Photoplethysmographic cuffless blood pressure estimation -Analysing of pulse wave feature

Abstract

Conventional blood pressure measurement is performed by compressing the upper arm with a cuff and temporarily stopping arterial blood. Therefore, the conventional cuff-type blood pressure monitor cannot continuously measure, and to use the cuff, the equipment also gets bigger. Cuffless blood pressure estimation method using photoplethysmography sensor capable of continuous measurement attracts attention. In the cuffless method, blood pressure is estimated from the waveform shape of the pulse wave. At that time, since the pulse wave has poor undulation and the baseline varies, the derivative pulse wave is used. However, the undulation of the backward wave of the derivative pulse wave may become unclear due to the influence of noise. In this research, in order to solve this problem, we propose a level crossing feature.