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(Circulation. 1950;2:111.)
© 1950 American Heart Association, Inc.

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Standardizing Factors in Electrocardiography

JAMES A. CRONVICH M.S.¹; JOHN P. CONWAY M.D.¹; GEORGE E. BURCH M.D.¹

¹ From the School of Electrical Engineering and Department of Medicine, Tulane University School of Medicine and Charity Hospital of Louisiana at New Orleans.

Modifications in recorder standardization are required to correct inherent scalar differences among potential differences measured in a given electrocardiographic reference frame. In the frontal plane, agreement between the resultant vectors calculated from unipolar limb lead measurements and from standard lead measurements can be obtained by standardizing the galvanometer for recording the unipolar limb lead potentials at 3 cm. per millivolt. A method for calculating this "standardizing factor" and similar factors for other reference frames is presented and applied to calculations for the equilateral tetrahedron, the isosceles tetrahedron, and the cube.

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