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AF with Aberrancy

February 15th, 2021


Atrial fibrillation in the presence of either bundle branch block or pre-excitation (accessory pathway) will result in an irregular wide complex tachycardia that may be mistaken for polymorphic VT. It is important to carefully check the ECG for the typical highly irregular rhythm of atrial fibrilation.
  • Look For

  • Heart rate 100-250bpm
  • Irregular rhythm
  • Broad QRS complex >120ms
  • On Old ECGs

  • Atrial fibrillation
  • Bundle branch block
  • Wolff-Parkinson-White pattern
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