Unbelievable! Thank you so much :):) If you are wondering why supplemental oxygen works in V/Q mismatch but doesn't in shunts (which is an extreme V/Q mismatch where there is ZERO perfusion)... The reason is: in shunts, there is very low perfusion of alveoli (almost zero) so no matter how high is the alveolar O2, it will never get into your body (and you will stay hypoxemic). However, in V/Q mismatch there is still some degree of perfusion to the alveoli (although not optimal, hence "mismatch") but increasing the alveolar O2 will increase the chances O2 will get into your system therefore can correct hypoxemia!! I hope that made sense. Good luck!! :)
Exactly thats what I still dont get...why is O2 diffusion negatively affected but Co2 Diffusion not affected? doesnt Co2 have to diffuse out? and if there is fibrosis it will be harder for it to come out?
If Oxygen is inspired only when CO2 is eliminated, that is, when the blood passes through the lung capillaries, why would any condition affecting your ability to inspire Oxygen, like an anatomic shunt reducing PaO2, not automatically affect your ability to expire CO2 and reflexively increase PaCO2 as well?
![Quando Rondo - Grow Up [Official Music Video]](http://i.ytimg.com/vi/8zFnCg3BO4Q/mqdefault.jpg)
Unbelievable! Thank you so much :):)
If you are wondering why supplemental oxygen works in V/Q mismatch but doesn't in shunts (which is an extreme V/Q mismatch where there is ZERO perfusion)...
The reason is: in shunts, there is very low perfusion of alveoli (almost zero) so no matter how high is the alveolar O2, it will never get into your body (and you will stay hypoxemic). However, in V/Q mismatch there is still some degree of perfusion to the alveoli (although not optimal, hence "mismatch") but increasing the alveolar O2 will increase the chances O2 will get into your system therefore can correct hypoxemia!!
I hope that made sense. Good luck!! :)
Took me months to finally find an excellent explanation of this concept. Thank you. Liked & Shared.
do a video on fluids like maintenance fluids, how much to give when there is a deficit, the 4,2,1 rule or the 100, 50, 25 rule or whatever it is.
Good morning do you have web site to folow up your lecture one by one
Thanks!!!! I finally get it!!
Exactly thats what I still dont get...why is O2 diffusion negatively affected but Co2 Diffusion not affected? doesnt Co2 have to diffuse out? and if there is fibrosis it will be harder for it to come out?
Ahh, thanks!
If Oxygen is inspired only when CO2 is eliminated, that is, when the blood passes through the lung capillaries, why would any condition affecting your ability to inspire Oxygen, like an anatomic shunt reducing PaO2, not automatically affect your ability to expire CO2 and reflexively increase PaCO2 as well?