Method and apparatus for atrial arrhythmia episode detection
First Claim
1. A method of determining a flutter event within a cardiac signal in an implantable medical device, comprising:
- sensing the cardiac signal using a plurality of electrodes;
detecting, with a processor of the implantable medical device coupled to the plurality of electrodes, an R-wave within the sensed cardiac signal;
determining, with the processor, a sensing window associated with the R-wave detected within the sensed cardiac signal, the sensing window comprising a first portion and a second portion;
determining, with the processor, a first derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window;
determining, with the processor, a second derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window;
determining, with the processor, a sum of amplitudes of the second derivative signal within one or both of the first portion and the second portion of the sensing window; and
detecting, with the processor, the flutter event based on at least the determined sum of amplitudes.
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Accused Products
Abstract
A method and implantable medical device for determining a flutter event 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 having a first portion and a second portion. A first derivative signal and a second derivative signal are determined in response to the sensed cardiac signal within the first portion and the second portion of the sensing window, and a sum of amplitudes of the second derivative signal within one or both of the first portion and the second portion of the sensing window is determined, and the flutter event is determined in response to the determined sum of amplitudes.
115 Citations
21 Claims
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1. A method of determining a flutter event within a cardiac signal in an implantable medical device, comprising:
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sensing the cardiac signal using a plurality of electrodes; detecting, with a processor of the implantable medical device coupled to the plurality of electrodes, an R-wave within the sensed cardiac signal; determining, with the processor, a sensing window associated with the R-wave detected within the sensed cardiac signal, the sensing window comprising a first portion and a second portion; determining, with the processor, a first derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window; determining, with the processor, a second derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window; determining, with the processor, a sum of amplitudes of the second derivative signal within one or both of the first portion and the second portion of the sensing window; and detecting, with the processor, the flutter event based on at least the determined sum of amplitudes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable medical device for determining a flutter event within a cardiac signal, comprising:
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a plurality of electrodes sensing the cardiac signal; and a processor configured to detect an R-wave within the sensed cardiac signal, determine a sensing window associated with the R-wave detected within the sensed cardiac signal, the sensing window comprising a first portion and a second portion, determine a first derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window, determine a second derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window;
determine a sum of amplitudes of the second derivative signal within one or both of the first portion and the second portion of the sensing window, and detecting the flutter event based on at least the determined sum of amplitudes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A non-transitory computer-readable medium storing a set of instructions which cause a processor of an implantable medical device to perform a method of determining a flutter event within a cardiac signal, comprising:
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sensing the cardiac signal; detecting an R-wave within the sensed cardiac signal; determining a sensing window associated with the R-wave detected within the sensed cardiac signal, the sensing window comprising a first portion and a second portion; determining a first derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window; determining a second derivative signal of the segments of the sensed cardiac signal within the first portion and the second portion of the sensing window; determining a sum of amplitudes of the second derivative signal within one or both of the first portion and the second portion of the sensing window; and detecting the flutter event based on at least the determined sum of amplitudes.
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Specification