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Abstract
A comparative analysis of cube and tetrahedral vectorcardiograms from 50 individuals consisting of 13 normals and 37 pathological cases is presented. The comparison between vector loops has been performed with a Subjective method of evaluation and with measurement of the angular deviation of corresponding vectors. Further, the extent to which normal respiration affects the orientation of the QRS vector in successive beats has been investigated. It is considered that:
1. There was unsatisfactory correspondence of vectorcardiograms recorded with the cube and tetrahedral lead systems.
2. There was a tendency to anterior, rightward and inferior displacement of the tetrahedral loops when compared with the cube vectorcardiograms.
3. The observed discrepancy calls for standardisation of lead systems for vectorcardiography and the adoption of modern electrically orthogonal lead systems.
4. Changes of the QRS vectors in successive heats under normal respiration seem to have no importance for practical clinical purposes in the determination of the spatial orientation of vectors from separately recorded planar projections.