Cardiac biopotential analysis system and method
First Claim
1. A method of noninvasively detecting heart disorders that affect cardiac electrical activity, said method comprising the steps of:
- acquiring electrocardiographic signals from a surface of the body of a subject being analyzed through a surface electrode;
determining a waveform template representing a normal QRST waveform in said subject;
selecting a number of complexes that match said waveform template and storing said number of complexes for processing;
computing bispectral parameters from said stored number of selected complexes;
utilizing said bispectral parameters to quantify the contribution to overall cardiac physiologic function provided by the region probed by said surface electrode.
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Abstract
Disclosed is a cardiac biopotential analysis system and method for detecting, in a noninvasive manner, the degree of myocardial ischemia and the amount of cardiac electrophysiologic stability present in a subject. A suitable body surface electrode acquires the signal from a region of interest. The body surface electrocardiographic signals are then amplified, digitized and transmitted to a host computer where an arrhythmia free QRST complex template is chosen interactively. Using cross-correlation, 50 subsequent complexes that mask the template are extracted. A Fast Fourier Transform (FFT) is then performed on every beat. The FFT results of every QRST are used to produce a bispectral complex and real triple product arrays. Each point in these arrays is then averaged over the 50 previously acquired QRST complexes. The magnitude of each averaged point in the complex triple product arrays is then squared to produce a bispectral density array, which when divided by the complex real triple product array forms a bicoherence array. The bicoherence array provides a figure of merit for the detection and quantification of myocardial ischemia in the region probed by that lead. The array also provides a quantification of cardiac electrical properties.
238 Citations
25 Claims
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1. A method of noninvasively detecting heart disorders that affect cardiac electrical activity, said method comprising the steps of:
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acquiring electrocardiographic signals from a surface of the body of a subject being analyzed through a surface electrode; determining a waveform template representing a normal QRST waveform in said subject; selecting a number of complexes that match said waveform template and storing said number of complexes for processing; computing bispectral parameters from said stored number of selected complexes; utilizing said bispectral parameters to quantify the contribution to overall cardiac physiologic function provided by the region probed by said surface electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for noninvasively detecting heart disorders that affect cardiac electric activity, said system comprising
means for acquiring electrocardiographic signals from a surface of the body of a subject being analyzed means for determining a waveform template representing a normal QRST waveform in said subject; -
means for selecting a number of complexes that match said waveform template; means for storing said number of complexes for processing; means for computing bispectral parameters from said stored number of selected complexes. - View Dependent Claims (21, 22, 23, 24)
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25. A method of noninvasively detecting heart disorders that affect cardiac electrical activity, said method comprising the steps of:
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acquiring electrocardiographic signals from a surface of the body of a subject being analyzed; applying bispectral analysis to QRST complexes of said acquired electrocardiographic signal for a plurality of consecutive beats of the heart of the subject in order to quantity physiologic function that indicate heart disorders.
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Specification