| 摘要 |
A heart stimulator for stimulating a chamber of a heart by way of electrical stimulation pulses, said pacemaker comprises a sensing stage connected or being connectable to an electrode lead comprising an electrode for picking up electric potentials inside a heart chamber, said sensing stage being adapted to sense an excitation of a heart chamber by way of picked up electric potentials, a stimulation pulse generator adapted to generate electric stimulation pulses and being connected or being connectable to an electrode lead comprising a stimulation electrode for delivering electric stimulation pulses to said chamber of a heart, and a control unit being connected to said sensing stage and to said stimulation pulse generator and being adapted to trigger stimulation pulses to be generated by the stimulation pulse generator and to be delivered via said electrode lead, said stimulation pulses being triggered with a controlled stimulation rate controlled by the control unit. For preventing too high a stimulation rate for too long a period of time a monitoring stage is provided that connected to the control unit and being adapted to monitor said controlled stimulation rate and override the controlled stimulation rate by a fixed stimulation rate for a predetermined period of time if the average controlled stimulation rate exceeds a predetermined maximum rate.
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