 1. Pilotphase It shall be determined whether a randomized positioning of ventricular leads at 2 defined positions either Group A: Positioning at right ventricular apex or Group B:. Positioning at right ventricular high septum is feasible. Included patients will already by examined and followed according to protocol. After having proved feasibility of randomized positioning, the data of these patients shall be used for evaluation of the V-PASS study. 