Bispectral index does not correlate with observer assessment of alertness and sedation scores during 0.5% bupivacaine epidural anesthesia with nitrous oxide sedation.

Abstract

The bispectral index (BIS) has been used as a measure of the degree of sedation and level of hypnosis for IV hypnotics and sedatives, potent volatile anesthetics. We evaluated the effect of increasing concentrations of nitrous oxide (N2O) on BIS and compared it with the Observer's Assessment of Alertness and Sedation (OAA/S) scale in patients undergoing… (More)

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