title: Evaluation of Postoperative Hydronephrosis Following Ureteroscopy in Pediatric Population: Incidence and Predictors.
abstract: To identify the incidence and associated factors of the postoperative hydronephrosis in pediatric patients who underwent ureterorenoscopy (URS) for renal or ureteral stones.
  
  
  
  We evaluated the results of 116 patients who underwent semirigid or flexible URS retrospectively. Primary end points of the study were to determine the incidence of postoperative hydronephrosis and factors associated with the development of postoperative hydronephrosis. Logistic regression analysis was used to define factors associated with the presence of hydronephrosis.
  
  
  
  Mean age of the population was 9.5 years and mean stone size was 9.4 mm. Hydronephrosis was detected in 32 (27.6%) patients. Stone-free status was achieved in 101 (87%) patients. Univariate analysis revealed history of ipsilateral URS, duration of operation, presence of impacted stone, development of ureteral injury during operation, and presentation with a renal colic episode as the parameter associated with increased risk of hydronephrosis. History of ipsilateral URS (odds ratio: 1.664, P = .027), presence of impacted stones (odds ratio: 1.788, P = .014), and development of ureteral injury during operation (odds ratio: 1.106, P = .039) were found to be the independent markers of developing postoperative hydronephrosis in a multivariate analysis.
  
  
  
  Ipsilateral hydronephrosis following URS develops in a significant portion of patients. In patients with history of ipsilateral procedure and those with an impacted stone and had ureteral injury, the risk of postoperative hydronephrosis is higher; therefore, physicians should keep these parameters in mind in the decision-making process of selective imaging postoperatively.
authors.affiliation: Department of Urology, Ankara University School of Medicine, Ankara, Turkey. Electronic address: migokce@ankara.edu.tr.
authors.forename: Mehmet Ilker
authors.initials: MI
authors.lastname: Gökce
authors.affiliation: Department of Pediatric Urology, Ankara University School of Medicine, Ankara, Turkey.
authors.forename: Onur
authors.initials: O
authors.lastname: Telli
authors.affiliation: Department of Urology, Ankara University School of Medicine, Ankara, Turkey.
authors.forename: Mete
authors.initials: M
authors.lastname: Özkıdık
authors.affiliation: Department of Urology, Ankara University School of Medicine, Ankara, Turkey.
authors.forename: Aykut
authors.initials: A
authors.lastname: Akıncı
authors.affiliation: Department of Pediatric Urology, Ankara University School of Medicine, Ankara, Turkey.
authors.forename: Perviz
authors.initials: P
authors.lastname: Hajıyev
authors.affiliation: Department of Pediatric Urology, Ankara University School of Medicine, Ankara, Turkey.
authors.forename: Tarkan
authors.initials: T
authors.lastname: Soygür
authors.affiliation: Department of Pediatric Urology, Ankara University School of Medicine, Ankara, Turkey.
authors.forename: Berk
authors.initials: B
authors.lastname: Burgu
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000453:epidemiology*; D015994:Incidence; D007669:Kidney Calculi / Q000601:surgery*; D008297:Male; D011183:Postoperative Complications / Q000453:epidemiology*; D012189:Retrospective Studies; D014514:Ureteral Calculi / Q000601:surgery*; D018666:Ureteroscopy