高浓度给氧为什么会造成肺不张？

Absorption atelectasis can be caused by exposure to high inspired fraction of oxygen (FiO2) levels.
When oxygen is absorbed from the alveolar gas into the capillary in distal occluded alveolar areas or wherethe ventilation perfusion ratio is low or high FiO2 levels are delivered, reabsorption of gas is
promoted and generates atelectasis.
这是文献里面的解释，其实可以想简单点，首先给高浓度氧的人一般是因为有基础疾病，多为肺部疾患，一般供氧满足不了需要，我们平时呼吸的空气里大部分是氮气是不被肺吸收的，而高浓度氧则不然，一旦患者因为肺部疾患通气不足，这时肺内高浓度氧会被吸收导致萎陷造成肺不张。