Effect of Different Drugs on Emergency Delirium in Preschool Age Patient

patients will receive intravenous dexmedetomidine (0.25 μg/kg diluted with normal saline to a volume of 5 ml solution) 10 min before the end of the surgical procedure.

patients will receive intravenous ketamine (0.25mg/kg diluted with normal saline to a volume of 5 ml solution) 10 min before the end of the surgical procedure.

patients will receive intravenous midazolam (0.05 mg/kg diluted with normal saline to a volume of 5 ml solution) 10 min before the end of the surgical procedure.

patients will receive 5ml of normal saline intravenous10 min before the end of the surgical procedure as placebo.