2 | METHODS
Since June 2019, we use ancillary VOM-EI for mitral isthmus ablation. We perform mitral isthmus ablation for peri-mitral flutter or as part of an ablation strategy to treat persistent atrial fibrillation resistant to pulmonary vein isolation, if peri-mitral flutter is suspected to be a perpetuating factor. Consecutive patients undergoing VOM-EI until August 2020 were included in this study. All patients undergoing atrial fibrillation ablation at our centre are included in a prospective registry. This registry has been approved by the local ethics committee. All patients provided written informed consent to participate in the registry.