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  • Title: Optimal timing for the administration of intranasal dexmedetomidine for premedication in children.
    Author: Yuen VM, Hui TW, Irwin MG, Yao TJ, Wong GL, Yuen MK.
    Journal: Anaesthesia; 2010 Sep; 65(9):922-9. PubMed ID: 20645951.
    Abstract:
    Previous studies have shown that 1 μg.kg(-1) intranasal dexmedetomidine produces significant sedation in children aged between 2 and 12 years. This investigation was designed to evaluate the onset time. One hundred children aged 1-12 years of ASA physical status 1-2 undergoing elective surgery were randomly allocated to five groups. Patients in groups A to D received intranasal dexmedetomidine 1 μg.kg(-1) . Patients in Group E received intranasal placebo (0.9% saline). Children from groups A, B, C, D and E had intravenous cannulation attempted at 30, 45, 60, 75 and 45 min respectively after intranasal drug or placebo administration. Vital signs, behaviour and sedation status of the children were assessed regularly until induction of anaesthesia. More children from groups A to D achieved satisfactory sedation at the time of cannulation when compared to group E (p < 0.001). The proportion of children who achieved satisfactory sedation was not significantly different among groups A to D. Overall 62% of the children who received intranasal dexmedetomidine had satisfactory sedation at the time of cannulation. The median (95% CI) time for onset of sedation was 25 (25-30) min. The median (95% CI) duration of sedation was 85 (55-100) min.
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