Method and apparatus for atrial arrhythmia episode detection
First Claim
1. A method of determining an atrial arrhythmia event in an implantable medical device, comprising:
- sensing a cardiac signal;
determining an atrial arrhythmia score for identifying the arrhythmia event in response to the sensed cardiac signal;
determining a sensing window in response to the sensed cardiac signal, the sensing window having a first portion and a second portion;
determining a second derivative signal of the sensed cardiac signal within the first portion and the second portion of the sensing window;
determining signal characteristics of the sensed cardiac signal within the first portion and within the second portion;
determining whether the sensed cardiac signal within the first portion and within the second portion corresponds to a P-wave in response to the determined signal characteristics;
determining whether a signal to noise ratio of the sensed cardiac signal within the first portion and the second portion of the sensing window is satisfied based on amplitudes of the second derivative signal;
determining whether to update the arrhythmia score in response to the determined P-wave and the determined signal to noise ratio; and
determining whether to deliver an arrhythmia therapy in response to the updated arrhythmia score.
1 Assignment
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Accused Products
Abstract
A method and implantable medical device for determining an atrial arrhythmia event that includes sensing a cardiac signal, determining an atrial arrhythmia score for identifying the arrhythmia event in response to the sensed cardiac signal, determining a sensing window in response to the sensed cardiac signal, the sensing window having a first portion and a second portion, determining signal characteristics of the sensed cardiac signal within the first portion and within the second portion, determining whether the sensed cardiac signal within the first portion and within the second portion corresponds to a P-wave in response to the determined signal characteristics, determining whether a signal to noise ratio of the sensed cardiac signal within the first portion and the second portion of the sensing window is satisfied, determining whether to update the arrhythmia score in response to the determined P-wave and the determined signal to noise ratio, and determining whether to delivery an arrhythmia therapy in response to the updated arrhythmia score.
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Citations
22 Claims
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1. A method of determining an atrial arrhythmia event in an implantable medical device, comprising:
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sensing a cardiac signal; determining an atrial arrhythmia score for identifying the arrhythmia event in response to the sensed cardiac signal; determining a sensing window in response to the sensed cardiac signal, the sensing window having a first portion and a second portion; determining a second derivative signal of the sensed cardiac signal within the first portion and the second portion of the sensing window; determining signal characteristics of the sensed cardiac signal within the first portion and within the second portion; determining whether the sensed cardiac signal within the first portion and within the second portion corresponds to a P-wave in response to the determined signal characteristics; determining whether a signal to noise ratio of the sensed cardiac signal within the first portion and the second portion of the sensing window is satisfied based on amplitudes of the second derivative signal; determining whether to update the arrhythmia score in response to the determined P-wave and the determined signal to noise ratio; and determining whether to deliver an arrhythmia therapy in response to the updated arrhythmia score. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device for determining an atrial arrhythmia event, comprising:
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a plurality of electrodes sensing the cardiac signal; and a processor configured to determine an atrial arrhythmia score for identifying the arrhythmia event in response to the sensed cardiac signal, determine a sensing window in response to the sensed cardiac signal, the sensing window having a first portion and a second portion, determine a second derivative signal of the sensed cardiac signal within the first portion and the second portion of the sensing window, determine signal characteristics of the sensed cardiac signal within the first portion and within the second portion, determine whether the sensed cardiac signal within the first portion and within the second portion corresponds to a P-wave in response to the determined signal characteristics, determine whether a signal to noise ratio of the sensed cardiac signal within the first portion and the second portion of the sensing window is satisfied based on amplitudes of the second derivative signal, determine whether to update the arrhythmia score in response to the determined P-wave and the determined signal to noise ratio, and determine whether to deliver an arrhythmia therapy in response to the updated arrhythmia score. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An implantable medical device for determining an atrial arrhythmia event, comprising:
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a plurality of electrodes sensing the cardiac signal; and a processor configured to determine an atrial arrhythmia score for identifying the arrhythmia event in response to the sensed cardiac signal, determine a sensing window in response to the sensed cardiac signal, the sensing window having a first portion and a second portion, determine signal characteristics of the sensed cardiac signal within the first portion and within the second portion, determine whether the sensed cardiac signal within the first portion and within the second portion corresponds to a P-wave in response to the determined signal characteristics, determine whether a signal to noise ratio of the sensed cardiac signal within the first portion and the second portion of the sensing window is satisfied, determine whether to update the arrhythmia score in response to the determined P-wave and the determined signal to noise ratio, and determine whether to deliver an arrhythmia therapy in response to the updated arrhythmia score, wherein the processor is further configured to determine, in response to the signal to noise ratio not being satisfied, whether the sensed cardiac signal within the first portion and within the second portion of the sensing window corresponds to one of a flutter event and a noise event. - View Dependent Claims (19)
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20. An implantable medical device for determining an atrial arrhythmia event, comprising:
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a plurality of electrodes sensing the cardiac signal; and a processor configured to determine an atrial arrhythmia score for identifying the arrhythmia event in response to the sensed cardiac signal, determine a sensing window in response to the sensed cardiac signal, the sensing window having a first portion and a second portion, determine signal characteristics of the sensed cardiac signal within the first portion and within the second portion, determine whether the sensed cardiac signal within the first portion and within the second portion corresponds to a P-wave in response to the determined signal characteristics, determine whether a signal to noise ratio of the sensed cardiac signal within the first portion and the second portion of the sensing window is satisfied, determine whether to update the arrhythmia score in response to the determined P-wave and the determined signal to noise ratio, and determine whether to deliver an arrhythmia therapy in response to the updated arrhythmia score, wherein the atrial arrhythmia event comprises one of an atrial tachycardia event and an atrial fibrillation event, the processor further configured to increase, in response to the sensed cardiac signal within the first portion and within the second portion corresponding to a P-wave, a P-wave evidence counter for atrial fibrillation by a first predetermined amount and increasing a P-wave evidence counter for atrial tachycardia by a second predetermined amount not equal to the first predetermined amount. - View Dependent Claims (21)
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22. 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 an atrial arrhythmia event, comprising:
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sensing a cardiac signal; determining an atrial arrhythmia score for identifying the arrhythmia event in response to the sensed cardiac signal; determining a sensing window in response to the sensed cardiac signal, the sensing window having a first portion and a second portion; determining a second derivative signal of the sensed cardiac signal within the first portion and the second portion of the sensing window; determining signal characteristics of the sensed cardiac signal within the first portion and within the second portion; determining whether the sensed cardiac signal within the first portion and within the second portion corresponds to a P-wave in response to the determined signal characteristics; determining whether a signal to noise ratio of the sensed cardiac signal within the first portion and the second portion of the sensing window is satisfied based on amplitudes of the second derivative signal; determining whether to update the arrhythmia score in response to the determined P-wave and the determined signal to noise ratio; and determining whether to deliver an arrhythmia therapy in response to the updated arrhythmia score.
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Specification