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A Mouse Model to Evaluate the Long-Term Structural and Functional Outcomes after the Reversal of Prolonged Unilateral Ureteric Obstruction
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Comparative Outcome Analysis of Children Who Underwent Pyeloplasty for Ureteropelvic Junction Obstruction Associated

Mandy Rickard1, Luis H Braga2, Shreyas Gandhi3

  • 1McMaster University/McMaster Children's Hospital, Hamilton, Ontario, Canada; Clinical Urology Research Enterprise (CURE) Program, McMaster Children's Hospital, Hamilton, Ontario, Canada.

Urology
|July 25, 2016
PubMed

Insights

Children with supra-normal differential renal function (SNDRF) undergoing pyeloplasty often experience a significant decline in kidney function post-surgery. This suggests SNDRF may indicate hyperfiltration, not true elevated function, potentially delaying necessary treatment.

Area of Science:

  • Pediatric Urology
  • Nephrology
  • Surgical Outcomes

Background:

  • Ureteropelvic junction obstruction (UPJO) is a common cause of kidney dysfunction in children.
  • Differential renal function (DRF) is a key metric for assessing kidney function.
  • Supra-normal DRF (SNDRF) is defined as DRF ≥ 55%.

Purpose of the Study:

  • To compare pyeloplasty outcomes in pediatric UPJO patients with and without SNDRF.
  • To investigate the implications of SNDRF on postoperative renal function.
  • To determine if SNDRF represents true elevated function or compensatory hyperfiltration.

Main Methods:

  • A prospectively collected database of 151 pediatric pyeloplasty patients (2008-2015) was reviewed.
  • Preoperative renograms were available for 140 patients; 26 had SNDRF (DRF ≥ 55%).
  • A study group of 49 patients with pre- and postoperative renograms (change ≥ 5% in function) was analyzed.

Main Results:

  • Of 49 patients, 12 had SNDRF and 37 did not; baseline characteristics were similar.
  • Mean preoperative DRF was 60.2% in the SNDRF group vs. 44.3% in the non-SNDRF group.
  • 75% of SNDRF patients experienced a ≥5% loss in DRF postoperatively, compared to 5% of non-SNDRF patients (P < .01).

Conclusions:

  • A significant proportion of pediatric UPJO patients with SNDRF experience a decline in DRF after pyeloplasty.
  • SNDRF may represent hyperfiltration due to obstruction rather than true supra-normal renal function.
  • Recognizing SNDRF as potential hyperfiltration is crucial to avoid delaying beneficial surgical intervention.
Abstract

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