SedLine Sedation Monitor
Chapter 4: Operation
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29
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Asymmetry Graph
The Asymmetry Graph quantifies the difference in the brain activity between the left and the
right sides with an asymmetry measurement, ASYM, displayed to the right of the graph. An
ASYM value of zero implies that the left and right hemispheres have the same level of
activity. An ASYM value preceded by an “L” implies that the left hemisphere has more activity
relative to the right hemisphere. Conversely, an ASYM value preceded by an “R” implies more
activity on the right hemisphere relative to the left hemisphere. Higher values indicate
greater difference in EEG activity between the two hemispheres.
EMG (Electromyography)
Electromyography (EMG) is a measure of activity in forehead and nearby muscles detecting
activities such as grimacing or jaw clenching.
Numeric Value
EMG is represented by a numeric value that ranges from 0 to 100%. When an EMG numeric
value is not available, the value displays dashes (--). A brief explanation of EMG is available
by pressing the
Numeric Value
and then the
About
icon in the menu that appears.
Trend
EMG trend conveys the EMG numeric values over a period of time. The vertical axis range is 0
to 100% and it is configurable by the user. The horizontal axis represents time which is
configurable by the user.
SR (Suppression Ratio)
Suppression Ratio (SR) is a measure of how much the electrical activity of the frontal and
pre-frontal cortex of the brain is suppressed as a percentage of time.
Numeric Value
SR is represented by a numeric value that ranges from 0 to 100%. When an SR numeric value
is not available, the value displays dashes (--). A brief explanation of SR is available by
pressing the
Numeric Value
and then the
About
icon in the menu that appears.
Trend
SR trend conveys the SR numeric values over a period of time. The vertical axis range is 100%
to 0 and it is configurable by the user. The horizontal axis represents time which is
configurable by the user.
