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Epilepsy | American Clan of Neurological Surgeons

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Epilepsy is a disorder of the brain characterized by repeated seizures. A seizure is normally divers as a sudden alteration of behavior due to a temporary alter in the electrical functioning of the brain. Normally, the brain continuously generates tiny electrical impulses in an orderly pattern. These impulses travel along neurons — the network of nerve cells in the brain — and throughout the whole body via chemical messengers called neurotransmitters.

In epilepsy the brain's electric rhythms have a trend to become imbalanced, resulting in recurrent seizures. In patients with seizures, the normal electrical pattern is disrupted by sudden and synchronized bursts of electric energy that may briefly affect their consciousness, movements or sensations.

Epilepsy is normally diagnosed afterwards a person has had at least two seizures that were non acquired by some known medical condition, such as booze withdrawal or extremely low blood sugar.

If seizures arise from a specific area of the brain, then the initial symptoms of the seizure oft reflect the functions of that area. The right half of the brain controls the left side of the torso, and the left half of the brain controls the correct side of the torso. For example, if a seizure starts from the right side of the brain in the area that controls movement in the thumb, so the seizure may begin with jerking of the left thumb or paw.

Seizures vary then much that epilepsy specialists oft re-classify seizure types. Typically, seizures belong in one of 2 basic categories: main generalized seizures and partial seizures. The difference between these types is in how they brainstorm. Primary generalized seizures begin with a widespread electrical belch that involves both sides of the brain at one time. Fractional seizures begin with an electrical discharge in i limited area of the brain.

Epilepsy in which the seizures begin from both sides of the brain at the same time is called master generalized epilepsy. Hereditary factors are important in fractional generalized epilepsy, which is more likely to involve genetic factors than partial epilepsy — a status in which the seizures ascend from a limited expanse of the brain.

Some partial seizures are related to head injury, brain infection, stroke or tumor just, in most cases, the crusade is unknown. 1 question that is used to further classify fractional seizures is whether consciousness (the ability to respond and remember) is dumb or preserved. The difference may seem obvious, merely there are many degrees of consciousness harm or preservation.

The following factors may increase the risk of seizures in people predisposed to seizures:

• Stress
• Sleep deprivation or fatigue
• Insufficient food intake
• Booze use or drug abuse
• Failure to accept prescribed anticonvulsant medications

About one-half of the people who accept one seizure without a clear cause volition have another i, usually inside 6 months. A person is twice as likely to accept another seizure if there is a known brain injury or other type of encephalon abnormality. If the patients does have 2 seizures, there is well-nigh an eighty percent hazard of having more. If the first seizure occurred at the time of an injury or infection in the brain, it is more probable the patient volition develop epilepsy than if the seizure did not happen at the time of injury or infection.

Co-ordinate to the Epilepsy Foundation, epilepsy affects three one thousand thousand people in the U.Southward. and 50 million worldwide. Epileptic seizures may be tied to a brain injury or genetics, but for lxx percent of epilepsy patients, the cause is unknown. The Epilepsy Therapy Projection notes that 10 percentage of people will have seizures in their lifetime.

Epilepsy affects more than 300,000 children under the age of 15 — and more 90,000 immature people in this grouping accept seizures that cannot be adequately treated. The onset rate starts to increase when individuals age, peculiarly as they develop strokes, brain tumors or Alzheimer'southward disease, all of which may cause epilepsy. Reports signal that more than 570,000 adults over the age of 65 suffer from the disorder.

More men than women take epilepsy. Children and adolescents are more than likely to have epilepsy of unknown or genetic origin. Brain injury or infection can cause epilepsy at any historic period. The Epilepsy Foundation too reports that seventy percent of children and adults with newly diagnosed epilepsy can be expected to enter remission after having gone 5 years or more without a seizure while on medication. In addition, 75 per centum of people who are seizure-complimentary on medication can be weaned from medication eventually. Co-ordinate to the National Institute of Neurological Disorders and Stroke, 20 percent of epilepsy patients have intractable seizures — seizures that do non respond to treatment.

