QRS fragmentation is associated with increased risk of ventricular arrhythmias in high-risk patients; Data from the SMASH 1 Study.

"CONFLICT OF INTEREST Dr. Røsjø has received personal fees from Thermo Fischer BRAHMS, CardiNor and SpinChip Diagnostics. Dr Kjekshus has served on advisory boards and received speaker fees from Bayer and Pfizer. Dr. Omland has served on advisory boards for Abbott Diagnostics, Roche Diagnostics, and Bayer and has received research support from Abbott Diagnostics, Novartis, Roche Diagnostics, Singulex, and SomaLogic via Akershus University Hospital, and speaker's or consulting honoraria from Roche Diagnostics, Siemens Healthineers, and CardiNor. Dr. Myhre has served on advisory boards and received speaker fees from AmGen, AstraZeneca, Bayer, Boehringer Ingelheim, Novartis, and Novo Nordisk. All other authors report no conflict of interest."

"Funding information Drs. Sourour and Myhre were supported by grants from the South‐Eastern Norway Regional Health Authority. Dr. Riveland is supported by a grant from the Western Norway Regional Health Authority."