What does EEG stand for ?
EEG satnds for Electroencephalogram.

How is EEG useful ?
As was already discussed the neurons in the brain are charged & information is passed between them in the form of electrical currents. EEG is a record of these currents. It picks up any abnormal currents produced by neurons. This helps by helping to localise the abnormal set of neurons.

How is an EEG recorded ?
EEG is recoreded with the help of leads placed on the scalp. A routine EEG takes about 30 minutes during which the patient is resting but awake. This is followed by EEG during overbreathing for 2-3 minutes & EEG during photic stimulation(pt exposed to flashing light).

Does a normal EEG rule out Epilepsy ?
NO. EEG is often normal in patiets of epilepsy. Since it is commonly done when there is no seizure; it can be normal & yet the patient has epilepsy.

What is ambulatory EEG ?
Recording electrodes are attached to the scalp, the wiring being scarcly visible under the normal hair. A portable recorder is worn on a belt. Since the patient wears the EEG leads, a 24 hour recording is possible. The recording during a seizure episode can be better studied. Thus it tries to overcome the drawback of the routine EEG .

What is Video EEG ?
The patient wears the EEG leads & is confined to a video EEG room & asked to remain within the camera range. A split screen gives the simultaneous view of the patient & the EEG. Thus the abnormal dischrges in the brain (recorded by EEG) can be correlated with the abnormal movements of the patient during the seizure.