Atrial Fibrillation Classification Using Power Measurement
First Claim
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1. An apparatus for detecting arrhythmias within a body, the apparatus comprising:
- an input stage to receive an electrocardiogram signal from a body connected thereto through a detection electrode input, wherein the input stage is a real-time dynamically adjustable signal transformation stage configured to condition the electrocardiogram signal;
an analysis stage coupled to the input stage to receive the conditioned electrocardiogram signal from the input stage, wherein the analysis stage comprises,a transformation stage wherein a frequency, time, or phase domain representation of the conditioned electrocardiogram signal is formed from the conditioned electrocardiogram signal being in a time-domain signal, andan evaluation stage, wherein frequency, time or phase domain features related to the arrhythmias are extracted from the frequency, time, or phase domain representation, wherein the evaluation stage is configured to determine a summed energy over a predetermined range of frequencies, time intervals or phases for the frequency, time, or phase domain representation and configured to normalize the summed energy to form a spectral frequency dispersion metric (SFDM), spectral time domain dispersion metric (STDM), and/or spectral phase domain dispersion metric (SPDM) over the predetermined range of frequencies, time intervals, or phases; and
a classification stage coupled to the evaluation stage to receive the SFDM, STDM, and/or SPDM and to determine whether the body is experiencing the arrhythmias.
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Abstract
An atrial fibrillation classification system collects celectrocardiogram signals and converts them to a frequency, time, or phase domain representation for analysis. An evaluation stage extracts energy density profile over a range of frequencies, time intervals, or phases, which is then summed and normalized to form dispersion metrics. The system then analyzes the dispersion metrics, in their respective domains, to determine whether a patient is experiencing an arrhythmia and then to classify the type of arrhythmia being experienced.
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Citations
35 Claims
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1. An apparatus for detecting arrhythmias within a body, the apparatus comprising:
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an input stage to receive an electrocardiogram signal from a body connected thereto through a detection electrode input, wherein the input stage is a real-time dynamically adjustable signal transformation stage configured to condition the electrocardiogram signal; an analysis stage coupled to the input stage to receive the conditioned electrocardiogram signal from the input stage, wherein the analysis stage comprises, a transformation stage wherein a frequency, time, or phase domain representation of the conditioned electrocardiogram signal is formed from the conditioned electrocardiogram signal being in a time-domain signal, and an evaluation stage, wherein frequency, time or phase domain features related to the arrhythmias are extracted from the frequency, time, or phase domain representation, wherein the evaluation stage is configured to determine a summed energy over a predetermined range of frequencies, time intervals or phases for the frequency, time, or phase domain representation and configured to normalize the summed energy to form a spectral frequency dispersion metric (SFDM), spectral time domain dispersion metric (STDM), and/or spectral phase domain dispersion metric (SPDM) over the predetermined range of frequencies, time intervals, or phases; and a classification stage coupled to the evaluation stage to receive the SFDM, STDM, and/or SPDM and to determine whether the body is experiencing the arrhythmias. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus for detecting arrhythmias within a body, the apparatus comprising:
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an input stage to receive an electrocardiogram signal from a body connected thereto through a detection electrode input, wherein the input stage is a real-time dynamically adjustable signal transformation stage configured to condition the electrocardiogram signal; an analysis stage coupled to the input stage to receive the conditioned electrocardiogram signal from the input stage, wherein the analysis stage comprises, a transformation stage wherein a time domain profile of the conditioned electrocardiogram signal is formed, and an evaluation stage configured to determine, over the time domain profile, at a plurality of predetermined time intervals, the number of times a spectral time domain dispersion metric (STDM) is in one or more count ranges over the plurality of predetermined time intervals, wherein the count ranges correspond to one or more arrhythmias; and a classification stage coupled to the evaluation stage to receive the STDM and to determine whether the body is experiencing the arrhythmias. - View Dependent Claims (33, 34)
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35-43. -43. (canceled)
Specification