title: Acute tubulointerstitial nephritis in 21 Japanese children.
abstract: METHODS
  We studied 21 Japanese children aged 1.2 to 14.9 years with biopsy-proven acute tubulointerstitial nephritis (ATIN; 5 drug-induced, 7 infection-related, 3 tubulointerstitial nephritis and uveitis syndrome (TINU), and 6 unclassified) for clinical presentation, laboratory findings, and outcome to clarify the clinical features of the entity. All developed acute renal failure with peak BUN values from 25 to 164 mg/dl (mean 83 mg/dl) and peak serum creatinine values from 1.5 to 15.1 mg/dl (mean 6.5 mg/dl). All the 7 infection-related ATIN were associated with Yersinia pseudotuberculosis infection. Four of the 21 patients underwent dialysis therapy for anuria and 1 patient in the unclassified ATIN showed progression to chronic renal failure.
  
  
  RESULTS
  In 20 patients, renal insufficiency lasted for 6 to 73 days: 5 drug-induced; median and ranges 25 (12-33) days, 7 infection-related; 15 (6-22) days, 3 TINU; 65 (55-73) days, and 5 unclassified; 24 (6-34) days. Oral steroid therapy was introduced to the 3 TINU patients because of the prolonged renal dysfunction. Although it was effective in all, 2 of them showed a deterioration of clinical symptoms or renal function after reducing the dosage of steroid.
  
  
  CONCLUSIONS
  Consequently, TINU patients required a longer period of time for the improvement of renal function compared to the other etiologies.
authors.affiliation: Department of Pediatrics, Keio University School of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Honda
authors.forename: N
authors.initials: N
authors.lastname: Yoshikawa
authors.forename: H
authors.initials: H
authors.lastname: Ito
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007564:Japan; D008297:Male; D009395:Nephritis, Interstitial / Q000175:diagnosis* / Q000209:etiology