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Glomerular disease in two patients with urticaria-cutaneous vasculitis and hypocomplementemia
Summary
This study examined hypocomplementemia, vasculitis, and urticaria syndrome in two patients. Findings suggest this syndrome exists on a spectrum with systemic lupus erythematosus, not a distinct condition.
Area of Science:
- Nephrology
- Rheumatology
- Immunology
Background:
- The syndrome of hypocomplementemia, vasculitis, and urticaria (HVUS) is a rare condition.
- Understanding its relationship to other autoimmune diseases is crucial for diagnosis and management.
Observation:
- Two patients presented with recurrent urticaria, glomerulonephritis, and hypocomplementemia.
- Both patients had normal Cl inhibitor levels and detectable circulating immune complexes.
- Skin biopsies showed leukocytoclastic vasculitis with immunoglobulin and complement deposits.
Findings:
- Immune complexes in one patient were high molecular weight, suggesting systemic lupus erythematosus (SLE).
- This contrasts with low molecular weight Clq precipitins typically seen in HVUS.
- Renal biopsies revealed proliferative mesangial glomerulonephritis in both patients.
Implications:
- HVUS may represent a spectrum of disease rather than a discrete entity.
- This spectrum ranges from SLE to classic HVUS with low molecular weight Clq precipitins.
- These findings necessitate a broader differential diagnosis for patients presenting with these symptoms.