What are the disadvantages of pulse oximetry for the diagnosis of status asthmaticus?

Updated: Jun 17, 2020
  • Author: Constantine K Saadeh, MD; Chief Editor: John J Oppenheimer, MD  more...
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Answer

The disadvantages of pulse oximetry are that movement artifact can be significant and the modality may provide an erroneous reading when pulsatile flow is inadequate (ie, shock with poor perfusion) or in the presence of anemia. Also, by the time desaturation occurs, there is significant reduction in oxygen and the use of a nebulized beta2 agonist can result in reduction in oxygen saturation secondary to increase in V/Q mismatch.


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