| 摘要 |
A degree of randomness associated with the heart rate of the patient is determined based on an analysis of electrical heart signals. The degree of randomness may be determined, for example, based on a degree of entropy or a chaos dimensionality associated with heart rate. If the degree of randomness falls below a threshold value, indicating that the heart rate may be too coherent, a warning signal is generated indicating a significant risk of onset of a tachyarrhythmia. To prevent the tachyarrhythmia from occurring, overdrive pacing is initiated or, if already initiated, the overdrive pacing is made more aggressive. In a related technique, chaotic pacing is performed to ensure a sufficient heart rate variability.
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