Contactless Assessment of Patient Vital Signs for Triage Using Remote Photoplethysmography in the Emergency Department

Remote photoplethysmography (rPPG) is a camera-based method that enables contactless measurement of variation in light absorbance by haemoglobin as reflected by the changes in skin colour/pixel intensity unperceivable by human eyes. Beat-to-beat variation of light-absorbance can be used to estimate the change in the arterial blood volume underneath the skin and different vital signs including the blood pressure, heart rate, respiratory rate and oxygen saturation (SpO2) of the patient. The investigators propose an observational prospective study to independently evaluate the accuracy of contactless vital sign measurements using a cell phone-based remote photoplethysmography (rPPG) technology. This study will recruit adult patients presenting to the Accident and Emergency Department (A\&E) of Queen Mary Hospital (QMH) between 1 August 2024 and 30 October 2024. The study will be divided into 2 stages. In the initial run-in period, the investigators will collect facial video data from 200 patients to calibrate the VitalsTM system in the A\&E environment. Then, the investigators will evaluate the accuracy of the VitalsTM in estimating vital signs of 1,000 ambulatory patients in the A\&E setting. A trained research nurse and research assistant will be deployed from 09:00 to 17:00 on weekdays to screen for eligible patients in the A\&E waiting hall and to recruit patient participants throughout the study period. In this study, the investigators will only recruit triage category 3 …

This description comes directly from the study's public registry record.

Rex Pui Kin Lam, MBBS, FHKCEM  ·  852 39179413  ·  lampkrex@hku.hk

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