A three-dimensional finite element method for large elastic deformations of ventricular myocardium: II--Prolate spheroidal coordinates.

Costa, K D; Hunter, P J; Wayne, J S; Waldman, L K; Guccione, J M; McCulloch, A D

Costa, K D; Hunter, P J; Wayne, J S; Waldman, L K; Guccione, J M; McCulloch, A D.

Afiliación

Costa KD; Department of Bioengineering, University of California San Diego, La Jolla, CA, USA.

J Biomech Eng ; 118(4): 464-72, 1996 Nov.

Article en En | MEDLINE | ID: mdl-8950649

RESUMEN

A three-dimensional finite element method for nonlinear finite elasticity is presented using prolate spheroidal coordinates. For a thick-walled ellipsoidal model of passive anisotropic left ventricle, a high-order (cubic Hermite) mesh with 3 elements gave accurate continuous stresses and strains, with a 69 percent savings in degrees of freedom (dof) versus a 70-element standard low-order model. A custom mixed-order model offered 55 percent savings in dof and 39 percent savings in solution time compared with the low-order model. A nonsymmetric 3D model of the passive canine LV was solved using 16 high-order elements. Continuous nonhomogeneous stresses and strains were obtained within 1 hour on a laboratory workstation, with an estimated solution time of less than 4 hours to model end-systole. This method represents the first practical opportunity to solve large-scale anatomically detailed models for cardiac stress analysis.

Asunto(s)

Modelos Cardiovasculares; Función Ventricular/fisiología; Animales; Simulación por Computador; Perros; Elasticidad; Miocardio/metabolismo; Estrés Mecánico

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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Función Ventricular / Modelos Cardiovasculares Límite: Animals Idioma: En Revista: J Biomech Eng Año: 1996 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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