Methods and devices for accurately classifying cardiac activity
First Claim
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1. An implantable cardiac stimulus device (ICSD) comprising the following:
- a canister housing operational circuitry; and
a lead electrode assembly including a plurality of electrodes disposed thereon;
wherein with the lead electrode assembly is 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 comparing the detected events to a morphology template to establish a series of correlation scores indicative of the extent of correlation between the shape of detected events and the morphology template;
the operational circuitry analyzing the series of correlation scores to observe a high-low-high pattern of;
a first-most recent event having a high correlation score;
a second-most recent event having a low correlation score; and
a third-most recent event having a high correlation score;
when the high-low-high pattern is identified, the operational circuitry determining that the second-most recent event is an overdetection;
upon finding an overdetection, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection into a combined interval;
the operational circuitry using the combined interval in estimating cardiac rate; and
the operational circuitry using the estimated cardiac rate to make a therapy decision.
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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.
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Citations
7 Claims
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1. An implantable cardiac stimulus device (ICSD) comprising the following:
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a canister housing operational circuitry; and a lead electrode assembly including a plurality of electrodes disposed thereon; wherein with the lead electrode assembly is 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 comparing the detected events to a morphology template to establish a series of correlation scores indicative of the extent of correlation between the shape of detected events and the morphology template; the operational circuitry analyzing the series of correlation scores to observe a high-low-high pattern of; a first-most recent event having a high correlation score; a second-most recent event having a low correlation score; and a third-most recent event having a high correlation score; when the high-low-high pattern is identified, the operational circuitry determining that the second-most recent event is an overdetection; upon finding an overdetection, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection into a combined interval; the operational circuitry using the combined interval in estimating cardiac rate; and the operational circuitry using the estimated cardiac rate to make a therapy decision. - View Dependent Claims (2)
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3. An implantable cardiac stimulus device (ICSD) comprising a canister housing operational circuitry configured for coupling to and use with a lead including a plurality of electrodes disposed thereon, with the lead configured to couple to the canister to electrically couple the operational circuitry to the electrodes on the lead, 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 comparing the detected events to a morphology template to establish a series of correlation scores indicative of the extent of correlation between the shape of detected events and the morphology template; the operational circuitry analyzing the series of correlation scores to observe a high-low-high pattern of; a first-most recent event having a high correlation score; a second-most recent event having a low correlation score; and a third-most recent event having a high correlation score; when the high-low-high pattern is identified, the operational circuitry determining that the second-most recent event is an overdetection; upon finding an overdetection, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection into a combined interval; the operational circuitry using the combined interval in estimating cardiac rate; and the operational circuitry using the estimated cardiac rate to make a therapy decision. - View Dependent Claims (4)
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5. A method of operation in an implantable cardiac stimulus device (ICSD), the ICSD comprising a canister housing operational circuitry configured for coupling to and use with a lead including a plurality of electrodes disposed thereon, with the lead configured to couple to the canister to electrically couple the operational circuitry to the electrodes on the lead, the a method comprising analyzing a cardiac signal by:
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detecting a series of events; comparing the detected events to a morphology template to establish a series of correlation scores indicative of the extent of correlation between the shape of detected events and the morphology template; analyzing the series of correlation scores to observe a high-low-high pattern of; a first-most recent event having a high correlation score; a second-most recent event having a low correlation score; and a third-most recent event having a high correlation score; when the high-low-high pattern is identified, determining that the second-most recent event is an overdetection; upon finding an overdetection, combining an interval preceding the overdetection and an interval following the overdetection into a combined interval; estimating cardiac rate using the combined interval; and using the estimated cardiac rate to make a therapy decision. - View Dependent Claims (6, 7)
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Specification