Dräger Infinity Delta - Page 196

11-8 DELTA/DELTA XL/KAPPA VF8
11 EEG M
ONITORING
Check
Impedance
Tests quality of EEG electrodes’
connection to patient, allowing you to
troubleshoot noisy EEG signals
Impedance control is important when
monitoring EEG, where the signal is
hard to measure. A poor signal may
be due to improper placement of the
electrodes or poor patient
preparation.
Not applicable
NOTES:
• The EEG Impedance menu classifies
the status of each electrode connection
as follows:
Disconnected: Appears (for both of a
channel's electrodes) if either of a
channel's electrodes is disconnected or
has an impedance value > 250 kOhms.
Cannot Measure: Appears if the
Neutral electrode is disconnected or if
the channel 1 amplifier pair is open.
• Always check impedance when applying
electrodes. Recommended electrode
value is < 5k ohms.
The EEG Options Submenu
Parameter 1
Parameter 2
Parameter 3
Allows you to select up to three
parameters for display in the EEG
parameter boxes
All EEG channels display the same
parameters.
The figure below shows the median
and spectral edge frequencies, as
well as the distribution of the Delta,
Theta, Alpha, and Beta frequency
bands, as shown in the Power
Spectra screen.
• Med (Median) – Frequency at median
point, where 50% of the energy lies
above and below
• SEF (Spectral Edge Frequency) —
Frequency below which user-defined
percentage of the power lies
If SEF is set to 90%, 90% of the power
lies (for example, if SEF is set to 90%,
90% of the power lies below the marked
bar).
• BSR (Burst Suppression Ratio) —
Percentage of time the EEG waveform
is flatlined over the last 60 seconds
(when flatline EEG alternates with
“bursts” of activity)
• Power (Total Power) — Sum of total
EEG energy (not the amount of power at
each frequency) displayed in decibels
(dB)
• Delta (Delta Power)
—Percentage of
Total Power between 0.5 and 4 Hz
(cycles per second)
• Theta (Theta Power) — Percentage of
Total Power between 4 and 7 Hz
• Alpha (Alpha Power) — Percentage of
Total Power between 8 and 13 Hz
• Beta (Beta Power)
— Percentage of
Total Power between 13 and 30 Hz
Menu Item Description Available Settings
Amplitude
Hz
Median
SEF @ 90%
Theta
Alpha
Beta
Delta