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 patients with atrial fibrillation: a clinical practice research datalink study77Complete extraction of abdominal pacing and icd leads- a unique case series78The impact of adjunctive complex fractionated atrial electrogram ablation and linear lesions on outcomes in persistent atrial fibrillation: a meta-analysis79Analysis of two novel risk calculators for the prediction of cardiac implantable electronic device infection80General anaesthesia improves the success rates of pulmonery vein isolation for paroxysmal atrial fibrillation ablation: Table 1