Extension of Analgesia by Combined Injection of Dexamethasone and Dexmedetomidine After Arthroscopic Shoulder Surgery

This is an interventional, comparative, randomized, controlled study versus reference treatment, in 2 parallel groups, double blind (patient and evaluator), multicenter, aiming to demonstrate the superiority of This is an interventional, comparative, randomized, controlled study versus reference treatment, in 2 parallel groups, double blind (patient and evaluator), multicenter, aiming to demonstrate the superiority of Dexmedetomidine over the absence of Dexmedetomidine, in adjuvantation of a loco regional anesthesia (interscalenic bloc of the brachial plexus + intravenous injection of Dexamethasone), on the prolongation of the analgesia, following a surgery of the rotator cuff of the shoulder under arthroscopy.

Patients will be randomized into 2 groups according to the treatment received:

• Dexmedetomidine;
• Nothing (control arm). The investigator (anesthesiologist) who will perform the randomization will not be blinded to the treatment.

Inclusion criteria

• Age ≥ 18 years;
• Patient undergoing arthroscopic shoulder surgery to repair the rotator cuff tendons;
• Patient capable of understanding the information related to the study, of reading the information leaflet and agreeing to sign the consent form.

Exclusion criteria

• Patient on oral morphines before surgery;
• Contraindication to performing a general anesthesia associated with a shoulder loco regional anesthesia in a single injection;
• Contraindication to take oral morphines;
• Any non-arthroscopic repair (intraoperative conversion to "open sky" technique);
• Any other loco regional anesthesia than an interscalenic block (change of intraoperative strategy);
• Pregnant or lactating woman;
• Intolerance or allergy or contraindication to one of the treatments under study;
• Patient participating in another clinical trial, or in a period of exclusion from another clinical trial.