Figure 1 | Scientific Reports

Figure 1

From: Features from the photoplethysmogram and the electrocardiogram for estimating changes in blood pressure

Figure 1

Overview of the fiducial points detected and some of the features extracted from the PPG waveform for one individual (Male, Age: 24, BMI: 25.1) during the four stages of the study protocol: (a) rest, (b) dose increase, (c) maximum infusion, and (d) washout. Examples of the following features are provided: Crest time (CT), \(\Delta\)T, reflection index (RI), width25, width50, slope transit time (STT), A1, A2, Gaussian estimation of the transit time of the reflected wave (Gauss RTT) and augmentation index (Gauss AI), slopeb-c and slopeb-d. Acronyms: S - Systolic peak, N - Dicrotic notch, D - Diastolic peak, a-e - waves of the APG.

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