Assisted Fluid Management IDE Study

Inclusion Criteria: * Be ≥ 18 years of age * Abdominal, pelvic, major peripheral vascular surgery expected to last \>2 hours post anesthesia induction * Participate or have authorized representative participate in the Informed Consent process and sign/date the IRB approved informed consent form. Exclusion Criteria: * Are \< 18 years of age * Emergent or cardiovascular surgical procedure * Are pregnant * Participation in any other drug, device, or biologic study concomitantly, or within the last 30 days (which may clinically interfere with this Clinical Study) * Refusal of patient or authorized representative to sign consent