Epilepsy research: EEG | NHS

An EEG, or electroencephalogram, is a test used to evaluate the electrical activity in the brain. It is commonly used to diagnose conditions such as epilepsy.

An EEG can detect abnormal electrical activity in the brain that is associated with epileptic seizures, making it an essential tool in diagnosing epilepsy.

During an EEG, small electrodes are attached to the scalp with conductive paste or gel. The person being tested may be asked to sit still, close their eyes, or perform certain activities while the machine records their brain's electrical activity.

No, an EEG is a non-invasive and painless procedure. The electrodes on the scalp are attached using adhesive, and there are no electric shocks involved.

A standard EEG typically takes about 30 to 60 minutes, though longer monitoring over hours or even days (ambulatory EEG) may be required in certain cases.

Before an EEG, you may be asked to wash your hair but avoid using conditioner or hair styling products. You should also follow any instructions given by your doctor regarding sleep and medication.

Yes, you can usually eat and drink as normal before an EEG unless your doctor advises otherwise. However, you should avoid consuming caffeine for several hours before the test.

During the EEG, you will be asked to relax in a reclined chair or lie on a bed while the electrodes record your brain's activity. You may need to follow simple instructions such as opening and closing your eyes or taking deep breaths.

EEGs are very safe and have no significant risks. Rarely, the test may trigger a seizure in a person with epilepsy, but medical staff are always present to manage such situations.

Your EEG results will be reviewed by a neurologist or specialist, and your doctor will discuss the findings with you during a follow-up appointment.

Abnormal EEG results may indicate epilepsy or other brain disorders. Your doctor will interpret the findings and discuss what they mean for your specific condition.

Not always. Sometimes, the electrical activity associated with epilepsy does not occur during the test, and additional tests may be needed to accurately diagnose epilepsy.

Do not stop taking your medication unless your doctor instructs you to do so. Some medications can affect the results, and your doctor will provide specific guidance based on your situation.

Yes, EEGs can be performed on children. The procedure is adapted to make the child as comfortable as possible, and parents may be able to stay with their child during the test.

The frequency of EEGs will vary depending on your individual condition and the recommendations of your healthcare provider. In some cases, only one EEG is needed, while in others, regular monitoring may be necessary.