Methods and devices for accurately classifying cardiac activity
First Claim
1. An implantable cardiac stimulus device (ICSD) comprising a canister housing operational circuitry and a lead electrode assembly including a plurality of electrodes disposed thereon, with the lead electrode assembly configured to couple to the canister to electrically couple the operational circuitry to the electrodes on the lead electrode assembly, the operational circuitry being configured to perform a method of cardiac signal analysis comprising:
- the operational circuitry detecting a series of events;
the operational circuitry 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;
the operational circuitry estimating a cardiac rate using only certified intervals; and
the operational circuitry using the estimated cardiac rate to make therapy decisions.
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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.
266 Citations
18 Claims
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1. An implantable cardiac stimulus device (ICSD) comprising a canister housing operational circuitry and a lead electrode assembly including a plurality of electrodes disposed thereon, with the lead electrode assembly configured to couple to the canister to electrically couple the operational circuitry to the electrodes on the lead electrode assembly, the operational circuitry being configured to perform a method of cardiac signal analysis comprising:
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the operational circuitry detecting a series of events; the operational circuitry 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; the operational circuitry estimating a cardiac rate using only certified intervals; and the operational circuitry using the estimated cardiac rate to make therapy decisions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable device comprising a canister housing operational circuitry configured for use in an implantable cardiac stimulus system, the canister being configured to couple to a lead electrode assembly including a plurality of electrodes disposed thereon to electrically couple the operational circuitry to the electrodes on the lead electrode assembly, the operational circuitry being configured to perform a method of cardiac signal analysis comprising:
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the operational circuitry detecting a series of events using a signal received from at least one electrode of the lead electrode assembly when electrically coupled thereto; the operational circuitry 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; the operational circuitry estimating a cardiac rate using only certified intervals; and the operational circuitry using the estimated cardiac rate to make therapy decisions. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of cardiac signal analysis in an implantable cardiac stimulus device (ICSD), the ICSD comprising a canister housing operational circuitry and a lead electrode assembly including a plurality of electrodes disposed thereon, with the lead electrode assembly configured to couple to the canister to electrically couple the operational circuitry to the electrodes on the lead electrode assembly, the method of cardiac signal analysis comprising:
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the operational circuitry detecting a series of events; the operational circuitry 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; the operational circuitry estimating a cardiac rate using only certified intervals; and the operational circuitry using the estimated cardiac rate to make therapy decisions. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification