The electrical activity of brain is recorded by this test. The record is analysed for abnormalities in brain rhythm.

EEG is done in the following conditions:

• Epilepsy to confirm the diagnosis.
• In spells of unconsciousness/ fainting - EEG is useful in differentiating these disorders from epilepsy.
• Encephalitis (viral inflammation of brain e.g viral infections).
• Dementia.
• Stroke.
• Brain tumour

The EEG is useful for diagnosis to decide about medication, in monitoring the response to treatment and in long term follow up to evaluate the course of the disease.

Details of Procedure

• The test is painless.
• The patient lies on the bed quietly.
• Electrodes (small metal discs) are placed on the head.
• During the test the patient may be asked to open and close the eyes on a few occasions, may be asked to breathe rapidly for few minutes. The patient is encouraged to relax with eyes closed and encouraged to sleep.
• The time required for preparation and actual recording may take approximately 40-60 minutes.
• There are no side effects.

Instructions

• Do not apply oil on the head.
• Take a light meal, avoid fasting.
• Take routine drugs.
• Small children and uncooperative patients may be given sedative medicine.This is an outpatient procedure. There is no need for admission to the hospital.