Arterial PO2 is reduced in_____________?
Correct answer: B. Pulmonary hypoventilation
- A. Anemia
- B. Pulmonary hypoventilation
- C. KCN poisoning
- D. CO poisoning
Explanation
Pulmonary hypoventilation reduces the amount of fresh air reaching alveoli, causing alveolar and arterial PO2 to fall while PCO2 rises. Anaemia and carbon monoxide poisoning reduce oxygen content despite a normal or near-normal PO2, and KCN blocks tissue utilisation.
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