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What Is an EEG (Electroencephalography)?

EEG records the brain's electrical activity to help diagnose epilepsy and disorders of consciousness.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Radyoloji department. Book Appointment →

What is What Is an EEG (Electroencephalography)??

Electroencephalography (EEG) is a non-invasive neurophysiologic test that records the brain's electrical activity through electrodes placed on the scalp.

It is used in the assessment of epilepsy, encephalopathy, sleep disorders, and brain death. Video-EEG simultaneously records clinical and electrical findings during seizures.

Symptoms

History of epileptic seizure and seizure-type classification
Unexplained loss of consciousness or confusion episodes
Sleep disorders and parasomnia
Encephalitis or metabolic encephalopathy
Brain tumor and post-traumatic seizure investigation
Localization of seizure focus before epilepsy surgery

Risk Factors

EEG has no known risk; it is non-invasive
Hyperventilation and photic-stimulation provocation rarely cause side effects
Hair conditioner and gel can disrupt electrode contact
Patient compliance issues with sleep-deprived studies
A normal EEG does not exclude epilepsy; repeat studies may be required
Artifacts (eye movement, muscle) can complicate interpretation

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • After a first seizure, an EEG must be planned by a neurologist
  • Wash your hair before the EEG; do not apply gel or cream
  • For sleep EEG you may be asked to sleep less the previous night
  • Always discuss results with a neurology specialist

Treatment Methods

01
EEG is a diagnostic tool; treatment is planned by the neurologist
02
Antiepileptic drug selection in epilepsy is guided by EEG type
03
Pre-surgical EEG focus mapping is performed in refractory epilepsy
04
Specific treatment is directed at the cause in encephalopathy
05
Periodic EEG monitoring is used to follow treatment response

Which Department to Visit?

You can visit our Radyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.