March 17 20:09 2019 Print This Article

Electroencephalogram is a technique used to measure electrical activity within the brain. Everyone’s brain gives off small amounts of electricity, though these are much weaker than the i’mpulses generated by the heart. Electroencephalogram (EEG) can detect brain elertrical discharge patterns that differ from normal. and can help in the diagnosis of a number of brain disorders. The test may be able to confirm or lucalise abnormalities that cannot be detected by x-ray or scanning. However, other tests may be needed to discover the cause.

EEG is performed as either an inpatient or an outpatient procedure in a special room that is insulated against noise. Patients are asked to shampoo their hair (but not apply conditioner, spray or oil) the night before the test so that the electrodes can make good contact with the scalp. Between 16 and 30 electrodes are pasted in various positions on the scalpas the patient lies face up on a bed or reclining chair and sleeps or rests with closed eyes. The elec-trodes amplify the brain’s electrical impulses and convert them into signals that are recorded on a moving strip of paper. The procedure is harmless and painless, and usually takes about go minutes. After the test it is necessary to brush and wash hair to remove all the paste.

What are the benefits of this test?

  • This test helps your health care provider diagnose certain medical conditions.

How to prepare for the test?

  • You will need to wash your hair the night before the test.
  • Do not use any oils, sprays, or conditioner on your hair before this test.
  • Do not eat or drink foods that have caffeine (such as coffee, tea, cola, and chocolate) for 8 hours before the test.
  • Sometimes it is necessary to sleep during the test, so you may be asked to reduce your sleep time the night before.

Why the test is performed?

  • Diagnose the presence and type of seizure disorders.
  • To look for causes of confusion.
  • To evaluate head injuries, tumors, infections, degenerative diseases, and metabolic disturbances that affect the brain.


  • An electroencephalogram is a safe procedure.
  • In rare cases, certain people with epilepsy may experience seizures from the flashing lights or the hyperventilating they have to do during the procedure.
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