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Disease pattern in cranial and large-vessel giant cell arteritis
A Brack1, V Martinez-Taboada, A Stanson
1Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA.
Arthritis and Rheumatism
|February 20, 1999
Summary
Giant cell arteritis (GCA) presents in distinct forms. Large-vessel GCA, affecting arm arteries, differs clinically and genetically from cranial GCA, necessitating tailored diagnostic and treatment strategies.
Area of Science:
- Rheumatology
- Vascular Medicine
- Immunogenetics
Background:
- Giant cell arteritis (GCA) is a systemic vasculitis typically affecting medium and large arteries.
- While cranial GCA is well-characterized, large-vessel involvement, particularly of the subclavian, axillary, and brachial arteries, presents unique diagnostic challenges.
Purpose of the Study:
- To identify distinct clinical, laboratory, and genetic features differentiating large-vessel GCA (LV-GCA) involving upper limb arteries from cranial GCA.
- To elucidate potential differences in the pathogenetic mechanisms between these GCA variants.
Main Methods:
- Retrospective chart review of 74 patients with subclavian/axillary/brachial artery GCA and 74 matched controls with cranial GCA.
- Analysis of initial symptoms, diagnostic delay, clinical findings, and laboratory results.
- Assessment of cytokine messenger RNA expression in arterial tissue and HLA-DRB1 allele distribution.
Main Results:
- Large-vessel GCA predominantly presented with upper extremity vascular insufficiency, unlike cranial GCA.
- Temporal artery biopsy was negative in 42% of LV-GCA cases.
- LV-GCA showed higher interleukin-2 gene expression and an overrepresentation of the HLA-DRB1*0404 allele.
Conclusions:
- GCA encompasses heterogeneous disease variants, including large-vessel GCA.
- Large-vessel GCA exhibits distinct clinical manifestations and may occur independently of cranial artery involvement.
- Diagnosis and treatment approaches for large-vessel GCA may differ from those for cranial GCA.