Methods Forty SD rats were evenly assigned to fivegroups at random: control group(group N),asthma model group(group A),two pretreatment groups of different concentration of ketamine(group K1,K2) and dexamethasone group(group D).

• 方法SD大鼠随机分成对照组(N组)、哮喘模型组(A组)、不同浓度氯胺酮预处理组(分别为K1组、K2组)和地塞米松组(D组),每组8只。