Regional and Intravenous Dexamethasone in The Prophylaxis of Rebound Pain After Supraclavicular Block in Upper Limb Surgeries

Rebound pain is defined as "a transient acute increase in postoperative pain which occurs following resolution of a peripheral nerve block (PNB)" or as a phenomenon where a quantifiable difference is seen in the pain scores when the PNB is working compared to when its effect is resolved. The supraclavicular block is a regional anesthetic technique used as an alternative or adjunct to general anesthesia or used for postoperative pain control for upper extremity surgeries (mid-humerus through the hand). Dexamethasone, an adjunct used to prolong the duration of neural blockade when administered regionally or systemically, is thought to reduce pain sensitization by inhibiting sensory transmission of nociceptive C-fibers at the dorsal root ganglion and reducing prostaglandin synthesis, thereby suppressing hyperalgesia.