Methods and devices for accurately classifying cardiac activity
First Claim
1. An implantable cardiac monitoring device comprising operational circuitry and a plurality of electrodes electrically coupled to the operational circuitry, the operational circuitry being configured to perform a method of cardiac signal analysis comprising:
- the operational circuitry receiving an electrical signal from the electrodes and detecting a series of events in the electrical signal and identifying intervals between consecutive detected events;
the operational circuitry using morphology analysis to identify overdetections of electrical signals emanating from the heart of a patient in the series of events;
whenever an overdetection is identified, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection to form a combined interval;
following the morphology analysis to identify overdetections, the operational circuitry certifying combined intervals and intervals that are not adjacent to overdetections; and
the operational circuitry estimating a cardiac rate using only the certified intervals;
wherein the operational circuitry comprises a memory for storing cardiac data and the operational circuitry is configured to use the estimated cardiac rate to determine whether to store data in the memory.
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Abstract
Methods, systems, and devices for signal analysis in an implanted cardiac monitoring and treatment device such as an implantable cardioverter defibrillator. In illustrative examples, captured data including detected events is analyzed to identify likely overdetection of cardiac events. In some illustrative examples, when overdetection is identified, data may be modified to correct for overdetection, to reduce the impact of overdetection, or to ignore overdetected data. New methods for organizing the use of morphology and rate analysis in an overall architecture for rhythm classification and cardiac signal analysis are also discussed.
270 Citations
20 Claims
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1. An implantable cardiac monitoring device comprising operational circuitry and a plurality of electrodes electrically coupled to the operational circuitry, the operational circuitry being configured to perform a method of cardiac signal analysis comprising:
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the operational circuitry receiving an electrical signal from the electrodes and detecting a series of events in the electrical signal and identifying intervals between consecutive detected events; the operational circuitry using morphology analysis to identify overdetections of electrical signals emanating from the heart of a patient in the series of events; whenever an overdetection is identified, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection to form a combined interval; following the morphology analysis to identify overdetections, the operational circuitry certifying combined intervals and intervals that are not adjacent to overdetections; and the operational circuitry estimating a cardiac rate using only the certified intervals; wherein the operational circuitry comprises a memory for storing cardiac data and the operational circuitry is configured to use the estimated cardiac rate to determine whether to store data in the memory. - View Dependent Claims (2, 3, 4, 5)
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6. A cardiac stimulus device comprising operational circuitry and a plurality of electrodes electrically coupled to the operational circuitry, the operational circuitry being configured to perform a method of cardiac signal analysis comprising:
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the operational circuitry receiving an electrical signal from the electrodes and detecting a series of events in the electrical signal and identifying intervals between consecutive detected events; the operational circuitry using morphology analysis to identify overdetections of electrical signals emanating from the heart of a patient in the series of events; whenever an overdetection is identified, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection to form a combined interval; following the morphology analysis to identify overdetections, the operational circuitry certifying combined intervals and intervals that are not adjacent to overdetections; and the operational circuitry estimating a cardiac rate using only the certified intervals; wherein the operational circuitry further comprises stimulus circuitry for generating a therapeutic stimulus to a patient, further wherein the operational circuitry is configured to use the estimated cardiac rate to determine whether cardiac stimulus is needed and, if so, to deliver the cardiac stimulus to the patient. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of cardiac signal analysis in medical device comprising operational circuitry and a plurality of electrodes electrically coupled to the operational circuitry, the method of cardiac signal analysis comprising:
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the operational circuitry detecting a series of events in a signal sensed using the electrodes and identifying intervals between consecutive detected events; the operational circuitry using morphology analysis to identify overdetections from the series of events; whenever an overdetection is identified, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection to form a combined interval; following the morphology analysis to identify overdetections, the operational circuitry certifying combined intervals and intervals that are not adjacent to overdetections; and the operational circuitry estimating a cardiac rate using only certified intervals; wherein the medical device further comprises stimulus circuitry for generating a therapeutic stimulus to a patient, and, when cardiac stimulus is needed, using the stimulus circuitry to deliver the cardiac stimulus to the patient. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of cardiac signal analysis in medical device comprising operational circuitry and a plurality of electrodes electrically coupled to the operational circuitry, the method of cardiac signal analysis comprising:
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the operational circuitry detecting a series of events in a signal sensed using the electrodes and identifying intervals between consecutive detected events; the operational circuitry using morphology analysis to identify overdetections from the series of events; whenever an overdetection is identified, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection to form a combined interval; following the morphology analysis to identify overdetections, the operational circuitry certifying combined intervals and intervals that are not adjacent to overdetections; and the operational circuitry estimating a cardiac rate using only certified intervals; wherein the medical device is an implantable cardiac monitoring device that comprises a memory for storing cardiac data, wherein the method further comprises using the estimated cardiac rate to determine whether to store data in the memory and, if so, storing data in the memory. - View Dependent Claims (20)
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Specification