18 Monitoring BIS
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BIS Window
To open the BIS window, in the Setup BIS menu, select Show Sensor.
The window may look slightly different on your monitor. The graphic in the BIS Window
automatically adapts to show the type of sensor you are using, showing three or four electrodes as
required. Each symbol in the graphic represents an electrode and illustrates the most recently-
measured impedance status of the electrodes. Although BIS may still be measured when the electrode
status is red or yellow, for best performance, all electrodes should be green.
In addition, if the measured electrode-to skin impedance of any electrode or electrode combination is
above the limit, or if disconnected electrodes are detected, an INOP will be issued, either
BIS HIGH
IMPEDANCE
or BIS LEAD OFF.
1 Reference Electrode
2 Ground Electrode
3 Signal Electrode(s)
4 Time of the most recent cyclic check
BIS Impedance Indicators
Electrode-to-Skin
Impedance
Symbol Color Action
Electrode has no skin contact red Reconnect electrode, or check the sensor-
to-skin contact. If necessary, clean and dry
skin.
Too much signal noise,
impedance cannot be
measured
gray Check sensor-to-skin contact. Press sensor
more firmly to skin. If necessary, clean and
dry skin.
Impedance above limit yellow Check sensor-to-skin contact. Press sensor
more firmly to skin. If necessary, clean and
dry skin.
Impedance within valid range green No action necessary
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