On the importance of tunica intima in the aging aorta: a three-layered in silico model for computing wall stresses in abdominal aortic aneurysms

Layer-specific experimental data for human aortic tissue suggest that, in aged arteries and arteries with non-atherosclerotic intimal thickening, the innermost layer of the aorta increases significantly its stiffness and thickness, becoming load-bearing. However, there are very few computational stu...

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Bibliographic Details
Published in:Computer methods in biomechanics and biomedical engineering 2021-07, Vol.24 (5), p.467-484
Main Authors: de Lucio, Mario, García, Marcos Fernández, García, Jacobo Díaz, Rodríguez, Luis Esteban Romera, Marcos, Francisco Álvarez
Format: Article
Language:English
Subjects:
abdominal aortic aneurysm
Aging
Aorta
Aortic aneurysms
Arterial wall mechanics
Arteries
Arteriosclerosis
Atherosclerosis
Computer applications
Coronary vessels
Finite element method
Mathematical models
Mechanical properties
Multilayers
Numerical models
Stiffness
Stresses
Thickening
tunica intima
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Summary:Layer-specific experimental data for human aortic tissue suggest that, in aged arteries and arteries with non-atherosclerotic intimal thickening, the innermost layer of the aorta increases significantly its stiffness and thickness, becoming load-bearing. However, there are very few computational studies of abdominal aortic aneurysms (AAAs) that take into account the mechanical contribution of the three layers that comprise the aneurysmal tissue. In this paper, a three-layered finite element model is proposed from the simplest uniaxial stress state to geometrically parametrized models of AAAs with different asymmetry values. Comparisons are made between a three-layered artery wall and a mono-layered intact artery, which represents the complex behavior of the aggregate adventitia-media-intima in a single layer with averaged mechanical properties. Likewise, the response of our idealized geometries is compared with similar experimental and numerical models. Finally, the mechanical contributions of adventitia, media and intima are analyzed for the three-layered aneurysms through the evaluation of the mean stress absorption percentage. Results show the relevance and necessity of considering the inclusion of tunica intima in multi-layered models of AAAs for getting accurate results in terms of peak wall stresses and displacements.
ISSN:1025-5842
1476-8259
DOI:10.1080/10255842.2020.1836167