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contentuptodate· Content· item f5_61_6104

©2013 UpToDate ® Print Email Atrioventricular dissociation Independent activation of the atria and ventricles results in no fixed relationship between the P waves (arrows) and the QRS complexes; the PR intervals are variable in a random fashion. Normal rhythm strip Normal rhythm strip in lead II. The PR interval is 0.15 sec and the QRS duration is 0.08 sec. Both the P and T waves are upright. Courtesy of Morton F Arnsdorf, MD.