Transseptal Supravalvular Far-Field Potential Mapping of Ventricular Premature Contractions Originating Around the Superior Mitral Annulus.

Competing Interests: Funding Support and Author Disclosures The Section of Arrhythmia is supported by an endowment from Abbott Japan, Boston Scientific Japan, and Medtronic Japan. Dr Hirata chairs the Section, and Drs Fukuzawa and Takami belong to the Section. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.