Low O2 saturation that does not respond to supplemental ...
704
Description

Low O2 saturation that does not respond to supplemental O2
- Key diagnostic feature (sat < 85% w/o response to 100% FiO2)
- Wavelength averaging by the pulse oximeter causes a falsely low O2 reading
- Since there is no true decrease in O2 saturation, there will be no response to 100% FiO2
Severity of symptoms correlates closely to MetHb level and severity of impaired O2 delivery
Symptoms will be worse for any MetHb level in patients with baseline impairment of O2 delivery (i.e. CHF, pneumonia, COPD, anemia)

#Diagnosis #Toxicology #Methemoglobinemia #Concentrations #Signs #Symptoms
Contributed by

Dr. Gerald Diaz
@GeraldMD
Board Certified Internal Medicine Hospitalist, GrepMed Editor in Chief πŸ‡΅πŸ‡­ πŸ‡ΊπŸ‡Έ - Sign up for an account to like, bookmark and upload images to contribute to our community platform. Follow us on IG:  https://www.instagram.com/grepmed/ | Twitter: https://twitter.com/grepmeded/
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