BIS Continuous Impedance Check

19 Monitoring BIS

Manufacturer’s Information

BISx, the BIS Engine, the DSC, the Patient Interface Cable and the BIS Sensors are manufactured by Aspect Medical Systems.

This checks:

•the combined impedance of the signal electrodes plus the reference electrode.

This is done continuously and does not affect the EEG wave. As long as the impedances are within the valid range, there is no notification of this check or its results.

•the impedance of the ground electrode.

This is done every ten minutes and takes approximately 4 seconds. It causes an artifact in the EEG wave, and the message Ground Check is shown on the monitor screen during the check. If the ground electrode does not pass this check, another check is started. This continues until the ground electrode passes the check.

If the Continuous Impedance Check interferes with other measurements, it can be switched off. To do this:

1In the Setup BIS menu, select Cont.Imp.Check.

2Select On/Off to toggle between the settings.

CAUTION Switching the continuous impedance check off will disable automatic notification to the user of impedance value changes, which may lead to incorrect BIS values. Therefore, this should only be done if the check interferes with or disturbs other measurements.

When a Semi-reusable Sensor is in use the continuous impedance check cannot be switched off. If it is switched off when the sensor is connected, it will automatically be switched on again.

BIS Cyclic Impedance Check

This measures the exact impedance of each individual electrode. It causes a disturbed EEG wave, and the INOP BIS IMPEDANCE CHCK is shown on the monitor screen during the check.

Starting a Cyclic Impedance Check

The Cyclic Impedance Check is automatically started when a sensor is connected. To manually start a Cyclic Impedance Check:

♦select Cyclic Check in the BIS Setup menu to toggle between On and Off, or

♦select Start Cyclic Check in the BIS window.

Stopping a Cyclic Impedance Check

The Cyclic Impedance Check stops automatically if the impedances of all electrodes are within the valid range. To manually stop a Cyclic Impedance Check:

♦ select Cyclic Check in the BIS Setup menu to toggle between On and Off, or

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MP60/70/80/90, MP40/50, MP20/30 specifications

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Philips MP20/30, MP60/70/80/90, MP40/50 BIS Continuous Impedance Check, BIS Cyclic Impedance Check

Models: MP60/70/80/90 MP40/50 MP20/30

Manufacturer’s Information