Third-Degree AV Block (Complete Heart Block) ECG Explained | ECG Interpretation made easy

Third-Degree AV Block (Complete Heart Block) ECG Explained | ECG Interpretation made easy


Third-degree AV block, also known as complete heart block, is one of the most dangerous cardiac conduction abnormalities—and recognizing it on ECG can be life-saving.

In this detailed cardiology video, we break down complete AV block step by step, explaining how atrial and ventricular electrical activity become completely dissociated. You’ll learn how to identify third-degree AV block on ECG, understand the difference between junctional escape rhythms and ventricular escape rhythms, and recognize why this condition often requires urgent pacemaker therapy.

This video covers:
✔️ What is third-degree (complete) AV block
✔️ Complete AV dissociation explained simply
✔️ How to march P waves and QRS complexes on ECG
✔️ Junctional vs ventricular escape rhythms
✔️ Narrow vs wide QRS complexes in complete heart block
✔️ Why PR intervals vary in 3rd degree AV block
✔️ Clinical dangers and complications
✔️ When a pacemaker is required

Whether you are a medical student, nursing student, resident, ECG learner, or practicing clinician, this video will help you master third-degree AV block ECG interpretation with confidence.


📌 Why this topic matters?
Complete heart block can cause syncope, hypotension, heart failure, and sudden cardiac death if not recognized early. Understanding its ECG patterns is essential for exams and real-world clinical practice.


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