Non-captured intrinsic discrimination in cardiac pacing response classification
First Claim
1. A method of operating a cardiac device to classify a cardiac response to a pacing pulse, comprising:
- delivering the pacing pulse to a heart;
sensing a cardiac signal following delivery of the pacing pulse, the cardiac signal having an amplitude that varies over time;
determining if a peak of the amplitude of the sensed cardiac signal falls within one of a plurality of detection windows associated with a non-captured intrinsic response, each of the intrinsic detection windows finitely bounded in time and amplitude;
classifying the cardiac response to the pacing pulse as the non-captured intrinsic response if the sensed cardiac signal peak amplitude falls within one of the intrinsic detection windows; and
delivering pacing therapy based on the cardiac response classification.
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Abstract
Cardiac devices and methods discriminate non-captured intrinsic beats during evoked response detection and classification by comparing the features of a post-pace cardiac signal with expected features associated with a non-captured response with intrinsic activation. Detection of a non-captured response with intrinsic activation may be based on the peak amplitude and timing of the cardiac signal. The methods may be used to discriminate between a fusion or capture beat and a non-captured intrinsic beat. Discriminating between possible cardiac responses to the pacing pulse may be useful, for example, during automatic capture verification and/or a capture threshold test.
505 Citations
20 Claims
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1. A method of operating a cardiac device to classify a cardiac response to a pacing pulse, comprising:
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delivering the pacing pulse to a heart; sensing a cardiac signal following delivery of the pacing pulse, the cardiac signal having an amplitude that varies over time; determining if a peak of the amplitude of the sensed cardiac signal falls within one of a plurality of detection windows associated with a non-captured intrinsic response, each of the intrinsic detection windows finitely bounded in time and amplitude; classifying the cardiac response to the pacing pulse as the non-captured intrinsic response if the sensed cardiac signal peak amplitude falls within one of the intrinsic detection windows; and delivering pacing therapy based on the cardiac response classification. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a cardiac device to classify a cardiac response to a pacing pulse, comprising:
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delivering the pacing pulse to a heart; sensing a cardiac signal following delivery of the pacing pulse; determining if a peak of the sensed cardiac signal falls within a first capture detection window; determining if a peak of opposite polarity falls within a second capture detection window, each of the first and second capture detection windows finitely bounded by time and amplitude and associated with a captured response; and classifying the cardiac response to the pacing pulse as the captured response if the peaks of the sensed cardiac signal respectively fall within the first and second capture detection windows.
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13. A system for delivering a pacing therapy to a heart, comprising:
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a sensing block for sensing a cardiac signal from the heart following delivery of a pacing pulse to the heart, the cardiac signal having an amplitude that varies over time; a processor coupled to the sensing block, the processor configured to determine if a peak of the amplitude of the sensed cardiac signal falls within one of a plurality of detection windows associated with a non-captured intrinsic response, each of the intrinsic detection windows finitely bounded in time and amplitude; the processor further configured to classify the cardiac response to the pacing pulse as the non-captured intrinsic response if the sensed cardiac signal peak amplitude falls within one of the intrinsic detection windows; and a therapy block configured to deliver a pacing therapy based on the cardiac response classification. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification