Operator's Manual

Table Of Contents
Four-Channel Monitoring
92
BIS™ Advance Monitor
Label Function Description
using an Extend
sensor or monitoring
with four-channel
monitoring)
3.8. Four-Channel Monitoring
The monitor provides the option of monitoring both hemispheres of the brain, using
a Bilateral sensor. This is known as four-channel or bilateral monitoring. The option
may provide useful information to the clinician.
The bilateral system consists of the BIS™ Advance monitor, the BISx4 module, the PIC-
4 (which is an integral part of the BISx4 module) and a BISBilateral Sensor. This
section describes the additional features and options available when performing
four-channel monitoring.
During four-channel monitoring, the BIS™ Advance monitor acquires four channels of
EEG data, calculates BIS numbers and other variables for the left and right sides of the
brain, and reports them to the monitor for display. The user selects which side of the
brain is shown most prominently on the screen.
The designation ‘L’ (left) or ‘R’ (right) denotes which side of the brain is displayed. In
addition, data from the left side of the brain display in pink, while data from the right
side display in blue. BIS is calculated the same way as for the two-channel sensors
(e.g. Quatro), using two EEG channels from the left side of the brain for BIS L and two
EEG channels from the right side for BIS R.
If a Bilateral sensor and a BISx4 module are connected to the monitor, the monitor
will detect the sensor and automatically move to four-channel monitoring mode. The
four-channel (bilateral) screen (reference Figure 30. Sample 4-channel BIS™ Screen on
page 94) will provide information on both hemispheres of the brain, as follows:
A L/R button ( ) enabling the selection of the hemisphere which will be
displayed more prominently will appear on the upper left side of the screen under
the menu button. Some data will appear for both hemispheres no matter which
hemisphere is selected with this button, while other information will appear only for
the selected hemisphere. By default, the left hemisphere is selected for more
prominent display.