Wide QRS tachycardia at a rate of 300 per min

What are the possible types of Wide QRS tachycardia at a rate of 300 per min?

  1. Atrial fibrillation with Wolff–Parkinson–White syndrome (WPW) – rate is fast due to conduction through accessory pathway with low refractory period as well as through AV nodal pathway
  2. Polymorphic ventricular tachycardia
  3. Atrial flutter with 1:1 conduction
  4. Ventricular tachycardia or supraventricular tachycardia with aberrancy in the very young

Common form of wide QRS tachycardia is monomorphic ventricular tachycardia (VT or V-tach), which as a much lower rate, usually between 150 – 200/min.