Method and apparatus for verifying discriminating of tachycardia events in a medical device having dual sensing vectors
First Claim
1. A method for detecting a cardiac event in a medical device, the method comprising:
- obtaining a first cardiac signal sensed via a first set of electrodes forming a first sensing vector;
obtaining a second cardiac signal sensed via a second set of electrodes forming a second sensing vector;
identifying a plurality of beats within a first segment of the first cardiac signal and a second segment of the second cardiac signal, the second segment being sensed simultaneously with the first segment;
analyzing each of the plurality of beats of the first segment and the second segment, wherein the analyzing includes;
determining, for each of the plurality of beats, whether the respective beat matches a template beat;
classifying beats of the plurality of beats that match the template beat as match beats and beats of the plurality of beats that do not match the template beat as non-match beats;
determining, for each of the plurality of beats, individual pulses associated with the respective beats; and
classifying each of the plurality of beats as one of a high confidence beat or a low confidence beat based on one or more characteristics of the individual pulses associated with the respective beats, wherein the classifying comprises, for each of the plurality of beats;
determining a pulse width for each of the individual pulses;
comparing the pulse width to a pulse width threshold;
incrementing a narrow pulse count for each of the pulses in which the pulse width satisfies the pulse width threshold;
determining that the narrow pulse count one of does not satisfy a narrow pulse count threshold or satisfies the narrow pulse count threshold;
for each of the plurality of beats for which the narrow pulse count does not satisfy the narrow pulse count threshold, classifying the respective beat as a high confidence beat; and
for each of the plurality of beats for which the narrow pulse count satisfies the narrow pulse count threshold, classifying the respective beat as a low confidence beat;
identifying the first segment of the first cardiac signal and the second segment of the second cardiac signal as one of shockable or not shockable based on the classifications of the plurality of beats;
detecting the cardiac event based on at least on the identifications of the first segment of the first cardiac signal and the second segment of the second cardiac signal as one of shockable or not shockable, wherein the cardiac event requires therapy;
anddelivering the therapy for the cardiac event in response to the detecting.
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Abstract
A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector sensing a first interval and a second sensing vector simultaneously sensing a second, determining, for each of the first interval and the second interval, whether each beat of the plurality of beats is one of a match beat and a non-match beat, determining whether each beat of the plurality of beats is one of a high confidence beat and a low confidence beat, determining, for each of the first interval and the second interval, the number of beats determined to be both a non-match beat and a high confidence beat is greater than a non-match threshold, and determining whether to deliver therapy for the cardiac event in response to identifying of each of the first interval and the second interval as being one of shockable and not shockable.
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Citations
28 Claims
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1. A method for detecting a cardiac event in a medical device, the method comprising:
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obtaining a first cardiac signal sensed via a first set of electrodes forming a first sensing vector; obtaining a second cardiac signal sensed via a second set of electrodes forming a second sensing vector; identifying a plurality of beats within a first segment of the first cardiac signal and a second segment of the second cardiac signal, the second segment being sensed simultaneously with the first segment; analyzing each of the plurality of beats of the first segment and the second segment, wherein the analyzing includes; determining, for each of the plurality of beats, whether the respective beat matches a template beat; classifying beats of the plurality of beats that match the template beat as match beats and beats of the plurality of beats that do not match the template beat as non-match beats; determining, for each of the plurality of beats, individual pulses associated with the respective beats; and classifying each of the plurality of beats as one of a high confidence beat or a low confidence beat based on one or more characteristics of the individual pulses associated with the respective beats, wherein the classifying comprises, for each of the plurality of beats; determining a pulse width for each of the individual pulses; comparing the pulse width to a pulse width threshold; incrementing a narrow pulse count for each of the pulses in which the pulse width satisfies the pulse width threshold; determining that the narrow pulse count one of does not satisfy a narrow pulse count threshold or satisfies the narrow pulse count threshold; for each of the plurality of beats for which the narrow pulse count does not satisfy the narrow pulse count threshold, classifying the respective beat as a high confidence beat; and for each of the plurality of beats for which the narrow pulse count satisfies the narrow pulse count threshold, classifying the respective beat as a low confidence beat; identifying the first segment of the first cardiac signal and the second segment of the second cardiac signal as one of shockable or not shockable based on the classifications of the plurality of beats; detecting the cardiac event based on at least on the identifications of the first segment of the first cardiac signal and the second segment of the second cardiac signal as one of shockable or not shockable, wherein the cardiac event requires therapy; and delivering the therapy for the cardiac event in response to the detecting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 27)
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14. An medical device comprising:
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circuitry configured to obtain a first cardiac signal sensed via a first set of electrodes electrically coupled to the circuitry and forming a first sensing vector and to obtain a second cardiac signal sensed via a second set of electrodes electrically coupled to the circuitry and forming a second sensing vector; a processor configured to; identify a plurality of beats within a first segment of the first cardiac signal and a second segment of the second cardiac signal, the second segment being sensed simultaneously with the first segment; determine, for each of the plurality of beats, whether the respective beat matches a template beat; classify beats of the plurality of beats that match the template beat as match beats and beats of the plurality of beats that do not match the template beat as non-match beats; determine, for each of the plurality of beats, a plurality of pulses associated with the respective beats; classify each of the plurality of beats as one of a high confidence beat or a low confidence beat based on one or more characteristics of the plurality of pulses associated with the respective beats by at least, for each of the plurality of beats; determining a pulse width for each of the individual pulses; comparing the pulse width to a pulse width threshold; incrementing a narrow pulse count for each of the pulses in which the pulse width satisfies the pulse width threshold; determining that the narrow pulse count one of does not satisfy a narrow pulse count threshold or satisfies the narrow pulse count threshold; for each of the plurality of beats for which the narrow pulse count does not satisfy the narrow pulse count threshold, classifying the respective beat as a high confidence beat; and for each of the plurality of beats for which the narrow pulse count satisfies the narrow pulse count threshold, classifying the respective beat as a low confidence beat; identify the first segment of the first cardiac signal and the second segment of the second cardiac signal as one of shockable or not shockable based on the classifications of the plurality of beats; detecting a cardiac event based on at least on the identifications of the first segment of the first cardiac signal and the second segment of the second cardiac signal as one of shockable or not shockable, wherein the cardiac event requires therapy; and delivering the therapy for the cardiac event in response to the detecting. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28)
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Specification