A 65-year-old man has urine output of 10 mL/h following abdominal aoic aneurysmectomy. Acute tubular necrosis is suggested by the presence of which of the following?

A. Urine osmolality of more than 500 mOsm/kg

B. Urine sodium of more than 40 mEq/L

C. Fractional excretion of sodium of <1%

D. Blood urea nitrogen (BUN)-to-serum creatinine ratio (SCR) of more than 20

Correct Answer: Urine sodium of more than 40 mEq/L

Description: Oliguria-Acute tubular necrosis -Intrinsic Renal Failures Prerenal Failures Intrinsic Renal Failures Urine osmolality (mOsm/kg) >500 <350 Urine sodium (mEq/L) <20 >40 Fractional excretion of sodium <1% >2% BUN/SCR >20 <10 Urine/PCR >40 <20

Category: Surgery

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