Epilepsy and the Electroencephalogram (EEG)

An EEG, or electroencephalogram, is a test that can help diagnoseepilepsy. During an EEG, the electrical signals of the brain are recorded. This electrical activity is detected by electrodes, or sensors, placed on the patient'sscalp交流和传播的测谎仪记录tivity.

Electrical signals produced by the brain neurons are picked up by the electrodes and transmitted to a polygraph, where they produce separate graphs on moving paper using an ink writing pen or on a computer screen.

To prepare for your EEG you should:

Discuss any medications you are taking with your doctor prior to your procedure.

Wash your hair the night before the test. Do not use hair cream, oils, or spray afterward.

During an EEG, you lie down on the examining table or bed while about 20 electrodes are attached to your scalp. You are asked to relax and lie first with your eyes open, then later with them closed. You may be asked to breathe deeply and rapidly or to stare at a flashing light -- both of these activities produce changes in the brain-wave patterns. If you are prone toseizures, it is rare that you may experience one during the test. If you are being evaluated for asleepdisorder, EEG may be performed continuously during the night while you are asleep. Such a recording, which may involve an evaluation of other body functions duringsleep, such asrespirationand pulse, is referred to as polysomnography.

When the EEG is done, the electrodes are removed and the glue that held them in place is washed away with acetone. You may have to use additional acetone at home to completely remove the glue. Unless you are actively havingseizuresor are restricted by your doctor, you may drive home. If the EEG was performed overnight, you should arrange to have someone drive you home. If you stopped taking anticonvulsant药物for the EEG, you can usually start taking them again.

Aneurologistexamines the EEG recording for abnormalities in the brain-wave pattern, which may reflect diseases of the nervous system.

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