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How to interpret a deterioration of split function?

A Piepsz1, K Ismaili, M Hall

  • 1Department of Radioisotopes, University Hospital Saint-Pierre, 322 rue Haute, B-1000 Brussels, Belgium. amypiepsz@yahoo.com

European Urology
|April 14, 2005
PubMed
Summary
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A drop in split renal function in children does not always indicate kidney deterioration. Single kidney glomerular filtration rate (SKGFR) often shows stable or improved function, suggesting split function changes may not reflect true kidney health.

Area of Science:

  • Pediatric Nephrology
  • Urology
  • Nuclear Medicine

Background:

  • Split renal function (SRF) decrease is often a criterion for pyeloplasty in hydronephrosis, implying kidney deterioration.
  • The clinical significance of SRF changes, particularly in relation to overall kidney function, requires further investigation.

Purpose of the Study:

  • To evaluate if changes in single kidney glomerular filtration rate (SKGFR) parallel observed decreases in split renal function (SRF) of at least 5% in pediatric patients.
  • To determine if a decline in SRF accurately reflects a loss of functional capacity in the affected kidney.

Main Methods:

  • Retrospective analysis of 29 children with at least two Tc-99m mertiatide (Tc-99m MAG3) renographic studies showing SRF decrease ≥5%.
  • Comparison of SRF evolution with SKGFR, calculated using Tc-99m MAG3 SRF and overall glomerular filtration rate (GFR) from chromium Cr 51 ethylenediamine tetraacetic acid (EDTA) clearance.

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Main Results:

  • In children over two years old, SKGFR remained stable or increased in 63% of cases despite SRF decline.
  • In children under two years old, SKGFR was never observed to decrease, likely due to overall GFR maturation.
  • A decrease in SRF was not consistently associated with a corresponding decrease in SKGFR.

Conclusions:

  • Deterioration of split renal function in pediatric urological disorders does not necessarily indicate a loss of the affected kidney's functional capacity.
  • SKGFR provides a more nuanced interpretation of renal function than SRF alone, especially in pediatric populations.
  • Clinical decisions based solely on SRF decline may require re-evaluation in light of SKGFR findings.