Autocapture algorithm behaviour in left bundle branch pacing

Abstract Funding Acknowledgements Type of funding sources: None. Introduction Autocapture algorithms allow remote monitoring patients, reducing the need for face-to-face hospital consultations and increasing patient safety. These are widely validated in patients with conventional pacing not recommended His bundle pacing, but there is no information on its behaviour left branch (LBBP). Purpose The objective was to analyse autocapture algorithm LBBP differences manual thresholds during device first programming (acute phase), after 1-7 days (subacute phase) 1-3 months later (chronic phase). Methods Prospective non-randomised single-centre comparative study. Consecutive an indication cardiac were included. implant performed area or right ventricle endocardium (outflow tract apex) at discretion operator. considered according published criteria. activated both groups whenever allowed by device. measurement intracavitary electrogram surface electrocardiogram. Results Sixty included, 40 20 pacing. Baseline characteristics shown Figure 1. feasibility more frequent late phases, a favourable trend toward bipolar (Figure 2A). failures activation mainly due absence adequate safety margins (90.9% 86.6% LBBP), rest attributable atrial tachyarrhythmias (9.1 6.7%, respectively) electrical noise (remaining 6.7% LBBP). In group, statistically significant between automatic except subacute phase (unipolar) 2B), remained stable follow-up (average increase 0.46V). Conclusions feasible LBBP, Automatic similar they remain follow-up.