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[Multifocal demyelinating polyneuropathy with persistent conduction block (Lewis-Sumner syndrome)].

T Mezaki1, R Kaji, T Hamano

  • 1Department of Neurology, Kyoto University.

Rinsho Shinkeigaku = Clinical Neurology
|November 1, 1990
PubMed
Summary

Lewis-Sumner syndrome, a CIDP variant, can mimic motor neuron disease. Diagnosis requires nerve conduction studies showing conduction block, with magnetic stimulation aiding in identifying focal demyelination.

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Area of Science:

  • Neurology
  • Clinical Neuroscience

Background:

  • Lewis-Sumner syndrome (LSS) is a rare variant of chronic inflammatory demyelinating polyradiculoneuropathy (CIDP).
  • LSS often presents with symptoms that mimic motor neuron disease (MND), leading to diagnostic challenges.

Observation:

  • This report details three patients initially misdiagnosed with MND but later confirmed to have LSS.
  • One patient experienced significant clinical recovery following immunoglobulin therapy, highlighting treatment responsiveness.

Findings:

  • The definitive diagnosis of LSS relies on electrodiagnostic evidence of multiple, persistent conduction blocks on nerve conduction studies.
  • Careful technique is crucial to avoid misinterpreting insufficient stimulation as conduction block.
  • Magnetic nerve stimulation demonstrated superior efficacy over electric stimulation in eliciting responses, likely due to deeper current penetration, proving valuable for proximal nerve segment assessment.

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Implications:

  • Accurate diagnosis of LSS is critical to differentiate it from MND and initiate appropriate treatment.
  • Advanced electrodiagnostic techniques, such as magnetic nerve stimulation, enhance the detection of focal demyelination in LSS.
  • Early and correct diagnosis can lead to improved patient outcomes and management strategies.