Cardio: Complete Heart Block: Free MSRA Podcast

🩺 FREE MSRA PODCAST – Complete Heart Block: A Disconnected Beat 🫀When the heart’s upper and lower chambers stop talking to each other, things can get serious—fast. In this deep dive, we explore Complete Heart Block (third-degree AV block), a high-stakes topic for the MSRA and clinical practice.🎯 Here’s what we cover in this essential episode:– Definition & Overview • A total electrical disconnect between the atria and ventricles • Also called third-degree AV block • Results in independent atrial and ventricular rhythms (AV dissociation)– Causes • 👵 Degenerative conduction disease (age-related) • ❤️ Ischaemic heart disease, previous MI • 🔥 Myocarditis, congenital defects, autoimmune links (e.g. lupus) • 💊 Drug-induced: beta-blockers, calcium channel blockers, digoxin– Nodal vs Infranodal Blocks • Nodal = above or at the AV node → 🔹 narrow QRS, milder symptoms • Infranodal = below AV node → ⚠️ wide QRS, slower rate (<45 bpm), more unstable • Mnemonic: Nodal = Narrow + Nicer, Infra = Important + Impactful– Key Signs & ECG Findings • 💓 Regular but slow pulse (30–50 bpm) • ❌ No relation between P waves and QRS complexes • 📈 Look for capture beats, canon A waves, and variable S1 • Canon A waves = atrial contraction against a closed valve– Symptoms • 😵 Dizziness, syncope, fatigue • 🫁 Breathlessness, worsening heart failure • 💥 Risk of sudden cardiac death in unstable cases– Diagnosis • 📊 ECG is gold standard – unmistakable AV dissociation • 🔁 Holter monitor or loop recorders for intermittent cases • 🧠 EPS if location is unclear • 🫀 Echocardiogram to assess cardiac structure– Management • 🚨 Urgent pacing if unstable • 🔌 Permanent pacemaker = main treatment • 🚫 Stop causative meds (e.g., rate-limiters) • 💊 Treat underlying heart disease (e.g., CAD, cardiomyopathy)– Prognosis & Complications • 👍 With a pacemaker, prognosis is usually excellent • ⚠️ Complications include falls, bradycardia symptoms, and rarely cardiac arrest • Long-term outlook depends on underlying heart function📎 More MSRA resources on Complete Heart Block:📝 Revision Notes: https://www.passthemsra.com/topic/complete-heart-block-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/complete-heart-block-flashcards/🧩 Accordion Q&A: https://www.passthemsra.com/topic/complete-heart-block-accordion-qa-notes/🔗 Topic Page: https://www.passthemsra.com/?post_type=sfwd-topic&p=23532&preview=true🌐 Main Site: https://passthemsra.com🎁 Free Resources: https://freemsra.comHashtags#MSRA #CompleteHeartBlock #ThirdDegreeAVBlock #ECGInterpretation #MSRAFlashcards #MSRAAccordions #MSRAExamPrep #CardiologyMSRA #Pacemaker #PassTheMSRA #FreeMSRA #MSRARevisionTools #Bradycardia