Loop Band Validation Study

Inclusion Criteria: * Patient has capacity to consent for the study. * Anesthetic plan for an arterial line for vital sign monitoring during their surgical procedure. Exclusion Criteria: * Active Atrial Fibrillation * Active C-difficile * Amputation of the arm at the wrist or above * The Investigator and/or Clinical Research Nurse will conduct a visual inspection for attributes that may diminish device accuracy. These include but are not limited to: tattoos over the radial artery, burns or heavy scarring over the radial artery, fragile skin, any skin diseases affecting the wrist or arm, Physician discretion-any condition deemed inappropriate that will preclude use of the device.