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Overview

The EEG test may be requested by your physician for diagnosing the following:

  • Epilepsy or other seizure disorders
  • Brain tumour
  • Head injury
  • Brain dysfunction that may have a variety of causes (encephalopathy
  • Inflammation of the brain (encephalitis)
  • Stroke
  • Sleep disorders
  • Dementia

Electroencephalogram (EEG)

What is it : An EEG records the electrical activity that arises from the brain. Several external electrodes are placed on your scalp. These record the electrical impulses emanating from different centres or areas of your brain that are picked up by the electrodes and transmitted to a polygraph. This is a machine that produces separate graphs on a computer screen. This is then interpreted by your doctor.

Video EEG

What it is : As the name suggests, Video EEG is an EEG performed while the process is videotaped. A Video EEG typically takes several hours and sessions may continue for a few days. It may be performed on an outpatient basis or in severe cases on inpatients.

Why is it done : A Video EEG allows the doctor to observe an individual during a seizure. Just like the electrical signals, the individual's presentation too offers clues to the disorder, its exact nature and severity. Together, this helps make a precise and accurate diagnosis. A video picks up seizure activity when the patient is clinical experiencing a seizure. This technique when combined with an "Ictal SPECT" procedure can add immense value to localization of a seizure.

These are completely painless and non invasive tests and can be done on children and adults safely.

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