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Giant cell arteritis.

Stuart C Carroll1, Brent J Gaskin, Helen V Danesh-Meyer

  • 1Department of Ophthalmology, University of Auckland, Auckland, New Zealand.

Clinical & Experimental Ophthalmology
|April 22, 2006
PubMed
Summary
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Giant cell arteritis (GCA) is an immune-mediated vasculitis affecting older adults, potentially causing permanent vision loss. Polymyalgia rheumatica may be a related condition, and corticosteroids are the primary treatment for GCA.

Area of Science:

  • Rheumatology
  • Immunology
  • Vascular Medicine

Background:

  • Giant cell arteritis (GCA) is an immune-mediated vasculitis affecting medium- to large arteries in individuals over 50.
  • Visual loss is a common and severe complication of GCA.
  • The exact etiology and pathogenesis of GCA remain incompletely understood despite recent advances.

Purpose of the Study:

  • To review the current understanding of GCA's etiology, pathogenesis, diagnosis, and treatment.
  • To clarify the relationship between GCA and polymyalgia rheumatica.
  • To emphasize the importance of early detection and corticosteroid treatment in preventing visual complications.

Main Methods:

  • Review of existing literature on GCA, including genetics, molecular biology, and histopathology.

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  • Analysis of clinical presentations and diagnostic challenges.
  • Evaluation of treatment strategies, particularly corticosteroids.

    • Main Results:

    • GCA affects extracranial arteries, leading to luminal occlusion and end-organ ischemia, particularly affecting carotid artery branches.
    • Polymyalgia rheumatica is now considered a different manifestation of the same underlying vasculitic disorder as GCA.
    • Corticosteroids are the only proven treatment, with high-dose initiation followed by a slow taper being effective in preventing vision loss.

    Conclusions:

    • GCA is a serious condition requiring prompt diagnosis and treatment.
    • While the underlying cause is unknown, understanding its mechanisms and relationship with polymyalgia rheumatica is advancing.
    • Effective management with corticosteroids can prevent severe outcomes like permanent blindness.