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Episodic ataxia type 1

Synonyms
ATAXIA, EPISODIC, WITH MYOKYMIA; Episodic ataxia/myokymia syndrome; MYOKYMIA WITH PERIODIC ATAXIA; PAROXYSMAL ATAXIA WITH NEUROMYOTONIA, HEREDITARY
Modes of inheritance
Autosomal dominant inheritance (Orphanet)

Summary

Excerpted from the GeneReview: Episodic Ataxia Type 1
Episodic ataxia type 1 (EA1) is a potassium channelopathy characterized by constant myokymia and dramatic episodes of spastic contractions of the skeletal muscles of the head, arms, and legs with loss of both motor coordination and balance. During attacks individuals may experience a number of variable symptoms including vertigo, blurred vision, diplopia, nausea, headache, diaphoresis, clumsiness, stiffening of the body, dysarthric speech, and difficulty in breathing, among others. EA1 may be associated with epilepsy. Other possible associations include delayed motor development, cognitive disability, choreoathetosis, and carpal spasm. Usually, onset is in childhood or early adolescence.
Full text of GeneReview (by section):
Summary
Diagnosis
Clinical Characteristics
Genetically Related (Allelic) Disorders
Differential Diagnosis
Management
Genetic Counseling
Resources
Molecular Genetics
References
Chapter Notes
Authors:
Sonia M Hasan
Maria Cristina D'Adamo
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Available tests

62 tests are in the database for this condition.

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Clinical tests (62 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: AEMK, EA1, HBK1, HUK1, KV1.1, MBK1, MK1, RBK1, KCNA1
    Summary: potassium voltage-gated channel subfamily A member 1

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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