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Clinicopathological correlation of IgA nephropathy in children
Insights
Proteinuria levels in children with IgA nephropathy correlate with kidney damage severity. Higher proteinuria indicates more severe glomerular changes and a greater risk of chronic renal failure, highlighting its value in assessing disease progression.
Area of Science:
- Pediatric Nephrology
- Immunopathology
- Glomerular Diseases
Background:
- Immunoglobulin A (IgA) nephropathy is a common cause of glomerulonephritis in children.
- Early detection and assessment of disease severity are crucial for managing IgA nephropathy.
- The relationship between proteinuria levels and histopathological findings in pediatric IgA nephropathy requires further elucidation.
Purpose of the Study:
- To investigate the correlation between the degree of proteinuria and the severity of glomerular damage in pediatric IgA nephropathy.
- To assess the prognostic value of proteinuria in predicting disease progression and renal function decline.
- To evaluate the utility of mass urine screening in identifying children with IgA nephropathy.
Main Methods:
- Retrospective analysis of 22 pediatric patients (aged 7-16 years) with IgA nephropathy.
- Patients were stratified into three groups based on baseline proteinuria: <0.5 g/day (Group A), 0.6-3.0 g/day (Group B), and >3.0 g/day (Group C).
- Clinical data, including proteinuria, and renal biopsy findings (glomerular basement membrane changes, IgA deposits, electron-dense deposits) were analyzed. Renal function and disease progression were monitored over 2.0-7.1 years.
Main Results:
- Proteinuria degree correlated with the severity of glomerular basement membrane changes, being most severe in Group C.
- IgA deposits were present in all groups, but capillary wall deposits were more frequent in Group C.
- Group C exhibited significant subendothelial and subepithelial deposits. Patients in Group A did not progress, while 4 in Group C developed chronic renal failure.
Conclusions:
- The degree of proteinuria is a valuable indicator of glomerular pathological damage in children with IgA nephropathy.
- Higher proteinuria levels are associated with more severe histological findings and a higher risk of chronic renal failure.
- Mass urine screening can identify children with IgA nephropathy, and proteinuria serves as a key parameter for assessing disease severity and prognosis.
Abstract:
22 patients with IgA nephropathy aged 7-16 years, 15 of whom were found by mass urine screening of school children, were divided into three groups based on the degree of their proteinuria at admission: group A (n = 6) below 0.5 g/day of urine protein, group B (n = 7) between 0.6 and 3.0, and group C (n = 9) above 3.0 g/day of urine protein. The degree of proteinuria seemed to be related to the severity of pathological changes of the glomerular basement membrane; most severe in group C, moderate in group B, and minimal in group A. IgA deposits in the mesangial area were found in all groups of patients, but those in the capillary walls were most frequently found in group C. In addition to electron-dense deposits in the mesangial area, which was found in all groups of patients, the subendothelial and subepithelial deposits were the most remarkable changes found in group C. During the clinical observation period, which was between 2.0 and 7.1 years, no patient belonging to group A progressed to groups B or C. 4 cases in group C developed chronic renal failure, but none in the other groups did. The amount of urine protein might be used as a valuable parameter of the pathological damage of the glomerulus in children with IgA nephropathy.