Method and apparatus for determining alternans data of an ECG signal
First Claim
1. A method of determining alternans data of an ECG signal, the method comprising:
- determining at least one value representing at least one morphology feature of each beat of the ECG signal;
generating a set of data points based on a total quantity of values and a total quantity of beats, the data points each including a first value determined using a first mathematical function and a second value determined using a second mathematical function;
separating the data points into a first group of points and a second group of points;
generating a feature map by plotting the first group of points and the second group of points in order to assess an alternans pattern of variation; and
determining an estimated amplitude of the alternans pattern of variation by determining a first center point and a second center point of the data points and determining a distance between the first center and the second center point.
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Abstract
Method and apparatus for determining alternans data of an ECG signal. The method can include determining at least one value representing at least one morphology feature of each beat of the ECG signal and generating a set of data points based on a total quantity of values and a total quantity of beats. The data points can each include a first value determined using a first mathematical function and a second value determined using a second mathematical function. The method can also include several preprocessing algorithms to improve the signal to noise ratio. The method can also include separating the data points into a first group of points and a second group of points and generating a feature map by plotting the first group of points and the second group of points in order to assess an alternans pattern of variation. The feature map can be analyzed by statistical tests to determine the significance difference between groups and clusters.
153 Citations
15 Claims
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1. A method of determining alternans data of an ECG signal, the method comprising:
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determining at least one value representing at least one morphology feature of each beat of the ECG signal; generating a set of data points based on a total quantity of values and a total quantity of beats, the data points each including a first value determined using a first mathematical function and a second value determined using a second mathematical function; separating the data points into a first group of points and a second group of points; generating a feature map by plotting the first group of points and the second group of points in order to assess an alternans pattern of variation; and determining an estimated amplitude of the alternans pattern of variation by determining a first center point and a second center point of the data points and determining a distance between the first center and the second center point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for determining alternans data of an ECG signal, the device comprising:
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means for determining at least one value representing at least one morphology feature of each beat of the ECG signal; means for generating a set of data points based on a total quantity of values and a total quantity of beats, the data points each including a first value determined using a first mathematical function and a second value determined using a second mathematical function; means for separating the data points into a first group of points and a second group of points; and means for generating a feature map by plotting the first group of points and the second group of points in order to assess an alternans pattern of variations wherein the feature map is used to visually determine whether an alternans, pattern of variation exists, such that an alternans pattern of variation exists if the first group of points are spaced from the second group of points and an alternans pattern of variation does not exist if the first group of points are not spaced from the second group of points.
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15. A method of determining alternans data of an ECG signal, the method comprising:
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determining at least one value representing at least one morphology feature of each beat of the ECG signal; generating a set of data points based on a total quantity of values and a total quantity of beats, the data points each including a first value determined using a first mathematical function and a second value determined using a second mathematical function; separating the data points into a first group of points and a second group of points; generating a feature map by plotting the first group of points and the second group of points in order to assess an alternans pattern of variation; processing the data points using a cluster analysis, the cluster analysis generating a first cluster of points and a second cluster of points; comparing the first cluster of points with the first group of points; comparing the second cluster of points with the second group of points; and determining a value representative of match points between the first cluster of points and the first group of points and matched point between the second cluster of points and the second group of points.
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Specification