METHODS AND DEVICES IMPLEMENTING DUAL CRITERIA FOR ARRHYTHMIA DETECTION
First Claim
1. An implantable cardiac stimulus device comprising electrodes coupled to operational circuitry for sensing cardiac activity and detecting events in the sensed cardiac activity and delivering therapy in response to identified conditions, in which the operational circuitry is configured to use one or more arrhythmia identification parameters which can be modified within predefined ranges, wherein the operational circuitry is configured to:
- establish a preliminary identification of a potentially treatable arrhythmia using a set of detected events;
determine whether the set of detected events are varying in shape or consistent in shape using a predefined parameter;
if the set of detected events is varying in shape, apply a first value for the arrhythmia detection parameter to assess whether the preliminary identification of a potentially treatable arrhythmia should be declared as an episode of treatable arrhythmia; and
if the set of detected events is not varying in shape, apply a second value for the arrhythmia detection parameter to assess whether the preliminary identification of a potentially treatable arrhythmia should be declared as an episode of treatable arrhythmia;
wherein the second value is different from the first value.
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Abstract
Methods and devices providing multiple criteria for use in arrhythmia identification. Based on inputs including defined rules or parameters, one of a more conservative or more aggressive set of arrhythmia identification parameters can be selected. One or the other of the selectable sets of arrhythmia identification parameters may also be adaptive or modifiable during the use of the system, for example, in response to identified nonsustained episodes, the more conservative set of arrhythmia identification parameters can be modified to become still more conservative. Such modification of arrhythmia identification criteria allows reduced time to therapy when indicated, while allowing more deliberate decisions in other circumstances.
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Citations
20 Claims
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1. An implantable cardiac stimulus device comprising electrodes coupled to operational circuitry for sensing cardiac activity and detecting events in the sensed cardiac activity and delivering therapy in response to identified conditions, in which the operational circuitry is configured to use one or more arrhythmia identification parameters which can be modified within predefined ranges, wherein the operational circuitry is configured to:
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establish a preliminary identification of a potentially treatable arrhythmia using a set of detected events; determine whether the set of detected events are varying in shape or consistent in shape using a predefined parameter; if the set of detected events is varying in shape, apply a first value for the arrhythmia detection parameter to assess whether the preliminary identification of a potentially treatable arrhythmia should be declared as an episode of treatable arrhythmia; and if the set of detected events is not varying in shape, apply a second value for the arrhythmia detection parameter to assess whether the preliminary identification of a potentially treatable arrhythmia should be declared as an episode of treatable arrhythmia; wherein the second value is different from the first value. - View Dependent Claims (2)
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3. An implantable cardiac stimulus device comprising electrodes coupled to operational circuitry for sensing cardiac activity and detecting events in the cardiac activity, the operational circuitry further being configured to deliver therapy in response to identified conditions, wherein the operational circuitry is configured to:
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observe features of the cardiac signal for a set of detected events and use the observed features to select from at least; a) a first set of arrhythmia declaration parameters; and b) a second set of arrhythmia declaration parameters; and use the selected set of arrhythmia detection parameters to analyze the sensed cardiac activity; wherein the first set of arrhythmia declaration parameters is different from the second set of arrhythmia declaration parameters such that, for at least set of detected data, analysis using the first set of arrhythmia declaration parameters would not declare a treatable arrhythmia while analysis using the second set of arrhythmia declaration parameters would declare at treatable arrhythmia. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of cardiac signal analysis in an implantable cardiac device, the implantable cardiac device comprising electrodes coupled to operational circuitry for sensing cardiac activity and performing cardiac signal analysis, the method comprising:
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observing features of the cardiac signal for a set of detected events and using the observed features to select from; a) a first set of arrhythmia declaration parameters; and b) a second set of arrhythmia declaration parameters; and using the selected set of arrhythmia declaration parameters to analyze the sensed cardiac activity; wherein the first set of arrhythmia declaration parameters is different from the second set of arrhythmia declaration parameters such that, for at least set of detected data, analysis using the first set of arrhythmia declaration parameters would not declare a treatable arrhythmia while analysis using the second set of arrhythmia declaration parameters would declare at treatable arrhythmia.
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Specification