P.1. Supraventricular Arrhythmias: P.1.13 Noncontact Mapping in Assessment of Postincisional Atrial Tachycardia Radiofrequency Ablation

Noncontact mapping with the ensite 3000 System was used to guide ablation of Postincisional intraatrial tachycardia. The purpose of this study was to report anatomy particularities and arrhythmia mechanism using noncontact mapping.

In three patients (age 33 ± 10 years; 3 women) with postincisional tachycardia after correction of atrial septal defect, radiofrequency catheter ablation was performed using noncontact mapping. We created three-dimensional electroanatomical map of the right atrium during the tachycardia. Electrophysiological data were collected. We observed one area electrical inactive in right atrial atrium corresponding to the anatomical scar from surgical atriotomy in all patients, the reentrant circuit between the lower border of atriotomy and crista terminalis close to the inferior vena cava in one patient and the tachycardia circuit around the atriotomy scar in two patients. The radiofrequency applications (8 ± 3) guided by the noncontact mapping terminated the tachycardia.

Noncontact mapping in our study proved to be an effective and safe method for radiofrequency ablation of postincisional atrial tachycardia.