Fig. 1From: Measurement of area difference ratio of Photoplethysmographic pulse wave in patients with pre-eclampsiaA representive beat of pulse photoplethysmographic waveform. Baseline is corrected to 0. Point A, P and B are the onset, peak and end position of pulse, respectively. Point O is the vertical projection of point P on the baseline. PPG signal (ā) is shown with PPG magnitude in arbitrary units (au)Back to article page