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POLZER, S. GASSER, T. MARKERT, B. BURŠA, J. SKÁCEL, P.
Original Title
Impact of poroelasticity of intraluminal thrombus on wall stress of abdominal aortic aneurysms
Type
journal article - other
Language
English
Original Abstract
Background The predictions of stress fields in Abdominal Aortic Aneurysm (AAA) depend on constitutive descriptions of the aneurysm wall and the Intra-luminal Thrombus (ILT). ILT is a porous diluted structure (biphasic solid–fluid material) and its impact on AAA biomechanics is controversially discussed in the literature. Specifically, pressure measurements showed that the ILT cannot protect the wall from the arterial pressure, while other (numerical and experimental) studies showed that at the same time it reduces the stress in the wall. Method To explore this phenomenon further a poroelastic description of the ILT was integrated in Finite Element (FE) Models of the AAA. The AAA model was loaded by a pressure step and a cyclic pressure wave and their transition into wall tension was investigated. To this end ILTs permeability was varied within a microstructurally motivated range. Results The two-phase model verified that the ILT transmits the entire mean arterial pressure to the wall while, at the same time, it significantly reduces the stress in the wall. The predicted mean stress in the AAA wall was insensitive to the permeability of the ILT and coincided with the results of AAA models using a single-phase ILT description. Conclusion At steady state, the biphasic ILT behaves like a single-phase material in an AAA model. Consequently, computational efficient FE single-phase models, as they have been exclusively used in the past, accurately predict the wall stress in AAA models.
Keywords
Pore pressure, Finite element analyses, Poroelasticity, Abdominal aortic aneurysm, Intraluminal Thrombus
Authors
POLZER, S.; GASSER, T.; MARKERT, B.; BURŠA, J.; SKÁCEL, P.
RIV year
2012
Released
18. 10. 2012
Publisher
Biomed Central
Location
London, GB
ISBN
1475-925X
Periodical
BIOMED ENG ONLINE
Year of study
11
Number
62
State
United Kingdom of Great Britain and Northern Ireland
Pages from
1
Pages to
13
Pages count
BibTex
@article{BUT94664, author="Stanislav {Polzer} and Thomas Christian {Gasser} and Bernd {Markert} and Jiří {Burša} and Pavel {Skácel}", title="Impact of poroelasticity of intraluminal thrombus on wall stress of abdominal aortic aneurysms", journal="BIOMED ENG ONLINE", year="2012", volume="11", number="62", pages="1--13", issn="1475-925X" }