A 41-year-old man comes to the physician for a 6-month history of increasing fatigue. He has lost 10 pounds during this time. He is a non-smoker. The skin on his forearms is dark. Laboratory studies show:
Sodium 140 mEq/L
Potassium 5.7 mEq/L
Eosinophils 14%
Which of the following is most likely to be seen in this patient?
Decreased aquaporin insertion
Decreased intestinal absorption
Increased atrial natriuretic peptide secretion
Increased ENaC activity
Increased urinary bicarbonate
