Geometry left ventricle

The parameters that describe the normal blood flow through the aortic valve are the velocity profile, time course of the blood velocity or flow, and magnitude of the peak velocity. These are determined in part by the pressure difference between the ventricle and aorta and by the geometry of the aortic valve complex. As seen in Figure 55.3, the velocity profile at the level of the aortic valve annulus is relatively flat. However there is usually a slight skew toward the septal wall (less than 10% of the center-line velocity) which is caused by the orientation of the aortic valve relative to the long axis of the left ventricle. This skew... 

MDCT provides detailed three-dimensional information on the geometry of the left ventricle, including the exact location and dimension of the aneurysm. Three-dimensional models of the heart based on MDCT data sets may help the surgeon to assess the ideal resection lines and to determine the residual ventricular size and shape after a reconstructive procedure (Jacobs et al.2008). 

Figure 10. Undeformed shape of the free wall of a normal rat left ventricle. The network superimposed on the wall geometry illustrates the finite-element substructure in the mathematical model. (Reproduced from Janz and Waldron Predicted effect of chronic apical aneurysms on the passive stiffness of the human left ventricle, Circ Res 42 255,1978 with permission from the American Heart Association.)...

Horowitz A, Perl M, Sideman S (1984) Geodesics as a mechanically optimal fiber geometry for the left ventricle. Technion - Israel Institute of Technology, Haifa, Israel, submitted for publication. 

Figure 6. Method of estimation of the elastic modulus of the myocardium using echocardiographic and hemodynamic data. An assumed elastic modulus, the early diastolic geometry of the left ventricle obtained from the echocardiographic reconstruction, and the measured pressure change in the left ventricle during diastole are used to predict the late diastolic geometry of the ventricle. This predicted geometry is compared to the actual, reconstructed late diastolic geometry and this process is repeated until the difference between predicted and actual late diastolic geometries is minimized.

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