METHODS AND DEVICES FOR ACCURATELY CLASSIFYING CARDIAC ACTIVITY
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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 some 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. Several examples emphasize the use of morphology analysis using correlation to static templates and/or inter-event correlation analysis.
7 Citations
13 Claims
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1. (canceled)
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2. An implantable cardiac stimulus device (ICSD) comprising a canister housing operational circuitry configured for coupling to a lead electrode assembly which has a plurality of electrodes disposed thereon such that the operational circuitry can be electrically coupled 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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detecting a series of events; measuring widths of the detected events; comparing a detected event, N, to a plurality of preceding detected events to yield a set of correlations; identifying a pattern of high-low correlation among the set of correlations; assessing the width of the detected events in connection with the step of identifying a pattern of high-low correlation; and if a high low pattern is found along with a width sequence suggesting double detection, identifying at least one of the series of detected events as an overdetection. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A method of operation in an implantable cardiac stimulus device (ICSD) comprising a canister having at least one electrode thereon and housing operational circuitry configured for coupling to a lead electrode assembly which has a plurality of electrodes disposed thereon such that the operational circuitry can be electrically coupled to the electrodes on the lead electrode assembly, the operational circuitry being configured to perform a cardiac signal analysis, the method comprising:
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the operational circuitry detecting a series of events in a signal captured using one or more of the electrodes on the lead and/or housing; the operational circuitry measuring widths of the detected events; the operational circuitry comparing a detected event, N, to a plurality of preceding detected events to yield a set of correlations; the operational circuitry identifying a pattern of high-low correlation among the set of correlations; the operational circuitry assessing the widths of the detected events in connection with the step of identifying a pattern of high-low correlation; and if a high low pattern is found along with a width sequence suggesting double detection, the operational circuitry identifying at least one of the series of detected events as an overdetection. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification