User’s Manual for Omega 12Patient Monitor
97
NOTE
This monitor uses a component modular device in deriving the Bispectral index (BIS)
purchased from Covidien. It is important to recognize this index is derived using solely that
company’s proprietary technology. It is recommended that clinicians have reviewed
applicable information on its utility and/or risks in published articles and literature/web site
information from Covidien (www.covidien.com) or contact that company itself if they have
clinical-based BIS questions relating to this module portion of the patient monitor.
The BISx equipment is a 2-channel EEG signal monitoring device for unilateral cerebral
hemisphere BIS monitoring.
The BISx equipment must be used under the direct supervision of a licensed healthcare
practitioner or by personnel trained in its proper use.
14.3 BIS Parameters
Unilateral cerebral hemisphere BIS monitoring measures the following parameters:
Parameter
Explanation
BIS
The BIS numeric reflects the patient’s level of consciousness. It
ranges from 100 (fully awake) to 0 (suppression; no electrical brain
activity). The higher the value, the more conscious the patient is; the
lower the value, the deeper the anesthesia. During surgery, the BIS
value of a patient under general anesthesia is usually between 40 and
60.
100: The patient is widely 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 waveform is displayed as a flat line, and the patient has
no electrical brain activity.
SQI
The SQI numeric reflects signal quality and provides information
about the reliability of the BIS, SEF, TP, and SR numerics during the
last minute. It ranges from 0-100%.
The higher the value, the better the signal; the lower the value, the
worse the signal. If the signal strength is too weak to calculate the