CNAP Accuracy in the Bariatric Surgery Population

This study will compare accuracy of a newly developed monitor for continuous non-invasive blood pressure monitoring (CNAP™ Monitor 500; CNSystems Medizintechnik AG, Graz, Austria) that provides beat-to-beat BP readings with two of the current and more commonly used intermittently oscillometric non-invasive blood pressure device (NIBP), and the invasive arterial line (IBP).

Inclusion Criteria:

• Patients who are scheduled for laparoscopic bariatric surgery for the treatment of obesity
• Patients in whom an indwelling arterial cannula will be placed for the surgical procedure

Exclusion Criteria:

• Patients with history of a peripheral neurologic or neuropathic disorder
• Patients in whom an invasive arterial cannula cannot be placed
• Patients with vascular implants at the sites of non-invasive blood pressure measurement (fingers and upper arm of the examined arm)
• Edematous patients