Paediatrics: Chickenpox: Free MSRA Podcast

⚕️ FREE MSRA PODCAST – Chickenpox (Varicella)🎧 A clear, high-yield breakdown of this classic childhood viral rash – perfect for exam prep and real-life clinical scenarios.🧠 Key Learning Points📌 Definition• Chickenpox (varicella) is a highly contagious viral infection caused by the varicella zoster virus (VZV), presenting with a widespread, intensely itchy vesicular rash.📌 Causes & Risk Factors• Caused by varicella zoster virus (herpesvirus family)• Spread via respiratory droplets or direct contact with vesicle fluid• Risk factors: – No prior infection or vaccination – Young children, school/daycare attendance – Immunocompromised, pregnancy, newborns• Mnemonic: “No Immunity? New Infection!”📌 Pathophysiology• VZV enters through respiratory tract, replicates in mucosa, spreads via lymphatics and bloodstream (viremia)• Rash develops as virus reaches skin• Virus becomes latent in sensory ganglia and can reactivate later as shingles📌 Symptoms• Fever, malaise, headache• Characteristic rash: crops of red spots → papules → vesicles → pustules → crusts (all stages seen simultaneously)• Centrifugal spread: starts on trunk/face, spreads to limbs• Intense itching• More severe in adults, immunocompromised, pregnant women📌 Differential Diagnosis• Shingles (dermatomal, not widespread)• Impetigo• Dermatitis herpetiformis• Hand, foot and mouth disease• Guttate psoriasis• Stevens-Johnson syndrome📌 Diagnosis• Clinical diagnosis: typical rash + history• Lab confirmation: PCR of vesicle fluid (if diagnosis is unclear or high-risk patient)• Targeted investigations if complications suspected (CXR, lumbar puncture)📌 Management• Supportive care: – Paracetamol for fever – Antihistamines for itch (chlorphenamine at night) – Emollients/moisturisers (avoid calamine lotion) – Short nails, good hygiene – Isolate until all lesions crusted over• Antivirals (aciclovir): – High-risk groups: immunocompromised, pregnant, severe cases, adolescents, adults – Best if started within 24–72h of rash• VZIG for post-exposure prophylaxis in vulnerable non-immune individuals• Specialist advice: pregnancy, neonates, immunosuppressed📌 Complications• Bacterial skin infection (most common)• Pneumonia (esp. adults, pregnant, immunocompromised)• Encephalitis/cerebellar ataxia• Disseminated/haemorrhagic varicella• Other: arthritis, nephritis, otitis media📌 Prognosis• Excellent in healthy children – self-limiting in 1–2 weeks• Complications more likely in adults, immunocompromised, pregnancy, infants• Lifelong immunity after infection (recurrence very rare)📎 More MSRA Resources for Chickenpox📝 Revision Notes: https://www.passthemsra.com/topic/chickenpox-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/chickenpox-flashcards/💬 Accordion Q&A Notes: https://www.passthemsra.com/topic/chickenpox-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/chickenpox-rapid-quiz/🎯 Practice Quiz: https://www.passthemsra.com/quizzes/chickenpox/🎓 Full Course: https://www.passthemsra.com/courses/paediatrics-for-the-msra/#MSRA #MSRARevision #MSRATextbook #MSRAQuiz #MSRAQuestionBank #MSRAFlashcards #MSRAQ&ANotes #MSRAAccordions #MultiSpecialityRecruitmentAssessment #MSRAOnlineRevision #MSRARevisionWebsite #Chickenpox