Cardiac monitoring
First Claim
Patent Images
1. A method comprising:
- determining a beat-to-beat variability in cardiac electrical activity;
determining an average relevance of the variability over a collection of beats to one of atrial fibrillation and atrial flutter using a non-linear statistics; and
identifying one of an atrial fibrillation event and an atrial flutter event based on the determined relevance, the event being a period in time when the information content of the cardiac electrical activity is of increased relevance to one of atrial fibrillation and atrial flutter.
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Abstract
Systems and techniques for monitoring cardiac activity. In one aspect, a method includes collecting information describing the variability in heart rate over a series of beats, designating variability at a lower end of physiological values as being largely irrelevant to atrial fibrillation, designating variability in a midrange of physiological values as being indicative of atrial fibrillation, designating variability in an upper range of physiological values as being negatively indicative of atrial fibrillation, and determining a relevance of the variability described in the collection to atrial fibrillation.
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Citations
31 Claims
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1. A method comprising:
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determining a beat-to-beat variability in cardiac electrical activity; determining an average relevance of the variability over a collection of beats to one of atrial fibrillation and atrial flutter using a non-linear statistics; and identifying one of an atrial fibrillation event and an atrial flutter event based on the determined relevance, the event being a period in time when the information content of the cardiac electrical activity is of increased relevance to one of atrial fibrillation and atrial flutter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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collecting information describing the variability in heart rate over a series of beats; designating variability at a lower end of physiological values as being substantially irrelevant to atrial fibrillation by weighting information that describes the lower end variability with a first weighting factor; designating variability in a midrange of physiological values as being positively indicative of atrial fibrillation by weighting information that describes the midrange variability with a second weighting factor; designating variability in an upper range of physiological values as being negatively indicative of atrial fibrillation by weighting information that describes the upper range variability with a third weighting factor; and determining a relevance of the weighted variability described in the collection of information to atrial fibrillation. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method comprising:
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comparing recent R to R intervals with preceding R to R intervals to yield a collection of comparisons; weighting the comparisons according to a likelihood that the comparisons are relevant to atrial fibrillation, the weighting including identifying a beat of a collection of recent beats as a ventricular beat, and assigning a preset value to weight the beat in the collection, the preset value being negatively indicative of atrial fibrillation; and determining the average relevance of the collection to atrial fibrillation. - View Dependent Claims (24, 25, 26, 27)
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28. A method comprising:
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collecting information describing the variability in heart rate over a series of beats, wherein the collected information is related to factor DRR(n) as given by designating variability at a lower end of physiological values as being substantially irrelevant to atrial fibrillation; designating variability in a midrange of physiological values as being positively indicative of atrial fibrillation; designating variability in an upper range of physiological values as being negatively indicative of atrial fibrillation; and determining a relevance of the variability described in the collection of information to atrial fibrillation. - View Dependent Claims (29, 30, 31)
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Specification