For example, if you have a seizure disorder , the EEG can show where abnormal activity in your brain comes from and can help distinguish between generalized or focal seizures. An EEG is of value for diagnosing epilepsy only if it detects patterns typical of epilepsy. EEG can also detect abnormal brain waves after a head injury, stroke, or brain tumor. Other conditions such as dizziness, headache, dementia, and sleeping problems may show abnormal brain patterns.
A technician can perform the test in the doctors office, a specially designed clinic, or in the hospital. You will be asked to lie on a table or sit in a reclining chair. About 20 small electrodes will be attached to your head with washable glue. The technician may ask you to do several things during the test, such as asking you to open and close your eyes, breath deeply and rapidly hyperventilation , or look at a flashing light.
Procedures may vary depending on your condition and your healthcare provider's practices. Talk with your healthcare provider about what you will experience during your test. Once the test is completed, the electrodes will be removed and the electrode paste will be washed off with warm water, acetone, or witch hazel.
In some cases, you may need to wash your hair again at home. If you took any sedatives for the test, you may be required to rest until the sedatives have worn off. You will need to have someone drive you home.
Skin irritation or redness may be present at the locations where the electrodes were placed, but this will wear off in a few hours. Your healthcare provider will inform you when you may resume any medicines you stopped taking before the test. Your healthcare provider may give you additional or alternate instructions after the procedure, depending on your particular situation. Health Home Treatments, Tests and Therapies.
Why might I need an EEG? There may be other reasons for your healthcare provider to recommend an EEG. What are the risks of an EEG? Certain factors or conditions may interfere with the reading of an EEG test. These include: Low blood sugar hypoglycemia caused by fasting Body or eye movement during the tests but this will rarely, if ever, significantly interfere with the interpretation of the test Lights, especially bright or flashing ones Certain medicines, such as sedatives Drinks containing caffeine, such as coffee, cola, and tea while these drinks can occasionally alter the EEG results, this almost never interferes significantly with the interpretation of the test Oily hair or the presence of hair spray How do I get ready for an EEG?
Your healthcare provider will explain the procedure to you and you can ask questions. You will be asked to sign a consent form that gives your permission to do the procedure. Read the form carefully and ask questions if something is not clear. You can continue with your regular routine. However, if you were given a sedative, the medication will remain in your system for a little while. This means that you may need to have someone with you to take you home after the test.
A neurologist someone who specializes in nervous system disorders interprets the recordings from the EEG and then sends the results to your doctor. Your doctor may schedule an appointment to go over the test results with you. Electrical activity in the brain appears in an EEG as a pattern of waves.
Different levels of consciousness, like sleeping and waking, have a specific range of frequencies of waves per second that are considered normal. The EEG will show if the frequency of waves or patterns is normal. Before you review the results, it may be helpful to write down any questions you might want to ask.
An EEG is a test that measures your brain waves and helps detect abnormal brain activity. The results of an EEG can be used to rule out or confirm conditions, such as epilepsy, a brain tumor, or a stroke.
Epilepsy is a chronic disorder that causes unprovoked, recurrent seizures. Find out what causes it, who's at risk, how it's diagnosed, and more.
Giving your child a substance you've been led to believe is harmful and addictive is cause for concern. But what if it can help them? Epilepsy isn't funny. Neither are seizures. This test can record brain activity over several days, which increases the chances of catching seizure activity. However, compared to inpatient video- EEG monitoring, an ambulatory EEG is not as good at determining the difference between epileptic seizures and nonepileptic seizures.
The technician removes the electrodes or cap. If you had no sedative, you should feel no side effects after the procedure, and you can return to your normal routine.
If you used a sedative, it will take time for the medication to begin to wear off. Arrange to have someone drive you home.
Once home, rest and don't drive for the rest of the day. Your doctor might schedule an office appointment to discuss the results of the test. If possible, bring along a family member or friend to the appointment to help you remember the information you're given.
Explore Mayo Clinic studies of tests and procedures to help prevent, detect, treat or manage conditions. Our patients tell us that the quality of their interactions, our attention to detail and the efficiency of their visits mean health care like they've never experienced.
See the stories of satisfied Mayo Clinic patients. Janice Breien was anxious to find a better way to manage the seizures that regularly disrupted her daily life. Enter her Mayo care team -- ready to listen and provide solutions. Now, with her seizures under control, Janice has a renewed sense of optimism.
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