Purpose: We compared a current cohort of patients who underwent ureteroscopy to a cohort from the early 1980s to determine changes in success, indications and long-term complications of the procedure.
Materials and methods: A chart review was performed of 194 patients who underwent 209 ureteroscopic procedures at our institution during 1992. This group was then statistically compared to 317 patients who underwent 346 ureteroscopies between 1982 and 1985.
Results: The current indications for ureteroscopy were calculus extraction (67% of the cases), diagnosis (28%) and stent manipulation (5%). These indications differed from those of the early series, in which 84% of all ureteroscopies were performed for calculus extraction and 16% for diagnosis. Overall ureteroscopic success rate increased from 86 to 96% (p < 0.001). Success of stone extraction improved from 89 to 95% (p = 0.08, distal success rate 95 to 97% and proximal success rate 72 to 77%). Success of diagnostic inspections increased from 73 to 98% (p < 0.001). In the early series failure was usually due to inability to traverse the ureter (54% of the cases), while currently failure is due almost exclusively to impassable ureteral strictures (63%). The overall complication rate decreased from 20 to 12% (p = 0.01) and the rate of significant complications decreased from 6.6 to 1.5% (p < 0.05). Clinical followup (mean 36 months) for all patients and radiological followup (mean 9.8 months) for 67% of eligible patients detected only 1 ureteral stricture. The remaining patients were asymptomatic after the ureteroscopic procedure.
Conclusions: Improvements in ureteroscope design, accessories and technique have led to a significant increase in the success of diagnostic and therapeutic ureteroscopy while decreasing morbidity. Outpatient ureteroscopic stone extraction, particularly for distal ureteral calculi, is almost uniformly successful with low morbidity. The long-term complication rate of ureteroscopy is 0.5%.