SECTION 5 FEATURES AND CAPABILITIES
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5-1
SECTION 5
5 FEATURES AND CAPABILITIES
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INTRODUCTION
This section includes:
• How the A-2000 BIS Monitoring System works
• Display Configurations
• Other System Features
5.1 HOW THE A-2000 MONITORING SYSTEM WORKS
A sensor placed on the patient’s head transmits EEG signals to the Digital Signal
Converter. The DSC amplifies and digitizes these signals, then sends them to the
monitor. The monitor software filters the data, analyzes it for artifact, and processes it
using digital signal processing techniques. The purpose of processing the EEG
waveform data is to extract characteristic features from the complex signal in order to
provide easier pattern recognition of changes over time during the recording.
A list of the processed variables and a description of each is provided in Appendix I.
These data are displayed on the screen according to the preferences set by the user in
the Setup Menus.
5.2 SYSTEM FEATURES
5.2.1 Bispectral Index (BIS)
Range = 0 – 100
The Bispectral Index is a continuous processed EEG parameter that correlates to the
patient’s level of hypnosis, where 100=awake and 0=flat line EEG. BIS was designed to
correlate with “hypnotic” clinical endpoints (sedation, lack of awareness, and memory)
and to track changes in the effects of anesthetics on the brain. BIS is displayed as a
number in the upper left corner of the screen and is plotted over time in the Graphic
Display Region.
5.2.2 Signal Quality Index (SQI)
Range = 0 – 100
The SQI is a measure of the signal quality for the EEG channel source and is calculated
based on impedance data, artifact, and other variables. It is displayed in the form of a
simple bar graph located at the top right corner of the display screen. It is optimal when
the SQI bar extends all the way to the right. SQI may also be plotted over time as a
secondary variable on the trend graph.
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