Electroencephalogram (EEG)
An electroencephalogram (EEG) is a noninvasive test that records electrical patterns in your brain. The test is used to help diagnose conditions such as:
- Seizures
- Epilepsy
- Head injuries
- Dizziness
- Headaches
- Brain tumors
- Sleeping problems.
- To confirm brain death
Preparation
Before the test, you should take the following steps:
Wash your hair the night before the EEG, and don’t put any products (like sprays or gels) in your hair on the day of the test. Ask your doctor if you should stop taking any medications before the test. You should also make a list of your medications and give it to the technician performing the EEG. Avoid eating or drinking anything containing caffeine for at least eight hours before the test. Your doctor may ask you to sleep as little as possible the night before the test if you have to sleep during the EEG. You may also be given a sedative to help you relax and sleep before the test begins. After the EEG is over, 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’ll have to bring someone with you so they can take you home after the test. You’ll need to rest and avoid driving until the medication wears off.
Procedure of EEG
During the procedure, electrodes consisting of small metal discs with thin wires are pasted onto your scalp. The electrodes detect tiny electrical charges that result from the activity of your brain cells. Once the electrodes are in place, an EEG typically takes up to 60 minutes. If you need to sleep for the test, it may take up to three hours. You can relax in a comfortable position with your eyes closed during the test. There are no risks associated with an EEG. The test is painless and safe.
