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Simultaneous endo–epicardial mapping in a patient’s RA during AF. Dotted line, epicardial activation; dashed line, endocardial activation. Depicted are six simultaneous electrograms, three on each exactly opposing side of the atrial wall. At points A, H, and I, almost synchronous activity was seen with slightly earlier activation at the endocardium, while at B and C, endo- and epicardial activation were out of phase.
