Inclusion Criteria:  ASA I or II. Age group: 4-12 years old. The procedure expected to be completed within 1 hour.  Exclusion Criteria:  Patients with expected difficult airway management. lack of consent. known adverse effects to dexmedetomidine. Mental retardation developmental delay, or neurological or psychiatric illness that may associate with agitation (cerebral palsy, seizure..etc.) Hemodynamically unstable patients. Persistent cough or high airway secretions. Clinical signs of active infectious disease. Coagulopathy (INR >1.5). Obesity (BMI >30 Kg/m2 ). Surgical complication