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Review Question - QID 211109

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QID 211109 (Type "211109" in App Search)
A 54-year-old man with lymphoma presents to his oncologist with severe abdominal pain and flank pain. He says that the pain started 2 days ago and has gotten worse over time. He has also not been able to urinate over the same time period. On presentation, his temperature is 99°F (37.2°C), blood pressure is 110/72 mmHg, pulse is 95/min, and respirations are 12/min. Physical exam reveals bilateral flank tenderness. Labs results are shown below:

Blood urea nitrogen: 34 mg/dL
Creatinine: 3.7 mg/dl
Urine osmolality: 228 mOsm/kg

Renal ultrasonography shows dilation of the kidneys bilaterally with a normal-sized bladder. Which of the following would most likely be beneficial in treating this patient's condition?