Haem: Vitamin B12 Deficiency: Free MSRA Podcast

🎧 MSRA Podcast: Vitamin B12 Deficiency – Blood, Brain & Baffling SymptomsWelcome to another high-yield MSRA Deep Dive! This episode unpacks Vitamin B12 deficiency — from fatigue and glossitis to neurological confusion and cord demyelination. Whether you're revising or recognising it in practice, this guide makes it memorable.🧠 What You’ll Learn:✅ Definition• B12 deficiency = low levels of vitamin B12 → affects DNA synthesis, red blood cell production, and nerve health• Leads to megaloblastic anaemia and neurological symptoms✅ Common Causes• Pernicious anaemia (PA) – ↓ intrinsic factor from autoimmune gastritis• Vegan/vegetarian diets without B12 supplements• Malabsorption – Crohn’s, coeliac, ileal resection• Meds – PPIs, metformin• Rare genetic B12 transport issues📌 Mnemonic: AVG-PGLFA – Age (elderly)V – Vegan dietG – GI disordersP – Pernicious anaemiaG – Gastric surgeryL – Long-term medsF – Family history🧬 Pathophysiology• B12 needed for DNA synthesis + myelin• Deficiency → impaired cell division (anaemia)• Affects posterior columns → proprioception loss, paraesthesia🔍 Differential Diagnoses• Folate deficiency – similar blood picture, no neuro signs• Alcohol misuse, liver disease, hypothyroidism – macrocytosis• MS, diabetic neuropathy – neuro overlap📊 Epidemiology (UK)• PA: ~1 in 1000 (esp. women aged 40–70)• B12 deficiency: ~6% (<60 yrs), ~20% (>60 yrs)• Vegan deficiency risk: ~11%⚠️ Clinical Features – Mnemonic: 5Ps + Neuro CCC-HPallorParaesthesiaPeripheral neuropathyPsychiatric symptomsProprioception lossConfusion, Coordination issues, Cognitive decline, Heaviness in legsOther signs: Glossitis, fatigue, breathlessness🧪 Investigations• Serum B12 (may miss borderline cases)• Methylmalonic acid, Homocysteine – rise in deficiency• FBC: macrocytic anaemia, hypersegmented neutrophils• Anti-intrinsic factor, anti-parietal cell antibodies• Exclude: Folate deficiency, liver disease, hypothyroidism• Gastroscopy in PA (↑ gastric cancer risk)💉 Management• Hydroxocobalamin IM (NICE): – No neuro signs: 1mg IM 3×/week × 2wks → then 1mg IM every 3 months – With neuro: 1mg IM on alternate days until improvement• Oral B12: if purely dietary and no malabsorption• Always treat B12 before folate to avoid masking deficiency• Address cause: e.g. diet, meds, gut disorder• Monitor response via FBC + symptom resolution📈 Prognosis• Good if diagnosed early• Neurological damage can become permanent if treatment is delayed• PA = lifelong B12 replacement + cancer screening🛑 Complications if Untreated• Subacute combined degeneration of spinal cord• Irreversible neuropathy, gait disturbance• Severe anaemia → heart failure• NTDs in pregnancy, infertility• ↑ Homocysteine → possible CVD link• Gastric cancer risk in PA📚 MSRA Revision Resources📝 Notes:https://www.passthemsra.com/topic/vitamin-b12-deficiency-revision-notes/🃏 Flashcards:https://www.passthemsra.com/topic/vitamin-b12-deficiency-flashcards/📖 Accordion Q&A:https://www.passthemsra.com/topic/vitamin-b12-deficiency-accordion-qa-notes/🧠 Rapid Quiz:https://www.passthemsra.com/topic/vitamin-b12-deficiency-rapid-quiz/🧪 Online Quiz:https://www.passthemsra.com/quizzes/vitamin-b12-deficiency/🌐 More Platforms:https://www.passthemsra.comhttps://www.freemsra.com💭 Final Thought:Vitamin B12 deficiency is one of the most clinically significant, yet often missed deficiencies in practice. It impacts everything — from blood to brain. Check early, treat early, and never skip that B12 before folate!#MSRA #VitaminB12Deficiency #HaematologyMSRA #PassTheMSRA #PerniciousAnaemia #IntrinsicFactor #MegaloblasticAnaemia #GPExamPrep #NeurologyMSRA #MedicalEducation #FreeMSRA #B12Deficiency #UKMedicine #MSRAPodcast