Myoclonic astatic epilepsy


Myoclonic astatic epilepsy, also known as myoclonic atonic epilepsy or Doose syndrome, is a generalized idiopathic epilepsy. It is characterized by the development of myoclonic seizures and/or myoclonic astatic seizures.

Signs and symptoms

The onset of seizures is between the ages of 2 and 5 years of age. EEG shows regular and irregular bilaterally synchronous 2- to 3-Hz spike-waves and polyspike patterns with a 4- to 7-Hz background. 84% of affected children show normal development prior to seizures; the remainder show moderate psychomotor retardation mainly affecting speech. Boys are more often affected than girls.

Diagnosis

Treatments

The treatment for seizures may include antiepileptic medications, diet and vagus nerve stimulator.

Medication

Any number of medications may be used to both prevent and treat seizures.
Generally after three medications are tried, different treatment should be considered. Some medications are harmful to those with this syndrome and can increase seizures.

Diet

The ketogenic diet mimics some of the effects of starvation, in which the body first uses up glucose and glycogen before burning stored body fat. In the absence of glucose, the body produces ketones, a chemical by-product of fat metabolism that has been known to inhibit seizures.
A modified version of a popular low-carbohydrate, high-fat diet which is less restrictive than the ketogenic diet.
The low glycemic index treatment is a new dietary therapy currently being studied to treat epilepsy. LGIT attempts to reproduce the positive effects of the ketogenic diet. The treatment allows a more generous intake of carbohydrates than the ketogenic diet, but is restricted to foods that have a low glycemic index, meaning foods that have a relatively low impact on blood-glucose levels. These foods include meats, cheeses, and most vegetables because these foods have a relatively low glycemic index. Foods do not have to be weighed, but instead careful attention must be paid to portion size and balancing the intake of carbohydrates throughout the day with adequate amounts of fats and proteins.

Prognosis

Epilepsy with myoclonic-astatic seizures has a variable course and outcome. Spontaneous remission with normal development has been observed in a few untreated cases. Complete seizure control can be achieved in about half of the cases with antiepileptic drug treatment. In the remainder of cases, the level of intelligence deteriorates and the children become severely intellectually disabled. Other neurologic abnormalities such as ataxia, poor motor function, dysarthria, and poor language development may emerge. However, this proportion may not be representative because in this series the data were collected in an institution for children with severe epilepsy.
The outcome is unfavorable if generalized tonic-clonic, tonic, or clonic seizures appear at the onset or occur frequently during the course. Generalized tonic-clonic seizures usually occur during the daytime in this disorder, at least in the early stages. Nocturnal generalized tonic-clonic seizures, which may develop later, are another unfavorable sign. If tonic seizures appear, prognosis is poor.
Status epilepticus with myoclonic, astatic, myoclonic-astatic, or absence seizures is another ominous sign, especially when prolonged or appearing early.
Failure to suppress the EEG abnormalities during therapy and absence of occipital alpha-rhythm with therapy also suggest a poor prognosis.

History

Myoclonic-astatic epilepsy was first described and identified in 1970 by Herman Doose as an epilepsy syndrome, hence its original label, Doose syndrome. 1989, it was classified as a symptomatic generalized epilepsy by the International League Against Epilepsy.