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            FAQ
      What is EEG?
 

EEG is the name commonly used for electroencephalography. Just like the ECG records the electrical activity of the heart, EEG records the electrical activity of the brain. It is safe and painless. Electrodes (small, metal, cup-shaped disks) are pasted to your scalp and record the electrical activity. They are connected to an EEG machine. The electrodes record the electrical activity. No electrical shocks are given during the test.

The EEG machine records your brain's electrical activity as a series of lines and the data is stored and analysed in a computer. It records from different regions of the brain. A video camera is also used during the EEG recording to correlate the changes in the EEG with your physical activities.

     What is the procedure for the EEG test?
 

Usually, the EEG will record your brain activity for 30 to 40 minutes. It takes about the same amount of time to prepare for the recording; so the entire procedure usually takes 1 to 1½ hours. However, depending on your condition, your doctor may request for a prolonged EEG recording of 8 or even 24 hours duration. The test is performed by a neurotechnologist. Electrodes are held in place by a paste that can be washed off easily when the test is over. The EEG is recorded in a quiet room, which often is dimly lit. The technologist may ask you to open and close your eyes several times, perform some simple calculation tasks, may shine flashing lights, or may ask you to breath deeply. If you have any symptoms of a seizure during the test, tell the technologist. It is preferable if you fall asleep during the recording as it may provide extra information.
After the EEG recording is done, the technologist will remove the electrodes from your scalp, and you can wash the paste out of your hair. The doctor usually reads the EEG after you have left and will tell you the results later.

     Are there any special instructions?
 
  • Clean the hair with soap or shampoo to remove oil or dirt
  • There are no food restrictions
  • Please do not sleep for more than 4 hours during the previous night
  • One relative or friend should accompany the patient
  • If you are taking any drugs, please continue them in the same dosage unless specifically instructed by your doctor.
     What can the EEG show?
 

The EEG may show patterns of normal or abnormal brain electrical activity. Abnormal activity may occur in a number of different conditions such as epilepsy, head trauma, stroke or brain tumour. Your doctor will look for abnormalities in the EEG and will interpret them according to your disease.

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