Acute kidney injury

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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