In this study the investigators aim to compare the effect of the suprascapular- supraclavicular nerve block in association with dexamethasone to that of the interscalene brachial plexus block on analgesic effect during arthroscopic shoulder surgery, as postoperative pain scores ,postoperative consumption of analgesic rescue medications and diaphragmatic excursion assessment.
ASA status 1,2.
Age 18 years or older
Elective shoulder arthroscopic surgery under general anesthesia and nerve block performed preoperatively.
• Patient refusal
Serious cardiac arrhythmias (including atrial fibrillation) or unstable coronary artery disease.
Use of drugs that act on the autonomic nervous system (including β- blockers).
Coagulation disorders..