Third-Degree AV Block (Complete Heart Block) Explained | ECG Interpretation, Escape Rhythms & Pacemaker | Daily Cardiology

Catching a 3rd Degree AV Block on an ECG A 3rd degree AV block (complete heart block) is electrical divorce between the atria and ventricles. What is a 3rd Degree AV Block? In a normal heart, the atria and ventricles work in sync — the SA node fires, the AV node passes it along, and the ventricles contract. In 3rd degree block, that connection is completely lost. ✅ Atria fire on their own (P waves from the SA node) ✅ Ventricles fire on their own (escape rhythm from AV junction or below) 🚫 But t

🫀Complete heart block, aka third-degree atrioventricular (AV) block occurs when there is a complete interruption or blockage in the electrical signals between the upper chambers (atria) and lower chambers (ventricles). Because signals are getting blocked, there is no association between the P waves and the QRS complexes causing them both beat independently of each other. The atria maintain their own rhythm, and the ventricles establish a separate rhythm.⁣ ⁣ 𝗦𝘆𝗺𝗽𝘁𝗼𝗺𝘀⁣ Patients with compl