In the presented study epicardially induced microwave lesions were evaluated using a novel 3D mapping system (CARTO XP™ QwikMap™) and histological results were compared with electrophysiological findings. After median sternotomy a linear epicardial lesion was induced at the right atrium of 8 female pigs using microwave energy. Subsequently, the histological and electrophysiological characteristics of the lesion were evaluated. Only in 4 out of the 8 animals a bidirectional conduction block could be achieved after 2 ablation sequences. The histologic evaluation showed that the macroscopically visible and continuous as well as histologically severe/transmural lesion is no reliable predictor for the existence of a bidirectional conduction block. For clinical application the intraoperative (online) electrophysiological evaluation of an epicardially produced microwave lesion, using for example a 3-D mapping system, would be feasible and desirable to improve the outcome perspectives.
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In the presented study epicardially induced microwave lesions were evaluated using a novel 3D mapping system (CARTO XP™ QwikMap™) and histological results were compared with electrophysiological findings. After median sternotomy a linear epicardial lesion was induced at the right atrium of 8 female pigs using microwave energy. Subsequently, the histological and electrophysiological characteristics of the lesion were evaluated. Only in 4 out of the 8 animals a bidirectional conduction block could...
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