Principal Investigator is making changes to the protocol.

Robot assisted urological procedures are often long surgical cases that can potentially result in complicated postoperative hospital course. The amount of intravenous (IV) fluids administered to patients during these operations fluctuates based on the length of the case, surgical blood loss, hemodynamic monitors, and the discretion of the anesthesiologist. The goal of intraoperative fluid therapy is to maintain optimal tissue perfusion without causing fluid overload. We plan to use a goal directed fluid therapy protocol to optimize fluid status and analyze post-operative outcomes.

Inclusion Criteria:

• Patients undergoing robot-assisted laparoscopic urological procedures in which the patient would have an arterial catheter placed as part of their routine inoperative anesthetic management

Exclusion Criteria:

• Age less than 18;
• current pregnancy;
• history of congestive heart failure, arrhythmias, coagulopathy, cerebral vascular disease , COPD, significant liver or renal impairment, required FloTrac per treating anesthesiologist;
• patient refusal to consent