Method and apparatus for cardiac arrhythmia classification using sample entropy
First Claim
1. A system for classifying cardiac arrhythmias, the system comprising:
- a signal input to receive a cardiac signal indicative of a detected arrhythmia episode;
an irregularity analyzer coupled to the signal input, the irregularity analyzer adapted to produce an irregularity parameter indicative of a degree of cycle length irregularity of the cardiac signal;
a complexity analyzer coupled to the signal input, the complexity analyzer adapted to produce a complexity parameter indicative of a degree of morphological complexity of the cardiac signal; and
an arrhythmia classifier coupled to the irregularity analyzer and the complexity analyzer, the arrhythmia classifier adapted to classify the detected arrhythmia episode based on the irregularity parameter and the complexity parameter.
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Abstract
An implantable medical device includes an arrhythmia detection and classification system that classifies an arrhythmia episode based on an irregularity parameter and/or a complexity parameter. The arrhythmia episode is detected from a cardiac signal. The irregularity parameter is indicative of the degree of cycle length irregularity of the cardiac signal and the complexity parameter is indicative of the degree of morphological complexity of the cardiac signal. One example of the irregularity parameter is an irregularity sample entropy, or a parameter related to the irregularity sample entropy, computed to indicate the cycle length irregularity. One example of the complexity parameter is a complexity sample entropy, or a parameter related to the complexity sample entropy, computed to indicate the morphological complexity. In one embodiment, the detected arrhythmia episode is classified using both the irregularity parameter and the complexity parameter.
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Citations
23 Claims
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1. A system for classifying cardiac arrhythmias, the system comprising:
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a signal input to receive a cardiac signal indicative of a detected arrhythmia episode;
an irregularity analyzer coupled to the signal input, the irregularity analyzer adapted to produce an irregularity parameter indicative of a degree of cycle length irregularity of the cardiac signal;
a complexity analyzer coupled to the signal input, the complexity analyzer adapted to produce a complexity parameter indicative of a degree of morphological complexity of the cardiac signal; and
an arrhythmia classifier coupled to the irregularity analyzer and the complexity analyzer, the arrhythmia classifier adapted to classify the detected arrhythmia episode based on the irregularity parameter and the complexity parameter. - View Dependent Claims (2, 6, 7, 8, 9, 10, 11, 12)
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3. The system of system 2, wherein the arrhythmia classifier is adapted to classify the detected arrhythmia episode as fibrillation if at least one of the detection of irregularity and the detection of complexity is indicated and to classify the detected arrhythmia episode as tachycardia if none of the detection of irregularity and the detection of complexity is indicated.
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4. The system of system 3, further comprising:
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a sensing circuit to sense an electrogram indicative of an atrial tachyarrhythmia episode; and
a tachyarrhythmia detector, coupled to the sensing circuit, to detect the atrial tachyarrhythmia episode from the electrogram, and wherein the arrhythmia classifier is adapted to classify the detected atrial tachyarrhythmia episode as atrial fibrillation if at least one of the detection of irregularity and the detection of complexity is indicated and to classify the detected atrial tachyarrhythmia episode as atrial flutter if none of the detection of irregularity and the detection of complexity is indicated.
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5. The system of system 3, further comprising:
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a sensing circuit to sense an electrogram indicative of a ventricular tachyarrhythmia episode; and
a tachyarrhythmia detector, coupled to the sensing circuit, to detect the ventricular tachyarrhythmia episode from the electrogram, and wherein the arrhythmia classifier is adapted to classify the detected ventricular tachyarrhythmia episode as ventricular fibrillation if at least one of the detection of irregularity and the detection of complexity is indicated and to classify the detected ventricular tachyarrhythmia episode as ventricular tachycardia if none of the detection of irregularity and the detection of complexity is indicated.
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13. A method for classifying cardiac arrhythmias, the method comprising:
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detecting an arrhythmia episode;
receiving a cardiac signal indicative of the arrhythmia episode;
computing an irregularity parameter indicative of a degree of cycle length irregularity of the cardiac signal;
computing a complexity parameter indicative of a degree of morphological complexity of the cardiac signal; and
classifying the arrhythmia episode based on the irregularity parameter and the complexity parameter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification