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The vectorcardiographic findings in 27 patients with right ventricular systolic (pressure) overloading are presented, in comparison with 50 normal subjects. In this study, a method of planimetric measurements of QRS loop area is adopted as a quantitative analysis of vectorcardiograms. In this series of patients with right ventricular overloading, (R.V.O.), the rightward forces, represented by the QRS loop area in the II and III quadrant of the horizontal plane, increased, whereas the leftward forces, represented by the QRS loop area in the I quadrant of the horizontal plane, decreased. The characteristic fingings of R.V.O. are presented in this series of patients.

A VECTORCARDIOGRAPHIC STUDY OF RIGHT VENTRICULAR SYSTOLIC OVERLOADING WITH THE FRANK SYSTEM