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Slide background Electroencephalogram — EEG

WHAT IS EEG?

EEG measures brainwave activity to evaluate brain dysfunction using safe and painless electrodes (flat metal discs) affixed to your scalp.

 

HOW DOES IT WORK?

During the EEG, your brain cells actively transmit electrical impulses, even while you sleep. Through the electrodes, these impulses are recorded as wavy lines on an EEG recording. EEG is safe and painless, as the electrodes don’t transmit any sensations. They just record brainwaves. Sometimes seizures are intentionally triggered in patients and medically monitored carefully.

 

WHAT WILL I LEARN FROM AN EEG?

The EEG recording detects changes in normal brain activity. EEG is the primary diagnostic test for Epilepsy and other seizure disorders, as well as a means to detect brain disorders. It does not measure intelligence or detect mental illness.

 

SYMPTOMS

  • Headaches
  • Seizures
  • Memory Loss

 

EEG CAN HELP DIAGNOSE…

  • Brain dysfunction (encephalopathy)
  • Brain tumors
  • Concussions and head injuries
  • Dementia
  • Epilepsy or other seizure disorder
  • Help determine brain activity in coma patients
  • Inflammation of the brain (encephalitis)
  • Primary test for diagnosing Epilepsy or other seizure disorders
  • Sleep disorders
  • Stroke

 

PREPARATION

  • Follow explicit doctor instructions
  • Wash your hair the day or night before your appointment, but do not use conditioners or any other hair products to enable the electrodes to properly adhere to the scalp
  • Avoid caffeine on test day, as it can hinder the results
  • Take your usual medications unless instructed otherwise

 

 

WHAT TO EXPECT

EEG typically takes about 60 minutes. Sleep disorders may require more extensive testing at longer durations. A technician will place an elastic cap fitted with electrodes on your head. The technician will then clean the surface of each arm and behind the ears, and put gel into the cap’s holes. The electrodes are connected with wires to an instrument that will amplify and record the brainwave activity on a computer.

During most of the test, you will be in a relaxed position with your eyes closed. At various times during the test, the technician may ask you to open and close your eyes, breathe deeply (hyperventilate) for a few minutes, or look at a flashing light.

It is customary to video record the EEG procedure to capture your body motions simultaneously with the brain waves, which can help the doctor diagnose and treat your condition.

 

AFTER THE EEG

You should not feel any side effects and be able to return to normal activity following the test. If you were given a sedative during the procedure, please arrange for transportation home following your appointment.