Introduction
Catheter ablation has become the indispensable treatment strategy for
cardiac arrhythmias1. Detailed 3D mapping can identify
the reentrant circuit or origin of tachyarrhythmias and has been very
important tool for catheter ablation. Rhythmia mapping system (Boston
Scientific, Washington, DC), which uses a small basket array with
64-polar mini-electrodes (IntellaMap Orion, Boston Scientific), enables
rapid ultra-high-density mapping in a short time2-4.
The most advantage of this system was little need for additional manual
annotation and easily identifies the reentrant
circuit3-4. Previous reports had demonstrated the
usefulness of this system for several complex arrhythmias such as an
atrial tachycardia after congenital heart disease surgery, and
ventricular tachycardia5-8. However, there were only a
few reports of investigation about the efficacy of this system in
patients with accessory pathway (AP). We previously reported that
Rhythmia system can create the atrio-ventricular dual chamber mapping,
which would be useful to understand the details of the connection of the
AP between atrium and ventricle9. We hypothesized that
the atrio-ventricular dual chamber map would be useful for the effective
radiofrequency (RF) application to the AP patients. The aim of this
study was to investigate the utility of Rhythmia system for catheter
ablation of AP.