Current opinion in anaesthesiology
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Curr Opin Anaesthesiol · Jun 2009
ReviewEffect of head posture on pediatric oropharyngeal structures: implications for airway management in infants and children.
Although head and neck posture has direct effects on the upper airway in infants and children, many of these effects remain unclear or not well established. As airway patency and airway access are critical in sedated and/or unconscious children, recent developments in this area should be made known to pediatric anesthesiologists, intensive care physicians and other emergency caregivers. ⋯ The site of obstruction of the airway in sedated children in different postures is now more clear. Implications of head flexion and extension in intubated children have been extensively studied, and clinical consequences have been detailed. Due to large interindividual anatomic variability, depth marks set on the tubes by their manufacturers and guidelines regarding calculations of insertion depth should be made with caution in infants and neonates. Despite several studies, there is still little scientific evidence regarding proper head posture for laryngoscopy and intubation.
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General anesthetics and sedatives are used in millions of children every year to facilitate surgical procedures, imaging studies, and sedation in operating rooms, radiology suites, emergency departments, and ICUs. Mounting evidence from animal studies suggests that prolonged exposure to these compounds may induce widespread neuronal cell death and neurological sequelae, seriously questioning the safety of pediatric anesthesia. This review presents recent developments in this rapidly emerging field. ⋯ Neurodegeneration following exposure to anesthetics and sedatives has been clearly established in developing animals. However, while some of the biochemical pathways have been revealed, the phenomenon's particular molecular mechanisms remain unclear. As the phenomenon is difficult to study in humans, clinical evidence is still scarce and amounts to associative and not causal relationships. Owing to the lack of alternative anesthetics, further animal studies into the mechanism as well as clinical studies defining human susceptibility are both urgently needed.
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The most recent findings on preeclampsia with a focus on maternal mortality, haemodynamic changes, clotting disorders and anaesthesia are reviewed. ⋯ Cerebral haemorrhage is the major cause of maternal mortality in preeclampsia and any increases in maternal blood pressure above 160 mmHg or at induction of general anaesthesia should be treated. Traditional rapid sequence induction is, therefore, best avoided; neuraxial anaesthesia is the technique of choice.
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This review examines the literature on the ability of an epidural test dose to detect intravascular or intrathecal epidural catheter misplacement in the obstetric patient. ⋯ Gentle aspiration followed by an appropriate test dose, in epidural anesthesia for cesarean section, and careful observation of the patients in epidural labor analgesia increase the likelihood that an incorrectly placed catheter will be detected and that a harmful reaction to local anesthetics will be avoided.
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We describe the different possible anaesthetic techniques for an emergency caesarean section. To choose the right method of anaesthesia may have major implications for mother, child and all involved personnel. The major controversy is whether one have other or better alternatives or both than general anaesthesia, with a rapid sequence induction technique, when the foetus is compromised. ⋯ Regional anaesthesia techniques such as a single-shot spinal or a top-up of a well functioning labour epidural analgesia are good alternatives to general anaesthesia in an emergency caesarean setting.