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Prognostic indicators in childhood IgA nephropathy.

N Yoshikawa1, H Ito, H Nakamura

  • 1Department of Pediatrics, Kobe University Hospital, Japan.

Nephron
|January 1, 1992
PubMed
Summary

Renal biopsy findings in children with IgA nephropathy can predict long-term outcomes. A high percentage of glomeruli with crescents, sclerosis, and adhesions indicates a poor prognosis, while less than 30% suggests a better outlook.

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Area of Science:

  • Nephrology
  • Pediatric Nephrology
  • Pathology

Background:

  • IgA nephropathy (IgAN) is a common cause of glomerulonephritis in children.
  • Prognostic factors for IgAN in pediatric populations require further elucidation.
  • Early identification of children at risk for poor outcomes is crucial for timely intervention.

Purpose of the Study:

  • To assess the prognostic significance of clinical, laboratory, and pathological parameters in children with IgA nephropathy.
  • To identify reliable indicators of chronic renal impairment in pediatric IgAN.
  • To determine if initial renal biopsy findings can predict long-term outcomes in children with IgAN.

Main Methods:

  • Retrospective analysis of 200 children (<15 years) with IgAN and normal renal function at biopsy.
  • Mean follow-up of 5.0 years, assessing renal function and urinary abnormalities.
  • Correlation of biopsy findings (proteinuria, mesangial proliferation, glomerular sclerosis, crescents, adhesions, tubulointerstitial changes, electron microscopy findings) with patient outcomes.

Main Results:

  • Poor outcome (heavy proteinuria, chronic renal impairment) correlated with heavy proteinuria at biopsy, diffuse mesangial proliferation, increased glomeruli with sclerosis/crescents/adhesions, tubulointerstitial changes, and specific electron microscopy findings.
  • The percentage of glomeruli with crescents, sclerosis, and adhesions was the most reliable prognostic indicator.
  • 33% of patients with ≥30% glomeruli affected developed renal impairment vs. 1% with <30% (p<0.001); 14% vs. 51% had normal urine at follow-up (p<0.001).

Conclusions:

  • Initial renal biopsy findings allow for accurate early prediction of outcome in children with IgA nephropathy.
  • The proportion of glomeruli showing crescents, sclerosis, and adhesions is a key predictor of IgAN progression in children.
  • Risk stratification based on biopsy findings can guide clinical management and monitoring in pediatric IgAN.

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