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The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. However, there will be trained medical staff on hand if this does occur. There is a risk for people with epilepsy that the effect of certain stimuli on the brain may trigger a seizure during the EEG. Risks and side effectsĮEGs are generally very safe. Some people may need to take a sedative to help them sleep during the test. You may also need to have an EEG recording done while you are asleep. Sometimes, it is necessary to have less sleep the night before the test, so that your doctor can assess the effect of sleep deprivation on your brain’s electrical activity. Some people may need to stop taking certain medicines before the test, but it’s important to only stop your medicines if instructed by your doctor. tea, coffee or chocolate) for 6 to 8 hours before your EEG. You may be advised to avoid eating or drinking anything that contains caffeine (e.g. It is important that your scalp is not oily, so wash your hair on the day of the test (or the night before), but do not use any hair conditioner or other hair products, such as hair spray or styling gel. If you have an ambulatory EEG, brain activity is recorded for 24 hours or more. Placing the electrodes usually takes 20 minutes, but can take up to an hour, so the entire procedure may take about one to 2 hours. The test itself will take about 30-60 minutes. During an ambulatory EEG you can still perform many of your usual activities, but there are some restrictions.
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The electrodes are attached to the scalp and plugged into a small portable recording device which is usually worn around your waist. Sometimes your doctor will ask for an ambulatory EEG, where brain activity is recorded for a longer period of time (usually 24 hours) away from the hospital. A video EEG is useful for providing a record of your EEG pattern during the exact time of any suspected seizure activity. If your doctor wants you to have a video EEG - where you are monitored by a video camera while the EEG is in progress - you may need to have a short hospital stay. These activities may trigger a change in the EEG pattern.Īn EEG may be performed in a hospital outpatient department or a specialist doctor’s rooms. You may be asked to perform a few simple tasks, such as reading, opening and closing your eyes, breathing deeply for a few minutes, or looking at a flashing light. This is because movement and nervousness can affect the test results. You will be asked to recline or lie down with your eyes closed for most of the test, and to stay as still and relaxed as possible. Your brain’s electrical activity is seen as a pattern of waves on the EEG machine, which can be printed on graph paper. The electrodes are connected to wires, which send information to an amplifier and recording device. The electrodes may be stuck to your scalp using a special adhesive paste, or you may wear an elastic cap that is fitted with electrodes. To do this, usually between 16 and 25 electrodes (small, flat metal discs) need to be placed on your scalp, over different areas of your brain. How is this test performed?Īn EEG involves measuring and recording the electrical activity within your brain. encephalitis (inflammation of the brain) ĭoctors can also use an EEG to confirm brain death in someone who is in a coma.Some of the other conditions for which doctors may want to perform an EEG include: What conditions can be diagnosed using an EEG?Īn EEG can be used to help diagnose and assess several conditions that affect the brain, particularly epilepsy (a condition that causes seizures). An electroencephalogram (also called an EEG) is a special test that records these electrical signals that occur within the brain.
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Your brain is active all the time, and its cells communicate with each other via electrical signals.