1急性肺损伤急性肺损伤(acutelunginjury,ALI)是一种综合征,其特点是低氧血症,肺僵硬和肺浸润等。其定义为急性发病,胸片有肺浸润,PaO2/FiO2(P/F)≤300mmHg,以及肺动脉压≤18mmHg或无左房压升高等。急性呼吸窘迫综合征(ARDS)是ALI最严重的形式,其定义是P/F≤200mmHg。ALI一般先 Acute lung injury Acute lung injury (ALI) is a syndrome characterized by hypoxemia, pulmonary stiffness and pulmonary infiltrates. It was defined as an acute onset of chest radiograph with pulmonary infiltrates with PaO2 / FiO2 (P / F) ≤300 mmHg and pulmonary arterial pressure ≤18 mmHg or no increase in left atrial pressure. Acute respiratory distress syndrome (ARDS) is the most severe form of ALI, which is defined as P / F ≤ 200 mmHg. ALI generally first