A 43-Year-Old Previously Healthy Man Is Hospitalized After Sustaining a Head

A 43-year-old previously healthy man is hospitalized after sustaining a head injury in a motor vehicle collision.  Several days later, the patient develops worsening serum electrolyte disturbances.  Further evaluation reveals the cause is inappropriate antidiuretic hormone secretion.  Treatment with a vasopressin V2 receptor antagonist is initiated.  Which of the following changes are most likely to occur as a direct result of the administered medication?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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