Valentin Maisons1,2, Jean-Michel Halimi1,2, Christelle Barbet2, Évangeline Pillebout3, Zhour El Ouafi4, Eric Thervet5,6, Benjamin Terrier6,7,8, Yanis Ramdani1,9, François Maillot1,9, Alexandra Audemard-Verger10,11. 1. University of Tours, Tours, France. 2. Department of Nephrology, Hopital Bretonneau, CHRU de Tours, Tours, France. 3. Department of Nephrology, Hopital Saint-Louis, APHP, Paris, France. 4. Department of Nephrology, CHU Limoges, Limoges, France. 5. Department of Nephrology, Hopital Européen Georges Pompidou, APHP, Paris, France. 6. University Paris Descartes, Paris, France. 7. Department of Internal Medicine, Hôpital Cochin, Paris, France. 8. National Referral Center for Systemic and Autoimmune Diseases, Hôpital Cochin, Paris, France. 9. Department of Internal Medicine and Clinical Immunology, CHRU Tours, University of Tours, Tours, France. 10. University of Tours, Tours, France. alexandra.audemardverger@univ-tours.fr. 11. Department of Internal Medicine and Clinical Immunology, CHRU Tours, University of Tours, Tours, France. alexandra.audemardverger@univ-tours.fr.
Abstract
BACKGROUND: Indications for kidney biopsy in adult IgA vasculitis (IgAV) remain debated and there are very few studies on this subject. The aim of this study was to establish a correlation between renal histological and clinical-laboratory data. METHODS: A retrospective multicenter study was conducted using three databases from French hospitals, gathered between 1977 and 2020. The study included 294 adult patients with IgAV who had undergone kidney biopsy assessed according to the prognostic "Pillebout classification". Different statistical models were used to test the correlations between histological and clinical-laboratory data: Cochran Armitage, ANOVA, Kruskal-Wallis and logistic regression. RESULTS: The patients were primarily men (64%), with a mean age of 52 years. The main organs and tissues involved were: dermatological 100%, digestive 48% and rheumatological 61%. All had features of kidney involvement. The median serum creatinine was 96 µmol/L serum albumin 35 g/L, and C-reactive protein 28 mg/L. Of the patients, 86% (n = 254) had hematuria and median proteinuria was 1.8 g/day. The only statistically significant correlation between the pathological stages and the clinical-laboratory data was the presence of hematuria (p = 0.03, 66% class I to 92% class IV). In multivariate analysis, only albuminemia was associated with extracapillary proliferation (p = 0.02; OR 0.94) and only age was associated with stages 3-4 (p = 0.03; OR 1.02). CONCLUSION: Our study suggests that there is no strict baseline correlation between renal pathology and clinical-laboratory data. Given the current knowledge, it seems relevant to recommend a kidney biopsy in the presence of significant and persistent proteinuria or unexplained kidney function decline.
BACKGROUND: Indications for kidney biopsy in adult IgA vasculitis (IgAV) remain debated and there are very few studies on this subject. The aim of this study was to establish a correlation between renal histological and clinical-laboratory data. METHODS: A retrospective multicenter study was conducted using three databases from French hospitals, gathered between 1977 and 2020. The study included 294 adult patients with IgAV who had undergone kidney biopsy assessed according to the prognostic "Pillebout classification". Different statistical models were used to test the correlations between histological and clinical-laboratory data: Cochran Armitage, ANOVA, Kruskal-Wallis and logistic regression. RESULTS: The patients were primarily men (64%), with a mean age of 52 years. The main organs and tissues involved were: dermatological 100%, digestive 48% and rheumatological 61%. All had features of kidney involvement. The median serum creatinine was 96 µmol/L serum albumin 35 g/L, and C-reactive protein 28 mg/L. Of the patients, 86% (n = 254) had hematuria and median proteinuria was 1.8 g/day. The only statistically significant correlation between the pathological stages and the clinical-laboratory data was the presence of hematuria (p = 0.03, 66% class I to 92% class IV). In multivariate analysis, only albuminemia was associated with extracapillary proliferation (p = 0.02; OR 0.94) and only age was associated with stages 3-4 (p = 0.03; OR 1.02). CONCLUSION: Our study suggests that there is no strict baseline correlation between renal pathology and clinical-laboratory data. Given the current knowledge, it seems relevant to recommend a kidney biopsy in the presence of significant and persistent proteinuria or unexplained kidney function decline.
Authors: J C Jennette; R J Falk; P A Bacon; N Basu; M C Cid; F Ferrario; L F Flores-Suarez; W L Gross; L Guillevin; E C Hagen; G S Hoffman; D R Jayne; C G M Kallenberg; P Lamprecht; C A Langford; R A Luqmani; A D Mahr; E L Matteson; P A Merkel; S Ozen; C D Pusey; N Rasmussen; A J Rees; D G I Scott; U Specks; J H Stone; K Takahashi; R A Watts Journal: Arthritis Rheum Date: 2013-01