The difference between Mobitz type I and type II second degree heart blocks on an ECG is determined by the variations in the PR interval just prior to the "dropped" QRS complex.



// MORE EKG/ECG VIDEOS:

First Degree Heart Block    • First Degree AV Block   EKG (ECG) In...  
Second Degree Heart Block    • Second Degree Heart Block   Electroc...  



// ADDITIONAL READING

Mobitz I vs. Mobitz II (Article)
https://www.nucleotype.com/cardiogram...



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