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