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Overlap myasthenic syndrome.

R S Wadia1, A A Barhate1, B N Pereira1

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Summary
This summary is machine-generated.

This case report describes an overlap myasthenic syndrome, combining features of myasthenia gravis and Lambert-Eaton myasthenic syndrome (LEMS). It details the first reported instance of this condition in India.

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Area of Science:

  • Neurology
  • Clinical Case Reports

Background:

  • Overlap myasthenic syndrome presents with features of both myasthenia gravis and Lambert-Eaton myasthenic syndrome (LEMS).
  • Thyrotoxicosis can be a preceding condition.
  • Diagnosis can be complex due to overlapping and evolving electrophysiological features.

Purpose of the Study:

  • To report the first case of overlap myasthenic syndrome in India.
  • To illustrate the diagnostic challenges and clinical course of such a condition.

Main Methods:

  • Clinical presentation with bulbar and limb weakness.
  • Electromyography (EMG) showing decrement on repetitive nerve stimulation.
  • Nerve conduction studies indicating axonal degeneration.
  • Response to steroids and Prostigmine.
  • Detailed electrophysiological assessment over multiple admissions.

Main Results:

  • The patient initially presented with thyrotoxicosis, followed by bulbar and limb weakness with EMG findings suggestive of myasthenia gravis.
  • A subsequent admission revealed features mimicking axonal neuropathy with respiratory compromise.
  • The final admission showed clear electrophysiological evidence of LEMS, alongside bulbar and facial weakness responsive to Prostigmine, confirming myasthenia gravis.

Conclusions:

  • This case highlights the existence of overlap myasthenic syndrome with distinct clinical and electrophysiological phases.
  • It underscores the importance of comprehensive electrodiagnostic testing and clinical correlation for accurate diagnosis.
  • This represents the first documented case of overlap myasthenic syndrome in India, expanding the geographical understanding of this rare condition.