Intraluminal thrombus (ILT) in abdominal aortic aneurysms (AAA) has potential implications to aneurysm growth and rupture risk; yet, the mechanisms underlying its development remain poorly understood. Some researchers have proposed that ILT development may be driven by biomechanical platelet activation within the AAA, followed by adhesion in regions of low wall shear stress. Studies have investigated wall shear stress levels within AAA, but platelet activation potential (AP) has not been quantified. In this study, patient-specific computational fluid dynamic (CFD) models were used to analyze stress-induced AP within AAA under rest and exercise flow conditions. The analysis was conducted using Lagrangian particle-based and Eulerian continuum-based approaches, and the results were compared. Results indicated that biomechanical platelet activation is unlikely to play a significant role for the conditions considered. No consistent trend was observed in comparing rest and exercise conditions, but the functional dependence of AP on stress magnitude and exposure time can have a large impact on absolute levels of anticipated platelet AP. The Lagrangian method obtained higher peak AP values, although this difference was limited to a small percentage of particles that falls below reported levels of physiologic background platelet activation.
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April 2015
Research-Article
Mechanical Platelet Activation Potential in Abdominal Aortic Aneurysms Available to Purchase
Kirk B. Hansen,
Kirk B. Hansen
Department of Mechanical Engineering,
Berkeley, CA 94720-1740
University of California
,5126 Etcheverry Hall
,Berkeley, CA 94720-1740
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Amirhossein Arzani,
Amirhossein Arzani
Department of Mechanical Engineering,
Berkeley, CA 94720-1740
University of California
,5126 Etcheverry Hall
,Berkeley, CA 94720-1740
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Shawn C. Shadden
Shawn C. Shadden
1
Department of Mechanical Engineering,
Berkeley, CA 94720-1740
e-mail: shadden@berkeley.edu
University of California
,5126 Etcheverry Hall
,Berkeley, CA 94720-1740
e-mail: shadden@berkeley.edu
1Corresponding author.
Search for other works by this author on:
Kirk B. Hansen
Department of Mechanical Engineering,
Berkeley, CA 94720-1740
University of California
,5126 Etcheverry Hall
,Berkeley, CA 94720-1740
Amirhossein Arzani
Department of Mechanical Engineering,
Berkeley, CA 94720-1740
University of California
,5126 Etcheverry Hall
,Berkeley, CA 94720-1740
Shawn C. Shadden
Department of Mechanical Engineering,
Berkeley, CA 94720-1740
e-mail: shadden@berkeley.edu
University of California
,5126 Etcheverry Hall
,Berkeley, CA 94720-1740
e-mail: shadden@berkeley.edu
1Corresponding author.
Manuscript received July 31, 2014; final manuscript received January 8, 2015; published online February 5, 2015. Assoc. Editor: Alison Marsden.
J Biomech Eng. Apr 2015, 137(4): 041005 (8 pages)
Published Online: April 1, 2015
Article history
Received:
July 31, 2014
Revision Received:
January 8, 2015
Online:
February 5, 2015
Citation
Hansen, K. B., Arzani, A., and Shadden, S. C. (April 1, 2015). "Mechanical Platelet Activation Potential in Abdominal Aortic Aneurysms." ASME. J Biomech Eng. April 2015; 137(4): 041005. https://doi.org/10.1115/1.4029580
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