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Cardiovascular

Myasthenia Gravis (MG)



History

  • Fluctuating weakness (worsens throughout the day)

  • Ptosis (difficulty opening eyes)

  • Dysphagia

  • Diplopia

  • Weakness worsens with stress

  • Breathlessness

  • Associated with autoimmune diseases (e.g. thyroid disease)


Examination

  • Asymmetrical ptosis

  • Hoarse voice

  • Limb weakness/wasting

  • Dropped head sign

  • Monitor vital capacity (risk of respiratory failure)


Investigations

  • ACh receptor antibodies (first-line)

  • MuSK antibodies (if AChR negative)

  • Electromyography (if seronegative)

  • CT/MRI chest (thymoma, ~10% cases)

  • MRI brain (exclude differentials)

  • Ice pack test (supports ocular MG)


Management

  • Neurology referral

  • CT chest (exclude thymoma, consider thymectomy)

  • Cholinesterase inhibitors (pyridostigmine)

  • IV immunoglobulin/plasmapheresis (myasthenic crisis)

  • Immunosuppressants (e.g. steroids) if pyridostigmine insufficient

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