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April 24, 1943

SECOND SUPPLEMENTARY REPORT BY THE COMMITTEE OF THE AMERICAN HEART ASSOCIATION FOR THE STANDARDIZATION OF PRECORDIAL LEADS2

Author Affiliations

Rochester, Minn.; New York; Boston; Ann Arbor, Mich.; Philadelphia.

JAMA. 1943;121(17):1349-1351. doi:10.1001/jama.1943.62840170008009a
Abstract

Early in 1938 the Committee of the American Heart Association for the Standardization of Precordial Leads and a similar committee representing the Cardiac Society of Great Britain and Ireland made joint recommendations with reference to a single precordial lead for routine use. In a supplementary report published in the same year, the American committee recommended that when multiple precordial leads were taken the precordial electrode be paired either with an electrode on the left leg or with a central terminal connected through equal resistances of 5,000 or more ohms to three electrodes, one on the right arm, one on the left arm and one on the left leg. Six precordial points were recommended as suitable locations for the precordial electrodes, and these may be referred to as the C1, C2, C3, C4, C5 and C6 positions. In the last few years the number of

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