Understanding PaO2 FiO2 Ratio: Not all PaO2's are the same!

Did you know that you can have a normal PaO2 and still be in severe respiratory failure? You can -- and this video will help you understand what the PaO2 and FiO2 represent and how this ratio can identify mild, moderate, or severe oxygenation impairment.

[poincareconjecture]

Oh wow you have just the right voice and delivery of a great instructors/professor/teacher well done:)...kept me listening

[aishafw]

Thank you so much! I just graduated as a doctor and no-one has ever taken time to explain this to me properly and i really struggled finding resources on it! Super helpful thank you!

[aminmottaghizade]

Finally someone "actually" explained these PaO2 and FiO2 .
Tnx Doctor 🙏🙏🙏

[Max-hifr]

PaO2 is the O2 partial pressure in the arterial blood, PAO2 (capital "A") is the partial pressure of O2 in the alveoli. I noticed you used the wrong one in the video and they are not equivalent (cf.the Aa gradient). Be careful it can get very confusing if you start switching them up!

[ibraheemalma]

I am not a nurse, still i am benefiting from this beautiful video.
Thank you. ☺

[Saezimmerman]

Thank you so much for an explanation clear enough for a lay person!

[lanced]

I wish I had your ad a professor when I was in nursing school Tx!!

[hatimho]

thanks a lot, ,, you’ve made so clear, ,, salute

[Yassin-Ghassan-Taha]

thank you very much, that was really helpful

[worldsokayestmedic]

"This is an alveoli." Actually, it's an alveolus (singular) :-) Otherwise, a much needed clarification for what is often poorly understood. What is needed is to integrate the amount (volume) of oxygen transport capacity, i.e. hemoglobin. An anemic/hemorrhagic patient will have the same PaO2 and SaO2 readings, but have a total reduction of oxygen volume. For example an SaO2 of .98 x 1.34 (coeff) x 15Hb = 19.7 mL O2/dL The same SaO2 of .98 x 1.34 x 7Hb = 9.2 mL O2/dL. Despite an unchanged PaO2 and SaO2, the oxygen volume is 50% less.