Opthal: Optic Neuritis: Free MSRA Podcast

🎧 Deep Dive: Optic Neuritis — Sudden Vision Loss You Can’t IgnoreA must-know MSRA topic. Sudden visual change, painful eye movement, red desaturation — optic neuritis is a red flag for neurological disease. Here's what you need to recognise it fast and manage it right. 👁️⚡🔍 What is Optic Neuritis?Inflammation of the optic nerve → acute vision loss, often in one eye, often painful. Signals to the brain are disrupted.🧠 Causes & Triggers• 🧬 Autoimmune: Multiple sclerosis (MS – most common)• 🦠 Infections: Viral (post-viral), syphilis, TB, Lyme• 💉 Drugs/toxins: Amiodarone, ethambutol• 🩸 Ischaemia: Giant cell arteritis• 🧫 Nutritional: B12 deficiency• 🧬 Inherited: Leber’s optic neuropathy💡 Mnemonic: SITPIN – Syphilis, Inflammation, Toxins, Post-viral, Ischaemia, Nutritional👩‍⚕️ Who’s at Risk?• Females > males• Young adults (20–45)• Autoimmune disease• Recent viral illness• MS risk factors💡 Mnemonic: FIRM – Females, Immune disease, Recent infection, MS links🔬 PathophysiologyAutoimmune demyelination (often MS) → disrupted conduction along optic nerveOther triggers: post-viral, systemic disease🧾 Classic Symptoms• Monocular visual loss• Pain with eye movement• Red desaturation• Blurred/dim vision• RAPD• Central scotoma• Photopsia• Uhthoff’s phenomenon (worse vision with heat)• Pulfrich’s (depth distortion)💡 Mnemonic: BPC-RUP – Blurring, Pain, Colour loss, RAPD, Uhthoff, Pulfrich🩺 Differential Diagnoses• Ischaemic optic neuropathy• Tumour/compression• Posterior scleritis• Retinal/macular pathology• Big blind spot syndrome📊 Epidemiology• 5–8 per 100,000 annually in UK• Most common in young women• Up to 50% MS risk if brain lesions on MRI🔎 Investigations• Visual acuity, visual fields• RAPD testing• OCT → RNFL thinning• MRI brain/orbits → demyelinating lesions• Bloods: ESR/CRP, NMO-IgG, B12, syphilis• ± LP, VEP if needed💡 3+ MRI lesions = 50% MS risk in 5 years💊 Management (UK Focus)✅ IV methylprednisolone → faster recovery✅ Oral steroid taper after IV❌ No oral steroids alone (↑ relapse risk)🔁 Treat cause (e.g., MS, NMO, GCA, B12)🩸 NMO → consider plasmapheresis🧣 Advice: Cool showers (Uhthoff), tinted lenses (Pulfrich), patient education📈 Prognosis👍 Most recover vision in weeks–months👎 1 in 3 have colour/contrast loss📉 50% MS risk if MRI lesions🔁 Recurrence possible → Follow-up essential🧠 Quick Summary• Sudden vision loss + eye pain → suspect optic neuritis• Red desaturation + RAPD = key signs• Always MRI for MS risk• Treat with IV steroids + manage underlying condition• Educate + follow-up long term📚 MSRA Resources for Optic Neuritis:📝 Revision Notes:https://www.passthemsra.com/topic/optic-neuritis-revision-notes/🃏 Flashcards:https://www.passthemsra.com/topic/optic-neuritis-flashcards/📂 Accordion Q&A:https://www.passthemsra.com/topic/optic-neuritis-accordion-qa-notes/🧪 Rapid Quiz:https://www.passthemsra.com/topic/optic-neuritis-rapid-quiz/🎯 Full Quiz:https://www.passthemsra.com/quizzes/optic-neuritis/🌐 Revision Sites:https://www.passthemsra.com | https://www.freemsra.comThanks for joining this 🔎 Deep Dive on Optic Neuritis — because protecting vision starts with knowing what to spot before it’s too late.#MSRA #OpticNeuritis #MSRARevision #PassTheMSRA #OphthalmologyMSRA #Neurology #RedDesaturation #RAPD #IVSteroids #FreeMSRA #GPTraining #MSRAFlashcards #MSRAQuiz #MSRAAccordions