Method and apparatus for performing mapping-type analysis including use of limited electrode sets
First Claim
1. A system for receiving a first set of electrical signals from a patient at less than twenty electrodes to obtain information that is conventionally available from a second set of electrical signals collected from a greater number of electrodes, said system comprising:
- transformation means for receiving the first set of electrical signals and for performing a linear transformation upon the first set of electrical signals, using a least-squares approximation, to generate a transformed vector representative of a map-type data set that is itself representative of the second set of electrical signals; and
extraction means for extracting at least one feature from said map-type data set.
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Abstract
A system (10) is disclosed that includes a monitor (16) for use in performing 12-lead electrocardiographic (ECG) and body surface mapping (BSM) analyses on a patient (12) with a single ten-electrode cable set (14). The monitor receives nine leads of data from the electrode cable set and initially preprocesses it to simplify further analysis. Then the data is transformed to produce a spatial distribution relative to the patient'"'"'s chest, representative of the data that would be collectible with a 192-electrode set. Feature extraction techniques are also described for use in evaluating transformed, as well as conventional, BSM data with respect to clinically evaluated populations. In that regard, features of interest are extracted from the data and statistically analyzed to detect select cardiac conditions.
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Citations
16 Claims
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1. A system for receiving a first set of electrical signals from a patient at less than twenty electrodes to obtain information that is conventionally available from a second set of electrical signals collected from a greater number of electrodes, said system comprising:
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transformation means for receiving the first set of electrical signals and for performing a linear transformation upon the first set of electrical signals, using a least-squares approximation, to generate a transformed vector representative of a map-type data set that is itself representative of the second set of electrical signals; and extraction means for extracting at least one feature from said map-type data set. - View Dependent Claims (2)
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3. A method of processing a first set of electrical signals, received from a patient at less than twenty electrodes and conventionally analyzed on the basis of the signals'"'"' temporal characteristics, to evaluate a cardiac characteristic of interest, said method comprising the steps of:
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transforming the first set of electrical signals into a transformed data set including information regarding the spatial distribution of the electrical signals relative to the patient; and processing the transformed data set to detect the cardiac characteristic of interest. - View Dependent Claims (4, 5, 6)
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7. A method of reducing the influence of noncardiac parameters on data representing the spatial distribution of electrical activity across a patient'"'"'s chest, said method comprising the steps of:
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generating a data set including data points associated with the electrical activity at a plurality of physical locations across the patient'"'"'s chest; normalizing each data point included in the data set to reduce the influence of noncardiac parameters on the data points. - View Dependent Claims (8)
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9. A method of evaluating the magnitude of a cardiac characteristic of interest such as the stenosis of right coronary, left circumflex, and left anterior descending arteries, based upon information regarding the electrical activity of a patient'"'"'s heart, said method comprising the steps of:
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processing the information to determine the presence of the cardiac characteristic of interest in a plurality of cardiac regions including the lateral, anterior, inferior, apical, and septal regions of the patient'"'"'s heart; producing a separate signal associated with each cardiac region in which the cardiac characteristic of interest is determined to be present; and combining the separate signals associated with the cardiac regions to produce an output indicative of the magnitude of the cardiac characteristic of interest. - View Dependent Claims (10)
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11. A method of detecting the presence of coronary artery stenosis in a patient based upon an evaluation of spatially distributed information concerning the QRST area associated with electrical signals generated by the patient'"'"'s heart, said method comprising the steps of:
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processing electrical signals generated by the patient'"'"'s heart to obtain the spatially distributed information concerning the QRST area associated with the electrical signals; and comparing the information collected with corresponding information obtained from a population including patients having clinically diagnosed stenosis to provide an output indicative of the patient'"'"'s coronary artery stenosis. - View Dependent Claims (12, 13)
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14. A method of detecting the susceptibility of a patient'"'"'s heart to an externally induced arrhythmia based upon an evaluation of spatially distributed information concerning the QRST area associated with electrical signals generated by the patient'"'"'s heart, said method comprising the steps of:
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processing electrical signals generated by the patient'"'"'s heart to obtain the spatially distributed information concerning the QRST area associated with the electrical signals; and comparing the information collected with corresponding information obtained from a population including patients having clinically diagnosed susceptibility to provide an output indicative of the patient'"'"'s susceptibility to an externally induced arrhythmia. - View Dependent Claims (15, 16)
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Specification