Mechanical Platelet Activation Potential in Abdominal Aortic Aneurysms

Kirk B. Hansen, Amirhossein Arzani, Shawn C. Shadden

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number041005
JournalJournal of Biomechanical Engineering
Volume137
Issue number4
DOIs
StatePublished - Apr 1 2015
Externally publishedYes

Keywords

  • abdominal aortic aneurysm
  • advection-diffusion-reaction
  • blood damage
  • computational fluid dynamics
  • Lagrangian particle tracking
  • platelet activation
  • thrombosis

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)

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