The reasons why epilepsy begins are different for people of dissimilar ages. But what is known is that the cause is undetermined for well-nigh half of all individuals with epilepsy, regardless of age. Children may be born with a defect in the structure of their brain or they may suffer a head injury or infection that causes their epilepsy. Astringent head injury is the most common known crusade in young adults. For centre-age individuals, strokes, tumors and injuries are more frequent catalysts. In people historic period 65 and older, stroke is the most common known cause, followed by degenerative conditions such as Alzheimer's disease. Frequently, seizures do not begin immediately afterwards a person has an injury to the encephalon. Instead, a seizure may occur many months later.

• Premature nascency or low birth weight
• Trauma during birth (such every bit lack of oxygen)
• Seizures in the offset calendar month of life
• Abnormal brain structures at birth
• Bleeding into the brain
• Aberrant blood vessels in the brain
• Serious brain injury or lack of oxygen to the brain
• Brain tumors
• Infections of the encephalon such as meningitis or encephalitis
• Stroke resulting from blockage of arteries
• Cerebral palsy
• Mental disabilities
• Seizures occurring within days later on head injury
• Family history of epilepsy or fever-related seizures
• Alzheimer's disease (late in the affliction)
• Lengthy fever-related (febrile) seizures
• Alcohol or drug abuse

A doctor makes his or her epilepsy diagnosis based on symptoms, physical signs and the results of such tests as an electroencephalogram (EEG), computed tomography (CT or True cat scan) or magnetic resonance imaging (MRI).

It is essential that the type of epilepsy and the type of seizures both are diagnosed properly. There are several major classifications of seizures and nearly are associated with specific forms of the disorder.

Epilepsy may be treated with antiepileptic medications (AEDs), diet therapy and surgery. Medications are the initial handling choice for almost all patients with multiple seizures. Some patients who only have a single seizure and whose tests do not point a high likelihood of seizure recurrence may not demand medications. The medications treat the symptoms of epilepsy (the seizures), rather than curing the underlying condition. They are highly effective and completely command seizures in the majority (approximately lxx%) of patients. The drugs preclude seizures from starting by reducing the tendency of brain cells to transport excessive and confused electrical signals.

With many different antiepileptic drugs currently available, choosing the correct medication for an individual patient has get complicated. Choice of medication depends on a variety of factors, some of which include the blazon of seizure and blazon of epilepsy, the likely side effects of the medication, other medical conditions the patient may accept, potential interactions with the patient's other medications, historic period, gender and cost of the medication.

Earlier whatsoever drug is prescribed, patients should discuss potential benefits, side effects and risks with their doctors.

Nutrition therapy may exist utilized in some patients with specific forms of epilepsy. The nigh mutual diets utilized are the ketogenic nutrition and the modified Atkins diet. The ketogenic diet is a special high-fat, adequate poly peptide and low saccharide nutrition that is initiated over 3 to four days in the hospital. The modified Atkins diet is similar to the ketogenic diet but is slightly less restrictive. It can be initiated equally an outpatient. Both diets have been shown to reduce seizures in approximately half the patients that are identified to be advisable candidates. These are mainly children with refractory epilepsy who are not surgical candidates.

While approximately 70 percent of patients have well-controlled seizures with these modalities, the remaining 30 percent practice not and are considered medically-resistant. Patients with medically-resistant epilepsy are often treated at specialized epilepsy centers in a multi-disciplinary fashion.

The team of trained specialists that collaborate to provide these patients with comprehensive diagnosis and treatment of epilepsy may include:

• Adult epileptologists
• Pediatric epileptologists
• Epilepsy nurse practitioners
• Epilepsy neurosurgeons
• EEG technicians
• Clinical neuropsychologists
• Psychiatrists
• Neuroradiologists
• Nuclear medicine radiologists
• Dietitians
• Neuroscience nurses

In patients whose seizures are medically resistant, surgery provides the best hazard of consummate control of seizures. However, not all patients with refractory epilepsy are suitable candidates for surgery. In improver to being refractory, they need to take partial, rather than generalized epilepsy (i.due east. their epilepsy arises from a unmarried part of the encephalon, rather than from both sides or from all over the brain).

