Traditionally, general anesthesia followed by narcotics has been the primary management of pain control. However, regional anesthesia in the form of an interscalene block (ISB), a perineural local anesthetic infusion, is commonly used and may more effectively control pain during and after shoulder arthroplasty, with fewer side effects than narcotics. Intraoperative benefits include better control of blood pressure and reduced need for general anesthesia and narcotics. Depending on the type of block (single shot vs. continuous) and the type of local anesthetic administered, pain relief may persist for 12-96 hours postoperatively.