Outcomes of ureterorenoscopic stone treatment in 301 patients with a solitary kidney

To determine the stone-free rates and intra- and postoperative complication rates and grades of ureterorenoscopic stone treatment in patients with a solitary kidney. This study is a sub-analysis of the CROES-URS study, which is a prospective international multicenter observational study. Over a one year period consecutive patients treated with ureterorenoscopy for urinary stones were included. Patients entered in this analysis were those with a solitary functioning kidney. Descriptive data on patient characteristics, stone-free rates, complication rates and grades were evaluated for three separate groups: patients treated with ureteroscopy for ureteral stones, for renal stones and a combination of renal and ureteral stones. A total of 301 patients were treated for stones in a solitary kidney; 219 were treated for ureteral stones. In this group the stone free-rate was 88.6%, with an intra-operative complication rate of 7.4% and postoperative complication rate of 4.1%. Totally 57 patients were treated for renal stones. In this group the stone-free rate was 56.4%, with an intra-operative complication rate of 7.0% and postoperative complication rate of 10.5%. There were 25 patients who were treated for renal stones in combination with ureter stones. In this group the stone-free rate was 60.0%, with an intra-operative complication rate of 12.0% and postoperative complication rate of 10.5%. Within the three groups 72% of the postoperative complications were classified as Clavien I and II. Ureteroscopy is an effective and safe treatment modality for the removal of ureteral and renal stones in patients with a solitary kidney. Stone location as well as total stone burden seems to be important factors influencing the ability to render patients stone free . More, single session ureteroscopic stone removal was less effective for the treatment of larger renal stones or renal stones in combination with ureteral stones.