Furthermore, the epileptic region should be in a part of the encephalon that, if removed, is unlikely to event in major neurological complications. Whether or not patients are probable to benefit from surgery is determined by detailed testing (pre-surgical evaluation).

Pre-surgical evaluation consists of a one- or 2-phase process to determine if surgery is the best pick and can provide good seizure command with minimal risk. Phase I involves all non-invasive (non-surgical) tests. Phase II testing involves invasive tests (requires surgery) that are used in select patients.

Not every patient requires every test bachelor in the Phase I evaluation. Adult and pediatric epilepsy patients are evaluated by epileptologists who decide the necessary and appropriate tests on an individualized ground. The following tests may be required in the phase I evaluation:

This is the initial exam performed in every patient and is usually washed as an outpatient process (pictured hither). Information technology is used not only to diagnose epilepsy, but also to determine if the epileptic seizures are coming from a small-scale office of the brain (partial seizures), or all over the brain ( generalized).

Although most patients practise not have seizures when the EEG is beingness recorded, they often take abnormal brain activity in the EEG (spikes or sharp waves) that indicates they take a tendency to have seizures. The location of this activeness allows the doctor to determine whether patients have partial or generalized seizures.

This is the most of import pre-surgical test and is performed with electrodes attached to the scalp (noninvasive monitoring). Patients are admitted to the infirmary for several days and the purpose is to record seizures with simultaneous video and EEG. All the data are analyzed past a trained epileptologist. Detailed assay of the symptoms during seizures as well every bit the location of EEG changes during seizures (ictal EEG onset), and abnormalities noted in betwixt seizures (interictal), indicate the probable location where seizures originate within the brain.

This may detect an aberration that could be the cause of the epilepsy (lesional epilepsy) or may exist normal (non-lesional epilepsy). With more powerful MRI machines and use of special protocols and software, subtle encephalon abnormalities are increasingly beingness identified.

PET scans wait at the metabolic action of the encephalon and permit physicians to determine if the brain is functioning normally. In patients with epilepsy, decreased encephalon function is seen in the region where seizures originate, when the patient is not actually having a seizure. On the other hand, if the patient has a seizure during the examination, increased brain part is seen. PET scan may show abnormalities even if the encephalon MRI is normal. PET scans are usually washed in the outpatient setting.

When a person has a seizure, an increased amount of blood flows to the brain region where the seizure begins. SPECT scans performed during seizures tin can identify the brain region where claret flow increases and thus indicate where they begin. SPECT scans are performed when the patient is admitted to the hospital for video-EEG monitoring.

Neuropsychological evaluation, functional MRI: Neuropsychological evaluation and functional MRI are used to assess cognitive functions, peculiarly linguistic communication and memory function prior to surgery, to meet which side of the brain is ascendant for language and to determine if there is decreased memory part in the epileptic region. This allows prediction of cognitive deficits after surgery. Functional MRI (fMRI) measures blood flow changes in areas of the encephalon during the performance of specific cerebral tasks.

This test involves the injection of a medication such as sodium amobarbital or methohexital into 1 carotid artery at a fourth dimension and is performed in selected cases. The medication causes temporary (1-5 minutes) paralysis of one half of the brain allowing independent testing of language and retention office in the other one-half. This examination is also used to predict mail service-operative deficits in language and memory function.

Results of video-EEG monitoring are compared with those obtained from the other tests to meet if they all point to the same region of the brain as beingness the origin of epileptic seizures. If all the test results are concordant, the patient is likely to be a practiced surgical candidate. Thus, the Stage I evaluation is designed to find the area of the brain that is likely to exist generating the seizures (the focus), to determine if that area tin be safely removed, and predict what kind of consequence might be expected with regard to seizure reduction or seizure freedom.

