Electroencephalograph
An electroencephalograph, commonly referred to as an EEG, is a test that measures a person's electrical brain waves. The test was first used by Hans Berger in 1924 to aid in understanding and diagnosing neurological conditions. The test is performed using approximately 27 electrodes, placed in pre-measured locations on your scalp and chest
Why might I need an EEG?
EEG testing is used to help understand, monitor and diagnose many conditions that can affect the brain such as seizures, epilepsy, memory problems, head injury, tumor(s), stroke, and demyelinating disease.
What to expect during an EEG
One of our highly-trained staff members will bring you into our procedure rooms. You will have approximately 25 electrodes placed on your scalp in pre-measured locations on the head and chest with conductive gel and tape or gauze. Once the electrodes are placed, the EEG Technologist will turn down the lights, and ask you to relax and close your eyes. The routine test lasts between 1.5-2 hours but a physician may request a longer exam.
During the exam the EEG Technologist will assess your EEG reactivity by giving you commands to follow, such as asking you to open and close your eyes, and by asking you questions related to time, place and person. Depending on your age and physical condition, the EEG Technologist will also measure your EEG reactivity against the strobe of a flashing light and by asking you to breath heavily for a few minutes. The remainder of the test will require you to be relaxed, still and to fall asleep if possible.
What happens after my EEG?
Once the test is over, the EEG Technologist will remove all the electrodes, gauze and tape from your scalp and chest. The EEG Technologist will use a warm, wet towel to remove the conductive gel from your hair and skin. You may see skin redness and mild skin irritation after the electrodes are removed. This will fade away after a few hours. The EEG Technologist will then show you back to the reception area and send your EEG Exam to the Neurologist. Your test results should be available to your care team within five business days.
How to prepare for your EEG
Arrive to the test with clean, dry hair. Do not use any hair products such as gel or hairspray on the day of your EEG. Try to refrain from consuming caffeinated drinks or food 8-12 hours before your test. Due to the length of the exam, it is good for patients to use the bathroom prior to going in to the procedure room.
