WOLFF-PARKINSON-WHITE SYNDROME PRESENTING AS THE PERMANENT FORM OF JUNCTIONAL RECIPROCATING TACHYCARDIA

The substrate of the permanent form of junctional reciprocating tachyc ardia is an accessory pathway with no spontaneous anterograde conducti on, usually located in the posteroseptal area, We report a case of thi s type of tachycardia with overt anterograde ventricular preexcitation . Electrophysiologic study confirmed that tachycardia was due to an ac cessory pathway with long retrograde conduction time; electrophysiolog ic findings suggested longitudinal dissociation of the accessory pathw ay, Radiofrequency application at the coronary sinus os resulted in di sappearance of preexcitation and cure of the tachycardia.