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Published on: September 12, 2016
Neuromyotonia: autoimmune pathogenesis and response to immune modulating therapy
G R Hayat1, K Kulkantrakorn, W W Campbell
1Department of Neurology, Saint Louis University, 3635 Vista at Grand Blvd., 63110-0250, St. Louis, MO, USA. hayatg@slucare1.sluh.edu
Journal of the Neurological Sciences
|December 2, 2000
Summary
Neuromyotonia (NMT) is linked to autoimmune conditions and nerve damage. Plasma exchange significantly improved symptoms in patients with NMT and associated immune disorders.
Area of Science:
- Neurology
- Immunology
- Channelopathies
Background:
- Neuromyotonia (NMT) is hypothesized as an autoimmune channelopathy, potentially involving voltage-gated potassium channels (VGKC).
- This condition can lead to nerve hyperexcitability and abnormal electrical discharges.
Observation:
- Three patients with NMT were studied, all presenting with associated immune-mediated conditions.
- These included myasthenia gravis, thymoma (malignant in two with metastasis), and peripheral neuropathies.
- One patient exhibited both peripheral neuropathy and neuromuscular junction involvement (pre- and post-synaptic).
Findings:
- All patients demonstrated polyneuropathy and neuromyotonic discharges on electrodiagnostic studies.
- Elevated acetylcholine receptor antibodies were detected in all three individuals.
- Two patients with malignant thymoma showed metastasis.
Implications:
- Findings strongly support a humoral autoimmune pathogenesis for NMT, likely involving K(+) channels.
- This mechanism may affect acetylcholine release and postsynaptic membrane function.
- Clinicians should consider associated immune conditions in NMT patients and the potential benefit of plasma exchange.
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