Abstract
Purpose
Abdominal Aortic Aneurysms (AAA) have extreme medical prevalence as an asymptomatic cause of death in developed countries. The probability of AAA rupture is promoted by the localized oxygen loss in the AAA wall which occurs in part because many AAAs contain a layer called intraluminal thrombus (ILT). Considering this strong clinical association, the purpose of this study is to investigate the key features that constitute to the oxygen diffusion, and therefore hypoxia in AAA.
Methods
A three-dimensional model of AAA containing ILT is created and numerical simulations are performed to simulate blood flow and oxygen distribution within the AAA. The model accounts for blood flow in the lumen and oxygen transport in the lumen, ILT, and arterial wall. The sub-model of the ILT is fully coupled with the wall sub-model as well as with the subdomain of the blood flow. The sensitivity of the oxygen flow with respect to the parameters of the problem is also analyzed.
Results
Model simulations are used to investigate the relation between AAA physical properties, hemodynamics, and oxygen concentration in different geometries of AAA. The results demonstrate that the diameter of the AAA bulge has little effect on the oxygen flow, but that the thickness of the ILT layer has a profound effect. Moreover, a significant sensitivity to the oxygen supply from vasa vasorum and its notable impact on oxygen transport within AAA are observed. The variability of the arterial wall oxygen concentration to the oxygen reaction rate remains however very low.
Conclusion
The presence of an ILT significantly impairs oxygen transport from the lumen to the wall. This study confirms that consideration of ILT size and anatomy may be important in considering the severity of a AAA, however, other parameters can also affect thrombus-mediated oxygen delivery within the aneurysmal wall.
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Acknowledgments
The Duquesne University departmental support and Faculty Development Fund for RZ is gratefully acknowledged. This research was supported in part by the University of Pittsburgh Center for Research Computing through the resources provided.
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RZ was responsible for project administration and designed the numerical simulations and methodology, wrote the first draft and revised the manuscript. TC, ND, and AG helped with data curation and visualization. All authors read and approved the submitted version of the manuscript.
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Associate Editor Kerem Pekkan oversaw the review of this article.
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Zakerzadeh, R., Cupac, T., Dorfner, N. et al. Coupled Hemodynamics and Oxygen Diffusion in Abdominal Aortic Aneurysm: A Computational Sensitivity Study. Cardiovasc Eng Tech 12, 166–182 (2021). https://doi.org/10.1007/s13239-020-00508-5
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DOI: https://doi.org/10.1007/s13239-020-00508-5