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Prevalence of antineutrophil cytoplasmic antibodies in patients with various pulmonary diseases or multiorgan

Dimitrios Vassilopoulos1, John L Niles, Alexandra Villa-Forte

  • 1The Henry Dunant Hospital, Athens, Greece.

Arthritis and Rheumatism
|April 11, 2003
PubMed
Abstract

Insights

Antineutrophil cytoplasmic antibodies (ANCA) testing in patients with conditions mimicking systemic vasculitis showed low specificity for ANCA-associated vasculitis. Combined immunofluorescence and ELISA assays are highly specific for Wegener's granulomatosis.

Area of Science:

  • Immunology
  • Rheumatology
  • Pulmonology

Background:

  • Systemic vasculitides are often mimicked by other severe diseases, leading to diagnostic challenges.
  • Accurate diagnosis is crucial for appropriate treatment and patient outcomes.

Purpose of the Study:

  • To assess the prevalence of antineutrophil cytoplasmic antibodies (ANCA) in patients with conditions that resemble systemic vasculitides.
  • To evaluate the diagnostic utility of ANCA testing in differentiating these conditions from actual vasculitides.

Main Methods:

  • Prospective study involving patients with severe multiorgan dysfunction (MOD) and pulmonary disorders.
  • ANCA detection using indirect immunofluorescence (IIF) and enzyme-linked immunosorbent assays (ELISAs) for antibodies against proteinase-3 and myeloperoxidase (anti-MPO).
  • Patients with Wegener's granulomatosis (WG) served as positive controls.

Main Results:

  • ANCA were detected in 16% of patients with nonvasculitic MOD and 17% of outpatients with pulmonary disorders.
  • The majority of positive IIF results in these groups showed atypical patterns.
  • Only one nonvasculitic patient had anti-MPO antibodies; 78% of WG patients were positive for ANCA by both IIF and ELISA.

Conclusions:

  • ANCA detection in diseases mimicking vasculitis has limited specificity.
  • Combined IIF and antigen-specific assays for ANCA are highly specific for diagnosing WG, microscopic polyangiitis, and Churg-Strauss syndrome.

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