Atrioventricular block classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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Classification

• First degree AV block
  • Prolongation of PR interval
• Second degree AV block also known as Mobitz I and Mobitz II
  • Type I AV Block (Wenckebach)
    • Progressive prolongation of the PR interval before dropped beat.
    • Usually block is in the AV node
  • Type II AV Block
    • No change in PR interval before dropped beat
    • Usually infranodal
• Third degree AV block also known as complete heart block
  • No relationship between atrial and ventricular activity.