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  • Title: Location of skin lesions in Henoch-Schönlein purpura and its association with significant renal involvement.
    Author: St John J, Vedak P, Garza-Mayers AC, Hoang MP, Nigwekar SU, Kroshinsky D.
    Journal: J Am Acad Dermatol; 2018 Jan; 78(1):115-120. PubMed ID: 29241772.
    Abstract:
    BACKGROUND: Henoch-Schönlein purpura (HSP) is a small vessel IgA-predominant vasculitis. OBJECTIVE: To describe adult patients with HSP and determine if the distribution of skin lesions (ie, purpura above the waist or purpura below the waist only), is a predictor of significant renal involvement at the time of the skin biopsy and the months following. METHODS: A retrospective study on renal function from 72 adult patients with skin-biopsy proven HSP. Longitudinal renal data were analyzed after HSP diagnosis by using baseline renal function for comparison. RESULTS: Statistical analysis adjusted for sex, age, and baseline creatinine revealed a trend between HSP lesions only on the upper and lower extremities and long-term renal involvement (4.767, P = .067). Moreover, in another analysis adjusted for age and baseline creatinine, lesions located only on the upper and lower extremities significantly increased the odds of having long-term significant renal involvement (6.55, P = .049) in men. LIMITATIONS: This retrospective study used patient information that was subject to selection bias. CONCLUSION: In patients with HSP, skin lesion distribution on the extremities might be predictive of significant long-term renal involvement and might be critical for risk stratification and development of personalized diagnostics and therapeutics.
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