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(Circulation. 1957;16:582.)
© 1957 American Heart Association, Inc.

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The Normal QRS Loop Observed Three Dimensionally Obtained with the Frank Precordial System

GEORGE E. SEIDEN M.D.¹

¹ From the Edward B. Robinette Foundation, and the Medical and Diagnostic Clinics, Hospital of the University of Pennsylvania.

By means of a relatively orthogonal lead system combined with the use of an electronic resolver, 3-dimensional QRS loops of normal individuals have been seen broadside in 2 dimensions after proper rotation. QRS loops so visualized have been studied by certain quantitative measurements which it is hoped may be of assistance in distinguishing normal from abnormal loops.

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