School of Biomedical Engineering, Jimma Institute of Technology, Jimma University, Jimma, Oromia, Ethiopia.
Ethiop J Health Sci. 2022 Jul;32(4):841-848. doi: 10.4314/ejhs.v32i4.22.
Measurement of blood oxygen saturation is a vital part of monitoring coronavirus 2019 (COVID-19) patients. Pulse oximetry is commonly used to measure blood oxygen saturation and pulse rate for appropriate clinical intervention. But the majority of direct-to-consumer grade pulse oximeters did not pass through in-vivo testing, which results in their accuracy being questionable. Besides this, the ongoing COVID-19 pandemic exposed the limitations of the device in resource limited areas since independent monitoring is needed for COVID-19 patients. The purpose of this study was to perform an in-vivo evaluation of a newly developed smartphone powered low-cost pulse oximeter.
The new prototype of a smartphone powered pulse oximeter was evaluated against the standard pulse oximeter by taking measurements from fifteen healthy volunteers. The accuracy of measurement was evaluated by calculating the percentage error and standard deviation. A repeatability and reproducibility test were carried out using the ANOVA method.
The average accuracy for measuring spot oxygen saturation (SPO2) and pulse rate (PR) was 99.18% with a standard deviation of 0.57 and 98.78% with a standard deviation of 0.61, respectively, when compared with the standard pulse oximeter device. The repeatability and reproducibility of SPO2 measurements were 0.28 and 0.86, respectively, which is in the acceptable range.
The new prototype of smartphone powered pulse oximeter demonstrated better performance compared to the existing low-cost fingertip pulse oximeters. The device could be used for independent monitoring of COVID-19 patients at health institutions and also for home care.
血氧饱和度的测量是监测 2019 年冠状病毒（COVID-19）患者的重要部分。脉搏血氧仪常用于测量血氧饱和度和脉搏率，以便进行适当的临床干预。但是，大多数直接面向消费者的脉搏血氧仪没有经过体内测试，因此其准确性值得怀疑。此外，由于 COVID-19 患者需要独立监测，因此在资源有限的地区，正在进行的 COVID-19 大流行暴露了该设备的局限性。本研究旨在对新开发的智能手机供电的低成本脉搏血氧仪进行体内评估。
通过对 15 名健康志愿者进行测量，对新开发的智能手机供电的脉搏血氧仪原型与标准脉搏血氧仪进行评估。通过计算百分比误差和标准差来评估测量精度。使用方差分析（ANOVA）方法进行重复性和可再现性测试。
与标准脉搏血氧仪设备相比，测量点血氧饱和度（SPO2）和脉搏率（PR）的平均准确度分别为 99.18%，标准差为 0.57%和 98.78%，标准差为 0.61%。SPO2 测量的重复性和可再现性分别为 0.28 和 0.86，均在可接受范围内。
与现有的低成本指尖脉搏血氧仪相比，新开发的智能手机供电脉搏血氧仪原型具有更好的性能。该设备可用于医疗机构对 COVID-19 患者的独立监测，也可用于家庭护理。
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