<p><b>Ruth Willis</b>, BVM&S, DVC, MRCVS, is an RCVS Recognised Specialist in Veterinary Cardiology at Holter Monitoring Service, Dick White Referrals, Newmarket UK; and an Honorary Associate Professor at the University of Nottingham, UK. <p><b>Pedro Oliveira</b>, DVM, Diplomate ECVIM-CA (Cardiology), MRCVS, is an RCVS Recognised Specialist in Veterinary Cardiology at Davies Veterinary Specialists in Hertfordshire, UK, where he has established an electrophysiology laboratory for the invasive diagnosis and treatment of cardiac arrhythmias. <p><b>Antonia Mavropoulou</b>, DVM, PhD, Diplomate ECVIM-CA (Cardiology), MRCVS, is an RCVS Recognised Specialist in Veterinary Cardiology at Davies Veterinary Specialists in Hertfordshire, UK.