起初动脉的氧合可能是正常的，也可能出现轻微的低碳酸血症，随着阻塞的加重，病人则出现典型的低氧血症和高碳酸血症。

Whereas initially arterial oxygenation may be normal and slight hypocapnia may be present, worsening obstruction and tiring patients may exemplify arterial hypoxemia and hypercapnia.

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起初动脉的氧合可能是正常的，也可能出现轻微的低碳酸血症，随着阻塞的加重，病人则出现典型的低氧血症和高碳酸血症。

Whereas initially arterial oxygenation may be normal and slight hypocapnia may be present, worsening obstruction and tiring patients may exemplify arterial hypoxemia and hypercapnia.

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