Risk assessment in patients with symptomatic and asymptomatic pre-excitation.

"Conflict of interest: M.J.-U. is a consultant for Johnson & Johnson and Medtronic and has received research grants from Medtronic. N.D. and A.P.N. have received speaker fees from Johnson & Johnson. F.Å. is a consultant for Johnson & Johnson and Abbott. F.B. reports fees from committee work in trials sponsored by Medtronic and Biotronik. Industry-related activities as chair or speaker have been organized through F.B.’s employer with no payment being directly transferred to F.B. E.S. has received institutional consulting fees from lecture fees from Bayer, Bristol-Myers Squibb-Pfizer, Boehringer Ingelheim, Johnson & Johnson, and Merck Sharp & Dohme. All remaining authors have declared no conflicts of interest."

"Funding None declared."

"This prospective study included consecutive patients with documented ventricular pre-excitation, referred for assessment to the Arrhythmia Department at Karolinska University Hospital between August 2017 and December 2021. The study protocol was registered in the U.S. National Institutes of Health Clinical Trials Registry (ClinicalTrials.gov identifier: NCT03301935) and was approved by the Institutional Ethical Committee in Stockholm, DN:2016/1481-31/4 (2019-01205). Written informed consent was obtained from all patients."