Footnotes

• Twitter @Dr_Nazarian_EP

• Contributors TZ made substantial contributions to the conception or design of the work, the analysis or interpretation of data for the work, and drafting the work. SN made substantial contributions to revising it critically for important intellectual content. Both authors gave final approval of the version to be published and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests SN is a consultant for CardioSolv and Circle CVI; and principal investigator for research funding from Biosense Webster, ImriCor, Siemens, ADAS software and the US NIH. The University of Pennsylvania Conflict of Interest Committee manages all commercial arrangements. TZ has nothing to disclose.

• Provenance and peer review Commissioned; internally peer reviewed.