Abstract
Electroencephalogram (EEG) entropy is a widely used monitor of depth of anaesthesia. We present a series of two cases of frontal craniotomies in which entropy monitoring was unreliable due to wide fluctuations. Also, a small experiment was conducted to identify the effect of individual electrode displacement on entropy values. We conclude that caution should be exercised in interpreting frontal EEG derived indices of the depth of anaesthesia in frontal craniotomies.
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