| 摘要 |
In a method for classifying IEGM waveforms in dependence of the workload of a patient, a predetermined number of IEGM-signals, each signal extending over at least one segment of one heart beat cycle, are registered, whereafter the IEGM-signals are fed to a neural network and an encoded form of the signals is formed using said neural network. This encoded form is stored in a memory, for use in classifying further registered IEGM-signals. In an active cardiac implant connectable to an implantable electrode arrangement adapted for in vivo delivery of stimulation pulses to a heart, IEGM signals present are obtained from one or more of the electrodes. A pulse generator connected to the electrode arrangement, generates and emits stimulation pulses with a variable stimulation interval between successive stimulation pulses. The implant also contains a classifying device for classification of a predetermined number of IEGM-signals registered during predetermined time intervals at predetermined points of time according to a predetermined classification stored in the classification device, this classification being related to preregistered waveforms of measured IEGM-signals. A control unit in the implant supplies a control signal to a control input of the pulse generator dependent on the classification of each of the registered IEGM signals. The control signal causes the pulse generator to adjust the stimulation rate dependent on each of the registered IEGM-signals.
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