User manual

User Manual for Multi-parameter Patient Monitor

 EMG

Facialis EMG may increase the CSI under certain conditions. The monitor incorporates an EMG filter that

removes most of the potential interfering EMG activity. The EMG bar shows the energy of the EMG level in the

75-85 Hz frequency band (0-100 logarithmic). The bar is located on the right side of the display.

EMG activity is expected to be present when the patient is awake. When the patient is asleep, EMG activity can

increase due to:

 Reflex reactions to painful stimuli during surgery.

 Lack of muscular relaxation.

 Muscular rigidity caused by some opioids (analgesics).

 Presence of large external electrical fields, e.g. diathermy.

The EMG bar should be checked frequently, especially in case of a sudden increase in the SCI. If the increase in

SCI is accompanied by an increase in muscular activity, there is a risk that EMG is causing interference. When

this happens, attention must be paid to the stimuli receive by the patient during surgery. In the presence of

hypnotically unrelated EMG, administration of a neuromuscular blocking agent will cause the CSI to decrease.

Since patients receiving neuromuscular blocking agents cannot exhibit movement as a sign 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

) are essential for good monitor operation. A “<1 k

”

readout means that sensor impedance is optimal.