Understanding Mobitz Type II (Second-Degree Heart Block) – ECG Analysis & Pathophysiology

In this video, we dive deep into Second-Degree Type II AV Block (Mobitz II) with a step-by-step ECG interpretation. We’ll analyze a real ECG strip, identify key features like irregular rhythms, PR intervals, and dropped beats, and explain the physiology behind conduction failure in the His-Purkinje system. 📌 Key Topics Covered: ✅ How to identify Mobitz II on an ECG ✅ Key differences between Mobitz I & Mobitz II ✅ Understanding fast sodium channels & ischemia's impact on conduction ✅ Why Mobitz II can progress to complete heart block Timestamps: ⏱ 00:00 – Introduction to Mobitz II (Second-Degree AV Block) ⏱ 00:02 – ECG Example: Step-by-Step Interpretation ⏱ 00:17 – Identifying Irregularly Irregular Rhythm ⏱ 00:38 – Recognizing P-Waves & PR Intervals ⏱ 01:50 – The Significance of Dropped Beats ⏱ 02:10 – Understanding SA Node, AV Node & His-Purkinje Conduction ⏱ 02:39 – Why the Impulse Fails to Conduct? ⏱ 04:09 – Fast Sodium Channels & the "All-or-Nothing" Conduction ⏱ 05:26 – Causes of Mobitz II: Ischemia & Structural Damage ⏱ 07:00 – How Membrane Potential Disruptions Lead to More Dropped Beats ⏱ 09:00 – Why Mobitz II Can Quickly Progress to Bradycardia ⏱ 10:00 – Summary & Key Takeaways