PaO2/FiO2 ratio is the early and primary diagnosis of ARDS.Neutrophil-dependent or cytokine-associated endothelial and epithelial injury is the major pathogenesis of ARDS.

• 现在，急性呼吸窘迫综合症的早期诊断靠PaO2/FiO2比值，致病机理主要是中性粒细胞依赖的，或细胞因子相关的内皮和上皮细胞损伤。