ELECTRO ENCEPHALO GRAPHY
EEG
Electroencephalogram (EEG) is the most important neurophysiology’s study for the diagnosis, prognosis, and treatment of epilepsy. It gives a graphical depiction of cortical electrical activity, usually recorded from the scalp. It has the advantage of high temporal resolution but poor spatial resolution of cortical disorders.
Characteristics of pediatric EEG
-
Age-specific
-
Significant maturational changes : Growth and development
-
High amplitude, low frequency
-
Unique waves POSTs
-
Lambda wave
-
Hypnagogic hypersynchrony
-
Hypsarrhythmia
-
3Hz SWC
-
Rolandic Spikes
Physiological Basis of the EEG​
Requirements
- EEG machine (24/32 channels)
- Silver cup electrodes/metallic bridge electrodes
- Electrode jelly
- Rubber cap
- Quiet dark comfortable room
- Skin pencil & measuring tape
The Ideal EEG Contain
- Awake
- Drowsiness
- Transitions
- Sleep
- Arousal
- Activation
Procedure of EEG Recording
-
A standard EEG makes use of 21 electrodes linked in various ways (Montage)
-
Ask the subject to lie down in bed
-
Apply electrodes according to the 10 / 20% system
-
Check the impedance of the electrodes
-
Select a montage
-
Press run switches on to run the paper
-
Press the calibration knob to check voltages & time constant
-
Always observe the subject for any abnormal muscle activity
-
Ask the subject to open eyes for 10 sec.and ask him/her to close eyes. (do this procedure several times in each montage)
