Agreement and Precision of a Smartphone Application For Continuous Blood Pressure Monitoring

The purpose of the study is to compare the blood pressure values measured by a mobile application used with a smartphone and the values measured by reference method, which is the radial arterial line

Patients admitted to the post-anesthesia care unit after major surgeries (Erasme hospital)

Patient's arterial pressure will be measured with both measurement methods (novel smartphone application and the invasive arterial line).

The placement of an arterial line is standard of care in the investigators institution for patients scheduled for major surgeries. These patients spend 24 hours in the post-anesthesia care unit after their surgery for acute care management. Patient's blood pressure will be measured in parallel (same arm) with the mobile application and with the reference equipment (radial arterial line). Measures will be done during five times ( so five times one minute of recordings).

Blood pressure values obtained by the two methods will be compared to confirm the reliability of the data obtained with the mobile application.

Inclusion criteria

• Adult patients in the post-anesthesia care unit after major surgery
• equipped with an arterial catheters for perioperative management
• Informed Consent as documented by signature
• Good understanding of written and oral speaking

Exclusion criteria

• Patients that cannot sign informed consent
• Patients in emergency situation, are not legally competent, cannot understand the situation
• Known contact dermatitis to nickel/chromium
• Dyshythmia like bigeminy, trigeminy, isolated Ventricular Premature Beats (VPB), atrial fibrillation
• Lesion or deficiency on hand, preventing index obstruction of smartphone's camera