Abstract
A new method of electrocardiographic recording and analysis has been applied in a clinical study of left ventricular enlargement. The method consists of effective rotation of an orthogonal lead system to the position at which the leads match a predetermined pattern as closely as possible. The method furnishes approximate values for mean QRS and T axes, maximal magnitude of QRS and T vectors, polar vector magnitude and direction, and of the extent to which the direction of the heart vector deviates from a single direction and from a plane. Modifications of the method to include integration of the electrocardiogram will also furnish the ventricular gradient. Compensation for differences in heart orientation is intrinsic in the method. The parameters evaluated in this study provided various degrees of separation of the normal and abnormal records. The separation was improved by using indices composed of weighted sums of the individual parameters, with weighting factors determined by standard statistical procedures.
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