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The technic of endocardial electrocardiography has been useful in applying certain basic concepts to the interpretation of an electrocardiogram. One of the earliest intra-auricular records, obtained in 1944, is here analyzed in detail. It led to a reaffirmation of the dipole concept of cardiac excitation. A number of selected auricular electrocardiograms recorded by simultaneous tracings from the chestwall and the esophagus demonstrate the direct clinical usefulness of the theoretic postulates.

Excitation of Human Auricular Muscle and the Significance of the Intrinsicoid Deflection of the Auricular Electrocardiogram