Background: Different maneuvers used to differentiate between AVNRT and AVRT underwent electrophysiological study, including PPI-TCL, VA tachy cardin Delta, VA, His refractory PVC, and this confirmed by ablation result. Patients and Methods: Patients with SVT, after gave four consent of patient, three or four catheters were into right ventricle, Coronary Sinus, His catheter, and ablator. After that four electrophysiological maneuvers done for him concentrating on his refractory PVC. 140 cases from Mach 2022 till August 2023. Results: Among 140 patients with SVT underwent electrophysiological study, four maneuvers done for him. His refractory PVC with 100% specificity and 91% specificity. Delta VA near theses result. While PPI-TCL 100% specificity and specificity and VA tachycardia near theses result. Conclusion: His refractory PVC one of important maneuvers in differentiation between AVNRT and AVRT.

Keywords : PVC , electrophysiological maneuvers ,AVNRT , AVRT