Serum sodium levels throughout first few days of admission. Blue arrows represent dates of hospital stay. Note the peak value of 171 mmol/L on day 2 of admission (3/25) with eventual decline after initiation of Furosemide with Vasopressin. Concurrent Vasopressin dosing is evidenced by yellow arrows. Note the initiation at 0.5 mU/kg/hr on 3/24, with a maximum infusion rate of 8 mU/kg/hr on 3/25, and eventual decline in dosing starting 3/26.