Third degree AV block

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Background

  • Atria and ventricles beat independently from each other
  • Congenital or acquired
  • Acquired
    • Ischemia
    • Drugs
    • Structural heart disease

Clinical Features

Diagnosis

Rhythm 3rdAVblock.jpg
  • No atrial impulses are conducted
    • P waves normal and regular P-P intervals unrelated to slower regular R-R intervals
    • QRS narrow if block above bundle of His
    • QRS wide if block below bundle of His
    • PR variable

Management

See Also

References