Abstract: Objective To investigate the efficacy of low rate,low energy of holmium laser combined with ureteral catheter in ureteroscopic lithotripsy to treat upper ureteral calculi.
Methods The clinical data of 120 patients with upper ureteral calculi performed with ureteroscopic lithotripsy from Sep.2017 to Sep.2019 was retrospectively alalyzed.The patients were divided into routine lithotripsy group(without catheter drainage，52 cases) and catheter drainage group(68 cases).The catheter drainage group was divided into high rate,high energy group(33 cases) and low rate,low energy group(35 cases).The operation time was statistically analysed.The postoperative stone shift rate and the postoperative stone-residual rate were also compared.
Results The operation time of the catheter drainage group[(35.4±5.5)min] was statistically lower than that of the routine lithotripsy group[(37.6±5.9)min](P<0.05).The postoperative stone shift rate in the catheter drainage group was statistically lower than that in the routine lithotripsy group:17.6% vs 34.6%(P<0.05).The postoperative stone shift rate in the low rate,low energy group was also statistically lower than that in the high rate,high energy group:11.4% vs 24.2%(P<0.05).
Conclusion Low rate,low energy of holmium laser combined with ureteral catheter is an effective method in ureteroscopic lithotripsy to treat upper ureter calculi,which reduces postoperative shift rate of stone and postoperative stone-residual rate,also shortens the operation time.

Key words: ureteral calculi, ureteroscopic lithotripsy, holmium laser, ureteral catheter