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©2013 UpToDate ® Print Email AVNRT via Mahaim pathway The QRS complexes in this extremely rapid (approximately 450 beats/min) and regular tachycardia are widened or aberrant. The mechanisms for the arrhythmia include an atrioventricular nodal reentrant tachycardia with aberration or an antidromic atrioventricular reentrant tachycardia (AVRT) in a patient with the Wolff-Parkinson-White syndrome and antegrade conduction to the ventricle via a Kent pathway. At electrophysiologic testing, the etiology was determined to be an AVNRT with antegrade conduction to ventricle via an atriofascicular (Mahaim) accessory pathway. Courtesy of Morton Arnsdorf, MD.