A neural network-based infection screening system that uses vital signs and percutaneous oxygen saturation for rapid screening of patients with influenza

Abstract

Objective: Influenza is a highly infectious viral disease, which occurs epidemically almost every winter in Japan. Rapid screening of patients with suspected influenza in places of mass gathering is important to delay or prevent transmission of the infection. The aim of this study was to assess the effectiveness of our newly developed infection screening system that employed vital signs and percutaneous oxygen saturation (SpO 2) as parameters in a clinical setting. Methods: Since SpO 2 accurately reflects respiratory status during influenza virus infection, we upgraded our previous system by adding SpO 2 as a new parameter to improve the screening accuracy. This system instantly measures SpO 2 and vital signs (i.e., heart rate, respiration rate, and facial temperature), which automatically detects infected individuals via a neural network-based nonlinear discriminant function using these derived parameters. We tested the system on 45 patients with seasonal influenza (35.8˚C < body temperature < 40.0˚C, 18-35 years) and 64 normal control subjects (35.0˚C < body temperature < 37.5˚C, 18-30 years) at Japan Self-Defense Central Hospital in 2012. Results: The system identified 40/45 patients with influenza and 60/64 normal control subjects, and provided sensitivity, specificity, and positive and negative predictive value (PPV, NPV) of 88.8%, 93.8%, 90.9%, and 92.3%, respectively. By including SpO 2 as a screening parameter, we achieved superior sensitivity and NPV compared to that reported in our previous paper (sensitivity = 88%; NPV = 82%). Conclusions: Our results suggest that SpO 2 is a good screening parameter that improves the accuracy of infection screening. The proposed system has the potential to efficiently identify infected individuals, thereby delaying or preventing the spread of infection during epidemic seasons.

Proof-of-principle Experiment on 24 GHz Medical Radar for Non-contact Vital Signs Measurement

“…Many previous works have used radar to collect and process signals to extract vital signs information. From the perspective of digital signal processing, the time domain peak-detection algorithm has been applied for the acquisition of respiration and heart signals [3]- [5], to create the infection screening systems in diagnosing influenza [6]. An ultra-wide band (UWB) radarbased system was developed to cancel harmonics as well as interference [7]- [9].…”