Key result
Increases in the DC component of the PPG signal by >3% of baseline were associated with increased vascular stiffness and systolic blood pressure.
Observational
Variations in the DC component of the photoplethysmographic signal correlate significantly with changes in vascular stiffness and reflection.
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PPG DC shifts may indicate stiffness in research; hypothesis-generating and should not yet change practice.
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 113.1×13.18 to 116.2×13.319 mmHg, about 2.76% (r = 0.991, P < 0.001) and the AC component of the PPG signal were decreased from 2.073×2.287 to 1.973×2.2038 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.
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Shin et al. (2011) reported an observational. Relative variations in DC components of the PPG signal was evaluated on Vascular stiffness, systolic blood pressure, and AC component of the PPG signal (r = 0.991, p=< 0.001). Increases in the DC component of the PPG signal by >3% of baseline were associated with increased vascular stiffness and systolic blood pressure.
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