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A similar BIS value does not mean a similar depth of anaesthesia
Hull, UK
E-mail: i.f.russell@hull.ac.uk
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Editor—The recent editorial1 and accompanying two studies2 3 provide more intriguing information as regards the complex nature of general anaesthesia. However, there are two aspects of the terminology used within the papers which I believe have the potential to cause confusion.
First, there is the suggestion that equi-anaesthetic concentrations of a drug can be defined by the same bispectral index (BIS) value. I have no concerns if an author's methodology describes titrating anaesthetic drugs to a particular BIS value, but authors should not believe
Nijmegen, The Netherlands
* E-mail: j.mourisse@anes.umcn.nl