A device for epicardial support and/or the assuming of cardiac activity having a double membrane (1) consisting of an elastic inner membrane (2) and a non-expandable outer membrane (3) as well as a closed cavity (4) formed therebetween which can be inflated and deflated by means of a fluid. With the objective of further developing a device of the type as indicated at the outset which provides a simpler possibility of stimulating the heart in the critical post-operative phase, it is provided for at least one probe/electrode unit (7, 8) to be arranged on the inward facing side (6) of the inner membrane (2) to the heart (5) for epicardial ECG leads and/or signal transmission/conversion of an external pacemaker.