A Study to Learn About the Study Medicine - Precedex in Children From Japan.

"\<Sedation of non-invasive procedures and tests without intubation in pediatrics\> For children aged 2 years or older, the usual dosage of dexmedetomidine is 12 μg/kg/hr given as a continuous intravenous infusion over 10 minutes (initial loading dose) followed by a maintenance dose of 1.5 μg/kg/hr (maintenance dose).~For children aged 1 month to \< 2 years old, the usual dosage of dexmedetomidine is 9 μg/kg/hr given as a continuous intravenous infusion over 10 minutes (initial loading dose) followed by a maintenance dose of 1.5 μg/kg/hr (maintenance dose).~The infusion rate should be reduced according to patient's condition."