ABSTRACT
Objective To study and evaluate the therapeutic safety and effect of frequency-doubled-double-pulse laser(FREDDY)lithotripsy for treating upper urinary calculi combined with acute renal failure.Methods The clinical data of 32 cases treated by frequency-doubled-double-pulse laser(FREDDY)lithotripsy were retrospectively analyzed.Results After the operation the serum BUN and Cr levels in the patients got close or returned to normal and the free rate of the stones was up to 90.6%(29/32).Conclusions The ureteroscopic frequency-doubled-double-pulse laser(FREDDY)lithotripsy has the advantage of safety,high efficiency and less trauma for treating the upper urinary tract obstruction combined with acute renal failure.It can also deal with the bilateral ureteral stones at one time.It can be the first choice when the condition is proper.