Group2 (G 2) inhaled O 2 (FiO 2= 0.40 )+40ppm NO; Group3 (G 3,n=24) inhaled O 2 (FiO 2= 0.40 )+80ppm NO; After 2,8,12 and 24 hours of the experiment,the specimen was examined.

• 吸氧组 (G1 )单纯吸氧 (FiO2 0 .；4 0 )；低浓度NO吸入组 (G2 )和高浓度NO吸入组(G3 )除吸氧外；分别吸入 4 0ppm和 80 ppm的NO；于 2、8、1 2、2 4h取标本检测 ;