Dermatologic Manifestations of Urticarial Vasculitis
- Author: Darius Mehregan, MD; Chief Editor: Dirk M Elston, MD more...
Urticarial vasculitis is an eruption of erythematous wheals that clinically resemble urticaria but histologically show changes of leukocytoclastic vasculitis.[1, 2] Urticarial vasculitis may be divided into normocomplementemic and hypocomplementemic variants. Both subsets can be associated with systemic symptoms (eg, angioedema, arthralgias, abdominal or chest pain, fever, pulmonary disease, renal disease, episcleritis, uveitis, and Raynaud phenomenon). The hypocomplementemic form more often is associated with systemic symptoms and has been linked to connective-tissue disease (ie, systemic lupus erythematosus [SLE]).[3, 4]
The pathophysiology of urticarial vasculitis is similar to other forms of cutaneous small vessel leukocytoclastic vasculitis. Urticarial vasculitis is a type III hypersensitivity reaction in which antigen-antibody complexes are deposited in the vascular lumina. This reaction results in complement activation and chemotaxis of neutrophils. These cells release various proteolytic enzymes, such as collagenase and elastase, resulting in damage to the vascular lumina. Some authors have speculated that eosinophils may be involved in the early stages of the vasculitic lesions. Patients with hypocomplementemic urticarial vasculitis are more likely to show autoantibodies to C1q and vascular endothelial cells.[5, 6] The presence of antineutrophilic cytoplasmic antibodies is rare. Many patients ultimately prove to have SLE. Other etiologies include drug reactions and parasitic infections.
The exact frequency of urticarial vasculitis is not known in the United States or worldwide.
Leukocytoclastic vasculitis displayed an incidence of 45 cases per million population from a study conducted in Olmsted County, Minnesota.
Previous studies varied in their definitions of the condition. However, when a study in the United Kingdom used consistent criteria restricted to patients diagnosed with vasculitis by biopsy and with urticarial lesions of more than 3 months duration, 2.1% of 1310 patients with urticaria were found to have urticarial vasculitis.
The male-to-female ratio for urticarial vasculitis is 1:2.
The median age of urticarial vasculitis involvement is 43 years, with a range of 15-90 years. While urticarial vasculitis is primarily a disease of middle-aged adults, it can be seen in persons of any age.
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