1 From the Cardiovascular Laboratory, Department of Medicine, University of Tennessee, and the John Gaston Hospital, Memphis, Tenn.
Cancellation of juxtacardiac esophageal electrocardiograms, as demonstrated in this study, indicates certain limitations of the equivalent cardiac dipole hypothesis. A new and more fundamental theory developed here shows that in large measure cancellation occurs because the cancellation network is in effect a relatively insensitive electrocardiographic connection, and because there is always prior assurance that a given complex can be completely canceled at any 2 desired instants during the cycle. The new theory also explains the paradox that proximity electrocardiograms can be canceled even though local action currents exert a relatively powerful influence on such leads.
© 1957 American Heart Association, Inc.
Cancellation of Esophageal Electrocardiograms