Articles Isoproterenol-induced elevated bispectral indexes while undergoing radiofrequency ablation: A case report Robert Mathews, CRNA, MSNA The use of bispectral index (BIS) for monitoring neuronal function under general anesthesia has been expanding in practice; however, the meanings of the values are not always clear and have been shown to be altered by such drugs as ketamine, ephedrine, and p