In this study, the effect of paresthesia occurring during the interscalene block procedure on the incidence of postoperative neurological symptoms will be investigated. Paresthesia is defined as an abnormal sensation described as tingling, pinprick, severe pain, or an electric feeling in the arm. The status of postoperative neurological symptoms in patients at the end of the block's effective duration will be assessed through phone interviews, evaluating symptoms such as arm numbness, tingling, abnormal sensations, pain, and weakness.