Apparatus for detecting fusion events upon electrostimulation of the heart

A cardiological apparatus having a sensor (1) for detecting electrical signals from the heart and signal processing means which are connected to the sensor (1) and which are adapted to process signals received from the sensor (1) and include pre-processing means (2, 3, 4), characterized in that the signal processing means include:

• a reference time generator (8) which is adapted to output a time signal upon the occurrence of a periodically recurring signal feature,
• averaging means (11, 12, 21, 22, 6) which are adapted to form an averaged signal portion which is averaged over a plurality of signal portions between each two time signals, and are connected to the pre-processing means (2, 3, 4) and the reference time generator (8),
• an average store (7) which is adapted to store average values and which is connected to the averaging means,
• parameter determining means (9) which are connected to the pre-processing means (2, 3, 4) and the average store and which are adapted to ascertain a parameter characterizing a signal portion, and
• scatter value determining means (31) which are adapted to output a scatter value for time-successive signals and which are connected to the pre-processing means (2, 3, 4).