Continuous non-invasive measurement of core vital signs in the hospital ward

Vital sign monitoring in the hospital ward is critical to provide valuable information to predict patient deterioration or treatment efficiency. The frequency at which patients' vitals should be assessed is a compromise between insufficient monitoring and work overload.This project, in collaboration with the company Rheo, aims at providing a photoplethysmography based solution for continuous monitoring of oxygen saturation (SpO2), heart rate, blood pressure and respiratory rate using a unique and non-invasive upper-arm-worn device.We collected a relevant dataset to evaluate the accuracy of the estimated vital signs. Performance of vital sign estimation algorithms met medical requirements. Overall performances obtained were 2.06% root mean square error (RMSE) for SpO₂, 0.88 cpm (cycle per minute) RMSE for respiratory rate, an error of -0.1 ± 7.8 mmHg for the systolic blood pressure estimate and 0.2 ± 4.3 mmHg for the diastolic blood pressure estimate and 2.08 bpm (beat-per-minute) RMSE for heart rate.The study demonstrates the feasibility of embedding algorithms for measuring various vital signs into one single non-invasive wearable device and reaching expected medical requirements.