Intro to Oxygen Content (CaO2) 

I can't comment on everything and this is the first time I'm commenting, but I do have to say your videos are amazing. you make it so easy to understand, you turn what seems complicating from the books and even some teachers into something much more understandable. THANK YOU SO MUCH. I just started mechanical ventilation class, this is the best time for me to watch your videos. I plan to watch all your lessons and best of all it's free. THANK YOU AGAIN. What an amazing teacher you are, I hope you keep it up, and I definitely will pass on your page to new students because it will help them like its helping me.

Ok this standard equation is clearly an approximation. There can be easily 30% difference in volume of blood depending on weight and height of an adult, which means corresponding change in dissolved oxygen at equal pressures. I mean on the one side you are accounting for blood volume by multiplying by total grams of hemoglobin, but on the dissolved side the 0.003 factor can only translate pressure to oxygen amount assuming some standardized amount of blood, like 5L. But since dissolved o2 only accounts for very little of the total (like 2%), the error isn't that significant. Just helps to understand what's going on, because you can't translate a pressure into amount with a constant multiplier if you don't have a fixed volume. But thanks for the explanation with what units we're talking about here otherwise the constants could mean anything.

Was really hoping you could have some figures and solve an example. Bummer...