04-27-2006, 12:48 PM
A 72-year-old man comes to the physician because of an 8-month history of feeling light-headed when he stands up. Blood pressure is 130/85 mm Hg while supine and 94/64 mm Hg while standing. High-dose fludrocortisone therapy is started. After 5 days of treatment, laboratory studies are most likely to show which of the following changes?
Serum Urine
K+ Renin K+ excretion
A) ↓ ↑ ↑
B) ↓ ↑ ↓
C) ↓ ↓ ↑
D) ↑ ↑ ↓
E) ↑ ↓ ↑
F) ↑ ↓ ↓
Serum Urine
K+ Renin K+ excretion
A) ↓ ↑ ↑
B) ↓ ↑ ↓
C) ↓ ↓ ↑
D) ↑ ↑ ↓
E) ↑ ↓ ↑
F) ↑ ↓ ↓