Which of the following are causes of hypoxemia? 1. Ventilation/perfusion () mismatch 2. Alveolar hypoventilation 3. Diffusion impairment 4. Increased inspired O2
a. 1 and 2 only
b. 2 and 3 only
c. 1, 2, and 3 only
d. 1, 2, 3, and 4
ANS: C
The following are causes of hypoxemia: mismatch (most common cause), shunt, alveolar hypoventilation, diffusion impairment, perfusion/diffusion impairment (rare), decreased inspired oxygen, and venous admixture.
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