Acute kidney injury

Definitions

ARF: Recent (over hours to days) decline in renal function

Oliguria: UO < 400cc/day

Anuria: UO < 100cc/day

Azotemia: Elevation in BUN

Uremia: Clinical syndrome resulting from the adverse effects of renal failure on other organ systems eg cardiovascular, central nervous, GI, heme, immunologic

Etiology

Prerenal

• BUN/Cr ratio > 20
• FeNa < 1%
• FeUN <35%

Intrarenal

• FeNa <>1%
• FeUN >50%

Post-obstructive

Work-up

Urinalysis

Urine sodium, creatinine, urea (for those on diuretics)

Foley

Disposition

Admit

See Also

FEN: Hyperkalemia