Quick Answer: What Happens If EEG Is Abnormal?

What does an abnormal EEG look like?

The electrical impulses in an EEG recording look like wavy lines with peaks and valleys.

These lines allow doctors to quickly assess whether there are abnormal patterns.

Any irregularities may be a sign of seizures or other brain disorders..

What is a drawback of having an EEG scan?

One of the big disadvantages of EEG/ERP is that it’s hard to figure out where in the brain the electrical activity is coming from. By putting lots of electrodes all over the scalp (in our lab we use 64 or 128 electrodes), we can get some idea of where the ERP components are strongest.

What does a seizure feel like?

Focal seizures without loss of consciousness. These seizures may alter emotions or change the way things look, smell, feel, taste or sound, but you don’t lose consciousness. You may suddenly feel angry, joyful or sad. Some people have nausea or unusual feelings that are difficult to describe.

What does a spike on an EEG mean?

sharp wavesSpikes or sharp waves are terms commonly seen in EEG reports. If these happen only once in a while or at certain times of day, they may not mean anything. If they happen frequently or are found in specific areas of the brain, it could mean there is potentially an area of seizure activity nearby.

What is Jeavons syndrome?

Epilepsy with Eyelid Myoclonia, sometimes called Jeavons syndrome, is a rare form of epilepsy. It typically starts between 2-14 years (most between 6-8 years) and is more common in girls. The cause is unknown, but there is likely a genetic predisposition (tendency).

What causes slow brain activity?

Several different etiologies may provoke generalized background slowing, including the effects of sedative centrally acting medications, neurodegenerative disorders, a widespread neurodevelopmental process, hydrocephalus, metabolic or toxic encephalopathy, CNS infectious disorders such as meningoencephalitis, or even a …

What are the possible causes for an abnormal EEG?

Abnormal results on an EEG test may be due to:Abnormal bleeding (hemorrhage)An abnormal structure in the brain (such as a brain tumor)Tissue death due to a blockage in blood flow (cerebral infarction)Drug or alcohol abuse.Head injury.Migraines (in some cases)Seizure disorder (such as epilepsy)More items…•

What is abnormal brain activity?

Abnormal electrical activity in the brain can cause seizures. When a person has repeated seizures, this condition is called epilepsy. Diagnosis and treatment of these disorders often requires consultation with a neurologist.

What does a normal EEG rule out?

A normal EEG does not mean that you did not have a seizure. Approximately one-half of all EEGs done for patients with seizures are interpreted as normal. Even someone who has seizures every week can have a normal EEG test. This is because the EEG only shows brain activity during the time of the test.

Why would a neurologist order an EEG?

Why It’s Done Most EEGs are done to diagnose and monitor seizure disorders. EEGs also can identify causes of other problems, such as sleep disorders and changes in behavior. They’re sometimes used to evaluate brain activity after a severe head injury or before a heart transplant or liver transplant.

Can an MRI detect neurological disorders?

MRI is used to diagnose stroke, traumatic brain injury, brain and spinal cord tumors, inflammation, infection, vascular irregularities, brain damage associated with epilepsy, abnormally developed brain regions, and some neurodegenerative disorders.

Can EEG be wrong?

Yes, EEG can be bad for you. The consequences of being misdiagnosed with epilepsy are obvious and serious [9]. When the diagnosis is based largely on an abnormal EEG, no amount of subsequent normal EEGs will ‘cancel’ the previous abnormal one, and the wrong diagnosis is very difficult to undo.

What is happening in the brain during a seizure?

It consists of nerve cells that communicate with each other through electrical activity. A seizure occurs when part(s) of the brain receives a burst of abnormal electrical signals that temporarily interrupts normal electrical brain function.

What causes unusual brain activity?

Epilepsy is a central nervous system (neurological) disorder in which brain activity becomes abnormal, causing seizures or periods of unusual behavior, sensations, and sometimes loss of awareness. Anyone can develop epilepsy. Epilepsy affects both males and females of all races, ethnic backgrounds and ages.

Can an abnormal EEG mean nothing?

An abnormal EEG doesn’t automatically mean that you, for example, have epilepsy. The EEGs of babies and young children can often record irregular patterns that don’t mean anything, or the irregularities may flag previously diagnosed neurological conditions such as cerebral palsy.

Can doctors tell if you had a seizure?

Diagnosing the seizure To make a diagnosis, your doctor may perform or order: Complete neurological exam. Blood work and other lab tests to look for abnormalities in blood glucose and other factors. Imaging tests of the brain, such as an MRI or CT scan.

What can an EEG tell you about seizures?

An EEG is of value for diagnosing epilepsy only if it detects patterns typical of epilepsy. If it doesn’t detect the right patterns, you may still have epilepsy and ambulatory monitoring or video EEG may be necessary. EEG can also detect abnormal brain waves after a head injury, stroke, or brain tumor.

Can an EEG detect anxiety?

Increased communication between the amygdala and hippocampus appear to correlate with symptoms of depression and anxiety, in findings that may have treatment implications, new research suggests.