Special Testing

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» Electroencephalography (EEG)

Electroencephalography

What is Electroencephalography (EEG)?

Electroencephalography (EEG) is the diagnostic field devoted to testing the central nervous system. It involves the recording and evaluation of spontaneous evoked electrical activity from the brain through surface disk electrodes attached to your scalp with a conductive, adhesive cream. During the test, you will lie in a prone position. Every effort is made to make you comfortable and relaxed in a quiet environment. During the recording stage of your test, you will be asked to complete various tasks, such as opening and closing your eyes, or hyperventilating for about four minutes. Your hair will be cleaned after the test has been completed. A doctor must order an EEG, and we ask that if you have been given a requisition form from your doctor, you bring it with you. Informative patient leaflets are provided, for additional information.

Why did my doctor order this test?

EEGs can be useful in helping to diagnose patients with central nervous system (CNS) disorders. Some of these disorders include epilepsy, brain tumours, migraine headaches, or head injuries. Sleep activation techniques are valuable in patients suspected of having seizures. Sleep activation techniques can also provide additional information in patients who have abnormalities in their waking EEG.

How should I prepare for this test?

• Please arrive 15 minutes before your appointment, so that our receptionist can register you.
• You should arrive with clean, dry hair.
• You can take your usual medication and meals prior to the test.
• Your doctor may have ordered medication as well as sleep deprivation. If this is the case, she/he will tell you to go to bed at approximately 11:00 p.m., awaken at 2:00 a.m., and stay awake until you come to the lab. She/he will leave a prescription for you at the pharmacy. There is a small dispensing fee. We will give you the medication when you arrive at the laboratory. You must not drive after the test, and it is best if you are accompanied at this time.
• Children receiving the test should be kept awake late the night before, and woken a few hours earlier than usual so that they have several hours less sleep. This helps the child to lie still, and often the child will fall asleep. Please keep the child from napping prior to the test.
• Be prepared to give a brief history of your health and symptoms.
• Bring a list of your medications and allergies.
• If you do not speak English, please bring a family member who will be able to interpret for you.

How long will the test take?

The test is painless, and a routine procedure for an adult will take approximately 60 minutes. For young children and newborns, the test will last approximately 90 minutes. Sleep activation and deprivation techniques also last approximately 90 minutes.

Why should I have this test done at the hospital?

Our program provides inpatient and outpatient services for adults, adolescents, children, and newborns. Our allied fields include neurology, paediatric neurology, neurosurgery, psychiatry, and the basic neurosciences. Our team is able to meet each new or expanded program within the hospital, and we strive to provide you with the best, most comfortable care.

When will I get the test results?

Please be aware that the technologist is not allowed to give you the results of your test. The report will be interpreted, and a copy will be sent to your family doctor within seven to ten days.