Method and apparatus for reducing noise in a medical device
First Claim
1. A method of detecting a cardiac event in a medical device comprising a plurality of electrodes and a processor, the method comprising:
- sensing a cardiac signal through the plurality of electrodes;
detecting, by the processor, RR intervals within the sensed cardiac signal;
determining, by the processor, that the detected RR intervals include a set of consecutive RR intervals that are each less than a detection interval, the set of consecutive RR intervals being at least a predetermined number of intervals;
after determining that the detected RR intervals include the set of consecutive RR intervals;
determining, by the processor, whether at least one of the RR intervals in the set of consecutive RR intervals is less than an interval threshold, the interval threshold being less than the detection interval; and
determining, by the processor, whether at least a noise metric threshold number of signal inflections occur during a predetermined noise metric window within the set of consecutive RR intervals; and
in response to determining that at least one of the RR intervals in the set of consecutive RR intervals is less than the interval threshold and that at least the noise metric threshold number of signal inflections occur during the predetermined noise metric window;
inhibiting, by the processor, detecting the set of consecutive RR intervals as a cardiac tachyarrhythmia, andinhibiting, by the processor, cardiac tachyarrhythmia detection for a period of time subsequent to inhibiting the detection of the set of consecutive RR intervals as a cardiac tachyarrhythmia.
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Abstract
A method and apparatus for detecting a cardiac event in a medical device that includes sensing a cardiac signal, detecting a cardiac event in response to the sensed signal, determining whether an interval associated with the cardiac signal is less than an interval threshold, determining a noise metric in response to an interval associated with the cardiac signal being less than the interval threshold, determining whether the noise metric is greater than a noise metric threshold, and determining whether to inhibit detecting in response to determining whether an interval associated with the cardiac signal is less than the interval threshold and determining whether the noise metric is greater than the noise metric threshold.
48 Citations
22 Claims
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1. A method of detecting a cardiac event in a medical device comprising a plurality of electrodes and a processor, the method comprising:
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sensing a cardiac signal through the plurality of electrodes; detecting, by the processor, RR intervals within the sensed cardiac signal; determining, by the processor, that the detected RR intervals include a set of consecutive RR intervals that are each less than a detection interval, the set of consecutive RR intervals being at least a predetermined number of intervals; after determining that the detected RR intervals include the set of consecutive RR intervals; determining, by the processor, whether at least one of the RR intervals in the set of consecutive RR intervals is less than an interval threshold, the interval threshold being less than the detection interval; and determining, by the processor, whether at least a noise metric threshold number of signal inflections occur during a predetermined noise metric window within the set of consecutive RR intervals; and in response to determining that at least one of the RR intervals in the set of consecutive RR intervals is less than the interval threshold and that at least the noise metric threshold number of signal inflections occur during the predetermined noise metric window; inhibiting, by the processor, detecting the set of consecutive RR intervals as a cardiac tachyarrhythmia, and inhibiting, by the processor, cardiac tachyarrhythmia detection for a period of time subsequent to inhibiting the detection of the set of consecutive RR intervals as a cardiac tachyarrhythmia. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medical device comprising:
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a plurality of electrodes to sense a cardiac signal; and a processor configured to; detect RR intervals within the sensed cardiac signal, determine that the detected RR intervals include a set of consecutive RR intervals that are each less than a detection interval, the set of consecutive RR intervals being at least a predetermined number of intervals, after determining that the detected RR intervals include the set of consecutive RR intervals; determine whether at least one of the RR intervals in the set of consecutive RR intervals is less than an interval threshold, the interval threshold being less than the detection interval, and determine whether at least a noise metric threshold number of signal inflections occur during a predetermined noise metric window within the set of consecutive RR intervals, and in response to determining that at least one of the RR intervals in the set of consecutive RR intervals is less than the interval threshold and that at least the noise metric threshold number of signal inflections occur during the predetermined noise metric window; inhibit detecting the set of consecutive RR intervals as a cardiac tachyarrhythmia, and inhibit cardiac tachyarrhythmia detection for a period of time subsequent to inhibiting the detection of the set of consecutive RR intervals as a cardiac tachyarrhythmia. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A non-transitory computer readable medium having computer executable instructions for causing a medical device to perform a method, the medical device comprising a plurality of electrodes and a processor, the method comprising:
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sensing a cardiac signal through the plurality of electrodes; detecting RR intervals within the sensed cardiac signal; determining that the detected RR intervals include a set of consecutive RR intervals that are each less than a detection interval, the set of consecutive RR intervals being at least a predetermined number of intervals; after determining that the detected RR intervals include the set of consecutive RR intervals; determining whether at least one of the RR intervals in the set of consecutive RR intervals is less than an interval threshold, the interval threshold being less than the detection interval; and determining whether at least a noise metric threshold number of signal inflections occur during a predetermined noise metric window within the set of consecutive RR intervals; and in response to determining that at least one of the RR intervals in the set of consecutive RR intervals is less than the interval threshold and that at least the noise metric threshold number of signal inflections occur during the predetermined noise metric window; inhibiting detecting the set of consecutive RR intervals as a cardiac tachyarrhythmia, and inhibiting cardiac tachyarrhythmia detection for a period of time subsequent to inhibiting the detection of the set of consecutive RR intervals as a cardiac tachyarrhythmia.
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Specification