Epilepsy - overview

Definition

Epilepsy is a brain disorder in which a person has repeated seizures over time. Seizures are episodes of uncontrolled and abnormal firing of brain cells that may cause changes in attention or behavior.

Alternative Names

Seizure disorder; Epileptic - epilepsy

Causes

Epilepsy occurs when permanent changes in the brain cause it to be too excitable or irritable. As a result, the brain sends out abnormal signals. This leads to repeated, unpredictable seizures. (A single seizure that does not happen again is not epilepsy.)

Epilepsy may be due to a medical condition or injury that affects the brain. Or the cause may be unknown (idiopathic).

Common causes of epilepsy include:

Epileptic seizures usually begin between ages 5 and 20. There is also a higher chance of seizures in adults older than 60. But epileptic seizures can happen at any age. There may be a family history of seizures or epilepsy.

Symptoms

Symptoms vary from person to person. Some people may have simple staring spells. Others have violent shaking and loss of alertness. The type of seizure depends on the part of the brain that is affected.

Most of the time, the seizure is similar to the one before it. Some people with epilepsy have a strange sensation before each seizure. Sensations may be tingling, smelling an odor that is not actually there, or emotional changes. This is called an aura.

Your doctor can tell you more about the specific type of seizure you may have:

Exams and Tests

The doctor will perform a physical exam. This will include a detailed look at the brain and nervous system.

An EEG (electroencephalogram) will be done to check the electrical activity in the brain. People with epilepsy often have abnormal electrical activity seen on this test. In some cases, the test shows the area in the brain where the seizures start. The brain may appear normal after a seizure or between seizures.

To diagnose epilepsy or plan for epilepsy surgery, you may need to:

Tests that may be done include:

Head CT or MRI scan is often done to find the cause and location of the problem in the brain.

Treatment

Treatment for epilepsy includes taking medicines, lifestyle changes, and sometimes surgery.

If epilepsy is due to a tumor, abnormal blood vessels, or bleeding in the brain, surgery to treat these disorders may make the seizures stop.

Medicines to prevent seizures, called anticonvulsants (or antiepileptic drugs), may reduce the number of future seizures:

Many epilepsy drugs may affect the health of your bones. Talk to your doctor about whether you need vitamins and other supplements.

Epilepsy that does not get better after 2 or 3 anti-seizure drugs have been tried is called "medically refractory epilepsy." In this case, the doctor may recommend surgery to:

Some children are placed on a special diet to help prevent seizures. The most popular one is the ketogenic diet. A diet low in carbohydrates, such as the Atkins diet, may also be helpful in some adults. Be sure to discuss these options with your doctor before trying them.

Lifestyle or medical changes can increase the risk for a seizure in adults and children with epilepsy. Talk with your doctor about:

Other considerations:

Support Groups

The stress of having epilepsy or being a caretaker of someone with epilepsy can often be helped by joining a support group. In these groups, members share common experiences and problems.

Outlook (Prognosis)

Some people with epilepsy may be able to reduce or even stop their anti-seizure medicines after having no seizures for several years. Certain types of childhood epilepsy go away or improve with age, usually in the late teens or 20s.

For many people, epilepsy is a lifelong condition. In these cases, anti-seizure drugs need to be continued. There is a very low risk for sudden death with epilepsy.

Possible Complications

Complications may include:

When to Contact a Medical Professional

Call your local emergency number (such as 911) if:

In the case of someone who has had seizures before, call 911 for any of these emergency situations:

Call your doctor if any new symptoms occur:

Prevention

There is no known way to prevent epilepsy. Proper diet and sleep, and staying away from alcohol and illegal drugs may decrease the likelihood of triggering seizures in people with epilepsy.

Reduce the risk for head injury by wearing a helmet during risky activities. This can lessen the likelihood of a brain injury that leads to seizures and epilepsy.

References

Abou-Khalil BW, Gallagher MJ, Macdonald RL. Epilepsies. In: Daroff RB, Jankovic J, Mazziotta JC, Pomeroy SK, eds. Bradley's Neurology in Clinical Practice. 7th ed. Philadelphia, PA: Elsevier; 2016:chap 101.

Morris GL III, Gloss D, Buchhalter J, Mack KJ, Nickels K, Harden C. Evidence-based guideline update: vagus nerve stimulation for the treatment of epilepsy: report of the Guideline Development Subcommittee of the American Academy of Neurology. Neurology. 2013;81:1453-1459. PMID: 23986299 www.ncbi.nlm.nih.gov/pubmed/23986299.

Wiebe S. The epilepsies. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 403.



Review Date: 2/27/2016
Reviewed By: Amit M. Shelat, DO, FACP, Attending Neurologist and Assistant Professor of Clinical Neurology, SUNY Stony Brook, School of Medicine, Stony Brook, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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