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(Circulation. 1959;20:229.)
© 1959 American Heart Association, Inc.

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Formation of the "P-R Segment"

CESAR A. CACERES M.D.¹; GEORGE A. KELSER JR. M.D.¹; W. RAYMOND MIZE M.D.¹

¹ From the Department of Medicine, George Washington University Hospital, Washington, D.C.

Variance of opinion among authors regarding the cause and duration of each succeeding portion of the P-R interval points out that knowledge regarding the physiologic basis for these waves is incomplete. Data regarding the P-R segment are scant in electrocardiographic literature. The necessity for precision in measurement and the need for better visualization of electrocardiographic waves to enhance their diagnostic value are illustrated by study of the generally ignored region between the P and QRS.