Atrial arrhythmia episode detection in a cardiac medical device
First Claim
1. A method of identifying a cardiac waveform in a medical device, comprising:
- sensing cardiac signals;
identifying R-waves in the cardiac signal;
determining P-waves associated with each of the identified R-waves;
determining one or more parameters associated with each of the determined P-waves;
determining relative changes of the determined P-waves based on the one or more determined parameters;
determining whether each of the determined P-waves match within a match threshold based on the determined relative changes; and
generating a P-wave template based on the determined P-waves in response to determining that each of the determined P-waves match within the match threshold.
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Accused Products
Abstract
A method and medical device for identifying a cardiac waveform that includes sensing cardiac signals, determining a plurality of RR-intervals in response to the sensed cardiac signals, determining R-waves associated with the plurality of RR-intervals, determining P-waves in response to the determined R-waves, determining parameters associated with each P-wave, determining relative changes of the P-waves in response to the determined parameters, determining whether each of the P-waves match within a match threshold in response to the determined relative changes, and generating a P-wave template in response to each of the P-waves matching within the match threshold.
117 Citations
33 Claims
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1. A method of identifying a cardiac waveform in a medical device, comprising:
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sensing cardiac signals; identifying R-waves in the cardiac signal; determining P-waves associated with each of the identified R-waves; determining one or more parameters associated with each of the determined P-waves; determining relative changes of the determined P-waves based on the one or more determined parameters; determining whether each of the determined P-waves match within a match threshold based on the determined relative changes; and generating a P-wave template based on the determined P-waves in response to determining that each of the determined P-waves match within the match threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical device for detecting a cardiac event, comprising:
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a sense amplifier configured to obtain a cardiac signal via at least one sensing electrode; and a processor configured to identify R-waves in the sense cardiac signal, determine P-waves associated with each of the identified R-waves, determine one or more parameters associated with each of the determined P-waves, determine relative changes of the determined P-waves based on the one or more determined parameters, determine whether each of the determined P-waves match within a match threshold in response to the determined relative changes, and generate a P-wave template based on the determined P-waves in response to determining that each of the determined P-waves match within the match threshold. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A non-transitory, computer-readable storage medium storing instructions for causing a processor included in a medical device to perform a method for identifying a cardiac waveform, the method comprising:
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sensing cardiac signals; identifying R-waves in the cardiac signal; determining P-waves associated with each of the identified R-waves; determining one or more parameters associated with each of the determined P-wave; determining relative changes of the determined P-waves based on the one or more determined parameters; determining whether each of the determined P-waves match within a match threshold based on the determined relative changes; and generating a P-wave template in response to determining that each of the determined P-waves matching within the match threshold.
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28. A cardiac medical device for detecting a cardiac event and delivering a therapy for treating atrial fibrillation, comprising:
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a sense amplifier configured to obtain a cardiac signal associated only with a ventricle of a heart; a processor configured to identify R-waves in the sensed cardiac signals, determine P-waves associated with each of the identified R-waves, determine one or more parameters associated with each of the determined P-waves, determine relative changes of the determined P-waves based on the one or more determined parameters, determine whether each of the determined P-waves match within a match threshold in response to the determined relative changes, and generate a P-wave template based on the determined P-waves in response to determining that each of the determined P-waves match within the match threshold; and an output circuit to deliver therapy to the heart via an electrode based at least in part to comparing the cardiac signal to the generated template. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification