* Tonic-clonic seizures: seizures with repetitive sequences of stiffening and jerking of the extremities. * Myoclonic seizures: seizures with rapid, brief contractions of muscles. * Atonic seizures: seizures with a sudden loss of muscle tone, often resulting in sudden collapse. These are also called drop seizures. * Absence seizures: a generalized seizure characterized by staring off and occasionally some orofacial automatisms. * Myoclonic<unk>  seizures: seizures that involve a myoclonic seizure followed immediately by an atonic seizure. This type of seizure is exclusive to<unk>  and is one of the defining characteristics of this syndrome. * Tonic seizures: muscle stiffening or rigidity. This seizure is rare in this syndrome. Onset 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 (74%) are more often affected than girls (Doose and Baier 1987a).
Myoclonic astatic epilepsy
Myoclonic epilepsy
Progressive myoclonus epilepsy
Vertiginous epilepsy
Rolandic epilepsy
Musicogenic epilepsy
Childhood absence epilepsy
Northern epilepsy syndrome