The primary purpose of this study is to clarify the duration of pain control provided by supraclavicular blocks when supplemented with varying doses of the steroid anti-inflammatory dexamethasone when given through the intravenous line (IV). IV dexamethasone is commonly used for both nausea prevention and block prolongation, but a detailed study of the effect of varying doses of this medication on duration of pain relief and weakness from the block has not been studied. The study investigators seek to identify what association, if any, is noted between IV dexamethasone doses and changes in blood glucose levels after shoulder surgery with regional anesthesia and sedation. Finally, the study investigators will collect data on side-effects and postoperative complications, if any, in patients receiving a range of doses of IV dexamethasone.