1 Clinical impact of cardiovascular magnetic resonance with optimized myocardial scar detection in patients with cardiac implantable devices. Anish N Bhuva MBBS a,b , Peter Kellman PhD c , Adam Graham MBBS d , Manish Ramlall MBBS a , Redha Boubertakh PhD a , Patricia Feuchter MSc a , Angela Hawkins MSc d , Martin Lowe MD PhD d , Pier D. Lambiase MD PhD b, d , Neha Sekhri MBBS a , Richard J Schilling MD FRCP d , James C Moon MD a,b , Charlotte H Manisty MBBS PhD a,b Affiliations a. Department of Cardiovascular Imaging, Barts Heart Centre, St Bartholomew’s Hospital, London, UK b. Institutes for Cardiovascular Science, University College London, London, UK c. National Institutes of Health, Bethesda, USA d. Department of Cardiac Electrophysiology, Barts Heart Centre, St Bartholomew’s Hospital, London, UK All authors agree to the following statement: “This author takes responsibility for all aspects of the reliability and freedom from bias of the data presented and their discussed interpretation” Abstract word count: 240 words. Article word count: 3360 words. Funding: AB is supported by a doctoral research fellowship from the British Heart Foundation (FS/16/46/32187). JCM, PDL and CM are directly and indirectly supported by the University College London Hospitals, National Institute for Health Research Biomedical Research Centre and Biomedical Research Unit at Barts Health NHS Trust. Competing interests statement: The authors report no relationships that could be construed as a conflict of interest. Corresponding author: Dr Charlotte Manisty, Department of Cardiac Imaging, Barts Heart Centre King George V Building, West Smithfield, London EC1A 7BE United Kingdom Email: c.manisty@ucl.ac.uk Telephone: 0044 (0) 203 465 6115 Fax: 0044 (0)203 465 3086 Keywords: pacemaker; defibrillator; cardiovascular magnetic resonance; wideband; late gadolinium enhancement; fibrosis.