Opthal: Mydriasis: Free MSRA Podcast

🎧 MSRA Deep Dive: Mydriasis – Dilated Pupils, Big CluesToday we unravel mydriasis — abnormally dilated pupils, often a sign of deeper neurological or systemic pathology. Whether it signals brain injury, drug effects, or benign causes, this is a must-know MSRA topic.👁️ Definition• Mydriasis = dilated, poorly reactive pupils• Can be unilateral or bilateral• Not a diagnosis but a clue to underlying pathology🧠 Mnemonic: "MAD NURSES TAKE SOME SUBSTANCES"• Medications (atropine, SSRIs, TCAs)• Anticholinergics, sympathomimetics (amphetamines, cocaine)• Drug misuse• Neurological: 3rd nerve palsy, Adie’s, Holmes-Adie• Underlying trauma (head/orbital)• Reflex/reactive causes• Systemic disease (diabetes, pheochromocytoma)• Surgical or iatrogenic🔍 Differentials• Pharmacological: Meds or recreational drugs• 3rd nerve palsy: Mydriasis + ptosis + eye movement abnormality• Adie’s tonic pupil: Unilateral, slow light response, normal accommodation• Ocular trauma, iridoplegia• Horner’s syndrome: Usually miosis but worth remembering👁️ Clinical Features• Dilated pupil(s), slow/no light reaction• Photophobia, glare, blurred vision• Ptosis/diplopia if cranial nerves affected• Associated systemic or neuro symptoms🩺 Investigations• History: meds, trauma, substance use• Light and accommodation reflex testing• Full neuro exam• Imaging (CT/MRI) if suspect lesion or trauma• Toxicology screen if drug-related cause likely💊 Management• No direct treatment — manage the cause: – Stop culprit drugs – Neuro causes → urgent referral – Adie’s → pilocarpine (for symptoms) – Trauma/surgery → ophthalmology input📈 Prognosis & Complications• Often reversible (e.g., drugs)• May be permanent if due to nerve damage or trauma• Complications: – Light sensitivity – Blurred vision – Missed diagnosis (e.g. 3rd nerve palsy or brain herniation)📚 MSRA Quick Summary• Always check for medication use and neuro signs• Don’t miss 3rd nerve palsy: dilated pupil + ptosis + eye deviation• Adie’s = benign but requires recognition• Mydriasis = sign, not disease — think broadly and investigate🧠 Quiz Tips• SSRIs + dilated pupils? → Think anticholinergic tox• Ptosis + dilated pupil + eye deviation → 3rd nerve palsy• Unilateral slow-reactive pupil + intact accommodation in young woman? → Adie’s🧩 Reflection PromptIf dilated pupils signal major pathology, what subtle signs are you missing in daily exams?📚 Mydriasis MSRA Resources:📝 Notes: https://www.passthemsra.com/topic/mydriasis-revision-notes/🃏 Flashcards: https://www.passthemsra.com/topic/mydriasis-flashcards/📖 Accordion Q&A: https://www.passthemsra.com/topic/mydriasis-accordion-qa-notes/🎯 Rapid Quiz: https://www.passthemsra.com/topic/mydriasis-rapid-quiz/🧠 Full Quiz: https://www.passthemsra.com/quizzes/mydriasis/🌐 More: https://www.passthemsra.com | https://www.freemsra.com#MSRA #Mydriasis #Ophthalmology #MSRARevision #3rdNervePalsy #AdiesPupil #DilatedPupil #PassTheMSRA #FreeMSRA #GPTraining #Photophobia #MedicalEducation #NeuroRedFlags