Cardinal ECG Features

The cardinal ECG features of AV-nodal re-entrant tachycardias are:

  • Always narrow complex (unless pre-existing bundle branch block)
  • P wave simultaneous with QRS (see image)

Learning Bite

In nodal re-entry tachycardia ventricular and atrial (retrograde) depolarisation is simultaneous, so the P waves are buried in the QRS complex.

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