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Coupled Hemodynamics and Oxygen Diffusion in Abdominal Aortic Aneurysm: A Computational Sensitivity Study.

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Intraluminal thrombus (ILT) thickness significantly impacts oxygen delivery in abdominal aortic aneurysms (AAA), potentially increasing rupture risk. Understanding ILT

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Area of Science:

  • Biomedical Engineering
  • Computational Fluid Dynamics
  • Medical Physics

Background:

  • Abdominal Aortic Aneurysms (AAA) are a major cause of mortality, often asymptomatic until rupture.
  • Localized oxygen loss (hypoxia) in the AAA wall is linked to rupture risk.
  • Intraluminal thrombus (ILT) is frequently present in AAAs and may contribute to hypoxia.

Purpose of the Study:

  • To investigate the key factors influencing oxygen diffusion and hypoxia within AAAs.
  • To understand the role of intraluminal thrombus (ILT) in AAA oxygen transport.
  • To analyze the relationship between AAA geometry, hemodynamics, and oxygen levels.

Main Methods:

  • Development of a 3D computational model of AAA with ILT.
  • Numerical simulations of blood flow and oxygen distribution.
  • Analysis of oxygen transport in the lumen, ILT, and arterial wall.
  • Sensitivity analysis of oxygen flow to various parameters.

Main Results:

  • AAA bulge diameter has minimal impact on oxygen flow.
  • ILT thickness significantly affects oxygen transport to the AAA wall.
  • Oxygen supply from vasa vasorum plays a crucial role in AAA oxygenation.
  • Arterial wall oxygen concentration shows low variability with reaction rates.

Conclusions:

  • Intraluminal thrombus (ILT) presence significantly hinders oxygen transport from the lumen to the AAA wall.
  • ILT size and anatomy are important considerations for AAA severity assessment.
  • Other parameters beyond ILT also influence thrombus-mediated oxygen delivery in AAAs.