title: Comparison of Surgical Outcomes between Dismembered Pyeloplasty with or without Ureteral Stenting in Children with Ureteropelvic Junction Obstruction.
abstract: OBJECTIVE
  To evaluate the impact of temporary internal ureteral stents on the surgical outcomes of dismembered pyeloplasty in children.
  
  
  METHODS
  The medical records of 70 children (76 renal units) who underwent dismembered pyeloplasty for ureteropelvic junction (UPJ) obstruction at at Asan Medical Center between January 2005 and December 2010 were retrospectively reviewed. We classified the renal units into the stented group (22 renal units) and the nonstented group (54 renal units). Fifty-four of 70 patients were male and their mean age was 2.2±3.8 years old. The mean follow-up period was 29.6±16.8 months.
  
  
  RESULTS
  Sixty-four children had unilateral UPJ obstruction. The mean stent duration was 31.9 days. As shown by evaluation of radiologic images, there were no significant differences between the stented group and the nonstented group during the follow-up period (p>0.05). The mean preoperative and postoperative anteroposterior pelvic diameters (APPDs) of the nonstented group were 31.3 mm and 15.1 mm, respectively (p<0.001). The preoperative and postoperative grades of hydronephrosis were 3.9 and 2.9, respectively (p=0.037). The mean preoperative and postoperative APPDs of the stented group were 36.4 mm and 15.6 mm, respectively (p<0.001). The preoperative and postoperative grades of hydronephrosis were 4 and 3.1, respectively (p<0.001). Repeat obstruction was shown in 4 subjects as a postoperative complication (5.7%). Two children from each group had recurrent UPJ obstruction, with percentages of 3.7% and 9%, respectively (p=0.575).
  
  
  CONCLUSIONS
  In a comparison of nonstented and stented groups during pediatric dismembered pyeloplasty for UPJ obstruction, no significant differences were found in the resolution of hydronephrosis or overall postoperative complications.
authors.affiliation: Department of Urology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
authors.forename: June
authors.initials: J
authors.lastname: Kim
authors.forename: Sungchan
authors.initials: S
authors.lastname: Park
authors.forename: Hyunho
authors.initials: H
authors.lastname: Hwang
authors.forename: Jong Won
authors.initials: JW
authors.lastname: Kim
authors.forename: Sang Hyeon
authors.initials: SH
authors.lastname: Cheon
authors.forename: Seonghun
authors.initials: S
authors.lastname: Park
authors.forename: Kun Suk
authors.initials: KS
authors.lastname: Kim