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©2013 UpToDate ® Print Email 12 lead ECG of the common form of an atrioventricular nodal reentrant tachycardia The 12 lead ECG shows a regular narrow complex tachycardia with a rate of 135 beats per minute; no P waves can be seen. The QRS morphology is identical to that seen during sinus rhythm. Courtesy of Martin Burke, DO. 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.