Acute Kidney Injury IV: Diagnostic Studies and Prevention

Accurate diagnosis and prevention are critical in managing Acute Kidney Injury (AKI).

Diagnosis begins with identifying prerenal causes like dehydration, intrarenal causes like nephrotoxins, or postrenal causes like obstructions.

Key diagnostic indicators include serum creatinine and urine output.

While serum creatinine changes may appear later, reduced urine output (oliguria) can be an early sign of kidney dysfunction.

Urinalysis helps differentiate causes: Prerenal AKI shows normal sediment, while intrarenal AKI may reveal abnormalities like casts, hematuria, or pyuria, indicating tubular damage or infection.

Renal ultrasound and, if needed, CT scans are used to detect obstructions, though caution is advised with contrast agents.

Prevention focuses on monitoring at-risk patients, including those with chronic kidney disease, diabetes, or heart failure.

Hydration with IV saline before and after procedures involving contrast agents, such as coronary angiography, is essential.

Treating an infection promptly to prevent sepsis and avoiding nephrotoxic drugs, such as NSAIDs and aminoglycosides, can further reduce AKI risk.