Dynamical Relations for Left Ventricular Ejection: Flow Rate, Momentum, Force and Impulse

[+] Author and Article Information
L. H. Back, D. C. Ledbetter, R. H. Selzer

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, Calif. 91109

D. G. Gordon

Southern Cardiology, P.A., Birmingham, Ala. 35209

D. W. Crawford

Department of Medicine, Cardiology Division, University of Southern California School of Medicine, Los Angeles, Calif. 90033

J Biomech Eng 106(1), 54-61 (Feb 01, 1984) (8 pages) doi:10.1115/1.3138457 History: Received November 29, 1982; Revised August 29, 1983; Online June 15, 2009


An investigation was carried out to quantitatively evaluate left ventricular volume flow rate, momentum, force and impulse derived from application of conservation principles for mass and momentum of blood within the ventricle during the ejection phase. An automated digital image processing system was developed and applied to left ventricular angiograms which are computer processed and analyzed frame by frame to determine the dynamical relations by numerical methods. Our initial experience with force and impulse has indicated that neither quantity seemed to be a sensitive indicator of coronary artery disease as evaluated by qualitative angiography for the particular patient group studied. Utilization of the dynamical relations in evaluating human left ventricular performance requires improved means of measurement and interpretation of clinical studies.

Copyright © 1984 by ASME
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