This trapped CO2 in the lungs also makes it harder for CO2 to get out of the bloodstream, which also explains the hypercapnia.

肺中二氧化碳潴留，使二氧化碳更难脱离血液，导致高碳酸血症。

People with chronic bronchitis also often present with hypoxemia, low oxygen in the blood, and hypercapnia, increased carbon dioxide in the blood.

慢支患者经常合并有低氧血症，即血中氧气含量低，以及高碳酸血症，即血中二氧化碳含量高。

Carbon dioxide levels increase when metabolism increases; therefore, hypercapnia is a good measure of metabolic activity.

当新陈代谢增加时，二氧化碳含量增加； 因此，高碳酸血症是代谢活动的良好指标。

This causes the carbon dioxide levels to rise back to normal levels and then, as the apnea persists, they keep rising to which is called hypercapnia.

这会让二氧化碳浓度回到正常范围，随着呼吸暂停持续，二氧化碳浓度持续升高，引发高碳酸血症。