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KMID : 1137820110320020109
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의공학회지
2011 Volume.32 No. 2 p.109 ~ p.117
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Analysis of Arterial Stiffness Variation by Photoplethysmographic DC Component
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Lee Chung-Keun
Shin Hang-Sik
Kong In-Deok
Lee Myoung-Ho
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Abstract
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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 to mmHg, about 2.76% (r = 0.991, P < 0.001) and the AC component of the PPG signal were decreased from to 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.
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KEYWORD
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Photoplethysmography, pulsatile component (AC), nonpulsatile component (DC), vascular stiffness, vascular reflection
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