Intranasal Dexmedetomidine Versus Intranasal Midazolam as a Premedication in Pediatrics Undergoing Upper GI Endoscopy

Inclusion Criteria: * Children of preschool age (2-6 years old). * American scocity of anaesthesiology (ASA) I - II children. * Expected duration of the procedure is less than 50 minutes. Exclusion Criteria: * Cardiac arrhythmia, congenital heart disease, or hemodynamic or respiratory instability; children at risk for airway obstruction. * Behavioral, mental or developmental abnormality (example: mental retardation, Attention Deficit Hyperactivity Disorder "ADHD", Autism, Down syndrome). * Regular intake of either brain stimulant or depressive drugs (example: Methylphenidate, amphetamine-dextroamphetamine and diazepam respectively). * Parent's refusal. * Emergency case. * Allergy to any of the used drugs