Abstract
Introduction: We tested a new mapping system (Rhythmia Medical) for high resolution automated electro-anatomical mapping (HRAM) in patients with macroreentrant atrial tachycardia (Macro-AT). Methods: The system uses an 8F deflectable catheter with basket array (1.6 cm diam) of 8 splines of 8 electrodes (2.5 mm spacing), totaling 64 electrodes. The system automatically generates chamber geometry and a HR activation map using all electrograms (EGMs) recorded within 5 mm of the chamber surface. The system automatically acquires EGM and location information based on EGM stability and respiration phase. In 10 patients with LA Macro-AT (4 pts), RA Macro-AT (1 pt), Typical AFL (4 pts) or AF (1 pt), HRAM were obtained during Macro-AT or AFL (6 pts) or CS pacing (4 pts). Conventional point-by-point 3D maps were also obtained in 7 pts during Macro-AT or CS pacing. Results: The new system produced very HR maps from 6026±3506 EGMs, obtained in only 11.5±4.5 min. Compared to conventional point-by-point maps in 7 pts, HRAM included more EGM sites (6525±1739 vs 378±58), had higher resolution and required less time (11±3 min vs 30±3 min). HRAM successfully identified the channel in AT circuit and confirmed isthmus block in AFL pts. Conclusions: The new HRAM system accurately and quickly identified the RA or LA macroreentrant circuit.
Published Version
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