ArticleJournal of nephrology2025
Factors associated with pauci-immune glomerulonephritis in patients undergoing kidney biopsy with positive anti-neutrophil cytoplasmic antibody results.
Article in Journal of nephrology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundPauci-immune glomerulonephritis (GN) is a typical renal manifestation of anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). However, patients positive for ANCA can present with kidney pathologies other than pauci-immune GN. This study aimed to investigate and compare the characteristics of ANCA-positive patients diagnosed with pauci-immune GN to those with non-pauci-immune kidney diseases, based on kidney biopsy findings.
methodsWe retrospectively analyzed the electronic medical records of ANCA-positive patients who underwent kidney biopsy from January 2010 to October 2023 at a single tertiary center in Seoul, Republic of Korea. Logistic regression analysis was performed to identify variables associated with the diagnosis of pauci-immune GN in this cohort.
resultsOf 268 ANCA-positive patients, 195 (72.8%) were diagnosed with pauci-immune GN, while 73 (27.2%) had other kidney diseases. The most common pathologies in the non-pauci-immune GN group were IgA nephropathy (20.5%) and lupus nephritis (16.4%). Compared to the non-pauci-immune GN group, patients with pauci-immune GN exhibited higher platelet counts and C-reactive protein (CRP) levels, along with lower estimated glomerular filtration rate (eGFR). Urine abnormalities, categorized by the presence or absence of hematuria and/or proteinuria, differed significantly between the groups. Multivariate analysis identified hematuria and pulmonary involvement as significant predictors of pauci-immune GN.
conclusionsApproximately 70% of our ANCA-positive patients who underwent kidney biopsy were diagnosed with pauci-immune GN. Predictive factors for pauci-immune GN included platelet count, CRP levels, eGFR, hematuria, and pulmonary involvement. Identifying these clinical and laboratory markers may be valuable for improving the diagnostic approach towards AAV-related kidney manifestations.
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