Computational Modeling of Ventricular Mechanics and Energetics

[+] Author and Article Information
Nicolas Smith, Carey Stevens, Peter Hunter

Bioengineering Institute, University of Auckland, Auckland, New Zealand

Appl. Mech. Rev 58(2), 77-90 (Apr 06, 2005) (14 pages) doi:10.1115/1.1859794 History: Online April 06, 2005
Copyright © 2005 by ASME
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Anatomically accurate canine and porcine finite element models. Two layers of streamlines (one on the outer epicardial surface and one midway through the wall) are used to visualize the epicardial and midwall fiber directions which continuously rotate through the wall.
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(a) Tension recovery (lower figure) following a length step of Δλ of duration Δt (upper figure). Notice the different phases of the tension recovery. (b) Tension T1 reached at the end of the length step, divided by isometric tension T0, plotted against the magnitude of the length step Δλ. One curve is for a length step of 1 ms duration and the other for an idealized instantaneous step.
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Coordinate systems used in the kinematic analysis of large deformation mechanics
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Regional work rate calculated at Gauss points shown in Fig. 1. The end of diastolic filling and isovolumic contraction are marked using vertical lines on each figure.
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Red squares indicate base and apex Gauss point positions in the septum and left and right ventricular free wall where work rate is calculated
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View of the heart mode where the total work performed by myocyte contraction through the heart cycle is shown at Gauss points in the myocardium (results are scales such that blue corresponds to 0 mJ/g and red corresponds to 50 mJ/g)
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Results of coupled cardiac mechanics and coronary blood flow model
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Epicardial blood flow velocity profiles
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Relationship between regional work and coronary perfusion calculated at each Gauss point in the myocardium




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