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Lambert-Eaton myasthenic syndrome.

¹Southern General Hospital, Neurology, 1345 Govan Road, Glasgow, G51 4TF, UK.

BMJ Case Reports

|June 21, 2011

Summary

Lambert-Eaton myasthenic syndrome involves autoantibodies attacking pre-synaptic calcium channels, disrupting neuromuscular transmission. This rare autoimmune disorder primarily causes proximal leg weakness and may include neuropathy, but typically spares bulbar function.

Area of Science:

Neurology
Immunology
Neuroscience

Background:

Lambert-Eaton myasthenic syndrome (LEMS) is a rare autoimmune disorder affecting neuromuscular transmission.
It is characterized by autoantibodies targeting presynaptic voltage-gated calcium channels.

Purpose of the Study:

To summarize the key features of Lambert-Eaton myasthenic syndrome.
To highlight the underlying autoimmune mechanism and clinical presentation.

Main Methods:

Review of existing literature on LEMS.
Analysis of clinical characteristics and pathophysiology.

Main Results:

LEMS presents with proximal muscle weakness, predominantly in the lower limbs.
Associated symptoms can include peripheral and autonomic neuropathy.

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Bulbar muscle weakness and significant fatigueability are uncommon features.

Conclusions:

LEMS is an autoimmune disorder of neuromuscular transmission due to antibodies against presynaptic calcium channels.
Clinical diagnosis relies on characteristic weakness patterns and exclusion of other neuromuscular disorders.