Evoked responses in anaesthesia

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Abstract
Evoked responses are derived from the electro- encephalogram (EEG) in response to auditory, somatosensory, nociceptive and visual stimuli. These evoked responses are obvious candidates for investi- gation as they reflect the functional integrity of specific peripheral and central nervous system (CNS) regions in humans. The changes that occur in the evoked responses allow anaesthetists to assess the effects of the drugs that they are administering on the target site, namely the brain, in vivo. Consequently, interest in evoked response monitoring in the three speciality areas of clinical anaesthesia (general anaes- thesia, intensive care and pain assessment), has increased considerably in the past 10-15 yr. This review explores the potential usefulness of evoked responses in fulfilling these aims, based on an under- standing of the research in these areas.

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