Vessel asymmetry as an additional diagnostic tool in the assessment of abdominal aortic aneurysms.

Hdl Handle:
http://hdl.handle.net/10147/87113
Title:
Vessel asymmetry as an additional diagnostic tool in the assessment of abdominal aortic aneurysms.
Authors:
Doyle, Barry J; Callanan, Anthony; Burke, Paul E; Grace, Pierce A; Walsh, Michael T; Vorp, David A; McGloughlin, Timothy M
Affiliation:
Department of Mechanical and Aeronautical Engineering, Centre for Applied Biomedical Engineering Research, Materials and Surface Science Institute, University of Limerick, Limerick, Ireland.
Citation:
Vessel asymmetry as an additional diagnostic tool in the assessment of abdominal aortic aneurysms. 2009, 49 (2):443-54 J. Vasc. Surg.
Journal:
Journal of vascular surgery : official publication, the Society for Vascular Surgery [and] International Society for Cardiovascular Surgery, North American Chapter
Issue Date:
Feb-2009
URI:
http://hdl.handle.net/10147/87113
DOI:
10.1016/j.jvs.2008.08.064
PubMed ID:
19028061
Additional Links:
http://www.sciencedirect.com
Abstract:
OBJECTIVE: Abdominal aortic aneurysm (AAA) rupture is believed to occur when the local mechanical stress exceeds the local mechanical strength of the wall tissue. On the basis of this hypothesis, the knowledge of the stress acting on the wall of an unruptured aneurysm could be useful in determining the risk of rupture. The role of asymmetry has previously been identified in idealized AAA models and is now studied using realistic AAAs in the current work. METHODS: Fifteen patient-specific AAAs were studied to estimate the relationship between wall stress and geometrical parameters. Three-dimensional AAA models were reconstructed from computed tomography scan data. The stress distribution on the AAA wall was evaluated by the finite element method, and peak wall stress was compared with both diameter and centerline asymmetry. A simple method of determining asymmetry was adapted and developed. Statistical analyses were performed to determine potential significance of results. RESULTS: Mean von Mises peak wall stress +/- standard deviation was 0.4505 +/- 0.14 MPa (range, 0.3157-0.9048 MPa). Posterior wall stress increases with anterior centerline asymmetry. Peak stress increased by 48% and posterior wall stress by 38% when asymmetry was introduced into a realistic AAA model. CONCLUSION: The relationship between posterior wall stress and AAA asymmetry showed that excessive bulging of one surface results in elevated wall stress on the opposite surface. Assessing the degree of bulging and asymmetry that is experienced in an individual AAA may be of benefit to surgeons in the decision-making process and may provide a useful adjunct to diameter as a surgical intervention guide.
Item Type:
Article
Language:
en
ISSN:
1097-6809

Full metadata record

DC FieldValue Language
dc.contributor.authorDoyle, Barry Jen
dc.contributor.authorCallanan, Anthonyen
dc.contributor.authorBurke, Paul Een
dc.contributor.authorGrace, Pierce Aen
dc.contributor.authorWalsh, Michael Ten
dc.contributor.authorVorp, David Aen
dc.contributor.authorMcGloughlin, Timothy Men
dc.date.accessioned2009-11-30T16:10:40Z-
dc.date.available2009-11-30T16:10:40Z-
dc.date.issued2009-02-
dc.identifier.citationVessel asymmetry as an additional diagnostic tool in the assessment of abdominal aortic aneurysms. 2009, 49 (2):443-54 J. Vasc. Surg.en
dc.identifier.issn1097-6809-
dc.identifier.pmid19028061-
dc.identifier.doi10.1016/j.jvs.2008.08.064-
dc.identifier.urihttp://hdl.handle.net/10147/87113-
dc.description.abstractOBJECTIVE: Abdominal aortic aneurysm (AAA) rupture is believed to occur when the local mechanical stress exceeds the local mechanical strength of the wall tissue. On the basis of this hypothesis, the knowledge of the stress acting on the wall of an unruptured aneurysm could be useful in determining the risk of rupture. The role of asymmetry has previously been identified in idealized AAA models and is now studied using realistic AAAs in the current work. METHODS: Fifteen patient-specific AAAs were studied to estimate the relationship between wall stress and geometrical parameters. Three-dimensional AAA models were reconstructed from computed tomography scan data. The stress distribution on the AAA wall was evaluated by the finite element method, and peak wall stress was compared with both diameter and centerline asymmetry. A simple method of determining asymmetry was adapted and developed. Statistical analyses were performed to determine potential significance of results. RESULTS: Mean von Mises peak wall stress +/- standard deviation was 0.4505 +/- 0.14 MPa (range, 0.3157-0.9048 MPa). Posterior wall stress increases with anterior centerline asymmetry. Peak stress increased by 48% and posterior wall stress by 38% when asymmetry was introduced into a realistic AAA model. CONCLUSION: The relationship between posterior wall stress and AAA asymmetry showed that excessive bulging of one surface results in elevated wall stress on the opposite surface. Assessing the degree of bulging and asymmetry that is experienced in an individual AAA may be of benefit to surgeons in the decision-making process and may provide a useful adjunct to diameter as a surgical intervention guide.-
dc.language.isoenen
dc.relation.urlhttp://www.sciencedirect.comen
dc.titleVessel asymmetry as an additional diagnostic tool in the assessment of abdominal aortic aneurysms.en
dc.typeArticleen
dc.contributor.departmentDepartment of Mechanical and Aeronautical Engineering, Centre for Applied Biomedical Engineering Research, Materials and Surface Science Institute, University of Limerick, Limerick, Ireland.en
dc.identifier.journalJournal of vascular surgery : official publication, the Society for Vascular Surgery [and] International Society for Cardiovascular Surgery, North American Chapteren

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