After the Phase I evaluation, the epilepsy team meets to hash out patient management options in a multi-disciplinary setting to individualize treatments. At that time, based on the results of the Stage I evaluation, patients may be deemed good or poor surgical candidates. In some cases, it may exist unclear and more testing is needed. This additional testing is called Phase 2 evaluation and is performed in select cases, where despite all prior tests, the seizure focus is non defined well plenty for surgical treatment.

Phase 2 evaluation involves video-EEG monitoring with electrodes that are placed inside the skull (invasive monitoring). As there is more risk from invasive monitoring, the conclusion about the necessity for a Phase Ii evaluation is usually fabricated by the epilepsy squad as a whole and discussed in particular with the patient.

There are several surgical implantation options. Each involves the implantation of electrodes either on the surface of the brain, or inside the brain. The do good of these electrodes is that they are closer to the expanse producing the seizures than those placed but on the scalp. After surgical placement of electrodes, the patients are transferred to the epilepsy monitoring unit and epileptologists perform video- EEG monitoring in a like fashion to the stage I monitoring.

The electrode types and implantation arrays differ and may include:

A subdural electrode filigree is a thin sail of cloth with multiple pocket-sized (couple millimeters in size) recording electrodes implanted within it. These are placed directly on the surface of the brain and have the reward of recording the EEG without the interference of pare, fat tissue, musculus and bone that may limit scalp EEG. Shapes and sizes of these sheets are called to best conform to the surface of the brain and the surface area of interest.

These are small wires which are implanted within the encephalon itself. Each wire has electrodes which surround information technology. These electrodes are able to tape brain activity along the entire length of the implanted wire. They have the reward of recording activity from structures deeper in the brain. They can be implanted through minor skin pokes.

In a number of instances, information technology is benign to implant a combination of subdural electrodes and depth electrodes.

Increasingly common, invasive monitoring may be done using the stereoelectroencephalography approach (stereoEEG). With this approach, multiple depth electrodes are implanted in a specific design that is individualized to the patient. The three-dimensional infinite which is covered past the depth electrodes is designed to comprehend the seizure focus.

This is usually performed in patients with implanted subdural electrodes while they are in the EMU. After a sufficient number of seizures are recorded, cursory electric stimulation is provided through each electrode separately to determine the normal function of the part of the brain underneath the electrode. This is painless. The purpose is to map out critically important areas of the brain such every bit those necessary for motor, sensory and language functions and to make up one's mind if there is whatsoever overlap with the seizure-generating regions. This allows tailoring of surgical resections to minimize the run a risk of major neurological deficits after surgery.

Surgery for the treatment of epilepsy involves resection, disconnection, stereotactic radiosurgery or implantation of neuromodulation devices. Inside these categories, there are multiple options depending on the clinical scenario.

Surgical resection (removal of aberrant tissue) for epilepsy may fall into the following broad categories:

Lesionectomy
A lesion is a generic term for brain abnormalities that prove up on imaging. Some types of lesions — such as cavernous malformations (blood vessel abnormality) and tumors — are prone to cause seizures. When the pre-operative testing indicates that these lesions are the cause of the epilepsy, they can be removed surgically.

Lobectomy
Each hemisphere, or half, of the brain is divided into iv principal lobes — the frontal, temporal, parietal and occipital. Seizures may arise within any of the lobes. A lobectomy is an functioning to remove a lobe of the brain. Removal of ane of the temporal lobes — called a temporal lobectomy — is the most mutual blazon of epilepsy surgery performed. Other types of lobectomies may rely on more specialized testing and surgery to bear witness a lack of vital function (such every bit voice communication, memory, vision, motor part).

Multilobar resection
A multilobar resection involves removal of parts or all of two or more than lobes of the brain. It is reserved for more than widespread abnormalities causing seizures, providing that no vital functions are in those regions.

