Effect of Bupivacaine Liposome Anterior Serratus Deep Block on Chronic Pain After Breast Cancer Surgery: a Randomized Controlled Study

Inclusion Criteria: * Adult patients (aged ≥18 years) who are scheduled to undergo unilateral modified radical breast cancer surgery Exclusion Criteria: * 1\. Patients with coagulation dysfunction 2. There are infected patients at the puncture site 3. For patients allergic to any trial drug 4. Patients who take painkillers within 48 hours before surgery 5. Severe cardiopulmonary insufficiency, such as EF\< 40%, FEVC \< 50% expected; Uncontrolled hypertension; 6. Refuse to perform nerve block puncture 7. Mental disorders, epilepsy history; 8. Unable to give informed consent or are participating in other clinical trials.