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Hypocomplementemic urticarial vasculitis or systemic lupus erythematosus?

M Trendelenburg1, S Courvoisier, P J Späth

  • 1Laboratory of Immunonephrology and Clinic of Medicine B, University Hospital, Basel, Switzerland. trendelenbur@ubaclu.unibas.ch

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|October 12, 1999
PubMed
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Hypocomplementemic urticarial vasculitis syndrome (HUVS) often overlaps with systemic lupus erythematosus (SLE). Distinguishing HUVS as a separate entity from SLE remains challenging due to shared clinical and histological features.

Area of Science:

  • Nephrology
  • Immunology
  • Rheumatology

Background:

  • Hypocomplementemic urticarial vasculitis syndrome (HUVS) is an autoimmune condition.
  • Systemic lupus erythematosus (SLE) is a chronic autoimmune disease.
  • Understanding the relationship between HUVS and SLE is crucial for diagnosis and management.

Observation:

  • Two patients presented with typical signs of HUVS.
  • An inverse correlation between anti-C1q autoantibody titer and serum C1q antigen concentration was observed over two years.
  • One patient developed nephritis with immune deposits, and the other later met criteria for SLE.

Findings:

  • Histological findings, C1q deposits, and tubuloreticular inclusions suggested SLE in the first patient.
  • The second patient developed anti-double-stranded DNA antibodies, fulfilling SLE criteria after a two-year lag.

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  • The study highlights significant overlap between HUVS and SLE.

    • Implications:

    • Current criteria are insufficient to definitively distinguish HUVS as a separate entity from SLE.
    • Further research is needed to establish clear diagnostic criteria for HUVS.
    • This overlap necessitates careful evaluation of patients presenting with HUVS for concurrent SLE manifestations.