Group 3: Patients with ischemic ARF due to hypotension, surgery, or trauma ARF severity index 20-60% Creatinine clearance 12-14 mL/min Rising creatinine of at least 0.5 mg/dL per day for 2 days without evidence of recovery despite standard supportive care No drug or contrast induced renal failure No oliguric renal failure (creatinine clearance 3-4 mL/min) No prior chronic renal failure Baseline creatinine greater than 2.5 mg/dL (males) or 2.0 mg/dL (females) No ARF due to bacterial or fungal sepsis, nephrotoxins, acute tubulointerstitial nephritis, cyclosporine toxicity, bilateral renal vascular disease, or systemic diseases (hepatorenal syndrome, glomerulonephritis, renal vasculitis, etc.)