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Mapping and ablation of clinical spontaneous perimitral atrial tachycardias using an ultra–high-resolution mapping system

Published:September 29, 2020DOI:https://doi.org/10.1016/j.hrthm.2020.09.016

      Background

      Perimitral atrial tachycardias (PMATs) are common atrial tachycardias (ATs), yet their mechanisms vary.

      Objective

      The purpose of this study was to characterize clinical spontaneous PMATs using an ultra–high-resolution (UHR) mapping system.

      Methods

      The study included 32 consecutive PMATs in 31 patients who had undergone AT mapping/ablation using a UHR mapping system.

      Results

      Six, 10, 11, and 5 PMATs occurred in cardiac intervention-naïve (group A), post-lateral/posterior mitral isthmus linear ablation (group B), post-atrial fibrillation ablation without mitral isthmus linear ablation (group C), and post-cardiac surgery (group D) patients, respectively. Group A patients tended to be older, more likely were female, and had sinus node or atrioventricular conduction disturbances more frequently. A 12-lead synchronous isoelectric interval was observed in 15 PMATs (46.9%). Coronary sinus activation was proximal to distal or distal to proximal except in 3 PMATs with straight patterns due to epicardial gaps. Left atrial anterior/septal wall (LAASW) low-voltage areas were smallest in group B. Slow conduction areas (SCAs) were identified in 26 PMATs (81.2%) and were located on the LAASW in all group A and group D patients. Conduction velocity in the SCAs was slowest in group B. In group B, all PMATs were terminated by single applications, and the gaps were located epicardially in 5 of 10 (50%). Anterior (n = 23) or lateral/posterior (n = 9) mitral isthmus linear block was successfully created without any complications in all. Twenty-five concomitant ATs among 18 patients (58.1%) also were eliminated. During a median of 20.0 (11.0–40.0) months of follow-up, 28 patients (90.3%) were free from any atrial tachyarrhythmias.

      Conclusion

      An UHR mapping-guided approach with identification of the individual tachycardia mechanism should be the preferred strategy given the distinct and complex arrhythmia mechanisms.

      Graphical abstract

      Keywords

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