An emergency system for monitoring pulse oximetry, peak expiratory flow and body temperature of patients with COVID-19 at home: Development and preliminary application

Background COVID-19 is characterized by a rapid change in the patients condition, with major changes occurring over a few days. Our aim was to develop and evaluate an emergency system for monitoring patients with COVID-19, which may be useful in hospitals where more severe patients stay in their homes. Methodology/Principal findings The system consists of the home-based patient unit, which is set up around the patient and the hospital unit, which enables the medical staff to telemonitor the patients condition and help to send medical recommendations. The home unit allows the data transmission from the patient to the hospital, which is performed using a cell phone application. The hospital unit includes a virtual instrument developed in LabVIEW environment that is able to provide a real-time monitoring of the oxygen saturation (SpO 2 ), beats per minute (BPM), body temperature (BT) and peak expiratory flow (PEF). Abnormal events may be fast and automatically identified. After the design details are described, the system is validated by a 30-day home monitoring study in 12 controls and 12 patients with COVID-19 presenting asymptomatic to mild disease. Patients presented reduced SpO 2 (p<0.0001) and increased BPM values (p<0.0001). Three patients (25%) presented PEF values between 50 and 80% of the predicted. Three of the 12 monitored patients presented events of desaturation (SpO 2 <92%). The experimental results were in close agreement with the involved pathophysiology, providing clear evidences that the proposed system can be a useful tool for the remote monitoring of patients with COVID-19. Conclusions An emergency system for home monitoring of patients with COVID-19 was developed in the current study. The proposed system allowed us to quickly respond to early abnormalities in these patients. This system may contribute to conserve hospital resources for those most in need, while simultaneously enabling early recognition of patients under acute deterioration, requiring urgent assessment.