The assessment of the peripheral hemodynamics by pulse propagation of video photoplethysmography

Abstract

Video photoplethysmography (VPG) is pulse wave extracted from skin color change and contains various vital information such as pulse rate. Since the pulse transit time (PTT) from proximal to distal region correlates with blood pressure, it is expected to estimate blood pressure from PTT. However, PTT is affected by not only blood pressure but vascular compliance. That is why, regular calibration is necessary for the estimation. Our group has proposed a VPG extraction algorithm based on repetitive periodic component analysis (rPiCA), which is more robust than conventional methods. It was also indicated the possibility to use VPG for evaluation of peripheral hemodynamics instead of PPG. In this study, the influence of the change in both blood pressure and peripheral vascular compliance to pulse wave propagation by using VPG.Consequently, the characteristic changes in not only PTT but the VPG waveform were observed according to the change in the peripheral hemodynamics.