Synergistic Effect of Perineural Dexamethasone and Dexmedetomidine (Dex-Dex) Prolong Analgesic Effect of a Preoperative Interscalene Block.

The brachial plexus is often a target of regional anesthesia for procedures involving the upper extremities. These include the supraclavicular, infraclavicular, interscalene, and axillary blocks. The cases we present involve the use of an ultrasound-guided interscalene block using 20 mL 0.2% ropivacaine with dexamethasone and 25 mcg dexmedetomidine as the injectate. This particular block technique has proven to be a very useful adjunct to the perioperative anesthetic care and enhanced recovery after surgery (ERAS) protocol for these patients. The series of cases we present include patients receiving the dexamethasone and dexmedetomidine (Dex-Dex) combination in their local anesthetic injectate for the ultrasound-guided interscalene block. Two of the patients underwent arthroscopic shoulder procedures and one underwent a shoulder total arthroplasty with biceps tenodesis. None of the patients required any postoperative opioids for analgesia. Though the technique is fairly new, with only a limited number of case studies described its efficacy, the understanding of the benefits of ERAS has helped it gain some traction in the field of regional anesthesia. Conduction of further large clinical trials is the next step in providing a better understanding of the Dex-Dex adjuvant method as it moves towards becoming a commonly used component of ERAS protocols in the perioperative period.