A comparative study of spatial vectorcardiograms obtained with the equilateral tetrahedron and a corrected system of electrode placement.

Spatial vectorcardiograms of a group of normal young adults, recorded with two systems of electrode placement, have been studied. Those recorded with the equilateral tetrahedron as the reference system were similar to records previously described and had QRS-loops of two configurations. Those recorded with a method of lead placement designed to reduce the errors inherent in the commonly used reference frames had greater uniformity of form and orientation of both the QRS and T-loops.