Document Detail

Assessment of the influence of the compliant aortic root on aortic valve mechanics by means of a geometrical model.
MedLine Citation:
PMID:  9450254     Owner:  NLM     Status:  MEDLINE    
In recent years several researchers have suggested that the changes in the geometry and angular dimensions of the aortic root which occur during the cardiac cycle are functional to the optimisation of aortic valve function, both in terms of diminishing leaflet stresses and of fluid-dynamic behaviour. The paper presents an analytical parametric model of the aortic valve which includes the aortic root movement. The indexes used to evaluate the valve behaviour are the circumferential membrane stress and the stress at the free edge of the leaflet, the index of bending strain, the bending of the leaflet at the line attachment in the radial and circumferential directions and the shape of the conduit formed by the leaflets during systole. In order to evaluate the role of geometric changes in valve performance, two control cases were considered, with different reference geometric configuration, where the movement of the aortic root was ignored. The results obtained appear consistent with physiological data, especially with regard to the late diastolic phase and the early ejection phase, and put in evidence the role of the aortic root movement in the improvement of valve behaviour.
A Redaelli; E Di Martino; A Gamba; A M Procopio; R Fumero
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medical engineering & physics     Volume:  19     ISSN:  1350-4533     ISO Abbreviation:  Med Eng Phys     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-03-12     Completed Date:  1998-03-12     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9422753     Medline TA:  Med Eng Phys     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  696-710     Citation Subset:  IM    
Department of Bioengineering, Politecnico di Milano, Italy.
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MeSH Terms
Aorta / physiology*
Aortic Valve / physiology*
Models, Cardiovascular
Myocardial Contraction
Stress, Mechanical
Ventricular Pressure

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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