Method and apparatus for detecting arrhythmias in a medical device
First Claim
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1. A method of detecting a cardiac event by a medical device, comprising:
- sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector;
separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a signal energy content metric of corresponding sensed cardiac signals not being within predetermined limits;
separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a noise to signal ratio of corresponding sensed cardiac signals not being less than a signal to noise threshold;
separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining corresponding sensed cardiac signals being associated with muscle noise;
separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a mean frequency of corresponding sensed cardiac signals not being less than a mean frequency threshold;
otherwise, separately identifying the first sensing vector and the second sensing vector as not being corrupted by noise; and
delivering therapy via the device in response to the identifying.
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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 whether a signal energy content metric of the sensed cardiac signals is within predetermined limits, determining whether a noise to signal ratio of the sensed cardiac signals is less than a signal to noise threshold, determining whether the sensed cardiac signals are associated with muscle noise, and determining whether a mean frequency corresponding to the sensed cardiac signals is less than a mean frequency threshold.
107 Citations
21 Claims
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1. A method of detecting a cardiac event by a medical device, comprising:
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sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector; separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a signal energy content metric of corresponding sensed cardiac signals not being within predetermined limits; separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a noise to signal ratio of corresponding sensed cardiac signals not being less than a signal to noise threshold; separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining corresponding sensed cardiac signals being associated with muscle noise; separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a mean frequency of corresponding sensed cardiac signals not being less than a mean frequency threshold; otherwise, separately identifying the first sensing vector and the second sensing vector as not being corrupted by noise; and delivering therapy via the device in response to the identifying. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory computer readable medium having computer executable instructions for performing a method comprising:
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sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector; separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a signal energy content metric of corresponding sensed cardiac signals not being within predetermined limits; separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a noise to signal ratio of corresponding sensed cardiac signals not being less than a signal to noise threshold; separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining corresponding sensed cardiac signals being associated with muscle noise; and separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a mean frequency of corresponding sensed cardiac signals not being less than a mean frequency threshold; otherwise, separately identifying the first sensing vector and the second sensing vector as not being corrupted by noise; and delivering therapy via the device in response to the identifying.
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21. A medical device, comprising:
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means for sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector; means for separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a signal energy content metric of corresponding sensed cardiac signals not being within predetermined limits; means for separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a noise to signal ratio of corresponding sensed cardiac signals not being less than a signal to noise threshold; means for separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining corresponding sensed cardiac signals being associated with muscle noise; means for separately identifying the first sensing vector and the second sensing vector as being corrupted by noise in response to determining a mean frequency of corresponding sensed cardiac signals not being less than a mean frequency threshold, and otherwise, separately identifying the first sensing vector and the second sensing vector as not being corrupted by noise; and means for delivering therapy via the device in response to the identifying.
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Specification