The primary aim of this study is to identify potential anthropometric features that predict the relationship between the Interscalene Block procedure and changes in blood pressure

This prospective, randomized study will be carried out after obtaining the necessary ethical approval and informed consent from the patients. 110 adult volunteer patients who will undergo ISB for shoulder surgery anesthesia will be included in this study. Evaluation of the patients before ISB and anthropometric measurements before and after Interscalene Block will be performed by an anesthesiologist who is not involved in the study.

Inclusion Criteria:

• ASA I-III, elective shoulder surgery will be performed

Exclusion Criteria:

• Presence of advanced renal or hepatic insufficiency, serious respiratory or cardiovascular disease
• History of chronic opioid or benzodiazepine use
• Presence of allergy to the local anesthetic drugs used
• ISB contraindication (such as neurological disorder in the extremity to be operated on, diaphragmatic paralysis in the opposite region of the side where the intervention is planned, infection in the intervention area).
• Presence of high level anxiety
• Patients with a Hospital Anxiety and Depression Scale (HADS) cut-off score of 10 for the anxiety subscale and 7 or higher for the depression subscale

The participating study center will be Konya City Hospital and the research population will consist of volunteer patients who will undergo elective shoulder surgery under interscalene block.