Haem: Autoimmune Haemolytic Anaemia: Free MSRA Podcast

🎧 Podcast Episode: Autoimmune Haemolytic Anaemia – MSRA Deep DiveToday, we're diving into a fascinating and high-yield haematology topic for the MSRA: Autoimmune Haemolytic Anaemia (AIHA). 🎯🩺 What You’ll Learn:• Definition:Autoimmune haemolytic anaemia is an acquired condition where autoantibodies mistakenly target and destroy red blood cells → resulting in haemolysis and anaemia.• Types of AIHA:🔥 Warm AIHA (IgG):Active at 37°CExtravascular haemolysis (mainly in the spleen)Mnemonic: “Warm hugs (IgG)”❄️ Cold AIHA (IgM):Active at 4°CIntravascular haemolysis via complementLinked to cold symptoms, e.g. Raynaud’sMnemonic: “Cold snap (IgM)”🔎 Causes – Think AIMM:A mnemonic to remember common secondary causes:AIMM = Autoimmune, Infections, Medications, Malignancies• Autoimmune: e.g. SLE, ALPS• Infections: EBV, Mycoplasma pneumonia• Medications: Methyldopa, penicillins, cephalosporins• Malignancies: Lymphoma, CLL⚠️ Some cases are idiopathic (unknown cause)🧪 Pathophysiology:• IgG antibodies → red cells opsonised → cleared by splenic macrophages = warm type• IgM antibodies → activate complement cascade → intravascular lysis = cold type• Red cell lifespan drops from 120 days → sometimes just days• Bone marrow can’t compensate fast enough → anaemia develops🧠 Differentials to Know:Distinguish AIHA from:• Hereditary spherocytosis – positive family history, spherocytes• Drug-induced haemolysis – direct causative agent• Paroxysmal nocturnal haemoglobinuria (PNH) – dark morning urine, flow cytometry• Cold agglutinin disease – triggered by cold, specific cold agglutinin test• Sickle cell/thalassaemia – haemoglobinopathies with early onset🧬 Investigations:• FBC: Anaemia with raised reticulocyte count• Blood film: Spherocytes in warm AIHA• Raised: LDH, unconjugated bilirubin• ↓ Haptoglobin (used up mopping up Hb)• Direct Coombs Test (DAT): Positive = confirms AIHAWarm: IgGCold: C3 complement• Cold agglutinin titre if suspected• Additional: Check spleen size, autoimmune screen, lymphoma workup💊 Management Strategies:🟠 Warm AIHA:• 1st line: Corticosteroids (e.g. prednisolone)• If refractory/relapsing: Rituximab or immunosuppressants• Splenectomy if non-responsive• Folate supplementation (due to increased turnover)• Blood transfusion if severe – but crossmatch can be tricky🧊 Cold AIHA:• Avoid cold exposure – this is the cornerstone• Rituximab may help• Steroids/splenectomy = less effective• Transfusions sometimes needed (warm the blood)🩸 General Support:• Stop any trigger meds• Treat underlying infections or malignancies• Monitor for complications like heart strain, infections, iron overload, gallstones🔁 Prognosis:• Highly variable• Some cases = single episode with full recovery• Others = chronic, relapsing course needing long-term management• Underlying cause (e.g. SLE, CLL) plays a big role in outlook• Risk of infections (due to immunosuppression), gallstones, and treatment side effects🧠 Revision Recap:• Warm AIHA = IgG, spleen, steroids + Rituximab• Cold AIHA = IgM, complement, cold avoidance• DAT positive confirms autoimmune haemolysis• Mnemonic: AIMM (Autoimmune, Infections, Meds, Malignancy)📚 MSRA Resources – AIHA:📝 Revision Noteshttps://www.passthemsra.com/topic/autoimmune-haemolytic-anaemia-revision-notes/🧠 Flashcardshttps://www.passthemsra.com/topic/autoimmune-haemolytic-anaemia-flashcards/❓ Accordion Q&Ahttps://www.passthemsra.com/topic/autoimmune-haemolytic-anaemia-accordion-qa-notes/🔥 Rapid Quizhttps://www.passthemsra.com/topic/autoimmune-haemolytic-anaemia-rapid-quiz/🧪 Bonus Quizhttps://www.passthemsra.com/quizzes/autoimmune-haemolytic-anaemia/🎯 Final Takeaway:AIHA is a perfect example of immune dysregulation — a system gone rogue. 💉🩸#MSRA #Haematology #AutoimmuneHaemolyticAnaemia #AIHA #WarmAIHA #ColdAIHA #MSRARevision #MSRAFlashcards #MSRAQandA #MedicalPodcast #MSRAOnlineRevision #TheDeepDive