User Manual

3. EEG/PSG MEASUREMENT
3.12 Operator's Manual WEE-1000
Attaching the Electrodes and Sensors (PSG Measurement)
Measurement Parameters
and Attachment Sites
This section explains the standard attachment sites of the electrodes and sensors for
measuring polysomnogram.
Electroencephalogram (EEG)
The EEG waveforms are measured with the monopolar derivations from C3-A2 (or
C4-A1) and O1-A2 (or O2-A1). The reference electrodes are the respective
opposite earlobes to obtain large amplitude EEG waveforms. The central
derivations can measure alpha waves, theta waves, hump waves, spindle waves and
K complexes simultaneously and the occipital derivations can precisely detect the
exact appearance of alpha waves. Arousals can be scored from either the central or
occipital derivation EEG.
To attach the electrodes, refer to "Attaching the Electrodes".
Electrooculogram (EOG)
The EOG waveforms are measured with the monopolar derivations from E1 (LOC)
/A1 (or E1/A2) and E2 (ROC) /A1 (or E2/A2). The E1 and E2 electrodes should
be attached 1 cm from the outer corner of the eye. The left electrode should be
placed 1 cm above the corner of the eye and the right electrode 1 cm below the
corner of the eye. Use A1 or A2 as a reference electrode.
To attach the electrodes, refer to "Attaching the Electrodes".
Electromyogram (EMG)
The EMG waveforms are measured with the bipolar derivation from the pair of
disk electrodes on the musculus mentalis or submental muscle. The two disk
electrodes are attached several cm apart along the jaw bone from the center of the
chin. For male patients, select a site where there is no beard because beard grows
during measurement.
To attach the electrodes, refer to "Attaching the Electrodes".
Electrocardiogram (ECG)
The ECG waveforms are measured with the CS5 lead, or modified bipolar lead
(MI). To reduce the electrodes to be used, the A2 electrode is used instead of the
minus electrode.
C3C4
A2 A1
EEG
EOG
EOG
G1: R/RA
G2: C5/V5
E2 E1
A2
A1
EMG