Document Detail

Effects of wall calcifications in patient-specific wall stress analyses of abdominal aortic aneurysms.
MedLine Citation:
PMID:  17227104     Owner:  NLM     Status:  MEDLINE    
It is generally acknowledged that rupture of an abdominal aortic aneurysm (AAA) occurs when the stress acting on the wall over the cardiac cycle exceeds the strength of the wall. Peak wall stress computations appear to give a more accurate rupture risk assessment than AAA diameter, which is currently used for a diagnosis. Despite the numerous studies utilizing patient-specific wall stress modeling of AAAs, none investigated the effect of wall calcifications on wall stress. The objective of this study was to evaluate the influence of calcifications on patient-specific finite element stress computations. In addition, we assessed whether the effect of calcifications could be predicted directly from the CT-scans by relating the effect to the amount of calcification present in the AAA wall. For 6 AAAs, the location and extent of calcification was identified from CT-scans. A finite element model was created for each AAA and the areas of calcification were defined node-wise in the mesh of the model. Comparisons are made between maximum principal stress distributions, computed without calcifications and with calcifications with varying material properties. Peak stresses are determined from the stress results and related to a calcification index (CI), a quantification of the amount of calcification in the AAA wall. At calcification sites, local stresses increased, leading to a peak stress increase of 22% in the most severe case. Our results displayed a weak correlation between the CI and the increase in peak stress. Additionally, the results showed a marked influence of the calcification elastic modulus on computed stresses. Inclusion of calcifications in finite element analysis of AAAs resulted in a marked alteration of the stress distributions and should therefore be included in rupture risk assessment. The results also suggest that the location and shape of the calcified regions--not only the relative amount--are considerations that influence the effect on AAA wall stress. The dependency of the effect of the wall stress on the calcification elastic modulus points out the importance of determination of the material properties of calcified AAA wall.
Lambert Speelman; Ajay Bohra; E Marielle H Bosboom; Geert Willem H Schurink; Frans N van de Vosse; Michel S Makaorun; David A Vorp
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Journal of biomechanical engineering     Volume:  129     ISSN:  0148-0731     ISO Abbreviation:  J Biomech Eng     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-17     Completed Date:  2007-07-11     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  7909584     Medline TA:  J Biomech Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  105-9     Citation Subset:  IM    
Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.
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MeSH Terms
Aorta, Abdominal / physiopathology*
Aortic Aneurysm, Abdominal / complications,  physiopathology*
Calcinosis / complications,  physiopathology*
Computer Simulation
Models, Cardiovascular*
Shear Strength
Stress, Mechanical
Grant Support

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