Neuro: Myasthenia Gravis: Free MSRA Podcast

🎧 FREE MSRA PODCAST – Myasthenia Gravis: Autoimmunity, Fluctuating Weakness, and Exam EssentialsIn this Deep Dive, we demystify Myasthenia Gravis — a classic exam favourite and must-know for MSRA Neurology. Listen for everything you need to recognise, diagnose, and manage MG with confidence.📝 Key Learning Points📌 Definition• Chronic autoimmune disorder affecting the neuromuscular junction• Characterised by fluctuating, fatigable muscle weakness — especially affecting eyes, face, swallowing, and sometimes breathing📌 Pathology & Causes• Autoimmune attack: Most commonly IgG1 autoantibodies target the acetylcholine receptor (AChR) on the muscle side of the neuromuscular junction• Less commonly, antibodies against MuSK protein• Strong association with thymus gland abnormalities (thymoma in 15%, hyperplasia in up to 70%)• Linked to other autoimmune diseases (Graves, SLE, RA, vitiligo, Addison’s)📌 Epidemiology & Risk Factors• Prevalence: 15–20 per 100,000 in the UK• Bimodal onset: younger women (20s–30s), older men (>60)• Increased risk with family history, specific HLA types (B8, DR3), and coexisting autoimmune conditions📌 Clinical Features• Cardinal feature: muscle weakness that worsens with activity and improves with rest• Ocular (ptosis, diplopia), bulbar (dysarthria, dysphagia), and generalised (proximal limb) weakness• Respiratory muscle weakness = myasthenic crisis (emergency)• Triggers: infection, stress, certain drugs (aminoglycosides, fluoroquinolones, beta blockers, etc.)📌 Diagnosis• Bedside clues: Fluctuating, fatigable weakness without sensory loss• Antibody tests: AChR and MuSK antibodies (AChR+ in ~90% of generalised cases)• Neurophysiology: Repetitive nerve stimulation (decremental response); single-fibre EMG (increased jitter)• Imaging: Chest CT/MRI to look for thymoma• Ice pack test for ptosis (improvement after cooling)• Avoid edrophonium (Tensilon) test due to risks📌 Management• First line: Acetylcholinesterase inhibitors (pyridostigmine)• Immunosuppression: Corticosteroids, azathioprine (steroid-sparing), sometimes other agents (mycophenolate, rituximab)• Thymectomy: If thymoma or generalised AChR+ MG, especially in younger patients• Acute exacerbations/myasthenic crisis: IVIG or plasmapheresis, plus respiratory support• Multidisciplinary care: Speech therapy, physio, OT, dietary support📌 Prognosis & Complications• Outlook is good for most with modern treatments — near-normal life expectancy• Risks: myasthenic crisis (respiratory failure, requires ventilation), long-term immunosuppression complications, residual weakness• Watch for associated autoimmune diseases📎 More MSRA Myasthenia Gravis Resources:📝 Revision Notes: https://www.passthemsra.com/topic/myasthenia-gravis-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/myasthenia-gravis-flashcards/💬 Accordion Q&A: https://www.passthemsra.com/topic/myasthenia-gravis-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/myasthenia-gravis-rapid-quiz/🧪 Quiz Bank: https://www.passthemsra.com/quizzes/myasthenia-gravis/🎓 Neurology MSRA Course: https://www.passthemsra.com/courses/neurology-for-the-msra/#MSRA #MyastheniaGravis #MSRARevision #Neurology #MSRAFlashcards #MSRAQuiz #MSRAAccordions #Autoimmunity #PassTheMSRA