Novel Application of a Multiscale Entropy Index as a Sensitive Tool for Detecting Subtle Vascular Abnormalities in the Aged and Diabetic
Figure 2
(a) Identification of the footpoint and peak of each arterial waveform measured from the wrist of a healthy young subject (group 1) using the air pressure sensing system (APSS), after connecting the baseline signals (5 min) to those at the hyperemic phase (9 min). (b) Plotting of the amplitudes from 1000 waveforms against time, giving a nonstationary curve. (c) Final curve after detrending using Empirical Mode Decomposition (EMD).
