By: RS Abdi Waluyo
What is Electroencephalography (EEG)?
Electroencephalography (EEG) is a non-invasive diagnostic test used to record the electrical activity of the brain. Small electrodes are placed on the scalp to detect and measure the electrical signals produced by brain cells.
EEG helps doctors evaluate brain function and supports the diagnosis and monitoring of various neurological conditions.
How Does EEG Work?
During the examination, small electrodes are attached to the scalp using a special adhesive or cap. These electrodes record the brain’s electrical activity, which is displayed as wave patterns for interpretation by a neurologist.
The procedure is painless and typically takes 20–60 minutes, depending on the type of EEG being performed.
What Conditions Can EEG Help Diagnose?
EEG is commonly used to evaluate and monitor conditions such as:
- Epilepsy and seizures
- Unexplained episodes of loss of consciousness
- Sleep disorders, including certain sleep-related conditions
- Brain injuries
- Brain infections or inflammation
- Brain tumors
- Brain dysfunction following a stroke
- Brain activity monitoring in critically ill patients
Benefits of EEG
EEG offers several important advantages:
- Non-invasive: No surgery or needles are required.
- Radiation-free: Uses electrodes to record electrical activity without radiation exposure.
- Direct assessment of brain activity: Provides real-time information about the brain’s electrical function.
- Supports diagnosis and treatment planning: Helps identify neurological disorders and monitor treatment effectiveness.
- Can be repeated safely: Suitable for ongoing monitoring when needed.
What to Expect During an EEG
Before the examination, patients are usually advised to wash their hair and avoid using hair products such as gels, oils, or sprays.
During the procedure:
- The patient sits or lies comfortably.
- Electrodes are attached to the scalp.
- Brain activity is recorded while the patient relaxes.
- In some cases, the patient may be asked to open and close their eyes, breathe deeply, or look at flashing lights to obtain additional diagnostic information.
Most patients can return to their normal activities immediately after the examination unless otherwise advised by their doctor.
Is EEG Safe?
Electroencephalography (EEG) is a safe and painless procedure. The electrodes only record the brain’s electrical activity—they do not deliver electricity into the body.
For patients with epilepsy, certain parts of the examination, such as flashing lights or deep breathing, may trigger a seizure. If this occurs, the procedure is performed under the supervision of trained medical professionals.
Why is EEG Important?
EEG provides valuable information about brain function that cannot be obtained from imaging tests such as CT scans or MRI.
The results help doctors diagnose neurological disorders, determine the cause of symptoms, monitor treatment response, and develop the most appropriate care plan.
With advanced diagnostic technology and experienced neurologists, Electroencephalography (EEG) plays an important role in the diagnosis and management of a wide range of neurological conditions.
