Urticarial vasculitis: etiologies and clinical course

Area of Science:

• Dermatology
• Immunology
• Rheumatology

Background:

• Urticarial vasculitis (UV) is an inflammatory condition characterized by hives lasting over 24 hours.
• Understanding the clinical presentation and potential triggers of UV is crucial for effective management.

Purpose of the Study:

• To investigate the clinical characteristics, causes, and outcomes of urticarial vasculitis in a specific patient cohort.
• To compare these findings with existing data from Western countries.

Main Methods:

• Retrospective analysis of 64 patients diagnosed with urticarial vasculitis.
• Data collection included patient demographics, clinical features, laboratory findings, identified causes, and disease duration.
• Direct immunofluorescence (DIF) was used to assess immunoreactant deposits in skin lesions.

Main Results:

• A majority of patients (76.6%) experienced their first UV attack.
• Common findings included recurrent attacks, angioedema (23.4%), and systemic involvement (25%).
• Infections were the most frequent identified cause (29.7%), followed by drugs, malignancy, and SLE. DIF showed immunoreactant deposits in 54.7% of patients. The median disease duration was 85 days, with 70% symptom-free within a year. Idiopathic UV had a longer course than infection-induced UV. Patients in this cohort presented with less severe symptoms and lower rates of hypocomplementemic UV and SLE compared to Western populations.

Conclusions:

• Urticarial vasculitis exhibits diverse clinical presentations and variable durations.
• Infections are a significant trigger, and a substantial proportion of patients show immunoreactant deposits in skin lesions.
• The findings suggest potentially milder disease patterns in this cohort compared to Western studies, warranting further investigation.