Usefulness of omnipolar technology near field for accessory pathway ablation through the coronary sinus

✓A peak frequency map of omnipolar technology near field (OTNF) distinguished exact locations of the accessory pathways passing through an epicardial bypass of the coronary sinus from the far-field potential of the Kent bundle obtained in endocardial left atrial mapping.✓The accessory pathway location could be determined using an emphasis map combined with a local activation map and peak frequency map, resulting in successful ablation.✓A novel mapping algorithm of OTNF can facilitate further understanding of the complex mechanisms underlying the electrical properties of the human heart.