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episodic ataxia
Episodic ataxia (EA) is an autosomal dominant disorder characterized by sporadic bouts of ataxia (severe discoordination) with or without myokymia (continuous muscle movement). There are seven types recognised but the majority are due to two recognized entities.〔Riant F, Vahedi K, Tournier-Lasserve E (2011) Hereditary episodic ataxia. Rev Neurol (Paris)〕 Ataxia can be provoked by stress, startle, or heavy exertion such as exercise. Symptoms can first appear in infancy. There are at least 6 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 ataxia. Some patients respond to acetazolamide though others do not.
==Signs/Symptoms==
Typically, episodic ataxia presents as bouts of ataxia induced by startle, stress, or exertion. Some patients also have continuous tremors of various motor groups, known as myokymia. Other patients have nystagmus, vertigo, tinnitus, diplopia or seizures.
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