Comparison of Non-invasive and Invasive Blood Pressure Monitors

Inclusion Criteria

• •Patients between the ages of 18 - 90 years age who are undergoing any surgery or in the intensive care unit and require intra-arterial catheterization for continuous BP measurement.
• •Patients having elective surgeries.
• •Patients having emergent surgeries, but only if research staff can have appropriate time to review study with patient and obtain signature on fact sheet prior to administration of medications that could affect coherency.
• •Patients who are able to review, verbalize understanding, and sign fact sheet. If patient has a health care proxy (HCP) or legal guardian, study will be reviewed, and signature of HCP or legal guardian will be obtained.