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Comparison of the effects of the laryngeal mask airway and endotracheal intubation on vocal function



Comparison of the effects of the laryngeal mask airway and endotracheal intubation on vocal function



British Journal of Anaesthesia 71(5): 648-650



We have compared changes in vocal function produced after insertion of a laryngeal mask airway (LMA) with those produced by tracheal intubation in 20 patients. Using acoustic waveform analysis, we computed amplitude variability (A V), pitch variability (PV), harmonics-to-noise ratio (HNR) and additive noise level (ANL) before anaesthesia and at 1, 4, and 24 h after tracheal extubation. There were no significant changes in vocal function after extubation except for HNR ratio (P = 0.046) at 4 h in the LMA group. There were differences in all four variables at 1 h, 4 h, or both, after tracheal extubation compared with baseline in the tracheal tube group. In both groups, all variables were the same as baseline values 24 h after extubation. We observed significant differences in A V (4 h), PV and ANL (1, 4 h) values between the two groups. These observations suggest that the LMA causes less vocal change than tracheal intubation.

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Accession: 008362493

Download citation: RISBibTeXText

PMID: 8251272

DOI: 10.1093/bja/71.5.648


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