Effect of transcutaneous acupoint electrical stimulation on hemodynamics and prognosis of patients undergoing lung cancer surgery

INTERVENTION: Trial group:transcutaneous acupoint electrical stimulation;control group:none; CONDITION: Hemodynamics and prognosis of patients undergoing lung cancer surgery PRIMARY OUTCOME: Catecholamine substance concentration;Blood gas analysis;Postoperative hospital stay;Hemodynamic index;Postoperative sleep score;Postoperative cognitive function score;Pain score;Postoperative ICU stay time; INCLUSION CRITERIA: 1) Patients undergoing lung cancer surgery 2) Age 18‐64 years old 3) BMI inde X18‐30kg/?; 4) American Society of Anesthesiology (ASA) score I‐II; 5) No radiotherapy or chemotherapy before surgery; 6) Patients who volunteered for the study;