A 24-year-old man presents to your clinic with a history of episodes of diarrhea and crampy abdominal pain for the last 6 years. He comes to your office today after 3 days of severe diarrhea and...

A 24-year-old man presents to your clinic with a history of episodes of diarrhea and crampy abdominal pain for the last 6 years. He comes to your office today after 3 days of severe diarrhea and because he has noticed blood in his stool. Measurement of his blood pressure in the supine position is 100/60 and his heart rate is 90 beats per minute. His upright blood pressure drops to 80/50 and his heart rate increases to 110 beats per minute and he complains of feeling dizzy and nauseous. His serum sodium is 140 mEq/L.What is the most appropriate replacement fluid?

A. IV 0.9% saline

B. IV 0.45% saline

C. IV 5% dextrose

D. IV 3% saline

E. Chicken soup