Overview
Acute tubulointerstitial nephritis (ATIN) is a condition characterized by inflammation of the renal tubules and interstitium, often triggered by drug hypersensitivity reactions, leading to acute kidney injury 1.Diagnosis
Clinical Presentation: Acute renal failure with elevated blood urea nitrogen (BUN), serum creatinine, and decreased estimated glomerular filtration rate (eGFR) 1.
Laboratory Tests: Elevated BUN (>20 mg/dL), serum creatinine (>1.5 mg/dL), and decreased eGFR (<60 mL/min/1.73 m2) 1.
Renal Biopsy: Essential for definitive diagnosis, showing interstitial mononuclear cell and eosinophilic infiltration 1.
Differential Diagnosis: Exclude other causes of acute kidney injury such as glomerulonephritis, acute tubular necrosis, and obstructive uropathy 1.Management
Discontinue Triggering Agent: Immediately stop the suspected drug (e.g., isotretinoin) 1.
Supportive Care: Fluid management, monitoring of electrolytes, and dialysis if necessary 1.
Immunosuppressive Therapy: Consider corticosteroids for severe cases with significant inflammation 1.
Monitoring: Regular follow-up with renal function tests to assess recovery 1.Special Populations
Pediatrics: Recognize ATIN as a common cause of acute renal failure in children, often linked to drug exposure 1.Key Recommendations
Renal Biopsy for Diagnosis: Perform renal biopsy to confirm ATIN, especially in cases with suspected drug-induced nephritis 1 (Evidence: Moderate).
Discontinue Suspected Drugs: Immediately discontinue any suspected drug causing ATIN to halt further renal damage 1 (Evidence: Strong).
Consider Corticosteroids for Severe Cases: Use corticosteroids in severe cases with significant interstitial inflammation to manage immune response 1 (Evidence: Weak).References
1 Kaya Aksoy G, Koyun M, Akkaya B, Comak E, Gemici A, Akman S. Eosinophilic tubulointerstitial nephritis on treatment with isotretinoin. European journal of pediatrics 2016. link