Hemispherectomy
The brain is divided into a left and right hemisphere. In rare instances, children may have severe, uncontrollable and devastating seizures that tin can exist associated with weakness on i side of the body. This may occur with a big amount of damage or injury to one of the hemispheres. Surgery to remove or disconnect a hemisphere, a hemispherectomy may be curative. There are many subtypes of this surgery, the two main divisions existence anatomic and functional hemispherectomy. Anatomic hemispherectomy involves removing the entire one-half of the brain that is injured and is generating the debilitating seizures. This includes the iv lobes of the hemisphere — frontal, temporal, parietal and occipital. Functional hemispherectomy involves separating the aberrant hemisphere from the normal one past disconnecting fibers that communicate between the two. Oftentimes, some portions of the aberrant brain are surgically removed in guild to perform this disconnection.

Functional hemispherectomy
Functional hemispherectomy involves separating the abnormal hemisphere from the normal ane by disconnecting fibers that communicate between the two. Often, some portions of the abnormal brain are surgically removed in order to perform this disconnection. This is, very often, surgically curative.

Surgical disconnection
These surgeries involve cutting and dividing fiber bundles that connect portions of the brain. The rationale is to carve up the surface area of the brain generating the seizures from the normal brain.

Corpus callosotomy
The corpus callosum is one of the main fiber bundles that connect the two hemispheres. When debilitating generalized seizures or falling-type seizures start on ane side of the encephalon and speedily spread to the other, patients may be candidates for this process. A large part of this fiber packet may be cut. The procedure is palliative, meaning that although seizures may meliorate, they usually do non disappear.

Multiple subpial transections (MST)
In certain cases of epilepsy, where the seizures are deemed to be arising from an surface area of the brain that cannot exist safely removed, multiple subpial transections tin can exist performed. In this procedure, a small wire is placed into the brain to perform transections at multiple points in a given region which tin can decrease seizures by disconnecting the cross-communication of neurons.

Stereotactic radiosurgery
Stereotactic radiosurgery involves the delivery of a focused beam of radiations to a specific target area. Gamma Knife radiosurgery, one of the virtually common forms of radiosurgery, uses gamma rays to target the area to be treated. In epilepsy, it is generally reserved for small, deep-seated lesions that are visible on MR imaging.

Neuromodulation
In that location are currently two FDA-canonical devices that modulate the nervous system with the goal of improved seizure control. This includes vagus nerve stimulation and responsive neurostimulation. Both devices are considered palliative in that the goal is improved seizure control, and rarely do patients become seizure free.

Vagus nerve stimulation
The vagus nerve stimulator (VNS) is an FDA-approved device for the handling of epilepsy that is not controlled with antiepileptic medications. It involves the surgical placement of electrodes around the vagus nerve in the neck and a generator placed beneath the neckband bone in the upper chest region. Information technology requires two split up incisions, just is an outpatient procedure. Afterward, a developer can exist used past the epileptologist (from outside the skin) to alter the intensity, duration and frequency of stimulation to optimize seizure command. VNS decreases seizure frequency by at to the lowest degree one-half in forty to l percent of patients, but rarely eliminates all seizures. Information technology is an selection for those who are not candidates for other types of surgery.

Responsive neurostimulation (RNS)
The NeuroPace responsive neurostimulation (RNS) device was approved by the FDA in 2014 as a treatment for adults with partial-onset seizures with i or two seizure onset-zones, whose seizures accept not been controlled with two or more than antiepileptic drugs. Surgery involves placing a neurostimulator in the skull and connecting to 2 electrodes that are placed either on the surface or into the brain, in or around the expanse which is accounted to be the probable onset region for the seizure. The device records brain waves (EEG), and is trained by the epileptologist to detect the electrical signature of the seizure onset and then deliver an impulse which can cease the seizure. Information nerveless past the neurostimulator tin by uploaded by the patient with the utilise of a hand-held wand to a secure web-based awarding which tin be accessed by the epileptologist. This surgery is generally reserved for patients who are not a candidate for surgical resection, since the RNS improves seizure control just rarely stops seizures from occurring.

