Which of the following can cause hypoxemia? 1. Diffusion impairment 2. Alveolar hypoventilation 3. mismatch 4. Intrapulmonary shunting
a. 1, 2, and 3 only
b. 1, 3, and 4 only
c. 1, 2, 3, and 4
d. 2, 3, and 4 only
ANS: C
Hypoxemia can be caused by mismatch, shunt, alveolar hypoventilation, diffusion impairment, perfusion impairment, decreased inspired oxygen, and venous admixture.
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