Figure 3From: Automatic noninvasive measurement of systolic blood pressure using photoplethysmographyThe curves of air pressure in the cuff (above) and the PPG signals, in the finger distal to the cuff (below) and in the contralateral finger (middle) as function of time. The PPG signal disappears for air pressure above the systolic blood pressure. Note the oscillometric air-pressure fluctuations in the air-pressure curve.Back to article page