Dexmedetomidine Versus Dexamethasone With Levobupivacaine in Interscalene Block

Inclusion Criteria: * Sixty healthy patients ASA I-II * Aged 18-60 years * Of both sexes * Scheduled for shoulder arthroscopy using ultrasound interscalene block were enrolled. Exclusion Criteria: * Patients with a history of any allergic reactions to levobupivacaine, dexamethasone or α2 agonists * All patients with hypertension, cardiac, hepatic, renal or pulmonary diseases, - Patients who were under treatment by α2 agonist or antagonists * Pregnant women * Psychiatric patients * Patients with a previous history or clinical evidence of central or peripheral neurological disease * Coagulopathy or anticoagulant/antiaggregant therapy * Contralateral phrenic nerve paresis * Patients who have an infection at the site of the block. * Every patient who had an anatomical or vascular abnormality in the upper extremity were excluded from this study.