Clinical characteristics of childhood acute tubulointerstitial nephritis.

Background: Acute tubulointerstitial nephritis (ATIN) is a rare cause of acute kidney injury in children that can lead to chronic kidney disease. The aim of this study was to describe the presenting features, etiology, and clinical characteristics of childhood ATIN, and to evaluate treatment modalities and renal outcomes.

Methods: The study included 38 patients who had been diagnosed with ATIN, were younger than 18 years old, and were admitted for at least 6 months of follow up.

Results: The median age at diagnosis was 13.1 years (range 1.2-16.6 years). The female / male ratio was 1.37. The most common symptoms were abdominal pain (65.7%) and nausea / vomiting (55.2%). Twenty-three of the patients had a history of drug intake (60.5%), and the most active drugs in the etiology were non-steroidal anti-inflammatory drugs (56.5%). Eleven patients were given steroid therapy due to severe kidney involvement and rapid increases in serum creatinine values, and ten of those patients were drug-related ATIN cases. Other patients were given symptomatic treatment. Four patients needed several sessions of dialysis due to the severity of their acute renal failure. The follow-up creatinine and estimated glomerular filtration rate levels were not statistically different between the symptomatic and corticosteroid treated groups (P > 0.05).

Conclusions: Although our study was unable to show the beneficial effect of corticosteroid therapy on the extent of renal recovery, the use of steroids may be preferable in severe nephritis because of the rapid recovery of estimated glomerular filtration rate with corticosteroid therapy.