Monitoring Bispectral Index (BIS™)
Efficia CM Series Rack and Modules Instructions for Use 5-11
BIS Impedance
BIS Impedance
The BIS module checks electrode impedance levels continuously during a procedure by
utilizing a 128 Hz test signal. Occasionally this signal may interfere with other equipment.
If this becomes a problem, you may turn off the continuous impedance checking (see
below). Impedance levels will still be tested at startup, but once they pass, they will not
be tested again until a new case is begun, or a manual impedance check is initiated.
The following screen shots show the Impedance Test results for a 4-Electrode Sensor
and a Bilateral Sensor:
Figure 5-6 Sensor Checking Examples
Notes
• Even when Auto Check Impedance is unchecked, an impedance check is executed when a
sensor is connected.
• Positive impedance measurements may interfere with EEG monitoring.
• During ground impedance checks, the EEG signal is disconnected and therefore normal
BIS monitoring cannot take place if the BIS Device stays in the GROUND state.
To turn continuous impedance checking off, select the BIS numeric pane.
4-Electrode Sensor
Bilateral Sensor
Step
1
Open the BIS numeric pane.
2
Clear the selection for Auto Check Impedance
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