pulm labs etc

Question 1

normal A-a gradient

Answer 1

5-15 mmHg, older ppl a little higher

Question 2

etiologies of hyoxemia in the setting of a normal A-a gradient

Answer 2

hypoventilation (obesity hypo v syndrome), neuromuscular disorders

low inspired fraction O2 (high altitude)

Question 3

hypoxemia in the setting of a elevated A-a

Answer 3

R-L-Shunts, Impaired diffusion, V/Q mismatches