Mindray ePM 12MC - BIS Parameters; BIS Display

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20.3 BIS Parameters
Single side BIS monitoring provides the following parameters:
Bilateral BIS monitoring simultaneously monitors both cerebral hemispheres. Besides above parameters, it also
provides the following parameters:
20.4 BIS Display
Parameter Description
BIS
(Bispectral Index)
The BIS numeric reflects the patient’s level of consciousness. It ranges from 100 for wide
awake to 0 in the absence of brain activity.
100: the patient is wide awake.
70: the patient is underdosed but still unlikely to become aware.
60: the patient is under general anesthesia and loses consciousness.
40: the patient is overdosed and in deep hypnosis.
0: the EEG is a flat line. The patient has no electrical brain activity.
SQI
(Signal Quality Index)
The SQI numeric reflects signal quality and provides information about the reliability of
the BIS, SEF, TP, and SR numerics during the last minute. The greater the SQI value, the
better signal quality.
EMG
(Electromyography)
EMG bar graph reflects the electrical power of muscle activity and high frequency
artifacts. Low EMG indicates that EMG activity is low. BIS monitoring conditions are
optimal when the bar is empty.
SR
(Suppression Ratio)
SR numeric is the percentage of time over the last 63-second period during which the
EEG is considered to be in a suppressed state.
SEF
(Spectral Edge Frequency)
The SEF is a frequency below which 95% of the total power is measured.
TP
(Total Power)
TP numeric is a measure of the absolute total power in the frequency ranging from 0.5 to
30.0 Hz. The useful range is from 40 to 100 db.
BC
(Burst Count)
A burst means a period (at least 0.5 second) of EEG activity followed and preceded by
inactivity. The BC numeric helps you quantify suppression by measuring the number of
EEG bursts per minute. For single side BIS monitoring, this parameter is intended for the
BIS module with the Extend sensor only. BC numeric is valid only when SQI≥15% and
SR≥5%.
Parameter Description
sBIS
(BIS Variability Index)
sBIS numeric represents the standard deviation of the BIS variable over the last three
minutes.
sEMG
(EMG Variability Index)
sEMG numeric represents the standard deviation of the EMG value over the last three
minutes.
ASYM
(Asymmetry)
ASYM is a processed variable indicating the percentage of EEG power presented in the
left or right hemisphere with respect to total (left and right) EEG power.
Designation ‘L’ of the asymmetry data indicates asymmetry to the left side.
Designation ‘R’ of the asymmetry data indicates asymmetry to the right side.
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