10-7
1. Measure electrode impedance
2. Time of the most recent impedance check
3. Start/stop cyclic impedance checks
4. Show sensor information
The measured electrode-to-skin impedance and electrode status are displayed above each
electrode:
Status Description Action
[Lead off]
Electrode falls off and has no skin
contact.
Reconnect electrode, or check the
sensor-to-skin contact. If necessary,
clean and dry skin.
[Noise]
The EEG signal is too noisy.
Impedance cannot be measured.
[High]
The impedance is above the limit.
Check the sensor-to-skin contact. If
necessary, clean and dry skin.
[Pass]
The impedance is within valid range. No action necessary.
Although BIS may still be measured when the electrode status is [Noise] or [High], all
electrodes should be in [Pass] status for the best performance.
10.9 Set BIS Smoothing Rate
Select [Smoothing Rate] from the [BIS Module Setup >>] menu and toggle between [10 s],
[15 s] and [30 s].
The smoothing rate defines how the anesthesia machine averages the BIS value. A smaller
smoothing rate indicates increased responsiveness to changes in the patient’s state. A bigger
smoothing rate indicates a smoother BIS trend with decreased sensitivity to artifacts.
10.10 Restore Defaults
Select [Defaults] from the [BIS Module Setup] menu. Then all the options in this menu
except [Cont. Imped. Check] and [Cyc. Imped. Check] are restored to the factory default
configurations.
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