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E
pilepsy is a generic term used to define a variety of seizure disorders. A person with recurring seizures is said to have epilepsy.A seizure is a disturbance in the electrical activity of the brain. Twenty-five million Americans (one in every ten) have had, or will have, a seizure at some point in their lives.
Prevalence: About 2,500,000 people in the U.S. have some form of epilepsy. Thirty percent of them are children under the age of 18. A large number of children and adults have undetected or untreated epilepsy.
Incidence: About 125,000 newly diagnosed cases each year.
Age of onset: Epilepsy primarily affects children and young adults, although anyone can get epilepsy at anytime. Twenty percent of cases develop before the age of five. Fifty percent develop before the age of 25. It is also increasingly associated with the elderly, and there are as many cases of epilepsy in those 60 years of age and older as in children 10 years of age and under.
Causes: In about 70% of cases there is no known cause. Of the remaining 30%, the following are the most frequent:
Head trauma, especially from automobile accidents, gunshot wounds, sports accidents, falls and blows at work or in the home. The more severe the injury, the greater the risk of developing epilepsy.
Brain tumor and stroke.
Poisoning, such as lead poisoning. More than 5,000 people each year are reported to suffer seizures caused by alcoholism.
Infection, such as meningitis, viral encephalitis, lupus erythmeatosus and, less frequently, mumps, measles, diptheria and others.
Maternal injury, infection or systemic illness affecting the developing brain of the fetus during pregnancy.
Role of heredity: All people inherit varying degrees of susceptibility to seizures. The genetic factor is assumed to be greater when no specific cause can be identified.
Treatment: Modern treatment methods can achieve full or partial control of seizures in about 85 percent of cases. Some seizure disorders of infancy and early childhood are still highly resistant to current therapies.
Medical - major form of treatment is long-term anticonvulsant drug therapy. Some 20 antiepileptic drugs are currently in use. While multiple-drug therapy is sometimes necessary, single-drug therapy is more common.
Surgical - used only when medication fails. Most common form takes place when the brain tissue causing seizures is confined to a small focal area of the brain that can be safely removed without damaging personality or function.
Dietary - a special high-fat, high calorie diet may succeed in some childhood cases when standard treatment fails.
Major problems:
Treatment
- Despite available therapies, an estimated 15 percent do not have complete seizure control and a similar proportion of cases is virtually resistant to current drug therapy. New medications with fewer side effects are desperately needed both for cases resistant to treatment and for patients under multiple-drug therapy for whom monotherapy is not yet possible.Diagnosis - There is more than 20 different seizure disorders. Recent international reclassification of symptoms, along with improved brain wave monitoring technology, new and efficient methods to precisely measure blood drug levels, non-invasive brain imaging and brain function measurement technologies, now permit the more specific diagnosis and treatment of epilepsy. Convulsive seizures are easily recognized. But there are other less apparent forms of epilepsy marked by non-convulsive seizure types. These seizures affect awareness, produce brief loss of muscle control and may involve sensory distortions. Early diagnosis is crucial. Children and adults with undiagnosed seizures risk developing a more severe, more difficult to treat condition.
Unemployment/Underemployment - 20-30 percent of people with epilepsy and physically able to work are unemployed. Many of those who are employed have been forced to accept positions far below their ability and educational achievement. For many people, having epilepsy has been less of a problem than overcoming negative attitudes about their intellectual and physical abilities. Changes in the law, especially provisions of the Americans with Disabilities Act, offer new hope in this area.
Impact on Children - The National Center for Health Statistics reports 422,000 cases of epilepsy in children 18 years of age and under, based on the 1988 National Health Interview Survey. Of these children, 65.5 percent of 276,500 have special needs ("condition caused problems during the past year, such as missing school, staying in bed or feeling upset most or all of the time").
