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  • Title: Increased serum uric acid levels are associated to renal arteriolopathy and predict poor outcome in IgA nephropathy.
    Author: Russo E, Drovandi S, Salvidio G, Verzola D, Esposito P, Garibotto G, Viazzi F.
    Journal: Nutr Metab Cardiovasc Dis; 2020 Nov 27; 30(12):2343-2350. PubMed ID: 32912790.
    Abstract:
    BACKGROUND AND AIMS: IgA nephropathy (IgAN) is the most common primary glomerulonephritis worldwide and a leading cause of end stage renal disease (ESRD). In addition to classical progression factors, other atherosclerosis-related factors, including hyperuricemia (HU), have been associated to the renal progression of IgAN. Increased serum uric acid (SUA) levels are well known to be concomitant of cardiovascular and kidney diseases, and have been proposed to be implicated in the development of arteriolar damage (AD). The aim of the present study was to explore the correlation between SUA levels, renal damage and its implication for outcome in IgAN patients. METHODS AND RESULTS: Clinical, laboratory and histologic data of 145 patients with biopsy proven IgAN were collected and retrospectively analyzed to determine the correlation between SUA levels, renal damage and the primary outcome (death or ESRD). Biopsy-proven AD was defined by the presence of arteriolar hyalinosis and/or intimal thickening. HU, defined as the highest SUA gender-specific tertile, was >7.7 mg/dl for males and >6.2 mg/dl for females. The prevalence of AD increased with the increase in the SUA level tertiles (p = 0.02). At logistic regression analysis SUA was independently related to the presence of AD (OR 1.75 [95%CI 1.10-2.93], p = 0.03). HU and AD had a synergic impact on progression of IgAN. Patients having both AD and HU, showed a reduced survival free from the primary outcome as compared to those having only one risk factor or neither (p = 0.01). CONCLUSIONS: SUA levels are independently associated with AD and poor prognosis in patients with IgAN.
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