🎧MSRA Podcast:Episcleritis — More Than Just a Red Eye
Welcome to the DeepDive! Today we’re exploring episcleritis,a condition that shows up regularly in exams like the MSRA and in real-world general practice. It’s common, oftenbenign, but crucial to distinguish from its deeper, more dangerous cousin — scleritis.
👁️What Is Episcleritis?
A benign, self-limiting inflammation of the episclera, the thin tissue layer between theconjunctiva and sclera.
Key featuresinclude:
• Localized redness
• Mild eye discomfort or grittiness
• Often unilateral, but can be bilateral
🔑Core Features —Episcleritis vs. Scleritis:
• Episcleritis = superficial, mild, mobilevessels, blanch with phenylephrine
• Scleritis = deep, severe pain, fixed vessels, no blanching, risk of complications
🔍Mnemonic to remember:Epi is easy, sclerais serious.
💡Types ofEpiscleritis:
- Simple – flat, diffuse redness (like a blush)
- Nodular – visible, raised nodule; often lasts longer and linked to systemic disease
🦠Causes andAssociations:
• Idiopathic – ~70% of cases
• Autoimmune diseases – e.g. rheumatoid arthritis, lupus, IBD, granulomatosis with polyangiitis
• Infectious – herpes zoster/simplex, Lyme,syphilis, hepatitis B
• Other – gout (hyperuricaemia), rosacea, thyroideye disease, chemical/foreign body triggers
• Rare associations– e.g. T-cell leukemia, Wiskott-Aldrich syndrome, paraneoplastic syndromes
📊Epidemiology (UK):
• Incidence: ~41 per 100,000 annually
• Prevalence: ~53 per 100,000
• Most common in 20–50 year-olds
• Slight female predominance
• Often recurrent, particularly with systemicinflammatory conditions
🧠Pathophysiology:
• Immune-mediatedinflammation of superficial episcleral vessels
• Causes vasodilation and leakage,producing redness and irritation
🩺DifferentialDiagnosis – Red Eye Causes to Consider:
• Scleritis (deep, severe pain, doesn't blanch)
• Conjunctivitis (discharge, crusting)
• Uveitis (photophobia, blurred vision)
• Contact lens-related injury
• Posteriorscleritis (no redness, but deep pain and vision changes)
• Orbitalcellulitis, optic neuritis, retinal detachment (if atypical)
🔬Diagnosis:
• Clinical – basedon redness, vessel mobility, and pain level
• Phenylephrine test – blanching suggestsepiscleritis
• Slit lamp:superficial vessel dilation, nodule (if nodular type)
• Blood tests onlyif recurrent, nodular, or systemic symptoms (RA, ANA, uric acid etc.)
💊Management (UKMSRA-aligned):
• Lubricating drops – first-line for comfort
• Cool compresses
• Topical NSAIDs – e.g. ketorolac
• Topical steroids – short course for more severecases (with IOP monitoring)
• Oral NSAIDs – for nodular or persistentsymptoms
• Refer to ophthalmology if:
– Recurrent (>3episodes)
– Nodular + systemicdisease
– No improvement
– Uncertaindiagnosis (rule out scleritis)
📈Prognosis:
• Excellent – most resolve within 1–2 weeks
• Complications are rare
• Recurrencepossible, especially with underlying inflammatory conditions
• Rare progressionto scleritis or scleral thinning if untreated
🧠Quick Summary — MSRAEssentials:
• Episcleritis = benign, superficial, self-limiting
• Rule out scleritis with pain level,phenylephrine blanching, and vessel mobility
• Think systemic if recurrent or nodular
• Treatment: lubricants → NSAIDs → short steroids
• Prognosis: excellent, minimal complications
📚Episcleritis MSRARevision Resources:
📝 Revision Notes:
https://www.passthemsra.com/topic/episcleritis-revision-notes/
🃏 Flashcards:
https://www.passthemsra.com/topic/episcleritis-flashcards/
📖 Accordion Q&A Notes:
https://www.passthemsra.com/topic/episcleritis-accordion-qa-notes/
🧠 Rapid Quiz:
https://www.passthemsra.com/topic/episcleritis-rapid-quiz/
🔗Explore more revisiontools:
🌐https://www.passthemsra.com
🌐https://www.freemsra.com
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