Mortality - Epilepsy carries an increased risk of death from a variety of causes. Most seizures are benign, but a prolonged seizure can evolve into status epilepticus, a condition that sometimes leads to brain damage and, occasionally, death. People with epilepsy also have a greater than average fatality rate for suicide, sudden unexplained death syndrome, and accidental death, especially drowning.
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This fact sheet contains answers to some of the most commonly asked questions about the diet.
What is the ketogenic diet? The ketogenic diet is a high-fat, very low carbohydrate diet used in children who have epilepsy that is difficult to control with current medications. The diet should be considered for children who have more than two seizures per week despite treatment with at least two different anticonvulsant medications. The diet is also used when the frequency of seizures, despite medications, interferes with the child's function, or when the medications themselves cause substantial adverse reactions. This diet is not currently being used in adults.
Who can be helped by the diet, and how much? Many children with epilepsy can be helped by the diet. There is no way to predict whether it will be successful--except to try it. Traditionally, the diet has been used in children between 2 and 10 years of age; however, we have used it in children as young as one year, and in teens. Its use in adults has been limited and there is, as yet, no information about the effectiveness in adults. The diet seems to be most effective in children with 'drop' type (myoclonic, atonic, or tonic-clonic) seizures, or with the Lennox-Gastaut syndrome. When traditional anticonvulsant medications have not been effective, or if they produce unwanted side effects, the ketogenic diet may be an alternative.
How effective is the diet? Studies done over many years suggest that 20%-25% of children on the ketogenic diet will have their seizures well controlled. An additional 30%-40% of children will have their seizure frequency decreased by 50%. Approximately 25%-30% of patients who try the diet will find, after one to two months, that it is not sufficiently effective. These return to the use of medications. Some children may be able to decrease or discontinue their medications while on the diet.
How does the diet work? No one is certain how the diet works. Fasting (no eating) produces ketosis, because the body is unable to completely burn the fat it is using for energy. The ketones are the by-products of the incompletely burned fat. The ketogenic diet is a high-fat, low-carbohydrate diet which simulates the biochemical changes of starvation. In the virtual absence of glucose (or other carbohydrates) the body, and more especially the brain, is able to burn these ketone bodies for energy. How the burning of these ketones controls seizures is unknown.
What is the diet all about? Ketosis is produced by eating foods which are ketogenic (fats) and avoiding foods which are anti-ketogenic (carbohydrates). The dietitian will calculate how many calories a child needs for energy and for growth. This amount is about 75% of the usual recommended daily allowance (RDA) for the child's age. The diet is usually started in a 4:1 ratio (4 parts fat to 1 part protein and carbohydrate) or in a 3:1 ratio. The dietitian calculates the meal plans. Each meal is precisely calculated to create a ketogenic formula.
The diet is usually started in the hospital and is always done under careful medical supervision. It is usually started by fasting the child for 48 hours and giving limited amounts of water. Throughout the fasting stage, it is important to monitor the child carefully to be certain he/she does not become too dehydrated; that the blood sugar does not drop too low, and that the medications do not cause the child to become toxic. Most children tolerate this period well. Once the child has large amounts of ketones in the urine, the diet is gradually introduced. The child is discharged on the fifth day, having started the full diet. Throughout the hospitalization the parents are instructed about the diet, including how to weigh and measure the foods and avoid products or medications which contain carbohydrates.
Even small amounts of carbohydrates such as a cookie, several nuts, or carbohydrate-containing toothpaste or antibiotics may eliminate the ketosis and nullify the effects of the diet. Fluid intake is also moderately restricted.
Are children getting enough to eat on this diet? The portions of food on the ketogenic diet are small by usual standards, but the diet is calculated to provide every thing the child needs to grow and to gain weight very slowly. The diet requires vitamin and mineral supplements.
Doesn't a high-fat diet cause heart disease and strokes? While the effects of the diet on blood cholesterol and other lipids are under investigation, there is currently no evidence that the diet causes early heart disease or strokes.
