
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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