Document Detail


Analysis of complex flow and the relationship between blood pressure, wall shear stress, and intima-media thickness in the human carotid artery.
MedLine Citation:
PMID:  17449549     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Previous clinical studies have observed relationships between increased intima-media thickness (IMT) in the carotid artery, elevated blood pressure, and low wall shear stress (WSS) calculated from the Poiseuille equation. This study used numerical methods to more accurately determine WSS in the carotid artery and to investigate possible determinants of increased IMT. METHODS: IMT [common carotid artery (CCA) and bulb], CCA flow velocity, brachial systolic (SBP) and diastolic blood pressure (DBP), and carotid systolic pressure (cSBP) were measured in 14 healthy subjects (aged 44 +/- 16 yr). Flow patterns in the carotid bifurcation were determined by computational fluid dynamics (CFD) based on three-dimensional ultrasound geometry. Instantaneous and time-averaged wall shear stress (WSS(av)), oscillatory shear index (OSI), and wall shear stress angle gradients (WSSAG) were calculated. RESULTS: IMT was positively related to SBP, DBP, cSBP, and WSSAG and inversely related to WSS(av) in the CCA. In the bulb, IMT was positively related to SBP and cSBP but was not significantly related to WSS(av) or WSSAG. IMT was unrelated to OSI in both the CCA and the bulb. CONCLUSION: Increased carotid artery IMT in healthy subjects with no evidence of focal plaques is primarily a response to elevated pressure.
Authors:
A D Augst; B Ariff; S A G McG Thom; X Y Xu; A D Hughes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-04-20
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  293     ISSN:  0363-6135     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-08-03     Completed Date:  2007-09-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H1031-7     Citation Subset:  IM    
Affiliation:
Department of Chemical Engineering, Faculty of Engineering, Imperial College London, UK.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Blood Pressure*
Brachial Artery / physiology
Carotid Artery, Common / physiology*,  ultrasonography
Female
Hemorheology
Humans
Image Interpretation, Computer-Assisted
Imaging, Three-Dimensional
Male
Middle Aged
Models, Cardiovascular*
Pulsatile Flow*
Reference Values
Regional Blood Flow
Stress, Mechanical
Time Factors
Tunica Intima* / ultrasonography
Tunica Media* / ultrasonography

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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