SECTION 3 OPERATING THE BIS VISTA MONITORING SYSTEM
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3.3.7.3 Print Icon
The Print icon is displayed below the BIS number while printable files are being
written to a removable USB drive inserted in the rear of the monitor.
3.3.7.4 Extend Mode
The message, “EXTEND MODE ON,” displays below the BIS number when a BIS Extend
Sensor is in use. Note that the monitor automatically changes to the smoothing rate that was
set in Mode II (ICU) when a BIS Extend Sensor is attached.
3.3.7.5 Suppression Ratio (SR) Number
The Suppression Ratio (SR) is displayed in the upper right corner of the screen only when it
has been requested by the user. Suppression ratio is a calculated parameter designed to
indicate when an isoelectric (flatline) condition may exist. Suppression ratio is the percentage
of time over the last 63-second period that the signal is considered to be in the suppressed
state. For example: SR=11 (isoelectric over 11% of the last 63 second review).
When SR reaches 100%, the message “Isoelectric EEG Detected” will notify the user.
Suppression ratio can be plotted over time as a secondary trend on the BIS Trend Graph.
3.3.7.6 Burst Count (Bursts/Minute)
When a BIS Extend Sensor is in use, the Burst Count is displayed above the EEG waveform
display. Burst Count is an alternative method of quantifying suppression, reported as the
number of EEG bursts per minute. The system defines a “burst” as a short period of EEG
activity, preceded and followed by periods of inactivity. When the signal quality is low or
when the Suppression Ratio is less than 5, the Burst Count is not displayed.
The Burst Count may also be graphed as a secondary variable on the BIS Trend Graph.
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