SECTION 3 OPERATING THE BIS VISTA MONITORING SYSTEM
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3.3.6 BIS Trend Graph
The BIS Trend Graph plots the values of the Bispectral Index over time. The BIS trend is
indicated with a thick line and its unit labels appear on the left axis. The name BIS is
displayed above the left corner of the graph and the current date and time display in the
center. (See Figure 9 and Figure 10.)
On the right, a unique Case ID number is displayed. A new case number is assigned when a
new sensor is attached to the PIC and passes the Sensor Check.
If a target range for BIS has been set, the target area displays as either a colored bar or two
horizontal lines showing the upper and lower target ranges (depending on the user setting).
If the BIS value falls outside of the target range, a message displays in the Message Region of
the screen, and if an audible alarm was requested in the target range setup screen, the alarm
sounds (unless alarms have been silenced). The alarm continues to sound until the BIS value
returns to the target range or the alarm is silenced by pressing the alarm touch key. See
Section 3.5.1 for more information.
A secondary variable may be added to the display by selecting “Suppression Ratio,”
“EMG,” “Signal Quality” or “ Bursts/Minute” as a secondary variable in the menu system.
(See Section 3.5.2 “Secondary Variable” for instructions.) The secondary trend is shown with
a thin line and its unit labels appear on the right axis. The secondary trend name is displayed
above the right corner of the graph. Note that Burst Count is only available as a secondary
variable when a BIS Extend Sensor is in use.
During periods of poor signal quality, an artifact bar appears along the horizontal axis at the
bottom of the graph. When signal quality is considered too low to calculate a BIS value, the
bar becomes bright yellow and any trend variables that are adversely affected by artifact will
not be displayed.
A Data Snapshot may be taken to save up to 10 minutes of data leading up to a significant
event. A Data Snapshot Marker (a camera icon) displays at the bottom of the BIS Trend
Graph at the time the snapshot was taken. Only one set of data is saved in memory at a time.
When a second snapshot is taken, the snapshot marker from the first snapshot changes from
a camera to a diamond and its data are overwritten. Snapshot data may be saved to a
removable drive. To export snapshot data, see Section 3.5.11 “Export Data.” To save
snapshot data in a printable (PDF) format, see Section 3.5.13 “Print (Snapshot).”
If desired, EEG may be displayed in place of the BIS Trend Graph by selecting the EEG
display mode in the menu system. See section 3.5.5 “BIS/EEG Display Modes” for details.
During the sensor check procedure, this area of the screen is used to issue instructions and
report current status.
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