Furosemide will be prepared in bags that contain 1000 mg of furosemide per 250 mL of saline reaching a concentration of 4 mg/mL. All medication and placebo bags will have no identifiers that show what type of drug is being administered, for blinding purposes. Medication and placebo bags will have randomly generated study identifier numbers. The protocol in figure 2 will be followed to achieve a total urine output of 1mL/kg/h. The furosemide infusion rate will not exceed 4mg/min IV as this is the maximum set by the manufacturer.