Respiratory Monitoring - An Introduction to Pulse Ox and Capnography

Respiratory Monitoring - An Introduction to Pulse Ox and Capnography

First a bit of physics....

Both pulse oximetry and capnometry rely on the Beer-Lambert Law. 

  • In 1760, Johann Heinreich Lambert proved that the absorbance of light through a material is proportional to the thickness of the material.  
  • In 1852, August Beer proved that the absorbance of light through a material is proportional to the concentration of the attenuating substance in the material.
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