GE Dash 4000 Operator's Manual

18-2 Dash™ 3000/4000/5000 2000966-386D
Monitoring Bispectral Index (BIS)
Introduction
Overview
NOTE
Only available in software version 6 or later.
NOTE
Although the external Aspect
®
BISx can monitor EEG, the monitor does not
support EEG monitoring.
The external BISx uses an internal digital signal converter (DSC). The DSC uses
EEG amplifiers and analog filters, and digitizes the resulting waveforms for
transmission and processing by the monitor. It also amplifies and digitizes the EEG
signal close to the patient, to limit the effect of ambient noise sources.
When connected to the monitor, BISx computes the BIS value and other processed
EEG parameters in real-time using three steps:
 The raw EEG signal is broken down second by second and the segments that
have artifact are identified and removed.
 BISx calculates the BIS value by combining EEG features associated with the
anesthetic effect.
 The index is modified to reflect the amount of suppressed EEG signal in the raw
waveform.
The monitor displays the digital values in a parameter window. The display is updated
every two seconds.
900A
The monitor also displays a single raw EEG waveform.
1 Electromyograph (EMG) value
2 Suppression ratio value
3 Signal quality index value
4 Bispectral index value
3
2
1
4

GE Dash 4000 Specifications

General

Resolution	640 x 480 pixels
Power Supply	100-240 VAC, 50/60 Hz
ECG	3/5/12-lead
IBP	Up to 4 channels
Battery Backup	Yes
Certifications	CE, UL, CSA
Parameters Monitored	ECG, SpO2, NIBP, IBP, Temperature, Respiration, Cardiac Output
Connectivity	Ethernet, USB, Serial
Display Type	TFT LCD
Recorder	Integrated thermal printer
Battery Type	Lithium-ion
Operating Temperature	0 to 40°C
Storage Temperature	-20 to 60°C
Humidity Range	15% to 95% non-condensing
Display Size	10.4 inches
Cardiac Output	Available