00:01
Now, I love this picture.
00:02
Look at that. It's a little red blood cell, he's gonna get an oxygen mask on.
00:07
I think it's hilarious, but I do have a weird sense of humor.
00:10
But, look, he's hanging on to that oxygen tank for dear life.
00:14
Or remember, red blood cells job is to carry oxygen around to the rest of the cells, that's what they do.
00:21
They're not super smart but they are really efficient,
so when we're talking about FiO2, you know that second part of the PaO2/FiO2 ratio,
this represents the fraction of inspired oxygen.
00:34
It's the fraction concentration of the oxygen the patient is inspiring or breathing in.
00:41
Now room air, take a deep breath, okay take another one,
that's always a good thing particularly when you're studying
but room air is 21% and you may see that written as 0.21 or 21%
but that's roughly the fraction of inspired oxygen in room air, the average setting.
01:08
Now, FiO2 can range from 21% which is room air to 1.0 or 100%, so keep that in mind.
01:18
If I'm not -- if I don't have any extra oxygen on, like my little friend in the picture,
then I'm likely breathing 21%, but if I keep adding oxygen mask, cannulas, intubation,
I can increase the FiO2 to 100%.
01:33
Now, if I'm just standing here breathing an FiO2 of 21%, that means I'm doing okay.
01:40
My respiratory rate right now as you can see on video is normal.
01:43
I don't seem like I'm really working to breathe, so everything is relatively normal.
01:50
I'm right at 21%, I appear to be okay.
01:52
We could draw some lab work or do a pulse ox to validate that,
but pretty much, you know, I'm doing alright.
02:00
Room air is more than just that 21% oxygen and I wanted to make sure you knew that.
02:06
You think about, yeah, I know room air is 21%, but wait a minute, what's the rest of it?
Well, big old chunk of it is nitrogen, we also got carbon dioxide, argon, and some other stuff.
02:19
Depending on where you live, there might be some really weird other stuff,
but for the most part, I wanted you to have a visual picture,
it says room air, that's why we have the window open, is 21% oxygen.