Method and apparatus for detecting arrhythmias in a medical device
First Claim
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1. A method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising:
- sensing cardiac signals from the plurality of electrodes;
determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector;
determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector;
generating a first pulse amplitude threshold based, at least in part, on the first number of inflections and a second pulse amplitude threshold based, at least in part, on the second number of inflections;
identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first number of inflections and the first pulse amplitude threshold;
identifying the second sensing vector as one of noisy and not noisy based, at least in part, on the second number of inflections and the second pulse amplitude threshold; and
delivering therapy based, at least in part, on the identifying of the first sensing vector as one of noisy and not noisy and the identifying of the second sensing vector as one of noisy and not noisy.
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Abstract
A method of detecting a cardiac event in a medical device that includes sensing cardiac signals from a plurality of electrodes forming a first sensing vector and a second sensing vector, determining inflections of the sensed cardiac signals, generating a pulse amplitude threshold in response to the determined inflections, and determining whether the inflections are indicative of noise in response to the determined inflections and the generated pulse amplitude threshold.
172 Citations
20 Claims
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1. A method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising:
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sensing cardiac signals from the plurality of electrodes; determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector; determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector; generating a first pulse amplitude threshold based, at least in part, on the first number of inflections and a second pulse amplitude threshold based, at least in part, on the second number of inflections; identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first number of inflections and the first pulse amplitude threshold; identifying the second sensing vector as one of noisy and not noisy based, at least in part, on the second number of inflections and the second pulse amplitude threshold; and delivering therapy based, at least in part, on the identifying of the first sensing vector as one of noisy and not noisy and the identifying of the second sensing vector as one of noisy and not noisy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20)
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11. A method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising:
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sensing cardiac signals from the plurality of electrodes; determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector during a predetermined window comprising a plurality of sub-segments; determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector during the predetermined window; generating a first pulse amplitude threshold in response to the first number of inflections and a second pulse amplitude threshold in response to the second number of inflections; determining an individual one of the plurality of sub-segments of the predetermined window sensed along the first sensing vector having a first maximum number of inflections; determining an individual one of the plurality of sub-segments of the predetermined window of sensed along the second sensing vector having a second maximum number of inflections; comparing each of the first pulse amplitude threshold and the second pulse amplitude threshold to a pulse threshold to obtain a first pulse amplitude comparison and a second pulse amplitude comparison, respectively; and comparing each of the first maximum number of inflections and the second maximum number of inflections to a noise pulse number threshold to obtain a first maximum number comparison and a second maximum number comparison, respectively; separately identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first pulse amplitude comparison and the first maximum number comparison, and the second sensing vector as one of noisy and not noisy based, at least in part, on the second pulse amplitude comparison and the second maximum number comparison; and delivering therapy based, at least in part, on the identifying of the, first sensing vector as one of noisy and not noisy and the identifying of the second sensing vector as one of noisy and noisy. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer readable medium having computer executable instructions for performing a method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising:
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sensing cardiac signals from the plurality of electrodes; determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector; determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector; generating a first pulse amplitude threshold based, at least in part, on the first number of inflections and a second pulse amplitude threshold based, at least in part, on the second number of inflections; identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first number of inflections and the first pulse amplitude threshold; identifying the second sensing vector as one of noisy and not noisy based, at least in part, on the second number of inflections and the second pulse amplitude threshold; and delivering therapy based, at least in part. on the identifying of the first sensing vector as one of noisy and not noisy and the identifying of the second sensing vector as one of noisy and not noisy.
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Specification