Ketamine Versus Dexmedetomidine as Adjuvants to Bupivacaine in Ultrasound Guided Bilateral Superficial Cervical Plexus Block in Thyroidectomy

The aim of this study is to compare the analgesic efficacy of Dexmedetomidine and Ketamine as adjuvants to Bupivacaine in ultrasound-guided Bilateral SCPB in patients undergoing thyroidectomy

Inclusion Criteria: * Patients aged more than 18 years * American Society of Anesthesiologists physical status I or II * scheduled for elective thyroid surgery will be included in the study. Exclusion Criteria: 1. Patients who refuse to participate in the study. 2. Patients presented with mental and memory dysfunction. 3. Patients with history of allergy to local anesthetics. 4. Patients with history of chronic use of pain killers )most days for more than 3 months). 5. Patients presented with skin or soft tissue infection at the proposed site of needle. 6. Pre-existing major organ dysfunction such as hepatic or renal impairment.