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Do current recommendations for kidney biopsy in nephrotic syndrome need modifications?
Sanjeev Gulati1, Ajay P Sharma, R K Sharma
1Department of Nephrology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Raebareli Road, Lucknow 226014, India. sgulati@sgpgi.ac.in
Pediatric Nephrology (Berlin, Germany)
|July 11, 2002
Summary
Current guidelines aim to reduce kidney biopsies in childhood idiopathic nephrotic syndrome (CINS) for minimal change disease (MCD). However, this study suggests refining criteria, focusing biopsies on steroid non-responders and those with specific clinical/biochemical markers to better avoid unnecessary procedures.
Area of Science:
- Pediatric Nephrology
- Renal Pathology
- Clinical Trial Design
Background:
- Current recommendations for kidney biopsy in childhood idiopathic nephrotic syndrome (CINS) aim to minimize procedures in minimal change disease (MCD).
- There is ongoing debate regarding the optimal criteria for performing kidney biopsies in children with idiopathic nephrotic syndrome.
- This study sought to evaluate the effectiveness of existing guidelines and propose modifications to reduce unnecessary biopsies in CINS.
Purpose of the Study:
- To prospectively assess the utility of current recommendations in avoiding kidney biopsies in children with MCD.
- To propose modifications to current guidelines for minimizing kidney biopsies in CINS.
- To analyze the histopathological spectrum and clinical/biochemical correlates in biopsied CINS patients.
Main Methods:
- Prospective study of 400 consecutive CINS patients.
- Kidney biopsy performed on 222 patients based on current recommendations.
- Analysis of histopathology, clinical parameters (hematuria, hypertension), biochemical markers (renal insufficiency, C3 levels), and response to steroid and cyclophosphamide treatment.
Main Results:
- Despite current guidelines, 34% of biopsied children had MCD.
- Focal segmental glomerulosclerosis (FSGS) was the most common finding (39%), followed by MCD (34.2%).
- Presence of two or more clinical/biochemical parameters and low C3 levels were indicative of membranoproliferative glomerulonephritis (MPGN).
- Steroid responders showed MCD, FSGS, or mesangioproliferative glomerulonephritis (MesPGN) on biopsy.
- Cyclophosphamide response correlated better with steroid responsiveness than histopathology.
Conclusions:
- Modifications to current kidney biopsy recommendations are suggested to further minimize biopsies in children with MCD.
- Proposed modifications include restricting biopsies to children aged 1-16 with specific clinical/biochemical parameters or those who are steroid non-responders.
- Decision-making for cyclophosphamide treatment could be guided by steroid response patterns, potentially obviating the need for routine pre-treatment biopsy.