Cardiac response classification using retriggerable classification windows
First Claim
1. A method of classifying a cardiac response to a pacing stimulation, comprising:
- delivering the pacing stimulation to a heart chamber;
sensing a cardiac signal of the heart chamber following delivery of the pacing stimulation;
detecting a first trigger feature of the cardiac signal within a first predetermined capture detection region;
in response to detecting the first trigger feature of the cardiac signal within the first predetermined capture detection region, continuing to evaluate at least a portion of a QRS waveform of the cardiac signal that occurs after the first trigger feature;
classifying the cardiac response as fusion or capture of the heart chamber based on at least a portion of the QRS waveform of the cardiac signal that occurs after the first trigger feature; and
delivering pacing therapy based on the classification of the cardiac response as fusion or capture.
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Abstract
Methods and devices for classifying a cardiac response to pacing involve establishing a retriggerable cardiac response classification window. A first cardiac response classification window is established subsequent to delivery of a pacing pulse. A cardiac signal following the pacing stimulation is sensed in the first classification window. A second cardiac response classification may be triggered if a trigger characteristic is detected in the first classification window. The cardiac signal is sensed in the second classification window if the second classification window is established. The cardiac response to the pacing stimulation is determined based on characteristics of the cardiac signal. The cardiac response may be determined to be one of a captured response, a non-captured response, a non-captured response added to an intrinsic beat, and a fusion/pseudofusion beat, for example.
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Citations
23 Claims
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1. A method of classifying a cardiac response to a pacing stimulation, comprising:
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delivering the pacing stimulation to a heart chamber; sensing a cardiac signal of the heart chamber following delivery of the pacing stimulation; detecting a first trigger feature of the cardiac signal within a first predetermined capture detection region; in response to detecting the first trigger feature of the cardiac signal within the first predetermined capture detection region, continuing to evaluate at least a portion of a QRS waveform of the cardiac signal that occurs after the first trigger feature; classifying the cardiac response as fusion or capture of the heart chamber based on at least a portion of the QRS waveform of the cardiac signal that occurs after the first trigger feature; and delivering pacing therapy based on the classification of the cardiac response as fusion or capture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A cardiac device, comprising:
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a pacing pulse generator configured to generate cardiac pacing pulses; a sensing system configured to sense a cardiac pacing response signal of a heart chamber following delivery of a pacing pulse to the heart chamber; and a cardiac response classification system configured to detect a first trigger feature of the cardiac signal within a first classification window, and, in response to detecting the first trigger feature of the cardiac signal, to continue to evaluate at least a portion of a QRS waveform of the cardiac signal that occurs after the first trigger feature, the cardiac response classification system further configured to discriminate between fusion and capture of the heart chamber based on the portion of the QRS waveform of the cardiac signal that occurs after the first trigger feature. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A cardiac device, comprising:
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a pacing pulse generator configured to generate cardiac pacing pulses; a sensing system configured to sense a cardiac pacing response signal of a heart chamber following delivery of a pacing pulse to the heart chamber; and a cardiac response classification system configured to sense for a trigger feature of the cardiac signal within a first classification window, and, in response to detecting the trigger feature of the cardiac signal within the first classification window to continue to evaluate at least a portion of a QRS waveform of the cardiac signal that occurs after the first classification window in one or more additional classification windows, the cardiac response classification system further configured to discriminate between fusion and capture of the heart chamber based at least in part on the portion of the QRS waveform of the cardiac signal that occurs in the one or more additional classification windows. - View Dependent Claims (18, 19, 20)
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21. A method of operating a cardiac device, comprising:
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delivering the pacing stimulation to a heart chamber during a cardiac cycle; sensing a cardiac signal of the heart chamber during the cardiac cycle and following delivery of the pacing stimulation; determining if a trigger feature of the cardiac signal occurs within one or more detection regions, the detection regions having upper and lower timing boundaries and upper and lower amplitude boundaries; in response to determining that a cardiac signal trigger feature falls within one of the detection regions, continuing to evaluate at least a portion of a QRS waveform of the cardiac signal that occurs after the determined trigger feature; classifying the cardiac signal based on one or more of detection of the trigger feature within the one or more detection regions and at least a portion of the QRS waveform of the cardiac signal that occurs after the determined trigger feature; and delivering pacing therapy based on classification of the cardiac signal. - View Dependent Claims (22)
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23. A method of classifying a cardiac response to a pacing stimulation, comprising:
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delivering the pacing stimulation to a heart chamber; sensing a cardiac signal of the heart chamber following delivery of the pacing stimulation; searching for a first feature of a QRS waveform associated with the cardiac signal within a first capture detection region; if the first feature is detected within the first capture detection region, searching for a second feature of the QRS waveform within a second capture detection region; classifying the cardiac response as fusion or capture of the heart chamber based, at least in part, on whether the first feature of the QRS waveform was detected in the first capture detection region and/or whether the second feature of the QRS waveform was detected in the second capture detection region; and delivering pacing therapy based on the classification of the cardiac response as fusion or capture.
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Specification