低氧血症的主要原因之一是肺泡弥漫性肺不张~([1]),可以通过扩张肺泡从而减少肺内分流和静脉混合以提高氧合指数~([2])。因此肺复张策略可以通过短时间增加胸内压和保持肺泡开放的滴定呼气末正压(PEEP)水平使萎陷的肺单元完全复张~([3])。该策略在理论上可以最大程度地减少肺泡的异质性,减少呼吸机相关性肺损伤,并已成为一些保护性通气 One of the major causes of hypoxemia is diffuse atelectasis of the alveoli ([1]), which can increase the oxygenation index by expanding the alveoli to reduce pulmonary shunting and venous mixing (2). Therefore, the strategy of pulmonary reclaim can make the collapsed lung units fully recaptured by increasing intrathoracic pressure for short periods of time and titrating positive end-expiratory pressure (PEEP) to keep the alveoli open (3). This strategy theoretically minimizes alveolar heterogeneity and reduces ventilator-associated lung injury and has become a protective ventilator