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For the first 6 h following surgical repair of a leaking abdominal aortic aneurysm in a 70-year- old man, oliguria (total urinary output of 25 mL since the operation) has become a concern. Of most diagnostic help would be

a. Renal scan

b. Aortogram

c. Left heart preload pressures

d. Urinary sodium concentration

e. Creatinine clearance

in General Surgery by

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c. Left heart preload pressures