The effect of acupuncture pre-treatment on postoperative pain in parturients undergoing cesarean section

INTERVENTION: Control:No needle intervention;Acupuncture pre‐treatment group:Acupuncture pre‐treatment; CONDITION: Although selective cesarean section can avoid labor pain and provide controlled delivery time, it does carry clear risks for the respiratory system development and long‐term health of the newborn, and also increases surgical‐related complications and long‐term pregnancy risks for the mother. PRIMARY OUTCOME: The incidence rate of moderate to severe pain; SECONDARY OUTCOME: pain score;Postoperative recovery quality;Sleep Quality;The dosage of opioid drugs;adverse reaction; INCLUSION CRITERIA: 1.Age: 18‐40 years old, single pregnancy, gestational age 37‐42 weeks (confirmed by ultrasound); 2.Scheduled for elective cesarean section through a trans‐abdominal incision; 3.Anesthesia method: combined spinal‐epidural anesthesia; 4.American Society of Anesthesiologists (ASA) classification: I‐II; 5.Cognitive function is normal, and the patient and her family have given informed consent and signed a written informed consent form; 6.Agree to use the PCIA device for postoperative pain relief.