Frank vectorcardiogram correlated with haemodynamic measurements: quantitative analysis.

Vectorcardiography is being used increasingly as a supplement to conventional electrocardiography. In particular, the scalar tracings may not help in the recognition of right ventricular hypertrophy, because the usually accepted criteria are diverse and unreliable (Sokolow and Lyon, 1949; Milnor, 1957; Wasserburger and Brown, 1958). We have chosen a measurable quantity, namely mean pulmonary artery pressure or right ventricular systolic pressure, for correlation with the vectorcardiogram. The Frank vectorcardiogram, a corrected orthogonal lead system, was employed for the study (Frank, 1956).