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. Author manuscript; available in PMC: 2013 Mar 1.

Published in final edited form as: Anesth Analg. 2012 Jan 17;114(3):533–546. doi: 10.1213/ANE.0b013e31823ee030

Examples of raw frontal electroencephalographic (EEG) traces with concurrent Bispectral Index (BIS) values. A, electrocardiographic (ECG) artifact is evident with persistently suppressed EEG trace. The BIS value is appropriately very low despite the ECG artifact. B, Slow delta waves and spindles are seen at four different EEG sweep speeds. The BIS value is 40, which is congruent with the raw EEG trace. C, Ventricular fibrillation artifact is present on the EEG trace. The underlying EEG rhythm is persistent suppression. The BIS value should be very low, but instead is showing 40. D, This patient has a deep brain stimulator. EEG traces are shown at three sweep speeds. Spikes from the brain stimulator are evident. No BIS reading is displayed. EEG tracings were obtained using a BIS Quatro Sensor (version XP; Covidien, Boulder, CO).

Examples of raw frontal electroencephalographic (EEG) traces with concurrent Bispectral Index (BIS) values. A, electrocardiographic (ECG) artifact is evident with persistently suppressed EEG trace. The BIS value is appropriately very low despite the ECG artifact. B, Slow delta waves and spindles are seen at four different EEG sweep speeds. The BIS value is 40, which is congruent with the raw EEG trace. C, Ventricular fibrillation artifact is present on the EEG trace. The underlying EEG rhythm is persistent suppression. The BIS value should be very low, but instead is showing 40. D, This patient has a deep brain stimulator. EEG traces are shown at three sweep speeds. Spikes from the brain stimulator are evident. No BIS reading is displayed. EEG tracings were obtained using a BIS Quatro Sensor (version XP; Covidien, Boulder, CO).