This study sought to characterize the effects of 3070% nitrous oxide and 0.2-0.8% sevoflurane conscious sedation on quantitative electroencephalographic (EEG) readings as measured by the bispectral index (BIS). BIS is a processed parameter (algorithm) made available in 1997 by Aspect Medical Systems (Newton, Mass). As depicted in Figure 1, it is specifically designed to correlate [...]