Morvan's syndrome: clinical, laboratory, and in vitro electrophysiological studies.

Abstract:

:Morvan's syndrome is a rare disorder characterized by neuromyotonia, hyperhidrosis, and central nervous system dysfunction. We report a patient with features of this syndrome, but who initially presented with breathing difficulties. Concentric needle electromyography showed an abundance of myokymic and neuromyotonic discharges. Exercise tests and repetitive nerve stimulation showed a decrement-increment response of compound muscle action potentials. Antibodies against voltage-gated potassium channels were not detected on repeated testing, but the presence of oligoclonal bands in the cerebrospinal fluid (CSF) suggested an autoimmune etiology. At follow-up over 3 years, no cancer was found. Electrophysiological in vitro studies of effects of patient serum and CSF on rat nerves provided no evidence of altered voltage-gated sodium or potassium conductances. We conclude that putative humoral factors do not block ion channels acutely but may cause channel dysfunction with chronic exposure.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Löscher WN,Wanschitz J,Reiners K,Quasthoff S

doi

10.1002/mus.20081

subject

Has Abstract

pub_date

2004-08-01 00:00:00

pages

157-63

issue

2

eissn

0148-639X

issn

1097-4598

journal_volume

30

pub_type

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