Anaesthesia
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Comparative Study
A bench study of ventilation via two self-assembled jet devices and the Oxygen Flow Modulator in simulated upper airway obstruction.
In managing an obstructed upper airway, an emergency transtracheal ventilation device needs to function as a bidirectional airway, allowing both insufflation of oxygen and egress of gas. The aim of the present study was to determine the capability of two self-assembled, three-way stopcock based jet devices and the Oxygen Flow Modulator to function as a bidirectional airway in conjunction with a small lumen catheter. For each device the effective pressures at the catheter's tip during the expiratory phase and the achievable minute volumes were determined in a laboratory set-up. ⋯ Yet this negative expiratory pressure did not facilitate the egress of gas. All devices tested impeded the expiratory outflow and hence decreased the achievable minute volume. This decrease in minute volume was smallest with the Oxygen Flow Modulator.
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There is little known about recyclable intensive care unit waste. We tested the hypotheses that the intensive care unit produces a small proportion (< 10%) of hospital waste, that much waste (> 30%) is recyclable and that there is little (< 10%) cross-contamination of non-infectious with infectious waste. For seven consecutive days in an Australian 10-bedded intensive care unit, we prospectively sorted all waste. ⋯ There were 0.4 kg of infectious cross-contamination in the 401 kg of general waste. Intensive care unit waste was a small proportion of all hospital waste. However, there was minimal infectious waste cross-contamination and almost 60% of intensive care unit general waste could be recycled with appropriate safeguards, education and training.
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Comparative Study
Risk of pulmonary aspiration with laryngeal mask airway and tracheal tube: analysis on 65 712 procedures with positive pressure ventilation.
We compared the risk of pulmonary aspiration in patients whose lungs were mechanically ventilated through a laryngeal mask airway (35 630 procedures) or tracheal tube (30 082 procedures). Three cases of pulmonary aspiration occurred with the laryngeal mask airway and seven with the tracheal tube. There were no deaths related to pulmonary aspiration. ⋯ The adjusted odds ratio (OR) for pulmonary aspiration with the laryngeal mask airway was 1.06 (95% CI 0.20-5.62). Unplanned surgery (OR 30.5, 95% CI 8.6-108.9) and male sex (OR 8.6, 95% CI 1.1-68) were associated with an increased risk of aspiration and age < 14 years with a reduced risk (OR 0.21, 95% CI 0.07-0.64). There were contraindications and exclusions to the use of the laryngeal mask airway but in this selected population the use of an laryngeal mask airway was not associated with an increased risk of pulmonary aspiration compared with a tracheal tube.
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Various movement disorders such as dystonia may acutely develop during or at emergence from general anaesthesia in patients with or without pre-existing Parkinson disease. These movements are triggered by a variety of drugs including propofol, sevoflurane, anti-emetics, antipsychotics and opioids. ⋯ Recent literature on the mechanisms of abnormal movements induced by opioids are discussed. The severity of the reaction with usual doses of opioids, in a patient with no prior history of parkinsonism, led to further investigation that demonstrated the possibility of an enhanced susceptibility to opioids, involving a genetically determined abnormal function of glycoproteine-P and catechol-O-methyltransferase.
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Ninety-three claims (total cost 4,915,450 pounds) filed under 'anaesthesia' in the NHS Litigation Authority database between 1995 and 2007, alleging patient harm directly by drug administration error or by an allergic reaction, were analysed. Alleged errors were categorised using systems employed by the National Coordinating Council for Medication Error Reporting and Prevention, the American Society of Anesthesiologists Closed Claims Project and the UK Health and Safety Executive. The severity of outcome in each claim was categorised using adapted National Patient Safety Agency definitions. ⋯ In 20 claims, the patient allegedly received a drug to which they were known to be allergic (total cost 130,794 pounds). All claims in which it was possible to categorise the nature of the error involved human error. Fewer than half the claims appeared likely to have been preventable by an 'ideal double checking process'.