Overview
Toxic acute tubular necrosis (TAN) is a severe form of acute kidney injury characterized by widespread necrosis of renal tubular cells, often secondary to severe systemic insults such as sepsis, shock, or certain medications like nephrotoxins.Diagnosis
Clinical Presentation: Acute kidney injury with oliguria or anuria, elevated serum creatinine, and characteristic changes on urinalysis (hematuria, cylindruria, granular casts) 1.
Laboratory Tests: Elevated serum creatinine, blood urea nitrogen (BUN), and fractional excretion of sodium (FENa) <1% 1.
Imaging: Renal ultrasound may show reduced kidney size or increased echogenicity 1.
Renal Biopsy: Definitive diagnosis showing tubular cell necrosis and inflammation (indicated in refractory cases) 1.Management
Fluid Management: Aggressive fluid resuscitation to maintain hemodynamic stability 1.
Control Underlying Cause: Prompt discontinuation of nephrotoxic agents and management of underlying conditions (e.g., sepsis, shock) 1.
Supportive Care: Maintenance of adequate nutrition, electrolyte balance, and acid-base status 1.
Dialysis: Initiation of renal replacement therapy (RRT) in cases of severe hyperkalemia, acidosis, or fluid overload 1.
Monitoring: Frequent monitoring of renal function, electrolytes, and fluid balance 1.Special Populations
Pregnancy: Management focuses on maternal stability and fetal monitoring; RRT may be necessary with careful consideration of risks 1.
Pediatrics: Tailored fluid and electrolyte management; close monitoring for developmental impacts 1.
Elderly: Emphasis on minimizing complications and optimizing supportive care due to increased comorbidities 1.
Comorbidities: Careful management of coexisting conditions to prevent exacerbation; individualized treatment plans 1.Key Recommendations
Early Recognition and Management of Underlying Causes: Prompt identification and treatment of precipitating factors such as sepsis and nephrotoxic drug exposure (Evidence: Strong) 1.
Aggressive Fluid Resuscitation: Initiate early and maintain adequate hydration to support hemodynamic stability (Evidence: Strong) 1.
Initiate Renal Replacement Therapy When Indicated: Use RRT for severe metabolic disturbances or fluid overload (Evidence: Moderate) 1.
Comprehensive Monitoring: Regular assessment of renal function, electrolytes, and fluid status to guide treatment adjustments (Evidence: Moderate) 1.
Specialized Care for Vulnerable Populations: Tailor management strategies for pregnant women, children, and elderly patients considering their unique needs (Evidence: Expert opinion) 1.References
1 Tasker F, Smith SP, Mohd Mustapa MF, de Berker DAR. British Association of Dermatologists national clinical audit on the management of Stevens-Johnson syndrome/toxic epidermal necrolysis in adults. Clinical and experimental dermatology 2024. link