Trial record 1 of 4 for:
Inherited Myokymia: A Clinical and Genetic Study of a Family
The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified November 2010 by China Medical University Hospital.
Recruitment status was: Recruiting
First Posted: December 1, 2010
Last Update Posted: December 1, 2010
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China Medical University Hospital
Neuromyotonia (NMT), so called Isaac's syndrome, is a rare disorder in which hyperexcitability of peripheral motor nerves leads to intermittent muscle contractions. It is characterized by muscle twitching at rest (visible myokymia), cramps, hyperhidrosis, paraesthesiae, mild muscle weakness. and impaired muscle relaxation, or pseudomyotonia. Electromyographic recording is a key diagnostic tool in detecting myokymia and neuromyotonia. Pathophysiology of neuromyotonia is claimed to be related immune disorder, autoimmune anti-voltage-gated potassium-channel antibodies and genetic mutation in potassium channel. KCNA1 (Kv1.1) mutation was mostly reported in a autosomal dominant trait. In the present study, we report a family affected with myokymia，worsening with elevated body temperature, febrile illness or spicy food. How the change in temperature influence clinical features of channelopathies is an interesting topic. Variant clinical severity of family members are recorded. The index patient has possible autoimmune mechanism involvement because of his clinical feature of myasthenia gravis with thymoma and hyperthyroidism. Further analyzing the genetic mutation in potassium channelopathy may provide researchers some pathophysiological insight into the Isaac's syndrome.
A Study of Clinical and Genetic Mutations in a Family of Neuromyotonia, so Called Isaac's Syndrome
||Observational Model: Case-Only
Time Perspective: Cross-Sectional
||Inherited Myokymia: A Clinical and Genetic Study of a Family
Biospecimen Retention: Samples With DNA
Genomic DNA was extracted from each patient's peripheral blood leukocytes using Genomaker DNA extraction kit (Blossom, Taipei, Taiwan). The complete KCNA1 coding region, including the intron/exon boundaries, was amplified according to the procedure reported by Imbrici et al
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| Estimated Primary Completion Date:
||March 2011 (Final data collection date for primary outcome measure)