Cardiac pacemaker having means for effectiveness recognition

摘要

Cardiac pacemaker having means for effectiveness recognition, which comprise an input amplifier, which is connected with a stimulation electrode and is formed, within a predetermined time window after delivery of a stimulation pulse by means of the stimulation electrode a an activity of the heart in response to the stimulation pulse to receive a signal, and a differentiating element is designed in such a way that the activity of the heart signal indicating to receive and differentiating and a differentiated output signal to provide for the effectiveness recognition a measure of the heart activity, the beginning of the time window after the decay of an overshoot of the input amplifier is located on a point in time, to which the pitch and / or amplitude of the input signal without the presence of a signal indicating the activity of the heart is smaller than the threshold value for the signal indicating the activity of the heart.