Pneumonia: Shunt vs V/Q mismatch

[DoctorMY]

In UW, one place they describe the hypoxemia and increase A-a gradient due to pneumonia as a shunt

then in another question explanation, they say that "alveolar and interstitial inflammation lead to hypoxia and V/Q mismatch manifesting as A-a gradient"

which is it? what am i missing?

thx in advance

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[turkeyjerky]

Both--the single alveolus model doesn't really work in real life.

 

[DoctorMY]

thx TJ. will keep that in mind

 

[theTruth_97]

so what if question describes a patient who has pneumonia and it asks whether supplementation of O2 will help increase O2 sat?- what would one answer since does that not depend on whether we are talking about V/Q mismatch or shunt?......or did i completely miss the point