System zum Einstellen des Schwellwertpegels eines Gebers bei einem frequenzadaptiven Herzschrittmacher

The cardiac pacemaker comprises a pace pulse generator for generating cardiac pace pulses, and rate control device for controlling the rate of generation of the pace pulses. The rate control device has a sensor responsive to a predetermined patient parameter for continuously providing a sensor output signal having a varying signal level, and processing device for processing the sensor output signal to provide a count signal for use in controlling the rate whenever the sensor output signal meets predetermined sensor output signal level criteria. An accumulating device accumulates data representative of the count signals over respective predetermined periods of time, and adjusting device adjusts the criteria as a function of the data. The patient parameter is patient activity, and the criteria is sensor output signal amplitude threshold. The analyzing device comprises histogram device for accumulating histogram data representative of activity counts per unit of time.