Analysis of heart waveforms
First Claim
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1. A method of analyzing Ventricular Late Potential (VLP) comprising:
- measuring electrocardiogram signals of a patient in at least three dimensions and deriving three dimensional VLP values from the electrocardiogram signals;
determining an VLP onset point and a VLP offset point based on the three dimensional VLP values;
deriving an attractor for the VLP in at least a three dimensional voltage space from the VLP values between the VLP onset point and the VLP offset point;
estimating a fractal dimension of the VLP attractor from a quotient of Log(L)/Log(DD), where L is a total length of the VLP attractor between the VLP onset point and the VLP offset point, and DD is a spherical extent of the VLP attractor; and
analyzing a condition of a patient based on the estimate fractal dimension.
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Abstract
A method and apparatus of analysing Ventricular Late Potential (VLP) including determining a parameter related to the complexity of the VLP as a parameter for clinical evaluation. The method may include computing the fractal dimension of the attractor for the VLP as a parameter for clinical evaluation. The method may include performing a spectral analysis producing an assessment based on a discrete Hartley transform (DHT) vector spectrum by summing amplitude components between -f1 to -f2 and +f2 to +f1, where f1 is a number larger than f2.
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Citations
16 Claims
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1. A method of analyzing Ventricular Late Potential (VLP) comprising:
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measuring electrocardiogram signals of a patient in at least three dimensions and deriving three dimensional VLP values from the electrocardiogram signals; determining an VLP onset point and a VLP offset point based on the three dimensional VLP values; deriving an attractor for the VLP in at least a three dimensional voltage space from the VLP values between the VLP onset point and the VLP offset point; estimating a fractal dimension of the VLP attractor from a quotient of Log(L)/Log(DD), where L is a total length of the VLP attractor between the VLP onset point and the VLP offset point, and DD is a spherical extent of the VLP attractor; and analyzing a condition of a patient based on the estimate fractal dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of analyzing Ventricular Late Potential comprising:
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measuring electrocardiogram signals of a patient in at least three dimensions and deriving three dimensional VLP values from the electrocardiogram signals; performing a discrete Hartley transform (DHT) of the electrocardiogram signals to obtain a vector spectrum of amplitude components; summing amplitude components between -f1 to -f2 and +f2 to +f1, where f1 is a number larger than f2, of the vector spectrum obtained by performing the discrete Hartley transform; and assessing a condition of a patient based on the summation of amplitude components of the vector spectrum of the discrete Hartley transform. - View Dependent Claims (11)
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12. An apparatus to analyze Ventricular Late Potential (VLP) comprising:
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means for receiving electrocardiogram signals from a patient and for deriving three dimensional VLP values from the electrocardiogram signals; means for determining VLP onset points and VLP offset points based on the three dimensional VLP values; means for deriving an attractor for the VLP values in at least a three dimensional voltage space from the VLP values between the VLP onset point and the VLP offset point; and means for estimating a fractal dimension of the VLP attractor from a quotient of Log(L)/Log(DD), where L is a total length of the VLP attractor between the VLP onset point and the VLP offset point, and DD is a spherical extent of the VLP attractor, so that the estimated fractal dimension can be used to analyze the condition of the patient. - View Dependent Claims (13, 14, 15, 16)
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Specification