Neuro: Myotonic Dystrophy: Free MSRA Podcast

⚕️ FREE MSRA PODCAST – Myotonic Dystrophy🎧 A clear, high-yield breakdown of this inherited multisystem muscle disorder – perfect for exam prep and real-life clinical scenarios.🧠 Key Learning Points📌 Definition• Myotonic dystrophy is a progressive, autosomal dominant genetic condition affecting muscle and multiple organ systems.• Characterised by muscle weakness, myotonia (delayed relaxation), and systemic features.📌 Causes & Risk Factors• DM1: CTG repeat in DMPK gene (Chr 19)• DM2: CCTG repeat in ZNF9/CNBP gene (Chr 3)• Autosomal dominant inheritance (50% risk if parent affected)• Risk: family history🧠 Mnemonic: “DMPK = DM1, CTG = Can’t Then Go” (relax muscle)📌 Pathophysiology• Trinucleotide/tetranucleotide repeat expansions• Abnormal RNA accumulates → interferes with gene splicing• Widespread protein dysfunction in muscle, heart, endocrine, CNS📌 Symptoms• Myotonia (delayed hand grip release)• Progressive distal muscle weakness• Frontal balding, ptosis, long ‘myopathic’ face• Cataracts, cardiac conduction issues, dysphagia• Cognitive impairment, diabetes, testicular atrophy🧠 Mnemonic: "My Tonic FACE DIED"Face = frontal balding, Atrophy, Cataracts, Endocrine, Dysphagia📌 Differential Diagnosis• Other muscular dystrophies• Myopathies (e.g., polymyositis)• Neuromuscular junction disorders (e.g., myasthenia gravis)• Mitochondrial diseases📌 Diagnosis• 💯 Genetic testing: confirms CTG/CCTG repeats• EMG: myotonic discharges• ECG/Echo: cardiac risk monitoring🧠 Tip: Confirm genetics, assess systemic damage early📌 Management• No cure – symptomatic & supportive• Physio + OT for mobility• Speech therapy for dysarthria/dysphagia• Cardiac monitoring (e.g., ECG annually)• Cataract screening• Endocrine support (diabetes, thyroid)• Mexiletine for myotonia (if severe)• Multidisciplinary team essential!📌 Complications• Respiratory failure• Arrhythmias → sudden cardiac death• GI dysmotility• Diabetes, cataracts, infertility• Depression, social/functional decline📌 Prognosis• Progressive but variable course• Severe DM1 = reduced life expectancy (due to cardiac/respiratory issues)• Early supportive care improves quality of life📎 More MSRA Resources for Myotonic Dystrophy📝 Revision Notes: https://www.passthemsra.com/topic/myotonic-dystrophy-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/myotonic-dystrophy-flashcards/💬 Accordion Q&A Notes: https://www.passthemsra.com/topic/myotonic-dystrophy-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/myotonic-dystrophy-rapid-quiz/🎓 Full Course: https://www.passthemsra.com/courses/neurology-for-the-msra/Hashtags#MSRA #MSRARevision #MSRATextbook #MSRAQuiz #MSRAQuestionBank #MSRAFlashcards #MSRAQ&ANotes #MSRAAccordions #MultiSpecialityRecruitmentAssessment #MSRAOnlineRevision #MSRARevisionWebsite #MyotonicDystrophy #Neurology