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©2013 UpToDate ® Print Email 12 lead ECG of atrial fibrillation The 12 lead ECG shows atrial fibrillation. The QRS complex is narrow, P waves are absent, and the baseline between successive QRS complexes shows irregular coarse "fibrillatory waves." The QRS complexes occur at irregularly irregular intervals. Reproduced with permission by Samuel Levy, MD. 12 lead ECG of atrial flutter The 12 lead ECG of atrial flutter shows a regular rhythm with a narrow QRS complex. Flutter waves are present, best seen in leads 2, 3, and aVF (*). One flutter wave is obvious between the QRS complexes, while the second one is superimposed on the terminal portion of the QRS complex; hence there is 2:1 atrioventricular nodal block, which is the most common presentation for atrial flutter. Reproduced with permission by Samuel Levy, MD.
©2013 UpToDate ® Print Email 12 lead ECG of atrial fibrillation The 12 lead ECG shows atrial fibrillation. The QRS complex is narrow, P waves are absent, and the baseline between successive QRS complexes shows irregular coarse "fibrillatory waves." The QRS complexes occur at irregularly irregular intervals. Reproduced with permission by Samuel Levy, MD.