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...http://www.google.com/patents/US6766194?utm_source=gb-gplus-sharePatent US6766194 - Dynamic control of overdrive pacing based on degree of randomness within heart rate
