AJP - Heart and Circulatory Physiology, Vol 242, Issue 5 875-H881, Copyright © 1982 by American Physiological Society
Estimation of local myocardial stress
R. F. Janz
Two formulas are presented for estimating local average circumferential
stress in the left ventricle from the cavity pressure and various
quantities, available from the angiogram, which characterize the size and
shape of the cavity and ventricular wall. The advantages of these formulas
are as follows: 1) they are based on thick-wall shell theory; 2) they are
intended for application at positions in the ventricular wall other than
the base; and 3) they are based on a more general representation of
ventricular geometry than a sphere, cylinder, or ellipsoid. Except for one
location, both formulas predict average circumferential stresses that agree
to within 25% with the corresponding stresses in a finite element model of
an aneurysmal ventricle. In addition, at the equator of a thick-wall
ellipsoid, the formulas are identical in form to a previously derived
formula that has been shown to predict stresses that are in fair to good
agreement with measured stresses in the open-chest dog heart.
