The invention refers to an implantable medical device (100) comprising a control unit (62), at least a right ventricular sensing unit (58) and/or a right atrial sensing unit, wherein the right ventricular sensing unit (58) is connected or can be connected to a right ventricular stimulation electrode lead (110) having at least one electrode pole and a stimulation unit (54) that is connected or can be connected to a multipolar left ventricular stimulation electrode lead (114) having a plurality of electrode poles (141, 142, 143, 144). The control unit (62) is adapted to determine right atrioventricular conduction state and to cause selection of one of the plurality of electrode poles (141, 142, 143, 144) of the multipolar left ventricular stimulation electrode lead (114) depending a respective determined right atrioventricular conduction state.
