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(Circulation. 1954;9:267.)
© 1954 American Heart Association, Inc.

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A Study of the Spatial Vectorcardiogram of the Ventricular Gradient

G. E. BURCH M.D.¹; J. A. ABILDSKOV M.D.¹; J. A. CRONVICH M.S.¹

¹ From the Department of Medicine, Tulane University School of Medicine, Charity Hospital of Louisiana at New Orleans, and the Department of Electrical Engineering, Tulane University of Louisiana, New Orleans, La.

A concept of the ventricular gradient as a quantity which varies with time during the cardiac cycle is presented. Some methods for deriving values of the "mean instantaneous ventricular gradient" and from these the "vector-cardiogram of the gradient" are outlined. Despite obvious shortcomings in these technics, some results of the application of these methods are reported.