目的　探讨心室反应 (VR)在射频消融IVT的作用。方法　应用体表心电图、心内膜激动标测及VR相结合的方法射频消融 13例IVT病人。以激动标测初选靶点 ,射频消融试放电产生的VR确定靶点 ,采用VR与VT发作相一致处为靶点消融。结果　 13例IVT即刻消融成功率 13/ 13。VR表现 :(1)窦性心律下消融时出现与VT发作相一致的VR。随后室性心动过速 (VT)中间断出现窦性心律、双发或联律室性早搏 ,最终完全恢复成窦性心律。 (2 )出现与VT发作不一致的VR。结论　以VR与VT发作相一致处作靶点 ,产生与VT发作相一致的VR可被视为有效消融的指标。 Objective To investigate the role of ventricular response (VR) in radiofrequency ablation of IVT. Methods The method of surface electrocardiogram, endocardial stimulation mapping and VR combined radiofrequency ablation of 13 cases of IVT patients. Targets were excitated by primary targets of excitement and radioactive ablation, and VR was determined by radiofrequency ablation test. Targets were determined by the coincidence of VR and VT seizures. Results The success rate of immediate IVT in 13 patients was 13/13. VR performance: (1) sinus rhythm ablation occurs consistent with the onset of VT VR. Subsequent ventricular tachycardia (VT) appear intermittent sinus rhythm, double hair or ventricular premature beats, and ultimately completely restored into sinus rhythm. (2) there is inconsistent with the onset of VT VR. Conclusions VR, which coincides with the onset of VT, can be used as an indicator of effective ablation by generating VR consistent with the onset of VT.