title: Contemporary results of endopyelotomy for ureteropelvic junction obstruction.
abstract: BACKGROUND
  Endopyelotomy is an accepted treatment option for ureteropelvic junction obstruction (UPJO). In this study, we reviewed our 7-year experience with antegrade endopyelotomy for UPJO.
  
  
  METHODS
  We reviewed the records of 35 consecutive antegrade endopyelotomy for UPJO between 1996 and 2002. Patients were included if they had shown radiographic evidence of UPJO on diuresis urography or intravenous urogram with signs and symptoms or deterioration of renal function.
  
  
  RESULTS
  A total of 34 consecutive patients underwent 35 antegrade endopyelotomy procedures in 35 renal units. One patient had bilateral endopyelotomy for bilateral UPJO. Eighteen renal units (51%) had concomitant renal calculi that required percutaneous nephrolithotomy, including 8 renal units with pelvi-ureteric junction stones. Twenty-four renal units (69%) had moderate degree of hydronephrosis whilst 11 renal units (31%) had severe hydronephrosis. The mean operating time for antegrade endopyelotomy was 94 +/- 28 minutes and the mean hospital stay was 4.7 +/- 2.8 days. No patients had conversion to open pyeloplasty and no patient required perioperative blood transfusion. The mean followup was 33 +/- 23 months and the overall success rate following endopyelotomy was 83% (n = 29 renal units). The success rate for primary UPJO was 81%, whilst the success rate for secondary UPJO was 84%. Four renal units (11%) required ancillary procedures for failed endopyelotomy. Two patients required repeat endopyelotomy, and 2 patients needed open pyeloplasty. Two patients were lost to follow-up.
  
  
  CONCLUSIONS
  Endopyelotomy remains a viable approach for UPJO compared to open reconstruction. Careful patient selection can optimise the surgical outcome and minimise endopyelotomy failures.
authors.affiliation: Department of Urology, Singapore General Hospital, Singapore. sim.hong.gee@singhealth.com.sg
authors.forename: H G
authors.initials: HG
authors.lastname: Sim
authors.forename: Y H
authors.initials: YH
authors.lastname: Tan
authors.forename: Myc
authors.initials: M
authors.lastname: Wong
mesh_terms: D000328:Adult; D004724:Endoscopy / Q000379:methods*; D005260:Female; D006801:Humans; D007682:Kidney Pelvis / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D014513:Ureter / Q000601:surgery*; D014517:Ureteral Obstruction / Q000601:surgery*