Aspect A-2000 BIS - 9 Appendix; Appendix I - Processed Eeg Variables

SECTION 9 APPENDIX
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9-1
SECTION 9
9 APPENDIX
9.1 APPENDIX I – PROCESSED EEG VARIABLES
Variable Name Description Range
Bispectral Index
(BIS)
The output from a multivariate discriminate
analysis that quantifies the overall bispectral
properties (frequency, power, and phase)
throughout the entire frequency range.
0.0 – 100.0
Signal Quality
Index (SQI)
A measure of the signal quality for the EEG
channel source(s) that is calculated based on
impedance data, artifact, and other variables.
Not affected by Suppression Ratio.
0.0 – 100.0
EMG The absolute power in the 70-110 Hz range.
The power value is reported in dB with respect
to 0.0001μV2. All the artifact detection is
turned off for this variable.
30 – 80 dB Trend
30 – 55 dB Bar
Graph
Suppression
Ratio (SR)
The percentage of epochs in the past 63
seconds in which the EEG signal is
considered suppressed.
0.0 – 100.0 %
Burst Count The number of EEG bursts per minute, where
a “burst” is defined as a short period of EEG
activity preceded and followed by periods of
inactivity (suppression).
0 – 20
Spectral Edge
Frequency (SEF)
The frequency at which 95% of the total power
lies below it and 5% lies above it.
0.5 - 30.00 Hz