The calculation of the intramyocardial stress

Abstract

A mathematical approach is given by which the intramyocardial stress σ induced in the passive medium of the myocardium is expressed as the sum of the stress ${(σ)}_{p}$ induced in the passive medium by the left ventricular pressure P and the external pressure $P_{o}$ , and the stress ${(σ)}_{d}$ induced in the passive medium by the active force generated by the muscular fibers of the myocardium. Relations between $σ = {(σ)}_{p} + {(σ)}_{d}$ , the left ventricular elastance E and the residual volume $V_{d}$ are also derived. Applications to experimental data are given and clinical implications of the results are discussed.

Keywords

muscular fiber stress in the myocardium end-systolic pressure-volume relation stress-strain analysis in the myocardium cardiac mechanics