• Eur J Anaesthesiol Suppl · May 1997

    Review

    Monitoring depth of anaesthesia.

    • G Schneider and P S Sebel.
    • Department of Anesthesiology, Emory University School of Medicine, Atlanta, GA, USA.
    • Eur J Anaesthesiol Suppl. 1997 May 1;15:21-8.

    AbstractIn clinical practice, indirect and non-specific signs are used for monitoring anaesthetic adequacy. These include haemodynamic, respiratory, muscular and autonomic signs. These measures do not indicate adequacy of anaesthesia in a reliable manner. Many attempts have been made to find a more accurate monitor. Direct monitoring of anaesthetic effect should be possible by EEG measurement. EEG information can be reduced, condensed and simplified, leading to single numbers (spectral edge frequency and median frequency). These methods appear insufficient for assessing anaesthetic adequacy. The bispectral index, derived from bispectral analysis of the EEG, is a very promising tool for measuring adequacy of anaesthesia. An alternative approach is to monitor evoked potentials. Middle latency auditory evoked potentials may be helpful in assessing anaesthetic adequacy. Both techniques need further validation.

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