Electrophysiological Characteristic and Ablation of"Atypical Jump"Atrioventricular Nodal Reentrant Tachycardia

Objective:To study the electrophysiological characteristic of atypical jump atrioventricular nodal reentrant tachycardia and evaluate the endpoint of radiofrequency ablation.Methods:The Wenckebach period and refractory period were compared before and after slow pathway ablation.Results:The Wenckebach period and refractory period of atrioventricular nodal were significantly lengthened after ablation[(295±34)ms vs(330±48)ms,(258±24)ms vs(294±32)ms,respectively,P0.01].Conclusion:Fast pathway block in basic condition and similarity of the refractory period between fast and slow pathway were the possible mechanism of continuous atrioventricular nodal function curve.Tachycardia cannot be induced after isoproterenol administra-tion,the change of refractory period was the end point of ablation,and the latter was more important.