Electroencephalogram
An electroencephalogram (EEG) is a test to detect problems in the electrical activity of the brain
How the test is performed?
The test is performed by an EEG technician. You will be asked to lie on your back on a bed.
The technician will apply between 16 and 25 flat metal disks (electrodes) in different positions on your scalp. The disks are held in place with a sticky paste. The electrodes are connected by wires to an amplifier and a recording machine.
The recording machine converts the electrical impulses into patterns that can be seen on a computer screen, as well as stored on a computer disk. Before computers, the activity was printed on paper. In either case, the electrical activity looks like a series of wavy lines. You will need to lie still with your eyes closed because any movement can alter the results.
You may be asked to do certain things during the recording, such as breathe deeply and rapidly for several minutes or look at a bright flashing light.
Will the test cause any discomfort?
What abnormal results mean?
- An abnormal structure in the brain (such as a brain tumor)
- Attention problems
- Tissue death due to a blockage in blood flow
(cerebral infarction) - Drug or alcohol abuse
- Head injury
- Hemorrhage (abnormal bleeding caused by a ruptured
blood vessel) - Migraines (in some cases)
- Seizure disorder (such as epilepsy or convulsions)
- Sleep disorder (such as narcolepsy)
Normal results
Is there any risk involved?
Alternative names
Electroencephalogram, Brain wave test
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