Cardiac rhythm management system with prevention of double counting of events
First Claim
1. A method including:
- (a) detecting cardiac events using a first sensing circuit for sensing heart signals from first and second heart chambers, wherein the first and second heart chambers are both atria, or wherein the first and second heart chambers are both ventricles;
(b) obtaining intervals between cardiac events associated with the first and second heart chambers;
(c) pairing successive intervals into first-second interval pairs;
(d) classifying the intervals, according to their duration, into at least first and second categories;
(e) recognizing patterns in the first and second intervals based on their classification, the recognizing patterns comprising counting, among a first predetermined number of most recent first-second interval pairs, a second predetermined number of one or more first-second interval pairs in which the first interval is in the first category and the second interval is in the second category; and
(f) determining timing of delivery of output energy based on (e).
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Abstract
A cardiac rhythm management system recognizes patterns of interval durations, distinguishing between events in different heart chambers even though signals associated with those different heart chambers are processed using a commonly shared sensing circuit. A therapy delivery algorithm ignores intervals between cardiac events occurring in different heart chambers when determining a cardiac rate upon which the delivery of therapy is based. This reduces the risk of inappropriate delivery of therapy to the patient. Delayed conduction left ventricular beats are not erroneously recognized as a subsequent right ventricular beat, preventing such short intervals from inappropriately triggering a defibrillation countershock.
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Citations
20 Claims
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1. A method including:
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(a) detecting cardiac events using a first sensing circuit for sensing heart signals from first and second heart chambers, wherein the first and second heart chambers are both atria, or wherein the first and second heart chambers are both ventricles; (b) obtaining intervals between cardiac events associated with the first and second heart chambers; (c) pairing successive intervals into first-second interval pairs; (d) classifying the intervals, according to their duration, into at least first and second categories; (e) recognizing patterns in the first and second intervals based on their classification, the recognizing patterns comprising counting, among a first predetermined number of most recent first-second interval pairs, a second predetermined number of one or more first-second interval pairs in which the first interval is in the first category and the second interval is in the second category; and (f) determining timing of delivery of output energy based on (e). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system, including:
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a first sensing circuit, for sensing heart signals from respective first and second heart chambers, wherein the first and second heart chambers are both atria, or wherein the first and second heart chambers are both ventricles; a therapy circuit, for delivering therapy to the respective first and second heart chambers; and a controller, controlling delivery of therapy by the therapy circuit based at least in part on signals received by the first sensing circuit, the controller including; a classification module, classifying previous and current intervals between cardiac events of the first and second heart chambers according to their duration; a pattern recognition module, recognizing patterns in the current and previous intervals based on their classification; and a therapy delivery control module, controlling timing of delivery of therapy based on the intervals between cardiac events. - View Dependent Claims (8, 9, 10, 11, 12, 19, 20)
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13. A system, including:
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a first sensing circuit, for sensing heart signals from respective first and second heart chambers, wherein the first and second heart chambers are both atria, or wherein the first and second heart chambers are both ventricles; a therapy circuit, for delivering therapy to the respective first and second heart chambers; and a controller, controlling delivery of therapy by the therapy circuit based at least in part on signals received by the first sensing circuit, the controller including; means for classifying previous and current intervals between cardiac events of the first and second heart chambers according to their duration; means for recognizing patterns in the current and previous intervals based on their classification; and a therapy delivery control module, controlling timing of delivery of therapy based on the intervals between cardiac events. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification