A 65-Year-Old Man Is Being Evaluated in the Hospital

A 65-year-old man is being evaluated in the hospital.  The patient was admitted 5 days ago for increasing lower extremity edema and dyspnea.  Medical history is significant for obesity hypoventilation syndrome, pulmonary hypertension, and chronic lower extremity edema.  Current temperature is 37.2 C (99 F) , blood pressure is 110/70 mm Hg, pulse is 90/min, and respirations are 16/min.  BMI is 50 kg/m².  Laboratory results are as follows: Which of the following is the most likely cause of the laboratory abnormalities in this patient?

A) Diuretic therapy
B) Interstitial nephritis
C) Osmotic diuresis
D) Renal artery stenosis
E) Tubular necrosis
F) Ureteral compression

Correct Answer:

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