Figure 2.

Correlation of the height of the R wave in lead V₁(R_v1) with hemodynamic data in 53 patients with pulmonary stenosis. The correlation coefficients (r) and the equation for the linear regression line representing the relationship between any two variables are given in each panel, each variable being represented by the first letters of its name, such as, RVWI for right ventricular work index. a. The correlation between R_v1 and the mean pressure gradient across the valve is rather poor (r = .63), and the children exhibit higher voltage complexes than adults with the same gradient. b, c, and d. Somewhat better correlations are obtained with the other hemodynamic variables, and here there appears to be no significant disparity between adults and children.