Figure 3 | Scientific Reports

Figure 3

From: Method-comparison study between a watch-like sensor and a cuff-based device for 24-h ambulatory blood pressure monitoring

Figure 3

Illustration of the PPG data processing approach, from signal segmentation to BP estimation. (a) Example of a 24-h baseline-corrected (highpass-filtered) PPG signal measured by the PulseWatch. (b) The corresponding 24-h first derivative of the acceleration Euclidian norm used for assessing the amount of motion. (c) The 24-h cuff-based BP profile of the patient. (d) 20-min segment surrounding a cuff measurement. (e) 20-s window used to obtain one BP estimate and one motion estimate. (f) From the BP estimates of all low-motion 20-s windows in the 20-min segment, one representative PPG-based BP value is estimated. PPG photoplethysmography, BP blood pressure, au arbitrary units.

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