precordial lead

[ lēd ]

n.

A lead of an electrocardiograph that has one electrode placed in any of six standard positions on the chest and another electrode placed on a limb.
A record obtained from such a lead.chest lead

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.