For ‘overnight EEGs’ we record brain activity throughout the night while you are asleep. With ‘ambulatory EEGs’ we record your brain activity for a longer period of time (usually 24 hours). This is usually if we have not been able to get enough information from a routine EEG. Sometimes you might need to have an EEG over a longer period of time. There are no after-effects from the test - you can carry on your day-to-day activities as normal Ambulatory and overnight EEGs You will have some paste left in your hair but this will easily wash out with shampoo at home.
If you have a seizure, we will keep the video as part of your confidential medical records. We also make a video recording as part of the test, in case you have a seizure during the EEG. You will not be asked to do this if you are worried or uncomfortable. Some people have seizures triggered by flashing lights (photosensitive epilepsy).There is a small chance that the deep breathing or the flashing light will trigger a seizure. These are:ĭeep breathing (hyperventilation) opening and closing your eyes looking at a flashing light (photic stimulation). We might ask you to do several things, to help show changes in brain activity that may help with your diagnosis. We will ask you to sit on a chair or lie on a bed. The brain activity recording lasts about 20 to 30 minutes. These are connected to the recording machine and computer. The EEG uses a number of small electrodes placed on the head and held in place using a sticky paste. You need to have clean hair for the EEG electrodes to stick to your scalp. Please have something to eat before the test, either breakfast before an EEG in the morning or lunch before an EEG in the afternoon. Please take your medication as normal and bring a list of your medication with you. Make sure that you do not have any hair products, such as gel, spray or oil, in your hair. Some people have epileptiform activity even if they are not having a seizure. This change can be seen on the EEG and is called ‘epileptiform activity’. When someone has an epileptic seizure, their brain activity changes. What does an EEG show?Īn EEG records brain wave activity using electrodes to pick up electrical signals from brain cells. ‘Electro’ means the test records electrical impulses or brain wave activity, ‘encephalo’ means the brain, and ‘graph’ means that the brain wave activity is shown on a computer screen. The following information should tell you everything you need to know about having an EEG at our EEG Telemetry Unit.Īn EEG (or ‘electroencephalograph’) is a test to help with the diagnosis and management of epilepsy. Sudden Unexpected Death in Epilepsy (SUDEP).
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