POS0826 SKIN LIMITED IGA VASCULITIS IN ADULTS
Background:IgA vasculitis (IgAV) could be limited to skin or evolve into a systemic disease, affecting characteristically joints, gastrointestinal tract and/or kidneys.Objectives:We aimed to look for differences between adult IgAV patients with disease limited to skin compared to systemic IgAV.Methods:Medical records of histologically proven adult IgAV cases, diagnosed between January 2010 and December 2020 at our secondary/tertiary rheumatology centre were analyzed.Results:During the 132-month observation period we identified 328 new IgAV cases (59.5% males, median (IQR) age 64.3 (45.1; 76.1) years). Ninety-four (40.2%) patients had skin limited disease, and the rest systemic IgAV.Clinical differences between skin limited and systemic adult IgAV are presented in table 1. Adults with IgAV limited to skin were significantly older, had less commonly skin lesions above the waistline and a lower level of C reactive protein compared to patients with a systemic disease. There were no differences in the frequency of skin necroses between the compared IgAV subgroups. The frequency of potential vasculitis triggers (prior infections, new medications, malignancy) was similar between the compared subgroups.Table 1.Clinical characteristics of IgA vasculitis patients with skin limited and systemic diseaseClinical characteristicsSkin limited IgAV (94)Systemic IgAV (234)P valueMale gender (%)54.361.50.263Age (years)*68.0 (55.0-80.5)61.5 (41.7-75.8)0.007Current smoker (%)13.821.80.123Antecedent infection (%)28.733.80.434New medication23.423.51.0History of cancer12.810.70.569Symptom duration (days)*7 (5-21)8 (5-14)0.756Purpura above waistline36.255.60.002Skin necroses (%)52.145.70.329ESR /mm/h) *32 (18-52)34 (17-53)0.873CRP (g/l) *13.5 (1-32)30 (11-68)<0.001Elevated serum IgA (%)50.649.10.892Legend: * median and IQR;Follow up data were available for 250 (76.2%) patients. During the follow up of median (IQR) 12.5 (6.8 – 22.4) months 35 patients relapsed (13/70 (18.6%) with skin limited IgAV and 22/180 (12.2%) with systemic IgAV, p= 0.224).Conclusion:Skin limited IgAV was associated with older age and less extensive skin puprura in adults. However, relapses of purpura were as common as in systemic IgAV.Disclosure of Interests:None declared