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New algorithm (KAWAKAMI algorithm) to diagnose primary cutaneous vasculitis.

Tamihiro Kawakami1

  • 1Department of Dermatology, St Marianna University School of Medicine, Kawasaki, Japan. tami@marianna-u.ac.jp

The Journal of Dermatology
|February 24, 2010
PubMed
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A new KAWAKAMI algorithm aids in diagnosing primary cutaneous vasculitis by analyzing skin lesions and specific antibody levels. This diagnostic tool helps refine treatment strategies for various vasculitis types.

Area of Science:

  • Dermatology
  • Immunology
  • Rheumatology

Background:

  • Cutaneous vasculitis diagnosis relies on clinical presentation and biopsy, but a standardized algorithm is needed.
  • Palpable purpura suggests small vessel vasculitis, while livedo racemosa and ulcerations indicate deeper vessel involvement.

Purpose of the Study:

  • To establish and apply the KAWAKAMI algorithm for diagnosing primary cutaneous vasculitis.
  • To integrate the Chapel Hill Consensus Conference classification with clinical and laboratory findings.

Main Methods:

  • The algorithm starts with serum antineutrophil cytoplasmic antibodies (ANCA) testing (myeloperoxidase-ANCA, proteinase 3-ANCA).
  • Further steps include cryoglobulin testing, direct immunofluorescence for immunoglobulin A deposition, and assessment for antiphospholipid antibodies.

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  • Histopathological evaluation of skin biopsy for necrotizing vasculitis in different dermal layers is crucial.

    • Main Results:

    • Positive myeloperoxidase-ANCA suggests Churg-Strauss syndrome or microscopic polyangiitis; proteinase 3-ANCA indicates Wegener's granulomatosis.
    • Immunoglobulin A deposition points to Henoch-Schönlein purpura.
    • Specific antibody profiles and histopathology differentiate cutaneous leukocytoclastic angiitis from cutaneous polyarteritis nodosa.

    Conclusions:

    • The KAWAKAMI algorithm offers a refined diagnostic approach for primary cutaneous vasculitis.
    • It facilitates targeted treatment, including anticoagulants for cutaneous polyarteritis nodosa and immunosuppressants for inflammatory cases.
    • Prophylactic renal complication management is proposed for Henoch-Schönlein purpura.