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Clinical features and prognosis in childhood IgA nephropathy
Insights
IgA nephropathy in children can have varying outcomes. Early symptoms like hematuria suggest a better prognosis, while proteinuria or nephritic syndrome indicate a poorer outlook, emphasizing careful monitoring.
Area of Science:
- Pediatric Nephrology
- Immunology
- Renal Pathology
Background:
- Immunoglobulin A (IgA) nephropathy is a common cause of glomerulonephritis in children.
- Understanding the long-term prognosis and factors influencing disease progression is crucial for effective management.
Purpose of the Study:
- To evaluate clinical, laboratory, and histological findings in children with IgA nephropathy.
- To determine the correlation between initial presentation and long-term outcomes.
- To identify predictors of chronic renal insufficiency in pediatric IgA nephropathy.
Main Methods:
- Retrospective analysis of 53 children diagnosed with IgA nephropathy.
- Follow-up of 44 patients for a mean of 6.2 years.
- Correlation of presenting symptoms (hematuria, proteinuria, nephritic syndrome) and biopsy findings with disease stage at follow-up.
Main Results:
- 18.2% achieved remission, 63.6% had microscopic hematuria with proteinuria < 1 g/m2/day, 11.4% had proteinuria > 1 g/m2/day, and 6.8% developed chronic renal insufficiency.
- Hematuria at onset correlated with better outcomes (Stage A/B), while proteinuria or nephritic syndrome correlated with poorer outcomes (Stage C/D).
- Proliferative glomerulonephritis with crescents was a strong predictor of poor outcome (p < .0001).
Conclusions:
- The prognosis of IgA nephropathy in childhood requires cautious evaluation.
- Disease onset and the severity of renal pathology are significant predictors of long-term outcomes.
- Early identification of risk factors can guide therapeutic strategies and improve patient management.
Abstract:
Clinical variables and laboratory and histologic findings were evaluated in 53 children with IgA nephropathy, of whom 44 were followed for a mean period of 6.2 years (range 1.2-14). At the end of the follow-up 8 patients (18.2%) had had no urinary anomalies for at least 1 year (stage A disease), 28 (63.6%) had microscopic hematuria with proteinuria < 1 g/m2/day (stage B), 5 (11.4%) had proteinuria > 1 g/m2/day (stage C), and 3 (6.8%) had chronic renal insufficiency (stage D). None of the patients in apparent remission presented with elevated serum IgA levels at disease onset. Gross or microscopic hematuria at onset correlated with stage A/B disease at the end of follow-up (p < .05) whereas the presence of proteinuria or nephritic syndrome at onset correlated with stage C/D disease after follow-up (p > .05). Presenting features of gross or microscopic hematuria without or with proteinuria (< 0.5 g/m2/day) correlated (p < .001) with minimal glomerular abnormalities at biopsy, whereas patients with nephritic syndrome had more severe histologic pictures. The presence of proliferative glomerulonephritis with crescents correlated (p < .0001) with poor outcome. The results demonstrate that the prognosis of IgA nephropathy in childhood must be viewed with caution and that outcome correlates with mode of onset and severity of the renal pathology.