Electroencephalogram (EEG)
When an EEG is used
An EEG can be used to help diagnose and monitor a number of conditions affecting the brain.
It may helpidentify the cause of certain symptoms such as seizures (fits) or memory problems or find out more about a condition you've already been diagnosed with.
The main use of an EEG is to detect andinvestigateepilepsy, a condition that causes repeated seizures. An EEGwill help your doctor identify the type of epilepsy you have, what may be triggering your seizures, and how best to treat you.
Less often, an EEG may be used to investigate other problems, such as dementia, head injuries, brain tumours,encephalitis(brain inflammation) and sleep disorders, such as obstructive sleep apnoea.
Medically Reviewed by a doctor on 21 Dec 2018
Introduction
Read about why an electroencephalogram (EEG) recording may be needed and find out what happens before, during and after the test.
When an EEG is used
An EEG can be used to help diagnose and monitor a number of conditions affecting the brain.It may helpidentify the cause of certain symptoms such as seizures (fits) or memory problems or find out more
Preparing for an EEG
Your appointment letter will mention anything you need to do to prepare for the test.Unlesstold otherwise, you can usually eat and drink beforehand and continue to take all your normal medication.To h
How an EEG is carried out
There are several different ways an EEG recording can be taken. The clinical neurophysiologist will explain the procedure to you andcan answerany questions you have.You'll also be asked whether you gi
Types of EEG
The main types of EEG are explained below.Routine EEGA routine EEG recording lasts for about 20 to 40 minutes.During the test, you'll be asked to rest quietly and open or close your eyesfrom time to t
What happens after an EEG
When the test is finished,the electrodes will be removed and your scalp will be cleaned. Your hair will probably still be a bit sticky and messy afterwards, so you may want to wash it when you get hom
Are there any risks or side effects?
The EEG procedure is painless, comfortable and generally very safe. No electricity is put into your body while it's carried out. Apart from having messy hair and possibly feeling a bit tired, you won'
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