What if you had the FiO2 and total flow between 2 gases but needed to find the individual flow of each gas ? I was trying to work it backwards but can’t figure it out !! Thanks !!
Say the flow of gas 1 is f1 and gas 2 is f2. Also say the fraction of o2 in gas 1 is x1 and in gas 2 is x2 (I.e. x of pure o2 would be 1 and of air would be 0.21) Say the total flow (which is known) is f_tot = f1 + f2 FiO2 = (f1*x1 + f2*x2) / f_tot So: FiO2 * f_tot = f1*x1 + f2*x2, with the left side being known in value You can then use f1 = f_tot - f2 and f2 = f_tot - f1 to get the right hand side to a single variable and solve it. For example for f1 it would be: FiO2 * f_tot = f1*x1 + (f_tot - f1)*x2 If you rearrange for f1 you get: f1 = (f_tot * (FiO2 - x2)) / (x1 - x2) Then you get f2 from f2 = f_tot - f1 Hope this helps!
You know sir, it's such an easy calculation when you're explaining it, but I couldn't figure it out for the life of me while standing at the head of the bed last week. Thanks a bunch for the video!
Very Helpful and far easier than what was explained in textbooks. Appreciate you!
This was very very helpful! Well explained. THANK YOU! Bring more calculations
What if you had the FiO2 and total flow between 2 gases but needed to find the individual flow of each gas ? I was trying to work it backwards but can’t figure it out !! Thanks !!
Say the flow of gas 1 is f1 and gas 2 is f2. Also say the fraction of o2 in gas 1 is x1 and in gas 2 is x2 (I.e. x of pure o2 would be 1 and of air would be 0.21)
Say the total flow (which is known) is f_tot = f1 + f2
FiO2 = (f1*x1 + f2*x2) / f_tot
So: FiO2 * f_tot = f1*x1 + f2*x2, with the left side being known in value
You can then use f1 = f_tot - f2 and f2 = f_tot - f1 to get the right hand side to a single variable and solve it.
For example for f1 it would be: FiO2 * f_tot = f1*x1 + (f_tot - f1)*x2
If you rearrange for f1 you get: f1 = (f_tot * (FiO2 - x2)) / (x1 - x2)
Then you get f2 from f2 = f_tot - f1
Hope this helps!
This is a much better explanation than Prodigy and Apex combined. THANK YOU
Thank you so much for the thorough explanation!
Thank you so much. Deeply Appreciated for helping me to understand the concept of FIO2.
You know sir, it's such an easy calculation when you're explaining it, but I couldn't figure it out for the life of me while standing at the head of the bed last week. Thanks a bunch for the video!
Where am I going wrong?
0.6 Air
0.6 Oxygen
I keep getting an FiO2 of 60% but my vent says 44%
What am I doing wrong?
Got me going in circles, round and around we go.
Why am I studying anesthesiology when I am an electrical engineer?
great explanation sir .
Thank u it was very helpful
Good explanation.
Thank you sir, well explation
Thank you👌👌
Thank you very much👍👍
thank you thank you thank you. Life saver :) !!
thanks a lot so simple
2lit oxygen- 2000ml/9000
you talk really slow, but thank you