Detection effects of 4 near-infrared cerebral oximeters: a comparative study in simulated high altitude (4 500 m)

Objective To evaluate the detection effects of 4 brands of near-infrared cerebral oximeters (NICOs), INVOS 5100C (Medtronic), EGOS-600 (Aegean), MNIR-P100 (Mingxi) and BRS-1 (Casibrain Technology) in high-altitude environment. Methods From March 3, 2021 to March 16, 2021, a total of 174 healthy male volunteers (18~22 years old, 172.8±5.1 cm, BMI 22.5±2.2 kg/m2) were subjected from Army Medical University, and then randomly divided into 6 groups (n=29). Their regional cerebral oxygen saturation (rcSO2), instrument response time, blood pressure (BP), heart rate (HR), and pulse oxygen saturation (SPO2) were recorded and compared in the plain (300 m) and the 4 500-m altitude environment. The correlations among the above indicators were evaluated by Pearson correlation analysis. The difference and consistency of above indicators by the 4 devices were investigated. Results ① The effective detection rates of all 4 NICOs were 100% in 4 500 m environment. In the plain environment, the response time was 2.13±0.34, 6.60