A 45-year-old man comes to the physician for a follow-up appointment. His arterial blood gases are shown:
Arterial pO2 95 mmHg
Arterial pCO2 40 mmHg
Arterial O2 content 12 vol% (NR 17-21%)
Which of the following is the most likely explanation for these findings?
Alveolar hypoventilation
High altitude residence
Methemoglobinemia
Mismatch of alveolar ventilation and pulmonary capillary perfusion
Voluntary hyperventilation
