Cutaneous leukocytoclastic vasculitis: the yield of direct immunofluorescence study
Kulthanan, K.; Pinkaew, S.; Jiamton, S.; Mahaisavariya, P.; Suthipinittharm, P.
Journal of the Medical Association of Thailand 87(5): 531-535
2004
ISSN/ISBN: 0125-2208 PMID: 15222524 Document Number: 2211
Background : Leukocytoclastic vasculitis (LCV) is a clinico-pathological entity. Previous direct immunofluorescence study (DIF) studies of vasculitis showed positive, findings mainly in the early stage of the disease. Objective : To study the positive yield and patterns of DIF in patients with various stages of LCV. Design : One hundred patients with LCV who attended the Department of Dermatology Siriraj Hospital from 1997 to 2000 were enrolled in the study. Results : The study showed immunoreactive deposits in blood vessel walls in 76 cases(76%). Forty seven per cent of patients showed immunoreactant deposit only in superficial blood vessel walls, 3% had deposits only in deep blood vessel walls. Superficial and deep blood vessel wall deposits were seen in 26%. Dermo-epidermal deposit in addition to blood vessel wall deposit was found in 39%. The most common immunoreactive deposit was C3 (71%), followed by IgM (35%), IgA (12%) and IgG (8%) respectively. The age. of the skin lesions at the time of biopsy ranged from 1 to 7 days. 82% of patients with one day old lesions showed immunoreactive deposits in the blood vessel walls and 74% of the group with lesions aged 2-7 days at the time of biopsy showed immunoreactive deposits in the blood vessel walls. Conclusion : The present study showed a 76% positive yield for DIF study inpatients with LCV when biopsies were performed within one week of onset. There was a tendency for the percentage of positive DIF results to decline when the biopsy was performed on lesions that were more than 1 day old.
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