Abstract: An implantable electrostimulation device having at least three input channels, (each forming a sensing channel), which are each connected to at least one electrode or to one terminal for an electrode, using which at least three different electrical potentials accompanying an excitation of cardiac tissue (myocardium) in a heart may be detected. Uses a signal processing unit which is connected to the input channels and is implemented to analyze the time curve of the potentials detected via the three sensing channels as three input signals in chronological relation to a periodically repeating trigger signal, which triggers a time window, and which is also implemented to detect predefined signal features for each of the three input signals within the time window triggered by the trigger signal, store them, and compare them to corresponding signal features of preceding time windows or of another input channel within the same time window.

Abstract: Endocardial or intravascular cardiac pacemaker having a sealed housing, in which a battery and a pacemaker controller connected to the battery, as well as at least one stimulation pulse generator, are situated, the housing being oblong and having a length of less than 70 mm and a cross-sectional area of less than 100 mm2 and carrying at least two electrodes, each of which has an outwardly directed, electrically conductive surface and is implemented as a stimulation electrode and is at least sometimes electrically connected to the stimulation pulse generator via an electrical connection situated in the interior of the housing.