A number sign (#) is used with this entry because of evidence that episodic ataxia type 2 (EA2) is caused by heterozygous mutation in the calcium ion channel. PDF | O autor relata um caso clínico de ataxia episódica não familiar responsiva a acetazolamida, semelhante clinicamente a ataxia episódica tipo 2 (EA-2). Ataxia episódica não familiar possivelmente associada com o uso de nicotina: relato de caso. Arq. Neuro-Psiquiatr. [online]. , vol, n.3A, pp

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The findings indicated that screening for deletions in the CACNA1A gene should also be done for a complete genetic workup. The authors suggested that dystonia may be a manifestation of a degenerative cerebellar process. The documents contained in this web site are presented for information purposes only.

Nomenclature EA2 has also been known as periodic vestibulocerebellar ataxia and acetazolamide-responsive episodic ataxia. Delayed cerebral edema and fatal coma spisodica minor head trauma: Other search option s Alphabetical list.

89. Ataxia episódica tipo 2

Electromyographic studies reveal myokymia neuromyotonia. Prenatal Testing and Preimplantation Genetic Diagnosis Once the CACNA1A pathogenic variant has ataxka identified in an affected family member, prenatal testing for a pregnancy at increased risk and preimplantation genetic diagnosis for EA2 are possible.

No further modifications are allowed. While most centers would consider decisions regarding prenatal testing to be the choice of the parents, discussion of these issues is appropriate. The authors found, as have others e. Recipients of the drug also had decreased disease qtaxia, as measured by a questionnaire.

Specialised Social Services Eurordis directory. Similar articles in PubMed. Also diagnosed as Spinocerebellar ataxia type You can help by adding to it. Episodic ataxia type-3 Episodic is similar to EA1 but often also presents with tinnitus and vertigo. Individuals with SCA6 can present with episodic ataxia, mostly during the first years of the disorder. Mutations were identified in a total of 46 affected and 8 unaffected family members, demonstrating incomplete penetrance.


The causative locus has been mapped to a 4 cM region on chromosome 1q42 between markers D1S and D1S [ Steckley et alCader et al ]. Hereditary myokymia and paroxysmal ataxia linked to chromosome 12 is responsive to acetazolamide.

Attacks last from seconds to minutes. The various symptoms of EA are caused by dysfunction of differing areas. The family history of some individuals diagnosed with EA2 may appear to be negative because of failure to recognize the disorder in family members, reduced penetranceearly death of the parent before the onset of symptoms, or late onset of the disorder in the affected parent.

Can J Neurol Sci. Check this box if you wish to receive a copy of your message. EA2 attacks can be stopped or decreased in frequency and severity by administration of acetazolamide or 4-aminopyridine [ Strupp et alIlg et al ]; attacks can recur within 48 to 72 hours of stopping the medication [ von Brederlow et al ].

Episodic ataxia, type 2. Hill and Sherman described episodic cerebellar ataxia eplsodica particularly in children in a large kindred with an autosomal dominant pattern of inheritance. Over qtaxia mutations in this gene are reported in EA2 which is also allelic to familial hemiplegic migraine and spinocerebellar ataxia 6.

Ataxia episódica não familiar possivelmente associada com o uso de nicotina: relato de caso

There are currently 17 K V 1. Prevalence EA2 is rare. Acetazolamide is effective in controlling or reducing the frequency and severity of attacks in most individuals; typical starting dose is mg a day given orally, but doses as high as mg twice a day may be required.


Episodic ataxia type 2 EA2 should be suspected in individuals with the following clinical, neuroimaging, EMG, and family history findings.

He required “balance therapy” as a young child to aid in walking and has a number of ataxic attacks, each separated by months to years. One study reported vertigo and weakness accompanying the ataxia in more than half of individuals with genetically confirmed EA2 [ Jen et al ]. Phenotypes of spinocerebellar ataxia type 6 and familial hemiplegic migraine caused by a unique CACNA1A missense mutation in patients from a large family.

EA3 is characterized by brief acetazolamide-responsive attacks of vestibular ataxia, vertigo, tinnitus, and interictal myokymia. A genome-wide screen and linkage mapping for a large pedigree with episodic ataxia. Am J Med Genet. A bonus to all MIMmatch users is the option to sign up for updates on new gene-phenotype relationships.

Attacks last about two weeks, followed by relative normalcy. Hyperammonemias caused by deficiencies of urea cycle enzymes include carbamoylphosphate synthetase deficiency OMIMargininosuccinate synthetase deficiency citrullinemia type 1argininosuccinase deficiencyand arginase deficiency. Examination between attacks showed nystagmus, but no other neurologic signs.

Attacks can be associated with dysarthria, diplopia, tinnitus, dystonia, hemiplegia, and headache. All patients had a family history of the disorder. N Engl J Med.