The accurate determination of the systolic of blood pressure when measuring with PPG sensors can sometimes become a challenge because of weak and/or noisy signals. Some commercial systems, such as the Vasoguard, offer just a “truncated” PPG waveform display to help in “cleaning up” the display, but this presentation sometimes tends to be noisy or has the risk of missing some cycles.
The FALCON offers options to display the “truncated” PPG waveform as well, but also the standard un-modified PPG waveform. The combination of these displays helps in better locating the systolic pressure.
In addition, the FALCON provides an option also to display the DC PPG signal, which represents the average blood flow to the limb of interest. Thus, during limb occlusion the DC PPG signal will decrease, and the region where it starts to rise again indicates the systolic pressure (blood returning to the occluded limb).
Blood Pressure Measurement with PPG Sensor without
a DC signal and with a truncated display. The cyan line
is the decay curve of the pressure. Identified
systolic blood pressure is 102 mmHg.
Same Blood Pressure Measurement with PPG Sensor
with a DC signal (pinkish curve) and with a standard display.
A more accurate systolic pressure is 106 mmHg.