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©2013 UpToDate ® Print Email 12 lead ECG of an uncommon form of an atrioventricular nodal reentrant tachycardia The 12 lead ECG shows a regular, narrow complex tachycardia at a rate of 130 beats per minute. The QRS complexes are normal. There is an abnormal "notching" within the ST segment, representing a retrograde P wave (*). The interval from the proceeding R wave (RP interval) is longer than the PR interval; this is a "long RP tachycardia", due to an atypical atrioventricular nodal reentrant tachycardia. 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.