A 25 y.o. old man with a history of Croh's disease and pulmonary coccidioidomycosis (valley fever, fungal) is admitted because of abdominal pain, vomiting, diarrhea, fatigue, and decreased oral intake. On physical examination, the patient is in mild to moderate distress with a heart rate 140/min, blood pressure 80/40 mmHg, RR 18, and temp 99.8*F.
His mucous membranes are dry, BUN is normal but creatinine is elevated. His abdominal exam reveals diffuse tenderness to palpation with hyperactive bowel sounds.
QUESTION: Why is initiation of rapid infusion of normal saline the most appropriate intervention as oppose to Dobutamine HCl, norepinephrine and renal dialysis?