A study of liposomal bupivacaine serratus anterior plane block for improving recovery after breast cancer surgery

INTERVENTION: Liposomal bupivacaine group:Serratus anterior plane block with liposomal bupivacaine combined with conventional bupivacaine;Conventional bupivacaine group:Serratus anterior plane block with conventional bupivacaine; CONDITION: Breast cancer PRIMARY OUTCOME: QoR‐15 score at 24 hours after surgery; SECONDARY OUTCOME: QoR‐15 score at 48 hours after surgery;Perioperative adverse events;VAS pain scores at rest and during movement after surgery;Length of hospital stay;Time to first patient‐controlled analgesia demand;Perioperative opioid consumption;Opioid‐related adverse events; INCLUSION CRITERIA: 1. Age: 18 ‐ 65 years old; 2. BMI: 18 ‐ 25 kg/m^2; 3. ASA classification: Grade I or II; 4. Adheres to the indications for modified radical mastectomy for unilateral breast cancer; 5. Obtained the consent of the patient and their family and signed the informed consent form.