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We report a family in which two sisters with myotonia congenita (MyC) were referred for malignant hyperthermia (MH) evaluation after each developed muscle rigidity with anesthesia. Halothane contracture testing of skeletal muscle in both was consistent with MH susceptibility. A third sister without
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BACKGROUND
A common form of congenital myotonia, myotonia congenita (MC), is caused by mutations in the skeletal muscle Cl(-) channel gene type 1 (CLCN1). Due to the reduced Cl(-) conductance of the mutated channels, the patients may develop generalized muscle rigidity and hypermetabolism during
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Native American myopathy (NAM) [OMIM 255995], a putative autosomal recessive disorder, was first reported in the Lumbee Indians of North Carolina. NAM features include congenital weakness and arthrogryposis, cleft palate, ptosis, short stature, kyphoscoliosis, talipes deformities, and susceptibility
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Six goats with myotonia congenita were exposed for 1 h to 1% halothane and a single injection of suxamethonium i.v. in an attempt to induce malignant hyperthermia. No evidence of malignant hyperthermia occurred. Suxamethonium did produce a myotonic response in each goat, lasting 10-20s, which was
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BACKGROUND
Ryanodine receptor 1 (RyR1) is a Ca(2+) release channel located in the sarcoplasmic reticulum membrane of skeletal muscle. More than 200 variants in RyR1 have been identified in DNA from patients with malignant hyperthermia (MH) and congenital myopathies; only 30 have been sufficiently
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Malignant hyperthermia (MH) is a rare clinical syndrome characterized by hypermetabolism and triggered by specific anesthetic agents. The mechanism of this abnormal reaction is due to uncontrolled calcium flux in the skeletal muscles resulting in a variable clinical syndrome of muscle rigidity,
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A 55-year-old woman with congenital myotonia (Becker type), diagnosed by muscle biopsy and gene examination, underwent a right lower lobectomy assisted with thoracoscopy for lung cancer. After epidural tube replacement at T 9-10, general anesthesia was introduced with propofol 2.5 mg x kg(-1) and
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Myotonia congenita (MC) is caused by a defect in the skeletal muscle chloride channel function, which may cause sustained membrane depolarisation. We describe a previously healthy 32-year-old woman who developed a life-threatening muscle spasm and secondary ventilation difficulties following a
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Myotonia is defined as a persistent contraction of skeletal muscles after their stimulation. This contracture is not prevented or relieved by regional anaesthesia or muscle relaxants. The sensitivity to non-depolarizing muscle relaxants is usually normal. Suxamethonium, neostigmine, hypothermia, a
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Many physiological processes depend upon the proper functioning of plasma membrane ion channels. This is most apparent in absorptive and secretory epithelia, and in electrically excitable tissues such as nerve and muscle. Disturbances in the operation of ion channels in these settings can alter
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What do epilepsy, migraine headache, deafness, episodic ataxia, periodic paralysis, malignant hyperthermia, and generalized myotonia have in common? These human neurological disorders can be caused by mutations in genes for ion channels. Many of the channel diseases are "paroxysmal disorders" whose
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Rapid progress in the complementary fields of molecular genetics and cellular electrophysiology has led to a better understanding of many disorders which are caused by ion channel dysfunction. These channelopathies may manifest in a multitude of ways depending on the tissue specificity of the
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Recently, a variety of ion channel defects have been identified as the biological basis of certain familial epilepsies, paroxysmal movement disorders, myopathies and some degenerative disorders of central nervous system. Ion channel defects were mainly caused by genetic and autoimmune mechanisms.
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