Split atrial electrograms recorded during dual chamber pacing.

Split atrial electrograms (AEGs), as a measure of intraatrial conduction delay, have been previously identified during electrophysiological studies and as such, may be related to the development of atrial tachyarrhythmias. This article reports the finding of split AEGs observed in two patients with implanted dual chamber pacemakers. The event marker and the surface electrogram identified these AEGs by using and interpreting the intracardiac AEG derived from the atrial pacing lead.