Major findings
In this report, we demonstrate a phenomenon of aberrancy being essential for certain ORT cases. The major findings included:
  1. In the cases of ORTs relying on aberrancy, all APs are anterolateral pathways located on the same side of BBB.
  2. Clinical tachycardia episodes were often short in time.
  3. Stimulation during single bundle branch refractoriness is required for inducing tachycardia.
  4. Resolution of aberration was followed by the shortening of subsequent VA interval which was responsible for tachycardia cessation.
  5. The block site of tachycardia after BBB resolution can be AP or AV node.