USMLE Step 1: How to solve V/Q mismatch questions, the A-a gradient

V/Q mismatch USMLE Step 1 up and down arrows.
Hey guys, in this video I'll show you an easy way to think about V/Q mismatch questions that have those up and down arrows. You have to understand that an A-a gradient is a representative metric of a mismatch between ventilation and perfusion; V/Q mismatch. Keep watching to learn more!

[thegryffindoctor]

Thank you so much- you literally explained most of resp physio in such a short video!

[solomonmpalanyi]

Am speechless whatever u touch turns into gold. Best explanation ever for this crap! Now I get it. Thanks lots Noor, and keep up the good work. You deserve an award in my opinion! Now I see why u had a 265, it’s the extra brain u got that most people lack!

[drzainabtahir]

Uff.... Finally understood this topic.... Thanks

[rubaalqudah]

Best explanation! thank you very much for sharing this.

[virajpanchal]

Hey, can you make another video explaining the changes of PaO2, SaO2 and HbO2 with CO and Meth hb? This video is great !

[jorgemd]

High Yield video! Thank you very much for all the great content! I have a question, Dr. Ryan says that in hypoxemia with a High A-a gradient there is no increase in CO2, how is that possible?

[MsEsyC]

Can you do a similar video explaining the pathophysiology of the heart and major concept in cardiac physiology, especially pediatric Congenital conditions like tetralogy of Fallot, tricuspid atresia, VSD/ASD etc.? 😮

[wingsnotstrings]

What’s your concept for the difference between A-a gradient and VQ ratio ? Because if I listen to only the first 2 mins of this video it looks like they’re both the same

[octaviablink]

Very good video, thank you! May I ask what type of V/Q mismatch we would see in a patient with late stages of COPD? Would we have both increased/decreased and shunt?

[Besmaht]

What about atelectasis and can you explain DLCO

[mahmoudhadhoud]

Does pnemonia cause a shunt or a vq mismatch?