This is a prospective, single-center, observational study. The inclusion period is set at 12 months.

Inclusion Criteria:

• Patient aged 18 years or older
• Patient informed about the study and who has not opposed the use of their personal medical data
• Patient scheduled for arthroscopic shoulder surgery

Exclusion Criteria:

• Allergy to local anesthetics or epinephrine
• Contraindications to Interscalene Block (e.g., respiratory disease, pneumothorax, pneumonectomy, phrenic or recurrent laryngeal nerve paralysis)
• Coagulation disorder
• Patients unable to understand the study information and objectives: dementia, psychosis, consciousness disorders, non-French-speaking patients
• Patients under legal protection measures (guardianship, curatorship) or deprived of liberty by judicial or administrative decision

population of patients undergoing shoulder surgery by arthroscopic approach under locoregional anesthesia combining an interscalene block and a superficial cervical plexus block (supraclavicular nerve)