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  • Title: Acute tubulointerstitial nephritis in children and chronic kidney disease.
    Author: Clavé S, Rousset-Rouvière C, Daniel L, Tsimaratos M.
    Journal: Arch Pediatr; 2019 Jul; 26(5):290-294. PubMed ID: 31281039.
    Abstract:
    BACKGROUND: Acute tubulointerstitial nephritis (ATIN) is a rare condition in children. The etiology, treatment, and outcome of childhood ATIN remain poorly understood. The long-term prognosis seems to be favorable; however, chronic kidney disease has been reported. This article describes clinical outcomes in a series of children with biopsy-proven ATIN. METHODS: All medical records with biopsy-proven ATIN between January 2006 and 2016 were retrospectively analyzed. The incidence, clinical features, etiology, treatment, and outcome were recorded for each patient. RESULTS: Over 10 years, ATIN was diagnosed in 25 cases (8%) based on 306 renal needle biopsies. The most frequent clinical signs were abdominal pain, asthenia/weight loss, and fever. A median glomerular filtration rate estimated at 30.1mL/min/1.73 m2 (16.5; 45.5). Drug-induced toxicity was the main etiology (eight patients). Other causes were TINU syndrome (tubulointerstitial nephritis and uveitis) (seven patients), infection (two patients), and toxic agents other than medication (one patient). No etiology was found in seven patients (idiopathic cases). Eighteen patients (72%) were treated with steroids. At the end of follow-up, eight patients presented chronic kidney disease, three hypertension, and three tubular dysfunction. Overall, renal function was highest in the idiopathic ATIN group and in children treated without delay. CONCLUSIONS: In a single-center 10-year series of biopsy-confirmed ATIN in children, drugs and TINU syndrome were the main etiologies of ATIN. This study suggests that children with idiopathic ATIN and prompt treatment have a better prognosis. In this series, occurrence of chronic kidney disease justified long-term follow-up.
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