Cardiac monitoring
DC CAFCFirst Claim
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1. A device, comprising:
- a beat detector to identify a beat-to-beat timing of cardiac activity;
a ventricular beat detector to identify ventricular beats in the cardiac activity;
variability determination logic to determine a variability in the beat-to-beat timing of a collection of beats;
relevance determination logic to identify a relevance of the variability in the beat-to-beat timing to at least one of atrial fibrillation and atrial flutter; and
an event generator to generate an event when the variability in the beat-to-beat timing is identified as relevant to the at least one of atrial fibrillation and atrial flutter in light of the variability in the beat-to-beat timing caused by ventricular beats identified by the ventricular beat detector.
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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.
157 Citations
25 Claims
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1. A device, comprising:
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a beat detector to identify a beat-to-beat timing of cardiac activity; a ventricular beat detector to identify ventricular beats in the cardiac activity; variability determination logic to determine a variability in the beat-to-beat timing of a collection of beats; relevance determination logic to identify a relevance of the variability in the beat-to-beat timing to at least one of atrial fibrillation and atrial flutter; and an event generator to generate an event when the variability in the beat-to-beat timing is identified as relevant to the at least one of atrial fibrillation and atrial flutter in light of the variability in the beat-to-beat timing caused by ventricular beats identified by the ventricular beat detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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receiving information describing a timing of heart beats of an individual; determining a first time between a first heart beat and a second heart beat of the individual, wherein the second heart beat follows immediately after the first heart beat; determining a second time between the second heart beat and a third heart beat of the individual, wherein the third heart beat follows immediately after the second heart beat; determining a factor reflecting the difference between the first time and the second time, wherein the factor is lowest when the first time is close to the second time, and the factor increases non-linearly when the absolute difference between the first time the second time grows; and identifying at least one of an atrial fibrillation event and an atrial flutter event of the individual based on the factor. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An article comprising one or more machine-readable media storing instructions operable to cause one or more machines to perform operations, the operations comprising:
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determining a beat-to-beat variability in cardiac electrical activity; determining a relevance of the variability over a collection of beats to one of atrial fibrillation and atrial flutter using a non-linear function of a beat-to-beat interval; 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 the one of atrial fibrillation and atrial flutter. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification