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A 60-year-old male with history of benign prostatic hypertrophy presents complaining of nausea and vomit- ing. Laboratory values include serum Na of 145 mmol/L, blood urea nitrogen (BUN) of 45 mg/dL, creatinine of 2.0 mg/dL, urine Na of 10, and urine creatinine of 80. Which of the following is the MOST likely diagnosis?

  1. (A)  Prerenal failure

  2. (B)  Acute tubular necrosis (ATN)

  3. (C)  Glomerulonephritis

  4. (D)  Postrenal failure

  5. (E)  Pyelonephritis 


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(A)  Prerenal failure