User's Manual

Contents
24-5
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Setting Up the EEG Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Configuring the EEG Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Storing a Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Recalling a Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
EEG Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EMG Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Archiving EEG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Marking Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Storing DSA/Trend Snapshots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Recalling DSA/Trend Snapshots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Erasing Snapshots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Printing EEG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Patient Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Remote Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
EEG
Overview
The Spacelabs Medical Electroencephalograph (EEG) module is a two or four
channel processed EEG monitor, used to acquire, process, and display brain
electrical activity. The module also includes one channel of EMG
(electromyogram) for measuring and displaying muscle electrical activity.
The EEG can be displayed as an analog waveform or as processed EEG. The
analog EEG is displayed as a moving waveform similar to ECG. The analog signal
is converted to the frequency domain using the Fast Fourier Transform (FFT)
algorithm, and displayed as a spectral plot (density spectral array) or as trended
parameters.
EEG data is displayed in a left/right hemisphere orientation for both the analog
and processed data. The data appearing on the left part of the display indicates
left hemisphere EEG, while the right part of the display shows right hemisphere
EEG. This right and left orientation of the display remains consistent throughout
the various display types. Display formats include analog EEG, density spectral
array (DSA), and various EEG trends.
EEG can be viewed in single or dual format. The single format displays one type
of EEG at a time. If you wish to see two EEG formats at one time, choose dual
format display. With dual format display, you can see both DSA and analog, trend
and analog, DSA and trend, or two trends.
A snapshot of DSA and trends can be stored and recalled. EEG data can also be
marked with an event label to facilitate recall for later examination.