3405Transseptal endocardial left ventricular lead implantation is an effective and feasible method and exerts long lastig beneficial haemodynamical effects after failed CRT implantation. (28th August 2018) - Geller, L A; Sallo, Z; Molnar, L; Tahin, T; Szilagyi, S Z; Osztheimer, I; Zima, E; Apor, A; Nagy, A I; Szegedi, N; Papp, R; Nagy, K V; et al.