Patients with the Wolff-Parkinson-White (WPW) syndrome have preexcited
tachycardia as the result of atrial arrhythmias or antidromic reentry
. This article describes a patient with persistent wide complex tachyc
ardia due to abnormal automaticity in the accessory pathway. Radiofreq
uency catheter ablation resulted in simultaneous elimination of access
ory pathway conduction and automaticity Accessory pathway automaticity
may be an infrequent cause of preexcited tachycardia in patients with
the WPW syndrome.