Junctional Beats During Cryo-Ablation Of The Slow Pathway For The Elimination Of Atrioventricular Nodal Reentrant Tachycardia.

The patient was a 39-year-old female with recurrent paroxysmal, regular narrow QRS complex tachycardia. Atrioventricular nodal reentrant tachycardia (AVNRT) was induced. The cryo-ablation attempts (-80°C, 240 second) were performed in the inferior-posterior triangle of Koch. We observed several junctional beats during cryo-ablation. After successful cryo-ablation, AVNRT induction was repeatedly checked during a waiting period of 30 minutes without recurrence. In our case we demonstrated that junctional beats can be observed during cryo-ablation. We believe this to be the first description of junctional beats occurring during cryo-ablation of AVNRT.