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The existence of a component of the epicardial electrocardiogram that can be properly called the intrinsic deflection, to use Lewis's term (Lewis and Rothschild, 1915), is a matter of both im- portance and dispute. Whether or not intrinsicoid deflections The significance of correlation between the ECG and the VCG has been pointed out by Duchosal and Sulzer (1949). The introduction of more advanced vectorcardiographic lead systems has improved such correlation (Sano et al., 1959) and certain cancellation experiments have indicated that on theoretical grounds, with accurate image space data for the individual examined, almost perfect correlation might be achieved This view has not, however, been universally accepted; for example, Whether all significant electrocardiographic data provided by the standard 12-lead electrocardiogram were present in the X, Y, Z-orthocardiograms obtained from the SVEC III lead system
Gordon E. Dower (Mon,) studied this question.