Document Detail

Direct numerical simulation of transitional flow in a stenosed carotid bifurcation.
MedLine Citation:
PMID:  18656199     Owner:  NLM     Status:  MEDLINE    
The blood flow dynamics of a stenosed, subject-specific, carotid bifurcation were numerically simulated using the spectral element method. Pulsatile inlet conditions were based on in vivo color Doppler ultrasound measurements of blood velocity. The results demonstrated the transitional or weakly turbulent state of the blood flow, which featured rapid velocity and pressure fluctuations in the post-stenotic region of the internal carotid artery (ICA) during systole and laminar flow during diastole. High-frequency vortex shedding was greatest downstream of the stenosis during the deceleration phase of systole. Velocity fluctuations had a frequency within the audible range of 100-300Hz. Instantaneous wall shear stress (WSS) within the stenosis was relatively high during systole ( approximately 25-45Pa) compared to that in a healthy carotid. In addition, high spatial gradients of WSS were present due to flow separation on the inner wall. Oscillatory flow reversal and low pressure were observed distal to the stenosis in the ICA. This study predicts the complex flow field, the turbulence levels and the distribution of the biomechanical stresses present in vivo within a stenosed carotid artery.
Seung E Lee; Sang-Wook Lee; Paul F Fischer; Hisham S Bassiouny; Francis Loth
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-07-24
Journal Detail:
Title:  Journal of biomechanics     Volume:  41     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-04     Completed Date:  2008-10-03     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2551-61     Citation Subset:  IM    
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
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MeSH Terms
Blood Flow Velocity / physiology
Carotid Stenosis / physiopathology*
Computer Simulation*
Grant Support
2R01HL55296-04A2/HL/NHLBI NIH HHS; R01 HL055296-04A2/HL/NHLBI NIH HHS; R01 HL055296-05/HL/NHLBI NIH HHS; R01 HL055296-06/HL/NHLBI NIH HHS; R01 HL055296-07/HL/NHLBI NIH HHS

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