Open AccessUsefulness of filtered unipolar electrogram morphology for evaluating transmurality of ablated lesions during pulmonary vein isolation
Author(s) -
Kogawa Rikitake,
Watanabe Ichiro,
Okumura Yasuo,
Mano Hiroaki,
Sonoda Kazumasa,
Nagashima Koichi,
Sasaki Naoko,
Ohkubo Kimie,
Takahashi Keiko,
Iso Kazuki,
Kurokawa Sayaka,
Nakai Toshiko,
Hirayama Atsushi
Publication year - 2016
Publication title -
journal of arrhythmia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.463
H-Index - 21
eISSN - 1883-2148
pISSN - 1880-4276
DOI - 10.1016/j.joa.2015.10.001
Subject(s) - medicine , pulmonary vein , ablation , cardiology , atrial fibrillation , catheter ablation , antrum , stomach
Background Although alteration of the amplitude and morphology of bipolar electrograms is used widely as a guide of the ablation effect, there is little information concerning unipolar electrograms. The amplitude and morphology of filtered bipolar (BP) and filtered unipolar (UP) electrograms were compared during pulmonary vein isolation in patients with atrial fibrillation. Methods BP (30–250 Hz) and UP (30–100 Hz) signals from the ablation catheter were recorded before and after each ablation point at the pulmonary vein antrum in 6 patients with atrial fibrillation. Results In the electrogram group with low‐voltage amplitude in BP electrograms before ablation (<0.5 mV), the reduction in amplitude after ablation was significantly greater in the UP than in the BP electrograms, whereas the reduction was similar between the two recording methods in the electrogram group with high‐voltage amplitude in BP electrograms (≥0.5 mV). Furthermore, the S wave in the UP electrograms disappeared at the sites of no pace capture after ablation, whereas no characteristic morphologic changes were observed in the BP electrograms. Conclusion Filtered UP electrograms may be useful in assessing the effectiveness of lesion formation.