What ECG changes characterize the different types of heart block? | Medibuddy
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16th May 2025

What ECG changes characterize the different types of heart block?

  • 1st Degree: Prolonged PR interval (>200 ms).
  • 2nd Degree Type I (Mobitz I): Progressive PR lengthening until a beat is dropped.
  • 2nd Degree Type II (Mobitz II): Intermittent non-conducted P waves without PR prolongation.
  • 3rd Degree (Complete): No relationship between P waves and QRS complexes.

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