Effects of Transcranial Alternating Current Stimulation on Postoperative Anxiety in Patients Undergoing Intraspinal Tumor Resection

INTERVENTION: Sham tACS group:sham tACS;Transcranial Alternating Current Stimulation Group:Transcranial Alternating Current Stimulation; CONDITION: Postoperative Anxiety in Patients Undergoing Intraspinal Tumor Resection PRIMARY OUTCOME: Perioperative anxiety incidence; SECONDARY OUTCOME: Hospital Anxiety and Depression Scale‐Anxiety Scale Score;Fatigue, Resistance, Ambulation, Illness, Loss of weight Scale Score;Postoperative pain intensity assessed by Numeric Rating Scale score;Incidence of adverse events, complications, and 30‐day all‐cause mortality;Length of hospital stay;3‐Minute Diagnostic Interview for Confusion Assessment Method‐defined Delirium Score;Sleep quality assessed by Pittsburgh Sleep Quality Inde Xscore;Quality of recovery assessed by 15‐item Quality of Recovery score;Serum substance P concentration;Changes in Electroencephalographic Oscillations;Time to ambulation; INCLUSION CRITERIA: 1. Age 18‐65, any gender; 2. ASA classification I‐III; 3. Patients scheduled for elective intradural tumor removal surgery; 4. Right‐handed; 5. Signed informed consent.