Abstract
Background: Reduction of the fast pathway effective period has been reported in adult patients with successful slow pathway disconnection. However in children, the effect of slow pathway ablation on fast pathway refractoriness has not been well documented.
Method: Medical charts of children without congenital heart diseases who received radiofrequency catheter ablation for the treatment of atrioventricular nodal reentrant tachycardia （AVNRT） during April 2011 and August 2013 were retrospectively reviewed. Fast pathway effective refractory periods before and after slow pathway ablation were compared.
Result: Eight children were included in the study. Slow pathways were successfully disconnected in all children without any complications, and none of them showed any evidence of recurrence during the follow-up period. Fast pathway effective refractory period was significantly shortened after slow pathway disconnection （403.8 ± 101.6 ms vs. 300.0 ± 96.2 ms，p <0.001）.
Conclusions: Effective refractory period of fast pathway was reduced significantly after slow pathway disconnection in children with AVNRT.
