手术准备阶段，病人取俯卧位，用药物使病人放松，颈部皮肤和组织局部麻醉。
In preparation for the procedure, you lie on your stomach. you are given medicine to make you feel relaxed. The skin and tissue of your neck is numbed.
假手术组仅切开颈部皮肤，暴露左侧颈总动脉。
The sham operation group was only given neck skin discission to expose the left carotid.
方法：假手术组仅切开颈部皮肤后缝合切口。
METHODS: in sham operation group, an incision was made on rats' cervical skin and sutured.
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