As. Hay et al., STROKE NORMALIZED PRESSURE - A USEFUL PARAMETER FOR THE ANALYSIS OF LEFT-VENTRICULAR OUTFLOW OBSTRUCTION, Medical engineering & physics, 18(8), 1996, pp. 609-614
A new method of presenting the in vivo left ventricular pressure-flow
data is developed in the present study. This separates left ventricle
ejection into unrestricted progressively restricted and severely restr
icted cases. This method uses ejection volume and time to define a nor
malizing 'stroke' pressure, which is successful in collapsing the larg
e variability of in vivo data to a few curves with characteristic shap
es, depending on the degree of obstruction. Hypertrophic cardiomyopath
y is shown to fall into both unrestricted and progressively restricted
categories. Normal hearts form the unrestricted case, while a severe
aortic valvular stenosis is characteristic of the severely restricted
case. Copyright (C) 1996 Elsevier Science for IPEMB.