Unexpected behaviour of the bispectral index (BIS) after brain injury

摘要

As Grocott pointed out in his editorial, processed electroencephalogra-phy (EEG) monitors such as the bispectral index (BIS) are increasingly being used [1]. In response to this editorial we present two cases with BIS values that contradict the equation 'low BIS = less brain activity', highlighting that certain patients' characteristics may result in misleading BIS values, especially in the presence of low brain activity [2, 3].