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http://dx.doi.org/10.9718/JBER.2011.32.2.109

Analysis of Arterial Stiffness Variation by Photoplethysmographic DC Component  

Lee, Chung-Keun (Department of Electrical and Electronics Engineering, Yonsei University)
Shin, Hang-Sik (Department of Electrical and Electronics Engineering, Yonsei University)
Kong, In-Deok (Department of Physiology, Yonsei Wonju Medical School)
Lee, Myoun-Ho (Department of Electrical and Electronics Engineering, Yonsei University)
Publication Information
Journal of Biomedical Engineering Research / v.32, no.2, 2011 , pp. 109-117 More about this Journal
Abstract
Assuming that photons absorbed by a vessel do not have acute variations, DC component reflect the basal blood volume (or diameter) before blood pulsation. Vascular stiffness and reflection is influenced by changes in basal blood volume (or diameter). This paper describes analysis of the characteristic variations of vascular stiffness, according to relative variations in DC components of the PPG signal (25-75%). For quantitative analysis, we have used parameters that were proposed previously, reflection and stiffness index, and the second derivative of PPG waveform, b/a and d/a. Significantly, the vascular stiffness and reflections were increased according to increase in DC component of the PPG signal for more than about 3% of baseline values. The systolic blood pressure were increased from $113.1{\times}13.18$ to $116.2{\times}13.319$ mmHg, about 2.76% (r = 0.991, P < 0.001) and the AC component of the PPG signal were decreased from $2.073{\times}2.287$ to $1.973{\times}2.2038$ arbitrary unit, about 5.09% (r = -0.993, P < 0.001). It is separated by DC median and correlation analysis was performed for analyzing vascular characteristics according to instantaneous DC variations. There are significant differences between two correlation coefficients in separated data.
Keywords
Photoplethysmography; pulsatile component (AC); nonpulsatile component (DC); vascular stiffness; vascular reflection;
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