The role of carbohydrate in the relief of perioperative anxiety and pain in children: a randomized controlled study

INTERVENTION: Pain control group:none;Carbohydrate preoperative treatment group (pain):Eat carbohydrates one hour before surgery;Carbohydrate postoperative treatment group(pain):Eat carbohydrates 1 hour after surgery;Anxiety control group:None;Carbohydrate preoperative treatment group (anxiety):Eat carbohydrates 1 hour before surgery;Carbohydrate postoperative treatment group (anxiety):Eat carbohydrates 1 hour after surgery;Carbohydrate preoperative and postoperative treatment group (anxiety):Carbohydrates were eaten 1 hour before and 1 hour after surgery; CONDITION: Perioperative pain and cognitive function PRIMARY OUTCOME: Level of anxiety;Pain scores;Stomach contents accumulation; SECONDARY OUTCOME: High;Weight; INCLUSION CRITERIA: Inclusion criteria. 1) Age of 6 to 12 years. 2) American Society of Anesthesiologists (ASA) classification class I. 3) absence of known cognitive dysfunction. 4) No abnormal liver or kidney function. 5) Ability to cooperate with the staff to complete all tests.