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A. Complete heart block – Explanation

 

First degree heart block PR interval > 0.2 seconds
Second degree heart block  Mobitz type I (Wenckebach phenomenon) / phenomenon
  • Progressive prolongation of the PR interval until a dropped beat occurs

Mobitz type II AV block

  • PR interval is constant but the P wave i often not followed by a QRS complex (dropped beat)
Third degree (complete) heart block
  • P waves will occur regularly, usually at a rate of around 75 beats per minute but are completely unconnected to the rhythm of the QRS complexes.
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