Methods Forty male SD rats were assigned into four groups:native group,sham operation group,CCI group and Ket(50 mg/kg intraperitoneally)group.

• 方法选择雄性SD大鼠40只,随机分为4组,分别为空白对照组,假手术组,CCI组和腹腔注射Ket 50 mg/kg治疗组。