To evaluate the clinical performance of the Hypotension Prediction Index obtained from the continuous, non-invasive Clear Sight monitor.

To evaluate the clinical performance of the Hypotension Prediction Index obtained from the continuous, non-invasive ClearSight monitor.

Inclusion Criteria:

• All Patients 18 years or older undergoing surgery with the use of general anesthesia and with planned arterial catheter placement and use of the HPI monitor.

Exclusion Criteria:

• Adults unable to consent
• Individuals who are not yet adults ( infants, children teenagers)
• Pregnant Women
• Prisoners

All patents undergoing surgery with a planner arterial catheter placement