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Prognostic indicators in children with IgA nephropathy--report of the Southwest Pediatric Nephrology Study Group
R J Hogg1, F G Silva, R J Wyatt
1Department of Pediatrics, Baylor University Medical Center, Dallas, TX 75246.
Insights
IgA nephropathy (IgAN) in children can lead to end-stage renal disease (ESRD) more often than previously thought. Key risk factors for ESRD in pediatric IgAN include glomerular sclerosis, hypertension, and proteinuria.
Area of Science:
- Pediatric Nephrology
- Immunology
- Renal Pathology
Background:
- IgA nephropathy (IgAN) is a common cause of glomerulonephritis in children.
- Understanding prognostic factors for IgAN progression to end-stage renal disease (ESRD) is crucial for early intervention.
- Previous studies primarily focused on adult populations, necessitating pediatric-specific data.
Purpose of the Study:
- To identify clinical and pathological predictors of ESRD in a cohort of children and adolescents with IgAN.
- To assess the incidence of ESRD in pediatric IgAN patients.
- To validate prognostic markers in a pediatric population.
Main Methods:
- Retrospective review of clinical and pathological data from 218 pediatric IgAN patients across 13 centers.
- Detailed analysis of 80 patients with a minimum 4-year follow-up.
- Statistical analysis including univariate and stepwise linear discriminant analysis to identify ESRD predictors.
Main Results:
- Seven variables significantly predicted ESRD: glomerular sclerosis, black race, hypertension, proteinuria, age at presentation, crescents, and male sex.
- Glomerular sclerosis, particularly when affecting 20% or more of glomeruli, was a strong predictor.
- The developed discriminant function accurately predicted ESRD in 95% of subjects.
Conclusions:
- ESRD occurs more frequently in American children with IgAN than previously recognized.
- Risk factors for ESRD in pediatric IgAN mirror those found in adult studies, emphasizing glomerular sclerosis, proteinuria, and hypertension.
- These findings highlight the need for vigilant monitoring and risk stratification in pediatric IgAN patients.
Abstract:
Investigators in 13 pediatric nephrology centers reviewed clinical and pathological features in 218 children and adolescents with IgA nephropathy (IgAN), with particular emphasis on 80 patients who had follow-up periods of at least 4 years. Potential prognostic markers in the 80 children were compared between 12 (15%) who developed end-stage renal disease (ESRD) versus 68 who did not. The relationship between clinical and pathological features and the subsequent development of ESRD was examined using stepwise linear discriminant analysis in addition to standard univariate analysis. Seven variables were found to be predictive of ESRD: the presence of glomerular sclerotic changes, especially when this was associated with proliferation or sclerosis in 20% or more of the glomeruli; black race; hypertension at biopsy; proteinuria at biopsy; age at presentation; crescents; male sex. Using the resulting discriminant function, development of ESRD could be correctly predicted in 95% of the subjects. We conclude that ESRD is more common in American children with IgAN than was realized previously. Risk factors previously documented in adult studies have been confirmed, especially the presence of glomerular sclerosis, proteinuria, and hypertension.