Anaesthesia
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Randomized Controlled Trial Comparative Study Clinical Trial Controlled Clinical Trial
Evaluation of five oxygen delivery devices in spontaneously breathing subjects by oxygraphy.
Oxygen supply systems may be divided into constant and variable performance systems. As the variable performance systems are widely used, it is relevant to investigate the variation in performance between devices and the influence of oxygen supply on the inspired oxygen fraction. Data were collected from 10 healthy volunteers during the use of one constant performance system and four variable performance systems at different gas flows and inspired oxygen fractions. ⋯ With the variable performance systems, inspired oxygen fraction varied considerably between subjects whereas a constant and equal rise was found for each subject with the fixed performance system. A large nasal catheter was capable of delivering the highest inspired oxygen fraction, whereas the Venturi mask delivered the most precise inspired oxygen fraction. We found oxygraphy useful in the interpretation of measurements made in patients receiving unknown inspired fractions of oxygen.
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Comment Letter Comparative Study
Comparative trial of spinal needles for caesarean section.
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Letter Case Reports
Awareness during total intravenous anaesthesia with propofol and remifentanil.
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Two hundred patients completed a questionnaire about their experiences of patient-controlled analgesia. The questionnaire covered the following topics: pre-operative information, reasons for pressing and not pressing the button, pain relief, side-effects, safety, advantages and disadvantages of patient-controlled analgesia, worries associated with its use and control over pain. ⋯ However, more detailed questions revealed side-effects and fears that constrained its use and hence patients' ability to control pain. Control is predominantly a feature of the professional's view of patient-controlled analgesia, rather than the patient's experience of this analgesic technique.