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©2013 UpToDate ® Print Email Preexcited tachycardia during atrial fibrillation The ventricular rate in this irregularly irregular arrhythmia is extremely rapid, approaching 500 beats/min. The QRS complexes are wide or aberrant and have variable morphologies, suggesting that there are multiple accessory atrioventricular connections. At electrophysiologic study left posterior and left lateral pathways were identified and successfully ablated. Courtesy of Morton Arnsdorf, MD. Normal ECG Normal sinus rhythm at a rate of 71 beats/min, a P wave axis of 45°, and a PR interval of 0.15 sec. Courtesy of Morton Arnsdorf, MD.