<unk>  (EA) is an autosomal dominant disorder characterized by sporadic bouts of<unk>  (severe discoordination) with or without myokymia (continuous muscle movement). There are seven types recognized but the majority are due to two recognized entities.<unk>  can be provoked by psychological stress or startle, or heavy exertion, including exercise. Symptoms can first appear in infancy. There are at least six loci for EA, of which 4 are known genes. Some patients with EA also have migraine or progressive cerebellar degenerative disorders, symptomatic of either familial hemiplegic migraine or spinocerebellar<unk> . Some patients respond to acetazolamide though others do not.
Episodic ataxia
Myopathic gait
Holmes tremor
Parkinsonian gait
Pseudoathetosis
Periodic paralysis
Paroniria
Chorea 