Atrio-Ventricular Reentrant Tachycardia (AVRT) and Wolff Parkinson White (WPW) Syndrome.
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AVRT (or Atrio-Ventricular Reentrant Tachycardia) and Wolff Parkinson White (WPW) syndrome is due to the presence of an abnormal electrical connection between the atria and ventricles called an accessory pathway.