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contentuptodate· Content· item f2_14_2272
©2013 UpToDate ® Print Email Sinus bradycardia Marked sinus bradycardia at a rate of 25 to 30 beats/min. The normal P waves (upright in lead II) and PR interval and consistent with a sinus mechanism with normal atrioventricular (AV) conduction. Courtesy of Ary Goldberger, MD.