What are the benefits of the diet? The obvious benefit of the diet is the potential for seizure control. Sometimes, seizures are controlled as soon as the child becomes ketonic, but this effect may sometimes take as much as a month or longer. Another benefit is that frequently the anticonvulsant mediations can be reduced gradualy or discontinued. This can, in some cases, provide a child seizure control without the side effects of medication.
How restrictive is the diet? The diet is very restrictive, but the restrictions are usually worthwhile if sezures stop or are significantly reduced. Only the foods and the quantities calculated into the diet can be consumed. Medications which are not sugar-free must be avoided.
Are there complications with this diet? During the initiation of the diet there may be nausea, vomiting, and even low blood sugars. This is the reason for starting the diet in the hospital. The ketosis decreases the child's appetite, so even though the portions are small, hunger is not a problem for most children. Occasionally children develop kidney stones, but adjustment of the calcium supplements in the kiet and increasing the daily fluids usually resolves the problem. Constipation is often a problem. Ketosis increases absorption of some medications; therefore each child should be monitored for toxicity, and medication dosage should be adjusted when necessary. The goal is for the child to be on as little medicine as possible, or medication free.
Are there different ketogenic diets? The main variation of the diet is the MCT (medium-chain triglyceride) diet which allows a lightly greater proportion of carbohydrates and protein while maintaining ketosis. While reported to be as effective as the traditional diet, it seems less well-tolerated causing nausea, vomiting, cramps, and diarrhea. We often add small amounts of MCT oil to our diet to increase ketosis and to decrease the constipation.
How long must the child remain on the diet? When a child's seziures are well controlled, we continue the diet for two years. If seizures are controlled, we then decrease the diet to a 3:1 ration and after six months to a 2:1 ratio. If the seizures recur, we increase the ratio once again. Seizure control will return. We then continue the diet for another year. Children, whose seizures are improved but not controlled may remain on the diet for many years.
THE DIET SHOULD ONLY BE USED UNDER THE SUPERVISION OF PHYSICIANS WHO ARE FAMILIAR WITH THE DIET, AND UNDER THE DIRECTION OF DIETITIANS WHO HAVE EXPERIENCE WITH THE DIET.
A team approach, which includes the child's parents, is essential to the success of this treatment. Families need extensive training and support throughout the initial phases of the diet. Finding the appropriate mix of calories, ketosis, medications, and fat ratio is an art which requires trial and error as well as sophistication. There is not a standard set of menues that will apply to all children, or even to all children of the same weight. Access to the keto team for assistance in the 'fine-tuning' of the diet is the most important ingredient in success. Coaching from parents whose children have been on the diet can provide much needed support for anxious parents during the early phases of the diet, and can relieve some of the burden on the hospital staff.
What are the problems you most frequently encounter? The most common problems are: too many calories seen as weight gain in the child. One hundred extra calories per day equals one poiund of weight gain per month. Children should lose weight during the fasting and the initial phases of the diet, and regain their initial weight over about one year. Blood in the urine, or gravel in the diaper are signs of kidney stones. The child needs to see the physician and the urine needs analysis. Most commonly, this is due to excess calcium excretion. Excess sleepiness is virtually never due to the diet, but will respond to decreasing medication. Continued seizures on the diet may also decrease when medications are decreased.
Can the diet be used in a severely handicapped child? Yes. Children profoundly handicapped with seizures may have the diet given as the tube feedings (or gastrostomy feeding) if necessary.
Further information about the ketogenic diet may be obtained from a video and a book about the diet.
The video is available from the Charlie foundation, 1223 Wilshire Boulevard, Santa Monica, CA 90403. Phone 1-800-FOR KETO (1-800-367-5386).
The book, The Epilepsy Diet Treatment: An Introduction to the Ketogenic Diet, may be obtained from Vermande Publishers, 386 park AVenue South, New York, NY 10016. Phone 1-800-532-8663 or (212) 683-0072 or from the Epilepsy Foundation of America, at 4351 Garden City Drive, landover, Maryland, 20785, or call 1-800-213-5821 or 301-349-3700.