A cylindrical model of the left ventricle demonstrated that ejection fraction is determined by both the extent of myocardial shortening and the relationship of wall thickness to cavity size.
A cylindrical model of the left ventricle demonstrates that ejection fraction depends on both myocardial shortening and the ratio of wall thickness to cavity size, which can be used to assess ejection fraction more precisely from M-mode echocardiograms.
We used a cylindrical model for the left ventricle contracting both radially and longitudinally to show how the ejection fraction is related to different variables that describe the ventricular geometry. The relations during ventricular contraction between wall thickening, midwall radius shortening and longitudinal shortening are used to derive precise formulas for the calculation of ventricular blood flow velocity and ejection fraction. Validation of the model is given by results from the literature and by a study of 40 patients. The formulas derived can be used to validate angiographic measurements or to assess more precisely blood flow velocity and ejection fraction from the M-mode echocardiogram. Ejection fraction is determined not only by the extent of myocardial shortening, but also by the relationship of ventricular wall thickness to ventricular cavity size.
Dumesnil et al. (Fri,) conducted a other in Left ventricular geometry and ejection fraction assessment (n=40). Cylindrical model for the left ventricle was evaluated on Calculation of ventricular blood flow velocity and ejection fraction. A cylindrical model of the left ventricle demonstrated that ejection fraction is determined by both the extent of myocardial shortening and the relationship of wall thickness to cavity size.