of carotid luminal stenosis. It has been, however, widely accepted that luminal stenosis alone may not be an adequate predictor of risk. To evaluate the effects of degree of luminal stenosis and plaque morphology on plaque stability, we used a coupled nonlinear time-dependent model with flow-plaque interaction simulation to perform flow and stress/strain analysis for stenotic artery with a plaque. The Navier-Stokes equations in the Arbitrary Lagrangian-Eulerian (ALE) formulation were used as the governing equations for the fluid. The Ogden strain energy function was used for both the fibrous cap and the lipid pool. The plaque Principal stresses and flow conditions were calculated for every case when varying the fibrous cap thickness from 0.1 to 2mm and the degree of luminal stenosis from 10% to 90%. Severe stenosis led to high flow velocities and high shear stresses, but a low or even negative pressure at the throat of the stenosis. Higher degree of stenosis and thinner fibrous cap led to larger plaque stresses, and a 50% decrease of fibrous cap thickness resulted in a 200% increase of maximum stress. This model suggests that fibrous cap thickness is critically related to plaque vulnerability and that, even within presence of moderate stenosis, may play an important role in the future risk stratification of those patients when identified in vivo using high resolution MR imaging.

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3 citations in Web of Science®

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ID Code: 90363
Item Type: Conference Paper
Refereed: No
DOI: 10.1109/IEMBS.2007.4352636
ISBN: 9781424407873
ISSN: 1557-170X
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Coypright 2007 IEEE
Deposited On: 30 Nov 2015 07:19
Last Modified: 04 Dec 2015 03:45

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