Sivertssen, Egil
January 1973
Angiology;Jan1973, Vol. 24 Issue 1, p3
Academic Journal
The atrial complex has been analyzed in unipolar right atrial electrocardiograms from 178 individuals with sinus rhythm and compared with the atrial complex in standard leads. Standardization of the right atrial registration was attempted by registration from the sinus node region. This position was achieved by withdrawing the electrode in proximal direction from a lower position until the initial positive deflection of the atrial complex disappeared. The method was found to give acceptable reproducibility. The intracavitary atrial complex (RA-P wave) was compared with the atrial complex in standard leads. In normal individuals with a rounded P wave in the extremity leads, the nadir of the RA-P wave usually corresponded to the beginning of the plateau. In individuals with an angular form in the extremity leads, the top of the P wave corresponded in time to the ascending limb of the RA-P wave. When a notched P wave was found in the extremity leads, the first notch corresponded to the nadir of the RA-P wave and the second to a notch on the ascending limb. Although a statistically significant association was found between the duration and amplitude of the atrial complex in right atrial and standard leads, the association was of low grade. The right atrial electrocardiogram may therefore give additional information to the standard leads.


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