Background Acute kidney injury is the new name for Acute renal failure, defined as a Cr increase of 0.5 mg/dL if baseline < 2.5 mg/dL, a 50% decrease in GFR, or a 20% increase if baseline > 2.5 mg/dL. Anuria is defined as UOP < 100 mL/24h, and oliguria is defined as UOP 100-400 mL/24h. […]