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

1. Prerenal
   1. BUN/Cr ratio > 20
   2. FeNa < 1%
   3. FeUN <35%
2. Intrarenal
   1. FeNa <>1%
   2. FeUN >50%
3. Post-obstructive

Work-up

1. Urinalysis
2. Urine sodium, creatinine, urea (for those on diuretics)
3. Foley

Disposition

Admit

See Also

FEN: Hyperkalemia