Abstract: Objective To summarize the clinical and electrophysiological characteristics of atrioventricular reentrant tachycardia in children, and to explore the efficacy and safety of radiofrequency catheter ablation in the treatment of atrioventricular reentrant tachycardia. Method The clinical data of children with atrioventricular reentrant tachycardia treated by radiofrequency catheter ablation from October 2014 to April 2020 were retrospectively analyzed. Results In 83 children ( 48 males and 35 females) with an average age of ( 9 . 48 ±2 . 88 ) years, there were 53 cases of left accessory pathway, in whom 51 cases had successful ablation and 3 cases had recurrence. There were 25 cases of right accessory pathway, in whom 25 cases had successful ablation and 6 cases had recurrence. There were 5 cases of double accessory pathway, in whom 5 cases had successful ablation and 1 case had recurrence. The immediate success rate, recurrence rate and complication rate of 83 cases were 97 . 6 %, 12 . 3 % and 6 . 0 % respectively. The average cumulative ablation time was ( 149 . 8 ± 42 . 2 ) s. The average cumulative ablation time was ( 140 . 2 ±36 . 3 ) s in the left-sided single atrioventricular accessory pathway group and ( 170. 0±47 . 3 ) s in the right-sided single atrioventricular accessory pathway group, and the difference between two groups was statistically significant (P=0.003). The recurrence rate in the right accessory pathway (24.0%) was higher than that in the left accessory pathway (5.7%), and the difference was statistically significant (χ2 = 3 . 95 , P= 0 . 047 ). Conclusion Radiofrequency catheter ablation is safe and effective in the treatment of atrioventricular reentrant tachycardia in children, but there is a certain probability of recurrence and the recurrence rate in the right accessory pathway is higher than that in the left accessory pathway.

Key words: atrioventricular reentrant tachycardia; radiofrequency catheter ablation; child