title: Can renal ultrasonography predict early success after pyeloplasty in children? A prospective study.
abstract: OBJECTIVE
  To study the predictive value of 6 ultrasonographic (USG) parameters for early detection of children at risk of recurrent obstruction.
  
  
  METHODS
  A prospective nonrandomized study included all patients who underwent pyeloplasty between 2010 and 2012. All of the patients had completed at least 6 months of follow-up and preoperative and postoperative USG imaging data were available. The primary outcome was the correlation between USG and diuretic scintigraphic parameters. The secondary outcome was the predictive ability of the pelvicalyceal system parameters, measured by USG, of parenchymal growth after surgery.
  
  
  RESULTS
  Sixty-eight patients were evaluated. The mean age was 3.6 years (range 0.1-12). The mean (± standard deviation) differential renal function improved from 37.4 ± 11 ml/min to 37.7 ± 14 ml/min, which was a difference of no statistical significance. On the other hand, the mean (± SD) half-time (T1/2) significantly improved. After constructing a linear regression model of the 4 USG parameters and the parenchymal growth, the model explained 57.2% of the variance in parenchymal growth after pyeloplasty. The calyx-to-parenchyma ratio change was the largest unique contribution for explaining the variance in parenchymal growth, followed by anteroposterior diameter and calyceal dilatation.
  
  
  CONCLUSIONS
  We proved that calyx-to-parenchyma ratio, anteroposterior diameter and calyceal dilatation are independent predictors of early success after pyeloplasty.
authors.affiliation: Department of Urology, Mansoura University, Mansoura, Egypt.
authors.forename: Tamer E
authors.initials: TE
authors.lastname: Helmy
authors.forename: Ahmed
authors.initials: A
authors.lastname: Harraz
authors.forename: Doaa E
authors.initials: DE
authors.lastname: Sharaf
authors.forename: Yasser
authors.initials: Y
authors.lastname: El Demerdash
authors.forename: Ashraf T
authors.initials: AT
authors.lastname: Hafez
authors.forename: Hossam
authors.initials: H
authors.lastname: Gad
authors.forename: Mohammed
authors.initials: M
authors.lastname: Dawaba
mesh_terms: D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004231:Diuresis; D005260:Female; D006801:Humans; D007223:Infant; D007668:Kidney / Q000000981:diagnostic imaging* / Q000254:growth & development; D008297:Male; D011237:Predictive Value of Tests; D011446:Prospective Studies; D011859:Radiography; D020127:Recovery of Function; D015607:Stents; D013997:Time Factors; D016896:Treatment Outcome; D014463:Ultrasonography; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D013520:Urologic Surgical Procedures / Q000295:instrumentation / Q000379:methods*