On this ECG from a patient with wandering atrial pacemaker, the R–R intervals vary from beat to beat, creating an irregularly irregular rhythm. Note the.

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On this ECG from a patient with wandering atrial pacemaker, the R–R intervals vary from beat to beat, creating an irregularly irregular rhythm. Note the difference in shape and vector of the P waves (arrows) in rhythm strip lead II. Source: ARRHYTHMIAS, Atlas of Cardiovascular Emergencies Citation: Lefebvre C, O'Neill JC, Cline DM. Atlas of Cardiovascular Emergencies; 2015 Available at: https://accessemergencymedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1206/lefebvre_ch5_fig-05-07.png&sec=72943397&BookID=1206&ChapterSecID=72943351&imagename= Accessed: October 29, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved