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Abnormal urinalysis on day 7 in patients with IgA vasculitis (Henoch-Schönlein purpura)

Nozomu Kawashima1, Jun-Ichi Kawada2, Yuichi Nishikado3

  • 1Department of Pediatrics, Nagoya University Graduate School of Medicine, Nagoya, Japan; Children's Medical Center, Japanese Red Cross Nagoya First Hospital, Nagoya, Japan.

Nagoya Journal of Medical Science
|December 24, 2016
PubMed

Insights

An abnormal urinalysis on day 7 in children with IgA vasculitis (Henoch-Schönlein purpura) may predict persistent kidney disease. This early marker helps identify children at high risk for ongoing nephritis, guiding further management.

Area of Science:

  • Pediatric Nephrology
  • Immunology
  • Vasculitis Research

Background:

  • IgA vasculitis (Henoch-Schönlein purpura, HSP) can lead to rare but serious renal failure in children.
  • Identifying early markers for persistent nephritis is crucial for managing HSP.
  • The predictive value of an abnormal urinalysis on day 7 (7d-UA) for persistent nephritis is not well-established.

Purpose of the Study:

  • To retrospectively analyze risk factors for persistent nephritis in children diagnosed with IgA vasculitis.
  • To determine if an abnormal 7d-UA is a significant predictor of persistent nephritis 6 months post-diagnosis.

Main Methods:

  • Retrospective cohort study of 138 children with IgA vasculitis.
  • Analysis of urinalysis results at diagnosis, day 7, and 6 months post-diagnosis.
  • Multivariate analysis to identify independent risk factors for persistent nephritis.

Main Results:

  • Children with an abnormal 7d-UA had a significantly higher rate of abnormal urinalysis at 6 months (69%) compared to those with normal 7d-UA (6%).
  • Abnormal 7d-UA was the sole independent risk factor for abnormal urinalysis at 6 months (OR 54.3, P < 0.0001).
  • Negative predictive values for normal urinalysis and negative proteinuria at 6 months were high (0.94 and 0.98, respectively).

Conclusions:

  • An abnormal urinalysis on day 7 appears to be a significant independent risk factor for persistent nephritis in children with IgA vasculitis.
  • This early urinalysis finding may serve as a valuable surrogate marker for long-term kidney involvement.
  • Prospective studies are needed to confirm these findings and establish clinical utility.

Keywords:
Henoch–Schönlein purpuraIgA vasculitisabnormal urinalysiscomplement C3multivariate analysis

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