A Contribution to the Method of Analysis in the Vectorcardiography

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Abstract
The angular range is the range of the direction, in which instantaneous vectors exist. The magnitude of the polar vector is 1/2 of the integral of this angle weighed by square of the instantaneous vector, if the loop is on 1 plane. The angular range was used for quantitative estimation of the inscription of the vector loop. The angular range of major vectors was evaluated by means of half maximal vectors. The obtained value of the angular range might also be used for estimation of the loop area. Frank lead vectorcardiograms of 50 normal subjects and 76 patients with ventricular hypertrophy were examined with the above method in 3 planar projections. The half maximal vector itself examined with the QRS loop was of some clinical value.

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