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 analyzing a detection interval between consecutive detected events and the operational circuitry comparing the detection interval to a wide-complex (WC) detection interval threshold;
if the detection interval is less than the WC detection interval threshold, the operational circuitry determines whether at least one of the following is also true;
a) the consecutive detected events differ in polarity, where polarity is determined by observing whether a maximum or a minimum amplitude occurs first in time in the shape of each of the consecutive detected events;
orb) an interval between the latter of the minimum or maximum amplitude point for the first-in-time of the consecutive detected events and the first of the minimum or maximum amplitude point for the second-in-time of the consecutive detected events is less than an event peak threshold; and
if the operational circuitry determines that either a) or b) is true, the operational circuitry determines that one of the consecutive detected events is due to overdetection.
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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.
288 Citations
8 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 analyzing a detection interval between consecutive detected events and the operational circuitry comparing the detection interval to a wide-complex (WC) detection interval threshold; if the detection interval is less than the WC detection interval threshold, the operational circuitry determines whether at least one of the following is also true; a) the consecutive detected events differ in polarity, where polarity is determined by observing whether a maximum or a minimum amplitude occurs first in time in the shape of each of the consecutive detected events;
orb) an interval between the latter of the minimum or maximum amplitude point for the first-in-time of the consecutive detected events and the first of the minimum or maximum amplitude point for the second-in-time of the consecutive detected events is less than an event peak threshold; and if the operational circuitry determines that either a) or b) is true, the operational circuitry determines that one of the consecutive detected events is due to overdetection. - View Dependent Claims (2, 3, 4)
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5. A method of cardiac signal analysis in 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 method of cardiac signal analysis comprising:
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the operational circuitry detecting a series of events; the operational circuitry analyzing a detection interval between a pair of consecutive detected events from the series of events and the operational circuitry comparing the detection interval to a wide-complex (WC) detection interval threshold; the operational circuitry finding that the detection interval is less than the WC detection interval threshold and then the operational circuitry determining whether at least one of the following is also true; a) the consecutive detected events differ in polarity, where polarity is determined by observing whether a maximum or a minimum amplitude occurs first in time in the shape of each of the consecutive detected events;
orb) an interval between the latter of the minimum or maximum amplitude point for the first-in-time of the consecutive detected events and the first of the minimum or maximum amplitude point for the second-in-time of the consecutive detected events is less than an event peak threshold; and the operational circuitry finding at least one of a) or b) is true and as a result of at least one of a) or b) being true, the operational circuitry determining that one of the consecutive detected events is due to overdetection. - View Dependent Claims (6, 7, 8)
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Specification