Method and apparatus for determining oversensing in a medical device
First Claim
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1. A medical device comprising:
- a housing containing electronic circuitry; and
a plurality of electrodes coupled to the electronic circuitry that sense at least one cardiac signal,wherein the electronic circuitry comprises a processor that;
analyzes the at least one cardiac signal on a beat-to-beat basis,determines a first characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal on the beat-to-beat basis,identifies a cardiac event based on the first characteristic of the at least one cardiac signal,in response to identifying the cardiac event, analyzes the at least one cardiac signal within at least one predetermined sensing window, the at least one predetermined sensing window comprising a predetermined duration of time unrelated to one or more beat-to-beat durations,determines a second characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal within the at least one predetermined sensing window, andidentifies oversensing based on the second characteristic, wherein the processor transitions the medical device between a first state and a second state when the processor identifies the cardiac event.
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Abstract
A method and apparatus for determining oversensing of cardiac signals that includes a housing containing electronic circuitry, an electrode coupled to the electronic circuitry to sense cardiac signals, and a processor, positioned within the housing, to determine an oversensing characteristic associated with the cardiac signals sensed over a predetermined sensing window, and to identify oversensing in response to the determined oversensing characteristic.
90 Citations
19 Claims
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1. A medical device comprising:
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a housing containing electronic circuitry; and a plurality of electrodes coupled to the electronic circuitry that sense at least one cardiac signal, wherein the electronic circuitry comprises a processor that; analyzes the at least one cardiac signal on a beat-to-beat basis, determines a first characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal on the beat-to-beat basis, identifies a cardiac event based on the first characteristic of the at least one cardiac signal, in response to identifying the cardiac event, analyzes the at least one cardiac signal within at least one predetermined sensing window, the at least one predetermined sensing window comprising a predetermined duration of time unrelated to one or more beat-to-beat durations, determines a second characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal within the at least one predetermined sensing window, and identifies oversensing based on the second characteristic, wherein the processor transitions the medical device between a first state and a second state when the processor identifies the cardiac event. - View Dependent Claims (2)
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3. A medical device comprising:
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a housing containing electronic circuitry; and a plurality of electrodes coupled to the electronic circuitry that sense at least one cardiac signal, wherein the electronic circuitry comprises a processor that; analyzes the at least one cardiac signal on a beat-to-beat basis, determines a first characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal on the beat-to-beat basis, identifies a cardiac event based on the first characteristic of the at least one cardiac signal, in response to identifying the cardiac event, analyzes the at least one cardiac signal within at least one predetermined sensing window, the at least one predetermined sensing window comprising a predetermined duration of time unrelated to one or more beat-to-beat durations, determines a second characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal within the at least one predetermined sensing window, and identifies oversensing based on the second characteristic, wherein the first characteristic comprises at least one heart rate metric and the second characteristic comprises at least one of a spectral width, a metric of signal energy content, or a heart rate metric difference.
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4. A method comprising:
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sensing, by a medical device, at least one cardiac signal; analyzing, by the medical device, the at least one cardiac signal on a beat-to-beat basis; determining, by the medical device, a first characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal on the beat-to-beat basis; identifying, by the medical device, a cardiac event based on the first characteristic of the at least one cardiac signal; in response to identifying the cardiac event, analyzing, by the medical device, the at least one cardiac signal within at least one predetermined sensing window, the at least one predetermined sensing window comprising a predetermined duration of time unrelated to one or more beat-to-beat durations; determining, by the medical device, a second characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal within the at least one predetermined sensing window; identifying, by the medical device, oversensing based on the second characteristic; and transitioning, by the medical device, between a first state and a second state based on identifying the cardiac event. - View Dependent Claims (5)
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6. A method comprising:
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sensing, by a medical device, at least one cardiac signal; analyzing, by the medical device, the at least one cardiac signal on a beat-to-beat basis; determining, by the medical device, a first characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal on the beat-to-beat basis; identifying, by the medical device, a cardiac event based on the first characteristic of the at least one cardiac signal; in response to identifying the cardiac event, analyzing, by the medical device, the at least one cardiac signal within at least one predetermined sensing window, the at least one predetermined sensing window comprising a predetermined duration of time unrelated to one or more beat-to-beat durations; determining, by the medical device, a second characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal within the at least one predetermined sensing window; and identifying, by the medical device, oversensing based on the second characteristic, wherein the first characteristic comprises at least one heart rate metric and the second characteristic comprises at least one of a spectral width, a metric of signal energy content, or a heart rate metric difference.
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7. A method comprising:
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sensing, by a medical device, a first group of cardiac signals along a first sensing vector; sensing, by the medical device, a second group of cardiac signals along a second sensing vector; analyzing, by the medical device, the first and second groups of cardiac signals on a beat-to-beat basis; determining, by the medical device, whether the first group of cardiac signals is reliable; determining, by the medical device, whether the second group of cardiac signals is reliable; determining, by the medical device, a first characteristic of each of the one or more of the first and second groups of cardiac signals determined to be reliable based on analyzing the cardiac signals on the beat-to-beat basis; identifying, by the medical device, a cardiac event based on the one or more first characteristics; in response to identifying the cardiac event, analyzing, by the medical device, at least one of the first or second groups of cardiac signals within at least one predetermined sensing window, the at least one predetermined sensing window comprising a predetermined duration of time unrelated to one or more beat-to-beat durations; determining, by the medical device, a second characteristic of at least one of the first or second groups of cardiac signals based on analyzing the cardiac signals on the schedule based on the at least one predetermined sensing window; and identifying, by the medical device, oversensing based on the second characteristic. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A medical device comprising:
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a housing containing electronic circuitry; and a plurality of electrodes coupled to the electronic circuitry that sense at least one cardiac signal, wherein the electronic circuitry comprises a processor that; analyzes the at least one cardiac signal on a beat-to-beat basis, determines a first characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal on the beat-to-beat basis, identifies a cardiac event based on the first characteristic of the at least one cardiac signal, in response to identifying the cardiac event, analyzes the at least one cardiac signal within at least one predetermined sensing window, the at least one predetermined sensing window comprising a predetermined duration of time unrelated to one or more beat-to-beat durations, determines a second characteristic of the at least one cardiac signal based on analyzing the at least one cardiac signal within the at least one predetermined sensing window, and identifies oversensing based on the second characteristic, wherein the first characteristic comprises a heart rate characteristic and, in response to identifying oversensing based on the second characteristic, the processor determines a corrected first characteristic based on the at least one cardiac signal used to determine the first characteristic, and determines whether the cardiac event is identified based on the corrected first characteristic.
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Specification