Method and apparatus for atrial arrhythmia episode detection
First Claim
1. An implantable medical device for determining an atrial arrhythmia event within a cardiac signal, comprising:
- a plurality of electrodes configured to sense the cardiac signal; and
a processor configured to identify one or more R-waves within the sensed cardiac signal, determine an atrial arrhythmia score for identifying the arrhythmia event based at least on the one or more R-waves, determine a sensing window associated with the one or more R-waves, determine signal characteristics of the cardiac signal within the sensing window, determine whether the cardiac signal within the sensing window corresponds to a P-wave based on the determined signal characteristics, determine a signal to noise ratio of the cardiac signal within the sensing window, update the arrhythmia score when the P-wave is identified in the sensing window and the determined signal to noise ratio satisfies a signal to noise threshold.
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Abstract
Techniques and devices for implementing the techniques for adjusting atrial arrhythmia detection based on analysis of one or more P-wave sensing windows associated with one or more R-waves. An implantable medical device may determine signal characteristics of the cardiac signal within the P-wave sensing window, determine whether the cardiac signal within the sensing window corresponds to a P-wave based on the determined signal characteristics, determine a signal to noise ratio of the cardiac signal within the sensing window, update the arrhythmia score when the P wave is identified in the sensing window and the determined signal to noise ratio satisfies a signal to noise threshold.
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Citations
19 Claims
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1. An implantable medical device for determining an atrial arrhythmia event within a cardiac signal, comprising:
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a plurality of electrodes configured to sense the cardiac signal; and a processor configured to identify one or more R-waves within the sensed cardiac signal, determine an atrial arrhythmia score for identifying the arrhythmia event based at least on the one or more R-waves, determine a sensing window associated with the one or more R-waves, determine signal characteristics of the cardiac signal within the sensing window, determine whether the cardiac signal within the sensing window corresponds to a P-wave based on the determined signal characteristics, determine a signal to noise ratio of the cardiac signal within the sensing window, update the arrhythmia score when the P-wave is identified in the sensing window and the determined signal to noise ratio satisfies a signal to noise threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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sensing a cardiac signal on a plurality of electrodes; identifying one or more R-waves within the sensed cardiac signal; determining an atrial arrhythmia score for identifying an arrhythmia event based at least on the one or more R-waves; determining a sensing window associated with the one or more R-waves; determining signal characteristics of the cardiac signal within the sensing window; determining whether the cardiac signal within the sensing window corresponds to a P-wave based on the determined signal characteristics; determining a signal to noise ratio of the cardiac signal within the sensing window; increasing, when the cardiac signal within the sensing window is determined to correspond to a P-wave and the determined signal to noise ratio satisfies a signal to noise threshold, a P-wave evidence counter for atrial fibrillation by a first predetermined amount; increasing, when the cardiac signal within the sensing window is determined to correspond to a P-wave and the determined signal to noise ratio satisfies a signal to noise threshold, a P-wave evidence counter for atrial tachycardia by a second predetermined amount not equal to the first predetermined amount; and updating the arrhythmia score based on at least one of the P-wave evidence counter for atrial fibrillation and the P-wave evidence counter for atrial tachycardia. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification