Paediatric anaesthesia
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Paediatric anaesthesia · Sep 2007
Modeling the norketamine metabolite in children and the implications for analgesia.
Norketamine, a metabolite of ketamine, is an analgesic with a potency one-third that of ketamine. The aim of this study was to describe norketamine pharmacokinetics in children in order to predict time-concentration profiles for this metabolite after racemic ketamine single dose and infusion administration. The possible analgesic potential resulting from norketamine concentration may then be predicted using simulation. ⋯ Ketamine has a longer elimination half-life (2.1 h) than norketamine (1.13 h). Simulation suggested that norketamine contributes to analgesia for 4 h after 2 mg.kg(-1) i.v. bolus, provided the assumption that a norketamine concentration above 0.1 mg.l(-1) contributes analgesia is true. Similarly, the norketamine metabolite may contribute to analgesia for 1.5 h after low-dose infusion (0.2 mg.kg(-1).h(-1)) cessation.
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Paediatric anaesthesia · Sep 2007
Case ReportsA rapidly advancing mediastinal mass--overcoming tracheobronchial obstruction.
We report the case of a 7-year-old boy who presented with rapidly advancing airway obstruction secondary to mediastinal T-cell non-Hodgkins lymphoma. His brisk deterioration required transfer to the pediatric intensive care unit and intubation of the trachea. ⋯ We report the manufacture of a proximal 'Murphy's eye' which allowed ventilation of the contralateral lung to proceed. To the best of our knowledge this is the first time that this technique has been described in a pediatric patient.
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Paediatric anaesthesia · Sep 2007
ReviewWhen nitrous oxide is no laughing matter: nitrous oxide and pediatric anesthesia.
Although often felt to be relatively innocuous, nitrous oxide can have significant metabolic effects in settings of abnormal vitamin B12 and B12-related metabolism in children. These conditions can be genetic or environmental. ⋯ Although overt genetic diseases are relatively uncommon, the implications of nitrous oxide interactions with much more frequent but less symptomatically obvious single nucleotide polymorphisms are potentially more concerning. In addition, nitrous oxide can have direct and differing neurotoxic effects on both immature and aged brain, the clinical impact of which remains undetermined.
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Paediatric anaesthesia · Sep 2007
Dexmedetomidine for pediatric MRI sedation: a review of a series of cases.
The aim of this review was to determine whether dexmedetomidine alone provided satisfactory conditions for children undergoing magnetice resonance imaging (MRI). ⋯ The use of dexmedetomidine for MRI sedation by itself was more unpredictable than anticipated from the published case reports of its use.