esophageal lead

[lēd]
n.
  1. A lead of an electrocardiograph that has an electrode inserted into the esophagus.
  2. A record that is obtained from such a lead.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.