EEG (Electroencephalogram)

The electroencephalogram (EEG) is a diagnostic test used to record the electrical activity of the brain. The brain continuously produces electrical signals, and an EEG test captures these signals through small electrodes placed on the scalp. This helps in understanding how the brain is functioning and whether there are any abnormal patterns in its activity.

EEG is a safe and non-invasive procedure that provides valuable information about brain function. It is widely used in the evaluation of various neurological conditions, especially those related to abnormal brain activity. The test helps in identifying changes in brain waves that may not be visible through other imaging methods.

When is an EEG Recommended?

An EEG may be advised when symptoms suggest abnormal brain activity or neurological dysfunction. It plays an important role in evaluating and monitoring several brain-related conditions.

• Episodes of seizures or suspected epilepsy
• Unexplained loss of consciousness or fainting
• Sudden confusion or memory disturbances
• Sleep-related disorders
• Monitoring brain activity in known neurological conditions

During the EEG procedure, electrodes are placed on the scalp to record brain wave patterns. The test is painless and usually takes a short time to complete. In some cases, specific instructions such as sleep deprivation or stimulation may be used to capture more accurate results. These methods are formally known as “activation procedures.” Occasionally, long-term EEG of 45 minutes or more and video EEG may be required to capture the diagnosis, with a necessity to record the events in a few cases.

EEG findings help in understanding the nature of brain activity and support clinical diagnosis. It is often used along with other investigations to provide a complete neurological evaluation.

Role of EEG in Neurological Diagnosis

EEG plays a key role in diagnosing and managing conditions related to brain function. It is especially useful in detecting seizure disorders and differentiating between various types of epilepsy. The test can also help assess brain activity in other neurological conditions where electrical patterns are affected. By analyzing the pattern, frequency, and location of electrical activity, EEG helps identify abnormalities and their origin within the brain. This information is important in classifying seizure types, guiding treatment decisions, and assessing the risk of recurrence.