Clinical correlation of bispectral index (BIS). Electroencephalographic (EEG) changes observed with increasing depth of anesthesia

Clinical correlation of bispectral index (BIS) (A). 
Electroencephalographic (EEG) changes observed with increasing depth of anesthesia (B).

(Adapted from Johansen JW, Sebel PS: Development and clinical application of electroencephalographic bispectrum monitoring. Anesthesiology 93:1336, 2000). (Redrawn From Kelley SD: Monitoring Level of Consciousness during Anesthesia and Sedation. Natick, MA, Aspect Medical Systems, 2003).