Table 1 Overview of the RIFLE criteria [9]

R(isk)

Increased serum creatinine × 1.5 or GFR decrease > 25%

UO < 0.5 mL/kg/u × 6 h

I(njury)

increased serum creatinine × 2 or GFR decrease > 50%

UO < 0.5 mL/kg/u × 12 h

F(ailure)

increased serum creatinine × 3, GFR decrease 75% or serum creatinine ≥ 4 mg/dL

UO < 0.3 mL/kg/u × 24 h or anuria × 12 h

L(oss)

Persistent ARF = complete loss of kidney function > 4 weeks

E(nd-stage kidney failure)

End stage kidney disease