A novel method to define critical isthmus of left atrial tachycardia; late potential mapping during sinus rhythm

Abstract Funding Acknowledgements Type of funding sources: None. Background Atrial tachycardia (AT) is a commonly encountered rhythm disorder in patients with underlying atrial scar. The role late potential (LP) based mapping the detection AT critical isthmus has yet to be systematically evaluated. Purpose We aimed investigate relationship between LPs (ALP) localization sinus and re-entrant ATs low-voltage areas. Methods Thirty-five symptomatic [mean age: 62 ±9, gender: 25 (71.4%) female] left AT, who had undergone catheter ablation, were enrolled. Voltage LP performed both atriums. Low voltage areas signals continuous-fragmented morphology tagged. Isochronal activation (ILAM) was also all procedures. After induction during detect sites tachycardia. Results Activation indicated single re-entry 30 ≥1 5 patients. Localized observed 20 (51.2%) patients, macro 18 (46.1%), biatrial 1(2.5%). mean fractionated electrogram duration termination site calculated at 134.3±46.7 ms bipolar 0.17±0.12 mV. ALPs tagged (64.1%) on anterior wall, 12 (34.3%) roof, (12.8%) septal wall 2 (5.7%) Bachmann’s Bundle region. All latest activated zones ILAM localized predicted successful ablation terminate AT. Freedom from tachyarrhythmias (ATAs) 78.7% six months follow-up 338 ±226 days. Conclusion Our findings demonstrated utility predict for ATs. These displayed signal sinus/paced correlation detected mapping.