Does the RIFLE Classification Improve Prognostic Value of the APACHE II Score in Critically Ill Patients?

Table 1

RIFLE classification for acute kidney injury.

Rating	GFR	Urinary output
Risk (Risk)	↑ SCr 1.5 X or ↓ GFR > 25%	<0.5 mL/kq/h for 6 h
Injury (Injury)	↑ SCr 2 X or ↓ GFR > 50%	<0.5 mL/kq/h for 12 h
Failure (Failure)	↑ SCr 3 X or >4 mg/dL or ↓ GFR > 75%	<0.3 mL/kq/h for 24 h or anuria for 24 h
Function Loss (Loss)	Total loss for 4 weeks+
Final Stage (End)	+3 months for Dialysis

RIFLE: Risk, Injury, Failure, Loss, End; GFR: glomerular filtration rate; SCr: serum creatinine. Adapted [13].