Passive elastic wall stiffness of the left ventricle: A comparison between linear theory and large deformation theory |
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| Authors: | I Mirsky R F Janz B R Kubert B Korecky G C Taichman |
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| Institution: | (1) Department of Medicine, Harvard Medical School and Peter Bent Brigham Hospital, Boston, Massachusetts;(2) Data Systems Analysis Section, The Aerospace Corporation, Los Angeles, California, U.S.A.;(3) Department of Physiology, The Faculty of Medicine of the University of Ottawa, Canada |
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| Abstract: | Assuming a spherical geometry for the left ventricle, passive elastic stiffness-stress relations have been obtained on the
basis of linear elasticity theory and large deformation theory. Employing pressure-volume aata taken from rat hearts of various
age groups, it is shown that young rat heart muscle (1 month) is stiffer than either adult (7 months) or old rat heart muscle
(17 months). Although the qualitative results are similar for both elasticity theories, the large deformation theory gave
results in closer agreement with those obtained from papillary muscle studies. These results imply that stiffness of muscleper se can be assessed from left ventricular pressure-volume data. |
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