Hypoxemia Flashcards
1
Q
Responsive vs refractory hypoxemia
A
responsive significantly improves with increase in FIO2
2
Q
causes of responsive hypoxemia (4). In which would the A-a gradient be elevated?
A
ambient hypoxemia, diffusion impairment (A-a elev), hypoventilation, venitaltion/perfusion inequality (A-a elev)
3
Q
causes of refractory hypoxemia
A
shunt (anatomic or capillary). Causes A-a elevation
4
Q
what is the P-F ratio
A
PaO2/FIO2
5
Q
what is the regulatory response to alveolar hypoxia (low v/q)? to hypocapnia (high v/q)?
A
arteriolar constriction, bronchoconstriction
6
Q
Sat is 50% when PO2 is___. 75%___. 97.5%___. 90%____.
A
27, 40, 100, 60
