Neuro: Herpes Simplex Encephalitis: Free MSRA Podcast

🦠 FREE MSRA PODCAST – Herpes Simplex Encephalitis: Spotting the Silent Killer Early🎧 A clear, rapid-fire guide to the UK’s most important cause of viral encephalitis—what you must know for the exam, and to save lives on the wards.🧠 Key Learning Points📌 Definition• Herpes simplex encephalitis (HSE) = acute, life-threatening viral infection of the brain, usually due to HSV-1 (95% adults/children)• Leads to brain inflammation, rapid neurological decline, and permanent disability/death if not treated promptly📌 Causes & Risk Factors• HSV-1 reactivation (often after cold sores), travels along nerve pathways to brain (esp. temporal/frontal lobes)• HSV-2 mainly in neonates (acquired during birth)• Higher risk: immunocompromised, previous herpes infection, extremes of age, genetic factors📌 Pathophysiology• Virus enters CNS → direct neuronal injury + intense immune response → brain swelling, cell death• Classic sites: medial temporal & inferior frontal lobes📌 Differential Diagnosis• Other viral/bacterial encephalitis, autoimmune encephalitis, meningitis, brain abscess, cerebral vasculitis, SLE, stroke, tumours, MS, syphilis📌 Epidemiology• Rare: ~1 in 250,000/year UK• Any age, but peaks in childhood & older adults• Most common cause of sporadic, severe encephalitis📌 Symptoms• Acute onset fever, headache, confusion, personality/behaviour change• Seizures (very common), focal neurology (e.g. weakness, aphasia), altered consciousness/coma• Neonatal: lethargy, seizures, poor feeding, bulging fontanelle, shock, rash📌 Diagnosis• CSF (lumbar puncture): lymphocytosis, raised protein• PCR for HSV DNA on CSF = gold standard• MRI: temporal/inferior frontal lobe changes• EEG: diffuse slowing, periodic discharges (can help early)• Rule out mimics: FBC, blood cultures, renal/liver tests📌 Management• Immediate IV aciclovir (do not wait for confirmation if suspected!)• Admit to hospital; monitor neurology, fluids, electrolytes• Manage seizures aggressively (anticonvulsants as needed)• Supportive care: fluids, airway, ventilation if needed• Consider IV antibiotics initially to cover bacterial meningitis until excluded• Steroids: role uncertain—usually not first-line📌 Complications• High risk of permanent neurological deficits—memory loss, seizures, behavioural change, cognitive impairment• Death if untreated (~70–80%); with treatment ~10–20% mortality• Chronic epilepsy, recurrent encephalitis, neuropsychiatric sequelae, dependency📌 Prognosis• Time is brain! Early aciclovir is crucial• Many survivors have lasting problems despite optimal treatment• Poorer outcome: older age, immunosuppression, coma, ventilation, thrombocytopenia📎 More MSRA Resources for Herpes Simplex Encephalitis:📝 Revision Notes: https://www.passthemsra.com/topic/herpes-simplex-encephalitis-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/herpes-simplex-encephalitis-flashcards/💬 Accordion Q&A: https://www.passthemsra.com/topic/herpes-simplex-encephalitis-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/herpes-simplex-encephalitis-rapid-quiz/🎓 Neurology Course: https://www.passthemsra.com/courses/neurology-for-the-msra/#HerpesSimplexEncephalitis #HSE #MSRARevision #MSRAFlashcards #MSRAQuiz #NeurologyMSRA #HSV1 #Acyclovir #Encephalitis #PassTheMSRA #MSRAPodcast #ViralEncephalitis #Neurology #ExamPrep #SpotTheDiagnosis