Posters 270Oversensing in subcutaneous implantable cardioverter-defibrillators71Early stimulation of the fast-conducting endocardium is the primary factor in reducing myocardial activation times for endocardial cardiac resynchronisation therap72The impact of age on outcomes in primary prevention icd recipients: a competing risks analysis73The effects of epicardial and endocardial pacing on the constituent waves of coronary flow: coronary resynchronisation74Manifestation of repolarisation and conduction abnormalities following exercise in concealed type 1 brugada75Delivering universal public access automated external defibrillators in the united kingdom: starting at the heart of the community76Under use of oral anticoagulation in new patient