British Journal of Anaesthesia, Vol 82, Issue 2 203-207, Copyright © 1999 by The Board of Management and Trustees of the British Journal of Anaesthesia
M. Doi, R. J. Gajraj, H. Mantzaridis and GNC. Kenny
We have studied 46 patients to compare the efficacy of the auditory evoked
potential (AEP) index, bispectral index (BIS), 95% spectral edge frequency
(SEF) and median frequency (MF) in predicting movement in response to
insertion of the laryngeal mask airway (LMA). Anaesthesia was induced with
target-controlled infusions of propofol and alfentanil. After loss of
eyelash reflex and adequate jaw relaxation, the LMA was inserted without
the assistance of a laryngoscope or neuromuscular blocker. Patients who
showed any visible spontaneous muscle movement within 1 min of LMA
insertion were defined as movers. Values in movers and non-movers at 30 s
before LMA insertion were analysed. Only AEP index discriminated between
movers and non-movers with a prediction probability of 0.872. BIS, SEF and
MF could not predict movement at LMA insertion. AEP index was the most
reliable predictor of movement in response to LMA insertion.
CLINICAL INVESTIGATIONS
Prediction of movement at laryngeal mask airway insertion: comparison of auditory evoked potential index, bispectral index, spectral edge frequency and median frequency
Department of Anaesthesia, HCI International Medical Centre, Clydebank G81 4HX, UK; Department of Anaesthetics, Law Hospital, Carluke, Lanarkshire ML8 5ER, UK; University Department of Anaesthesia, Royal Infirmary, 8-16 Alexandra Parade, Glasgow G31 2ER, UK
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