Serratus Anterior Plane Block to Prevent Chronic Postoperative Pain in Breast Cancer

Inclusion Criteria: * Having an age greater than or equal to 18 years and less than 70 years * Having given written consent for participation in the study and the use of personal and medical data * Having a physical status of class I, II or III of the American Society of Anesthesiologists Exclusion Criteria: * Patients who expressed their refusal to participate in the study * Patients unable to express their non-objection to participation in the study * American Society of Anesthesiologists class \> III patients * Known allergy to local anesthetics * A contraindication to performing a peripheral nerve block (such as an acquired, constitutional or drug clotting disorder or infection at the nerve block injection site) * Morbid obesity (body mass index greater than 40 kg/m²) * Chronic use of opioids * Inability to use the patient controlled analgesia device * The existence of preoperative pain * History of neuropathy or neurological pathology * The existence of catastrophism or anxiety diagnosed preoperatively