Objective To investigate the efficacy and safety of cool-tipped saline-irrigated catheter ablation of epicardial accesso-ry pathway in the patients after failure of conventional radiofrequency ablation .Methods 30 patients with epicardial accessory path-way after failuer of conventional radiofrequency ablation were included in this study ,among them ,25 cases of the left accessory pathway and 5 cases of the right accessory prathway used the cool-tipped catheter for conducting ablation through the endocardium (ventricular side or atrial side) or coronary sinus .Results All patients achieved success ,no intraoperative and postoperative related complications occurred .Conclusion The cool-tipped saline-irrigated catheter ablation of epicardial accessory pathway is effective and safe in the patients after failure of conventional radiofrequency ablation ,which may improve the success rate of epicardial acces-sory pathway ablation .

Objective To establishment a process of monitoring waste resin clearance in nuclear power plants, and to meet clearance requirements and simplify the monitoring work. Methods In accordance with the requirements specified in current laws, regulations, and standards in China, as well as the practice of slightly polluted waste resins generated during the operation of nuclear power plants, in-depth discussion was conducted on sampling methods, sample uniformity and representativeness tests, radiation monitoring contents and methods, and simplified monitoring processes, in order to accurately monitor the radionuclide activity of waste resins to be cleared. Results A process was established to monitor waste resin clearance in nuclear power plants. A total of 55 barrels of waste resins were cleared and the radiation levels met the requirements. Conclusion An effective clearance process can facilitate the sampling of representative resins, improve the accuracy of monitoring data, differentiate radioactive waste from cleared waste, and simplify the monitoring process. Our results provide a basis and reference for future waste resin clearance.