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Photo-plethysmography Readings

The Photo-plethysmograph (PPG) test detects changes in segmental blood volume, in a similar manner to the Pulse Volume Recording (PVR) test. The PPG technology, however, is different than the pressure-sensor based PVR technology.

With PPG, infra-red signals are transmitted to the skin and reflected back to the sensor, therefore PPG waveforms reflect local and rather shallow skin variations in blood flow.

  PPG Sensors manufactured by Viasonix

Typical PPG measurement sites are the toes and digits, and interpretation of the signals is in a similar manner to the interpretation of the PVR waveforms.

Below is an example of a PPG waveform measured using Viasonix FALCON/Pro. The dicrotic notch is clearly visible on the waveform.

 
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