Method and apparatus for atrial arrhythmia episode detection
First Claim
1. A method of determining noise in response to a cardiac signal in an implantable medical device, comprising:
- sensing the cardiac signal;
determining a sensing window in response to the sensed cardiac signal, the sensing window comprising a first portion and a second portion;
determining a first derivative signal in response to the sensed cardiac signal within only one of the first portion and the second portion of the sensing window;
determining a second derivative signal in response to the sensed cardiac signal within the one of the first portion and the second portion of the sensing window;
determining whether an amplitude of the second derivative signal satisfies an amplitude threshold; and
determining noise in response to the amplitude of the second derivative signal satisfying the amplitude threshold.
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Accused Products
Abstract
A method and implantable medical device for determining noise in response to a cardiac signal that includes sensing the cardiac signal, determining a sensing window in response to the sensed cardiac signal, the sensing window comprising a first portion and a second portion, determining a first derivative signal in response to the sensed cardiac signal within only one of the first portion and the second portion of the sensing window, determining a second derivative signal in response to the sensed cardiac signal within the one of the first portion and the second portion of the sensing window, determining whether an amplitude of the second derivative signal satisfies an amplitude threshold, and determining noise in response to the amplitude of the second derivative signal satisfying the amplitude threshold.
121 Citations
32 Claims
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1. A method of determining noise in response to a cardiac signal in an implantable medical device, comprising:
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sensing the cardiac signal; determining a sensing window in response to the sensed cardiac signal, the sensing window comprising a first portion and a second portion; determining a first derivative signal in response to the sensed cardiac signal within only one of the first portion and the second portion of the sensing window; determining a second derivative signal in response to the sensed cardiac signal within the one of the first portion and the second portion of the sensing window; determining whether an amplitude of the second derivative signal satisfies an amplitude threshold; and determining noise in response to the amplitude of the second derivative signal satisfying the amplitude threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable medical device for determining noise within response to a cardiac signal, comprising:
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a plurality of electrodes sensing the cardiac signal; and a processor configured to determine a P-wave sensing window of the sensed cardiac signal, divide the P-wave sensing window into a baseline portion and a P-wave portion, determine a first derivative signal of the sensed cardiac signal within at least one of the baseline portion and the P-wave portion of the sensing window, determine a second derivative signal of the sense cardiac signal within the at least one of the baseline portion and the P-wave of the sensing window, determine whether an amplitude of the second derivative signal satisfies an amplitude threshold, and determine noise in response to the amplitude of the second derivative signal satisfying the amplitude threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A computer-readable medium storing a set of instructions which cause a processor of an implantable medical device to perform a method of determining a noise of a cardiac signal, comprising:
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sensing the cardiac signal; determining a sensing window of the sensed cardiac signal, the sensing window comprising a first portion and a second portion; determining a first derivative signal in response to the sensed cardiac signal within only one of the first portion and the second portion of the sensing window; determining a second derivative signal in response to the sensed cardiac signal within the one of the first portion and the second portion of the sensing window; determining whether an amplitude of the second derivative signal satisfies an amplitude threshold; and determining noise in response to the amplitude of the second derivative signal satisfying the amplitude threshold.
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21. An implantable medical device for determining noise in a cardiac signal, comprising:
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a plurality of electrodes configured to sense the cardiac signal; and a processor configured to determine a P-wave sensing window associated with at least one cardiac event in the sensed cardiac signal, the sensing window comprising a first portion corresponding to a baseline portion and a second portion corresponding to a P-wave portion, determine a first derivative signal of the cardiac signal within the sensing window, determine a second derivative signal of the cardiac signal within the sensing window, identify a noise event within the sensing window based at least on the analysis of amplitudes of the second derivative signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification