Overview
Complement component 3 glomerulonephritis (C3GN) is a rare form of glomerulonephritis characterized by predominant deposition of complement component 3 (C3) in the glomeruli, often associated with tubulointerstitial damage and progressive renal failure 1.Diagnosis
Histopathological Examination: Characterized by diffuse thickening of the glomerular basement membrane with C3 predominant deposition on immunofluorescence 1.
Renal Biopsy: Essential for definitive diagnosis, assessing glomerular and tubulointerstitial changes 1.
Serum Biomarkers: Elevated serum creatinine and proteinuria are common but non-specific 1.Management
Plasma Exchange: Used in severe cases to reduce circulating immune complexes (specific dosing not detailed in abstracts) 1.
Immunosuppressive Therapy: First-line treatment often includes corticosteroids and cyclophosphamide or rituximab to control immune-mediated injury 1.
Angiotensin-Converting Enzyme (ACE) Inhibitors/Angiotensin Receptor Blockers (ARBs): Recommended to manage hypertension and reduce proteinuria 1.Special Populations
Pregnancy: Limited data; management focuses on maternal renal function preservation with careful monitoring and individualized immunosuppressive therapy 1.
Pediatrics: Diagnosis and management similar to adults, but tailored to pediatric dosing and developmental considerations 1.
Elderly: Careful risk-benefit assessment for immunosuppressive agents due to increased susceptibility to side effects 1.
Comorbidities: Management strategies adjusted to address concurrent conditions, emphasizing renal protection and cardiovascular risk reduction 1.Key Recommendations
Renal Biopsy for Diagnosis: Essential for confirming C3GN and guiding treatment 1. (Evidence: Strong)
Initiate Immunosuppressive Therapy: Corticosteroids combined with cyclophosphamide or rituximab for disease control 1. (Evidence: Moderate)
Use ACE Inhibitors/ARBs: To manage hypertension and reduce proteinuria in patients with C3GN 1. (Evidence: Moderate)References
1 Sarich VM, Wilson AC. Quantitative immunochemistry and the evolution of primate albumins: micro-complement fixation. Science (New York, N.Y.) 1966. link