Improved technology and testing has fabricated it possible to identify more accurately where seizures originate in the brain (epileptogenic regions), and advances in surgery have made operative management safer for all forms of surgery for epilepsy. Of the surgeries presented, surgical resection offers the best risk of rendering a patient seizure-gratis. However, the benefits of surgery should always be weighed carefully against its potential risks.

People with epilepsy are at hazard for two life-threatening conditions: tonic-clonic status epilepticus and sudden unexplained death in epilepsy (SUDEP). Tonic-clonic status epilepticus is a long-lasting seizure that's considered a medical emergency. If not stopped within about 30 minutes, information technology may cause permanent injury or death.

SUDEP is a rare condition in which immature or middle-aged people with epilepsy die without a clear crusade. It accounts for less than two percent of deaths amid people with epilepsy. The take chances is nigh one in three,000 per yr for all people with epilepsy. Still, it tin can be as high equally i in 300 for those who have frequent, uncontrollable seizures and take loftier doses of seizure medicines. Researchers are uncertain why SUDEP causes death. Some believe that a seizure causes an irregular eye rhythm. More than recent studies accept suggested that the person may suffocate from dumb animate, fluid in the lungs and lying face up down on bedding.

Although the risk is depression, people with epilepsy also can dice from inhaling vomit during or merely after a seizure.

Nearly women with epilepsy tin can become pregnant, but they should discuss their epilepsy and the medications they are taking with their doctors earlier getting pregnant. Many patients with epilepsy take high doses of medication that may lead to potentially harmful drug exposure to unborn babies. In some cases, medications may be reduced earlier pregnancy, especially if seizures are well-controlled. While seizure medications tin can produce nascence defects, severe nascence defects are rare in infants of women who receive regular prenatal care and whose seizures are carefully managed. Women with epilepsy accept a xc percent or better chance of having a normal, healthy baby.

Epilepsy is a chronic condition that affects people in different ways. Many people with epilepsy lead normal, active lives. Between seventy and 80 percent of people with epilepsy can successfully control their seizures through medication or surgical techniques.

Some people notice that they rarely accept to think virtually epilepsy, except when taking their medications or going to run into the doctor. No matter how epilepsy affects a person, it is important to remember that being well-informed near the condition and keeping a positive mental attitude are important. Working closely with ahealthcare squad and adhering to prescribed medications are essential to helping command seizures then that the patient can lead a full, balanced life.

• Picket a Proficient Solar day PA piece on epilepsy, featuring an interview with 2 doctors.
• Rebooting Kimberly's Brain: a story of a young woman'southward epilepsy treatment.
• Learn about a patient with epilepsy who, with new treatment, is able to have a baby.
• Hazel began exhibiting symptoms of epilepsy before her first birthday. Larn about her treatment journey.

These websites offer additional helpful data on epilepsy, its causes, treatment options, support and more (Note: these sites are not nether the auspice of The American Association of Neurological Surgeons, and their list hither should not exist seen as an endorsement of these sites or their content).

• Healthline
• Epilepsy Foundation
• National Institute of Neurological Disorders and Stroke Epilepsy Folio
• Epilepsy Therapy Project
• Centers for Disease Control and Prevention Epilepsy Folio
• American Epilepsy Society
• International League Against Epilepsy/International Agency for Epilepsy

The AANS does not endorse any treatments, procedures, products or physicians referenced in these patient fact sheets. This data is provided equally an educational service and is not intended to serve as medical communication. Anyone seeking specific neurosurgical communication or help should consult his or her neurosurgeon, or locate one in your area through the AANS' Find a Board-certified Neurosurgeon" online tool.

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Source: https://www.aans.org/en/Patients/Neurosurgical-Conditions-and-Treatments/Epilepsy

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