Hypoxemia Flashcards
1
Q
Alveolar-arterial oxygen gradient (normal)
A
10-20 mmHg
Age/4 + 4
2
Q
Causes of hypoxemia (5)
A
- Low inspired oxygen
- Alveolar hypoventilation
- Diffusion impairment
- V/Q mismatch
- Shunting
3
Q
Low inspired oxygen
A
normal A-a gradient
4
Q
Alveolar hypoventilation
A
normal A-a gradient
Hypercapnia
correct with supplemental oxygen
5
Q
Diffusion abnormalities
A
A-a normal at rest, may be elevated during exercise
rare observation
correct with supplemental oxygen
6
Q
V/Q mismatch
A
A-a gradient elevated
improve with supplemental oxygen
7
Q
Shunt
A
A_a gradient elevated
does not improve with supplemental oxygen
