Method and apparatus for detection of intrinsic depolarization following high energy cardiac electrical stimulation
First Claim
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1. A method performed by a medical device system, comprising:
- delivering a electrical stimulation pulse to a patient that produces a post-stimulation polarization signal;
tracking a decaying slope of the post-stimulation polarization signal;
detecting a cardiac electrical signal superimposed on the post-stimulation polarization signal in response to detecting a change in polarity of the decaying slope of the post-stimulation polarization signal;
determining a feature of the detected cardiac electrical signal;
comparing the feature to criteria that differentiate an intrinsic cardiac event during the post-stimulation polarization signal from an evoked response signal; and
identifying the detected cardiac electrical signal as the intrinsic cardiac event if the feature meets the criteria.
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Abstract
A medical device is configured to deliver a high-energy electrical stimulation pulse to a patient that produces a post-stimulation polarization signal. A cardiac signal analyzer of the medical device is configured to detect a cardiac electrical signal superimposed on the post-stimulation polarization signal, determine at least one feature of the detected cardiac electrical signal, compare the feature to criteria that differentiate an intrinsic cardiac event during the post-stimulation polarization signal from an evoked response signal and identify the detected cardiac electrical signal as the intrinsic cardiac event if the feature meets the criteria.
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Citations
23 Claims
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1. A method performed by a medical device system, comprising:
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delivering a electrical stimulation pulse to a patient that produces a post-stimulation polarization signal; tracking a decaying slope of the post-stimulation polarization signal; detecting a cardiac electrical signal superimposed on the post-stimulation polarization signal in response to detecting a change in polarity of the decaying slope of the post-stimulation polarization signal; determining a feature of the detected cardiac electrical signal; comparing the feature to criteria that differentiate an intrinsic cardiac event during the post-stimulation polarization signal from an evoked response signal; and identifying the detected cardiac electrical signal as the intrinsic cardiac event if the feature meets the criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical device, comprising:
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a therapy delivery module configured to deliver a electrical stimulation pulse to a patient that produces a post-stimulation polarization signal; and a cardiac signal analyzer configured to receive a cardiac electrical signal developed across a pair of electrodes coupled to the medical device and configured to; track the post-stimulation polarization signal by a peak tracking circuit to detect a change in polarity of the decaying slope of the post-stimulation polarization signal; detect from the received electrical signal a cardiac electrical signal superimposed on the post-stimulation polarization signal in response to detecting the change in polarity of the decaying slope of the post-stimulation polarization signal; determine a feature of the detected cardiac electrical signal; compare the feature to criteria that differentiate an intrinsic cardiac event during the post-stimulation polarization signal from an evoked response signal; and identify the detected cardiac electrical signal as the intrinsic cardiac event if the feature meets the criteria. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23)
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22. A non-transitory, computer-readable medium storing a set of instructions which, when executed by a processor of a medical device, cause the medical device to:
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deliver a electrical stimulation pulse to a patient that produces a post-stimulation polarization signal; track the post-stimulation polarization signal by a peak tracking circuit to detect a change in polarity of the decaying slope of the post-stimulation polarization signal; detect a cardiac electrical signal superimposed on the post-stimulation polarization signal in response to detecting the change in polarity of the decaying slope of the post-stimulation polarization signal; determine a feature of the detected cardiac electrical signal; compare the feature to criteria that differentiate an intrinsic cardiac event during the post-stimulation polarization signal from an evoked response signal; and identify the detected cardiac electrical signal as the intrinsic cardiac event if the feature meets the criteria.
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Specification