Journal article
Does elevated wall tension cause aortic aneurysm rupture? Investigation using a subject-specific heterogeneous model
Journal of biomechanics, Vol.64, pp.164-171
11/07/2017
DOI: 10.1016/j.jbiomech.2017.09.041
PMID: 29102265
Abstract
To investigate whether peak wall tension in abdominal aortic aneurysm occurs at the site of rupture to test for a causative relationship.
Four ruptured and nine unruptured AAA were harvested whole from cadavers, followed by regional measurements of wall thickness, elastic parameters and failure tension. Finite element models were developed with subject-specific load-free AAA morphology and heterogeneous properties interpolated using a geodesic distance weighted approach from the measurements. The wall tension under uniform pressure and tension to failure tension ratio as an index of susceptibility to rupture were computed. As a secondary aim, the peak wall tension using this heterogeneous model approach was compared to the traditional homogeneous model approach in order to evaluate the reliability of the latter.
The average peak wall tension in the ruptured group was 43% higher than in the unruptured group without statistical significance even though it was 54% larger in diameter. The site of peak wall tension was in the vicinity of the site of rupture in two ruptured AAA. The peak tension did not breach failure tension at the rupture site in any of the AAA. The traditional population-wide homogeneous model approach overestimated peak wall tension by just 3% compared to the subject-specific heterogeneous model approach.
We failed to find adequate evidence of a causative relationship between peak wall tension and AAA rupture. The findings are not conclusive owing to study limitations such as ignoring intraluminal thrombus, sparse distribution of specimens procured and small study population.
Details
- Title: Subtitle
- Does elevated wall tension cause aortic aneurysm rupture? Investigation using a subject-specific heterogeneous model
- Creators
- Timothy K Chung - Department of Biomedical Engineering, University of Iowa, Iowa City, IA, USAErasmo S da Silva - Department of Vascular Surgery, University of São Paulo, São Paulo, BrazilSuresh M.L Raghavan - Department of Biomedical Engineering, University of Iowa, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Journal of biomechanics, Vol.64, pp.164-171
- DOI
- 10.1016/j.jbiomech.2017.09.041
- PMID
- 29102265
- NLM abbreviation
- J Biomech
- ISSN
- 0021-9290
- eISSN
- 1873-2380
- Publisher
- Elsevier Ltd
- Grant note
- name: American Heart Association Heartland Affiliate, award: #0365408Z
- Language
- English
- Date published
- 11/07/2017
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering
- Record Identifier
- 9984064256902771
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