Photoplethysmography

We are interested in the waveforms.

  1. Pulsatile physiological waveform (AC, ~1Hz): cardiac synchronous changes
  2. Slow varying baseline (DC): respiration, sympathetic nervous system activity, thermoregulation

The important factors are

  1. the blood volume,
  2. blood vessel wall movement,
  3. the orientation of red blood cells (RBC).
  4. Obsorptions:[Allen2007]
    1. Optical water window: Absorbs ultraviolet and infrared; melanin also absorbes shorter wavelengths.
    2. Isobestic wavelength:
    3. Tissue penetration depth:
  5. Multi-bilateral site photoplethysmography

Pulse Wave

  1. Pulse distortions and alterations at periphery
  2. Damage and disease in the vascular

References and Notes

[Allen2007]Allen, J. (2007). Photoplethysmography and its application in clinical physiological measurement. Physiological Measurement, 28(3), 0–39.
  1. ECG: electrocardiogram

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