Next, let's look at second degree type 2 heart block. How can you differentiate type 1 and type 2? In type 2 (or Mobitz II), there are ✨intermittently non-conducted P waves✨ This is just a fancy way of saying that every once in a while, some of the P waves are NOT followed by a QRS complex. We have those "dropped beats", where the atria contract, but the signal doesn't get to the ventricles...so the ventricles don't contract! The key difference is that in second degree type 2, there is NO length

Second Degree Type 1 (also known as Mobitz I or Wenckebach) is another type of AV block. It is characterized by progressive prolongation of the PR interval...followed by a blocked ⛔ P wave. What's a blocked P wave? When a P wave doesn't "get through" and there is no resulting QRS complex! Essentially, we see the atria fire, but the signal doesn't make it to the ventricles. This is also called a 'dropped' QRS complex. After the dropped QRS complex, the PR interval resets - and the cycle repeats!

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