Effect of transcranial direct current stimulation on perioperative anxiety status in patients with colorectal tumors

Interventions: experimental group:Patients in the experimental group were stimulated with transcranial direct current stimulation using anodal stimulation of the left dorsolateral prefrontal lobe and cathodal stimulation of the right dorsolateral prefrontal lobe, with a stimulation duration of 20 min and a stimulation current of 2 mA.;control group:In the control group, the stimulating electrodes were placed on the corresponding site, and the instrument was turned on to give a short climbing pseudo-stimulation for 30 s. After that, the instrument was turned off.
Primary outcome(s): Incidence of perioperative anxiety
Study Design: Parallel

干预措施：
实验组：实验组患者接受经颅直流电刺激（transcranial direct current stimulation），采用左侧背外侧前额叶阳极刺激（anodal stimulation）联合右侧背外侧前额叶阴极刺激（cathodal stimulation）的刺激方案，刺激时长为20分钟，刺激电流为2mA。
对照组：将刺激电极放置于对应部位，开启仪器后给予30秒的短暂爬坡型伪刺激（pseudo-stimulation），随后关闭仪器。
主要结局指标：围手术期焦虑（perioperative anxiety）发生率
研究设计：平行组设计