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British Journal of Anaesthesia, 2004, Vol. 93, No. 1 150-152
© 2004 The Board of Management and Trustees of the British Journal of Anaesthesia

Correspondence

Spectral entropy—what has it to do with anaesthesia, and the EEG?

V. Jäntti1, S. Alahuhta1, J. Barnard2 and J. W. Sleigh2

1 Oulu, Finland 2 Hamilton, New Zealand

The first 150 words of the full text of this article appear below.

Editor—In a recent issue, Sleigh and Barnard1 discuss the properties of the spectral entropy index monitor, and why it fails to recognize unconsciousness in nitrous oxide anaesthesia. This finding is no surprise to any neurophysiologist who has experience of the neurophysiology of unconscious patients. A discussion on what this index really represents is therefore necessary.

Neurophysiologists have known for >50 yr the typical patterns of the EEG during anaesthesia, including the topographic features and reactivity, as well as differences in EEG patterns between different drugs. The same sequence of events is seen in several metabolic disorders and intoxications. After diffuse ischaemic brain damage the same pattern is seen in the order of recovery: suppression, burst suppression, slow activity, and then a normal EEG. This sequence is generated by pathophysiological events inside the brain, without the contribution of drugs or a metabolic disorder. But there are also many other causes of . . . [Full Text of this Article]


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