The treatment results of radiofrequency ablation (m) were analyzed in l5 patients with the complicated Supraventricular tachycardia(SVT)． The causes of SVT were dual accessory pathway(AP) in 9 patients, single M with slow-fast atrioventricular junctional reentrant tachycardio (AVJRT) in 5 patients and single AP with slow fast/fast-slow AVJRT in l patient． Results: 24 APs and 6 slow pathways of atrioventricular node were abl a ted． All patients were successful． During the follow-up of 6～48 months, there were no recurrence in l5 patients, also there were no occurrence of atrioventricular block and other complications． Conclusion: Using the proper methods of m of the complicated SVT would have a h igher successful rate, a lower recurrent rate and lower complications．
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