Treatment Of The Additional Straight Linear Approach In Atrioventricular Nodal Dual Path-ways After Radiofrequency Ablation Of The Slow Pathway

Objective: To investigate the atrioventricular nodal reentrant tachycardia conventional method of residual slow pathway after ablation linear approach in the Koch's triangle changes in electrophysiological properties and clinical efficacy.Methods: 160 patients with AVNRT after successful ablation by conventional methods after the 49 patients with residual slow pathway were randomly allocated to the linear ablation group (n=25) and control group (n=24). Electrophysiology ablation were recorded before the two remaining slow pathway effective refractory period (ERP) and the maximum AH interval (A-Hmax), residual slow pathway ablation group blocking rate, such as failure to stop residual slow pathway Off the record, the average ERP of slow pathway, and A-Hmax changes as well as follow-up period without recurrence of tachycardia.Results: In control group mean slow pathway effective refractory period was 288.6±56.0ms, average maximum A-H interval was 306.9±52.0ms. Additional linear ablation group before ablation of slow pathway effective refractory period of the average 279±45.0ms, average maximum A-H interval was 312.9±66.8ms, the parameters of the two groups before surgery was no significant difference (P >0.05). Additional linear ablation group, 15 patients after ablation of slow pathway blocked, not blocked an average of 10 cases of slow pathway effective refractory period increased to 310.6±67.0ms, average maximum AH interval shortened to 280.9±52.0ms, with the control group Statistically significant difference compared (P <0.05). Intraoperative linear ablation group 1 patient had transientⅢ。AVB, stop the discharge back to normal. Follow-up year, the control group and the linear ablation group were 4 cases and 0 case of relapse, with a significant difference (P <0.05).Conclusion: Adopt linear approach in the Koch's triangle improved the treatment of dual atrioventricular node pathways AVNRT in a safe and effective method can be used as supplementary conventional surgical ablation.