Methods and devices for accurately classifying cardiac activity
First Claim
1. A method of cardiac signal analysis in an implantable medical device (IMD), the IMD including a number of implantable electrodes and operational circuitry coupled to the implantable electrodes for performing the method of cardiac signal analysis, the method comprising:
- a) the operational circuitry detecting events in a signal;
b) the operational circuitry determining which detected events to certify for use in rhythm identification by;
i) applying interval analysis on a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified;
ii) applying analysis to identify overdetected events using interval and shape characteristics of pairs of consecutive events such that, if a likely overdetection is identified, the likely overdetection is not certified; and
iii) certifying at least some detected events of the set of detected events; and
c) the operational circuitry determining whether a malignant cardiac rhythm is occurring using only the certified detected events.
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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
18 Claims
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1. A method of cardiac signal analysis in an implantable medical device (IMD), the IMD including a number of implantable electrodes and operational circuitry coupled to the implantable electrodes for performing the method of cardiac signal analysis, the method comprising:
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a) the operational circuitry detecting events in a signal; b) the operational circuitry determining which detected events to certify for use in rhythm identification by; i) applying interval analysis on a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified; ii) applying analysis to identify overdetected events using interval and shape characteristics of pairs of consecutive events such that, if a likely overdetection is identified, the likely overdetection is not certified; and iii) certifying at least some detected events of the set of detected events; and c) the operational circuitry determining whether a malignant cardiac rhythm is occurring using only the certified detected events. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable cardiac stimulus device (ICSD) comprising electrodes for capturing data from a recipient of the ICSD and operational circuitry coupled to the electrodes to analyze signal captured from the patient, wherein the operational circuitry is configured to perform a method comprising the following steps:
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a) detecting events in a signal; b) determining which detected events to certify for use in rhythm identification by; i) applying interval analysis on a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified; and ii) applying analysis to identify overdetected events using interval and shape characteristics of pairs of consecutive events such that, if a likely overdetection is identified, the likely overdetection is not certified; and iii) certifying at least some detected events of the set of detected events; and c) determining whether a malignant cardiac rhythm is occurring using only the certified detected events; and d) delivering therapy in response to the malignant rhythm. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An implantable cardiac stimulus device (ICSD) comprising a canister housing operational circuitry, the canister configured for coupling to a lead having one or more electrodes thereon, the operational circuitry configured to receive a signal from a plurality of electrodes when a lead is coupled to the canister, wherein the operational circuitry is configured to perform the following:
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a) detecting events in a signal; b) determining which events to certify for use in rhythm identification by; i) applying interval analysis on a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified; ii) applying analysis to identify overdetected events using interval and shape characteristics of pairs of consecutive events such that, if a likely overdetection is identified, the likely overdetection is not certified; iii) certifying at least some detected events of the set of detected events; and c) determining whether a malignant cardiac rhythm is occurring using only the certified detected events. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification