Dexametasone Versus Dexametasone Plus Dexmedetomidine in Nerve Blocks

This study will compare perineural dexamethasone 2mg and perineural mixture of dexamethasone 2mg plus dexmedetomidine 50mcg DX plus DXD as adjuvants to local anesthetics for ultrasound-guided infraclavicular brachial plexus blocks (ICBs). The protocol is designed as a superiority trial and hypothesizes that the mixture of both drugs results in longer block duration. Furthermore, since analgesic and sensory duration can be influenced by the intake of pain medications and surgical trauma to small cutaneous nerves, respectively, motor block duration was selected as the main outcome to better target the action of both adjuvants on the brachial plexus.