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of arousal, the CSI is a valuable tool in their anaesthetic management.
BS% Indicator
The monitor includes a Burst Suppression indicator to show periods when the EEG is iso-electric or "flat".
The indication appears in the upper left-hand side of the graph window in the display and shows the
percentage of burst suppression over the last 30 seconds of the EEG signal. A BS% = 20 readouts means that
the EEG has been iso-electric during 20% of the last 30 seconds.
Signal Quality Indicator (SQI%)
SQI% measures the quality of the acquired EEG signal. The calculation is based on a number of artifacts
during the last minute. The quality is displayed numerically as a percentage (0-100%, 100%equals best
signal quality) in Display Mode A.
Sensor Impedance
The impedance of the white and black sensors is continuously measured and displayed in Display Mode C.
Low sensor impedance values (typically between 1 and 3 k Ω ) are essential for good monitor operation. A
"<1 k Ω " readout means that sensor impedance is optimal.
Sensor Alarm
The Sensor Alarm signals the interruption of reliable CSI calculation due to corrupted or interrupted EEG.
This is usually caused by the use of diathermia or a faulty sensor connection (high sensor impedance or
disconnection of sensor leads). Should any o these situations occur, the RED Error light (2) will turn on. The
CSI is not calculated during these periods.
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