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pubmed-article:10398198pubmed:abstractTextThe strength-duration time constant (SDTC) of a myelinated axon is a property of the nodal membrane and is sensitive to changes in membrane potential. Strength-duration time constants for motor axons and cutaneous afferents of the median nerve were measured in 9 patients with acquired neuromyotonia (NMT), a condition of peripheral nerve hyperexcitability, and 15 control patients. Mean motor axon time constants were significantly prolonged (344 +/- 100 micros) in patients compared to healthy controls (264 +/- 34 micros; P = 0.038), but sensory axon time constants were not significantly different. Motor axon time constants were longer than sensory axon time constants in 4 of the patients with neuromyotonia, suggesting that the nodal membrane was depolarized by an ectopic focus at the site of nerve stimulation at the wrist, ionic conductances were altered at the node, or that the size of the node was increased, possibly as a result of immune-mediated damage. The anti-voltage-gated potassium channel antibodies thought to generate peripheral nerve hyperexcitability in acquired neuromyotonia may be indirectly responsible for changes in motor axon nodal membrane properties.lld:pubmed
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pubmed-article:10398198pubmed:authorpubmed-author:MaddisonPPlld:pubmed
pubmed-article:10398198pubmed:authorpubmed-author:MillsK RKRlld:pubmed
pubmed-article:10398198pubmed:copyrightInfoCopyright 1999 John Wiley & Sons, Inc. Muscle Nerve 22: 823-830,1999lld:pubmed
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pubmed-article:10398198pubmed:volume22lld:pubmed
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pubmed-article:10398198pubmed:pagination823-30lld:pubmed
pubmed-article:10398198pubmed:dateRevised2004-11-17lld:pubmed
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pubmed-article:10398198pubmed:year1999lld:pubmed
pubmed-article:10398198pubmed:articleTitleStrength-duration properties of peripheral nerve in acquired neuromyotonia.lld:pubmed
pubmed-article:10398198pubmed:affiliationUniversity Department of Clinical Neurology, Radcliffe Infirmary, Oxford OX2 6HE, UK.lld:pubmed
pubmed-article:10398198pubmed:publicationTypeJournal Articlelld:pubmed
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