Electroencephalography (EEG)

Routine EEG

An electroencephalogram (EEG) consists of recording brainwaves (electrical signals from the head). Little discs are applied to the head so please ensure that your hair is clean and do not apply any hairspray, mousse, gel or cream. If you think there is any risk of head lice or nits please contact the EEG department for advice. The technician recording the test will explain it in more detail during the appointment. This test usually takes up to one hour. Please eat and drink normally before the test and continue any prescribed medicines.

In some cases, you are asked to perform deep breathing and to watch a flashing light while the EEG is recording. In patients who have epilepsy these procedures can very occasionally bring on a seizure. If you have epilepsy and have regained a driving licence having such a seizure will risk suspension of your driving licence. You may wish to discuss this with your doctor and with the technician performing the test before these parts of the test are performed.

Sleep EEG

Sometimes I will request a sleep EEG. This is not available in all EEG departments. It is still an out-patient procedure that is usually done late afternoon The EEG doctor will prescribe sleeping medicine and recordings will be made both awake and asleep. Please eat and drink normally before the test and continue any prescribed medicines. Please wear casual clothes in which it will be comfortable to sleep. You will be in the EEG department for two to three hours. Sleepiness may occur for some hours after the test. All patients must be accompanied on their way home and afterwards until fully recovered. If you are not able to make suitable arrangements please let myself or the EEG department know. The test has no other after effects.