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contentuptodate· Content· item f38_4_38986

©2013 UpToDate ® Print Email Advanced case 15 Normal ECG Normal electrocardiogram showing normal sinus rhythm at a rate of 75 beats/min, a PR interval of 0.14 sec, a QRS interval of 0.10 sec, and a QRS axis of approximately 75°. Courtesy of Ary Goldberger, MD.