AV blocks

First Degree AV Block
- Prolonged PR interval (>200msec) but constant and always conducts
Second Degree
- Second Degree AV Block Type I (Wenckeback)
  - Progressive prolongation with intermittent dropped QRS complexes
  - Progressively shortening RR intervals
- Second Degree AV Block Type II
  - PR interval is constant with intermittent P waves not conducting QRS complexes
  - Surrounding RR intervals are constant
Third Degree
- Complete Heart Block - no AV conduction
- Dissociation between P waves and QRS complexes

Video

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