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©2013 UpToDate ® Print Email 12-lead electrocardiogram (ECG) of a right posteroseptal accessory AV pathway Electrocardiogram during rapid atrial pacing from a patient with Wolff-Parkinson-White syndrome. The QRS complex is maximally excited; the PR interval is short, and there is a left bundle branch morphology, left axis deviation, and early transition across the anterior precordial leads. The delta waves are positive in the lateral leads I, aVL, and V6 and negative in the inferior leads, localizing the pathway to the posteroseptal region. The negative delta wave in lead II places the pathway on the right, in the area between the coronary sinus os and middle cardiac vein.