Urological oncology

Abstract

Purpose: A prospective randomized controlled trial was conducted to evaluate whether postoperative ureteral stenting is necessary after ureteroscopic laser lithotripsy. Materials and Methods: A total of 58 patients with unilateral ureteral stones were randomized into either stented or unstented groups. Ureteroscopic laser lithotripsy was performed using a semirigid ureteroscope (6.5 / 7Fr) and holmium laser without ureteral orifice dilation. There were no selection criteria regarding stone size, location, preoperative ureteral obstruction and hydronephrosis. Endoscopic evidence of stone impaction or mucosal edema/damage did not exclude a patient from the study. Ureteral perforation on completion retrograde pyelogram was the only intraoperative criterion for study exclusion. Postoperative pain scores and symptoms were recorded. Excretory urography was performed to document stone-free status and stricture formation. Radionuclide scan was performed selectively to exclude functional obstruction when ureteral narrowing was found on excretory urogram.Results: Mean stone size +/-SD was 9.7 +/-4.0 mm. (range 4 to 27). Proximal ureteral stones accounted for 43% of all stones. Stented and unstented groups were comparable with respect to demographic data, stone parameters, preoperative obstruction and hydronephrosis. There was no significant difference in operating time, laser energy used, stone impaction and mucosal edema/damage between the 2 groups. Postoperative pain and symptoms were more severe and frequent (p < 0.05) in the stented group. However, there was no difference in the incidence of postoperative sepsis and unplanned medical visits. The stone-free and stricture formation rates showed no statistical difference between the 2 groups.Conclusions: Ureteral stenting is not necessary after uncomplicated ureteroscopic laser lithotripsy for ureteral stones. Ureteral stent increases the incidence of pain and urinary symptoms but does not prevent postoperative urinary sepsis and unplanned medical visits. Severity of preoperative obstruction and intraoperative ureteral trauma were not shown to be determining factors for stenting. Editorial CommentHistorically, placement of a ureteral stent after ureteroscopy for stone removal or fragmentation has been routine practice. However, recent retrospective studies and prospective, randomized trials have suggested that placement of a ureteral stent after uncomplicated ureteroscopy may be unnecessary and is associated with greater patient discomfort. The problem lies in what constitutes "uncomplicated". Some investigators restricted their series to distal ureteral calculi only. Others excluded patients requiring balloon dilation of the intramural ureter. Still others excluded patients in whom fragments were extracted after fragmentation, while others excluded patients in whom fragments were left behind! In all cases, it was left to the discretion of the surgeon to exclude patients in whom evidence of mucosal trauma or severe impaction were present. Thus, guidelines for selection o...