Proposal of an equation for cuffless blood pressure monitors and an experimental study on its estimation accuracy

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  • Nakajima Kazuki
    Department of Creation of New Photonics Industries, The Graduate Schoolfor the Creation of New Photonics Industries SIGMAKOKI Co.,Ltd.
  • Eda Hideo
    Department of Creation of New Photonics Industries, The Graduate Schoolfor the Creation of New Photonics Industries Photonics Innovations Co., Ltd.

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  • カフレス血圧計に用いる計算式の提案と推定精度に関する実験的検討

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The examination of cuffless blood pressure monitor equations is necessary to enhance the accuracy of blood pressure estimation. In this study, with the aim of improving the accuracy of cuffless blood pressure monitor equations, we utilized pulse wave and blood pressure data registered in a public database to create an optimal equation using parameters that can more accurately estimate blood pressure from characteristic values used in estimating blood pressure using pulse waves. Additionally, we conducted experiments to verify whether an experimental apparatus composed of a PC implementing this equation with a commercially available pulse oximeter meets the accuracy requirements for cuffless blood pressure monitors, according to the precision requirements of the non-invasive sphygmomanometry standards. The results of experiments conducted with 18 subjects aged between 20 and 50 years showed that the cuffless blood pressure calculated from pulse waves measured by the experimental apparatus using the optimal equation met the required accuracy, indicating the equationps potential for general use. Furthermore, it was considered that by using different values for the parameters of cuffless blood pressure calculation equations for systolic and diastolic blood pressure, the accuracy of blood pressure estimation could be improved.

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