The rabbits were randomly divided into three groups: sham operated group(sham,n=12),ischemia-reperfusion group(I/R,n=12) and I/R+ L-arginine group(L-Arg,n=12).

• 实验兔36只,随机分为假手术对照组(sham,12只)、肺缺血-再灌注组(I/R,12只)和肺缺血-再灌注加L-精氨酸组(L-Arg,12只)。