Monitoring
244
Instructions for use Zeus Infinity Empowered SW 2.n
The measured value remains up to the next meas-
urement (Auto mode is not possible).
BIS monitoring
The BISx module plots the electroencephalogram
(brain wave). The brain wave reflects all brain activ-
ity produced in the cortical region of the brain.
The electric signals from the brain are picked up by
an easy-to-apply Multi-Sensor (BIS sensor), proc-
essed in the BISx pod and displayed on Zeus IE.
The BIS index calculated indicates a number be-
tween 1 and 100. The value of 100 indicates a con-
scious patient while values below 70 indicate suffi-
cient sedation/hypnosis.
This table reflects a general association between
clinical state and BIS values.
The areas are based on a multi-center study.
For the BIS values and BIS areas, it must be as-
sumed that they are free of artefacts that could in-
fluence the measurement.
BISx technology is the latest generation of BIS
technology, which features enhanced screening
against artefacts from external HF surgery equip-
ment and filters out any EMG influences.
The BIS index provides insight to the cerebral sta-
tus and is not a measurement of drug concentra-
tion. The cerebral cortex responds very sensitively
to external influences, drugs and pathological proc-
esses. The BIS index decreases during normal
sleep and also during administration of hypnotic
drugs.
However, the values during normal sleep do not fall
as low as those during anesthesia.
The BIS index is determined as an average over a
period of 15 seconds and generated every second.
206
BIS area Clinical state
100 Conscious
Response to normal voice
80 Light/moderate sedation
Possible response to loud com-
mands or gentle pushing / shaking
60 General anesthesia
Low probability of explicit memory
No response to verbal stimulus
40 Deep hypnosis
20 Burst Suppression
0 Baseline EEG
10
4
0
11:41
NMT
%
Count
Tem p ° C
PTC
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