A comparison of the insertion characteristics of the laryngeal tube and the laryngeal mask airway: A study of the ED50 propofol requirements

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Abstract

The purpose of this prospective randomised double-blind study was to determine the effective dose of propofol required for the successful first attempt insertion of the laryngeal tube compared with the laryngeal mask airway in patients co-induced using alfentanil 5 μg.kg-1, undergoing short elective gynaecological procedures. The first patient in each group received propofol 2.5 mg.kg-1 for induction. In accordance with Dixon's up-and-down method, the dose of propofol for consecutive patients in each group was varied with increments or decrements of 0.5 mg.kg-1 based on the previous patient 'all-or-none' purposeful movement response to first attempt of insertion of the randomised device. The ED50 (SD) of propofol was 2.66 (0.86) mg.kg-1 and 2.33 (0.37) mg.kg-1 for the laryngeal tube and laryngeal mask patients, respectively, which did not reach statistical significance (p = 0.40). We conclude therefore that the insertion of the two airway devices requires similar bolus doses of propofol when alfentanil is used as the co-induction drug. © 2006 The Authors Journal compilation The Association of Anaesthetists of Great Britain and Ireland.

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Burlacu, C. L., Gaskin, P., Fernandes, A., Carey, M., & Briggs, L. (2006). A comparison of the insertion characteristics of the laryngeal tube and the laryngeal mask airway: A study of the ED50 propofol requirements. Anaesthesia, 61(3), 229–233. https://doi.org/10.1111/j.1365-2044.2005.04442.x

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