Apparatus and method for detecting myocardial ischemia using analysis of high frequency components of an electrocardiogram
First Claim
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1. ECG apparatus comprising:
- an ECG input for obtaining wideband ECG signals;
a high frequency analyzer configured for;
obtaining high frequency QRS components from a QRS complex within said ECG signals and a low frequency envelope around said high frequency QRS components, andidentifying within said envelope at least one reduced amplitude zone—
RAZ—
present within a given QRS complex; and
a RAZ quantifier configured for obtaining a quantification of said at least one RAZ region within said QRS complex, wherein said quantification is used to compute an index that is proportional to an area of said RAZ within said QRS complex.
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Abstract
ECG apparatus comprises an ECG input for obtaining ECG signals; a high frequency analyzer configured for obtaining high frequency QRS components from a QRS complex within said ECG signals and identifying therein at least one reduced amplitude zone—RAZ—present within a given QRS complex; and a RAZ quantifier configured for obtaining a quantification of said at least one RAZ region within said QRS complex.
32 Citations
21 Claims
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1. ECG apparatus comprising:
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an ECG input for obtaining wideband ECG signals; a high frequency analyzer configured for; obtaining high frequency QRS components from a QRS complex within said ECG signals and a low frequency envelope around said high frequency QRS components, and identifying within said envelope at least one reduced amplitude zone—
RAZ—
present within a given QRS complex; anda RAZ quantifier configured for obtaining a quantification of said at least one RAZ region within said QRS complex, wherein said quantification is used to compute an index that is proportional to an area of said RAZ within said QRS complex. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. ECG method comprising:
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obtaining ECG signals; obtaining high frequency QRS components from a QRS complex within said ECG signals, obtaining a low frequency envelope around said high frequency components, identifying therein at least one reduced amplitude zone—
RAZ—
present within a given QRS complex; andobtaining a quantification of said at least one RAZ region within said QRS complex, wherein said quantification is proportional to a size of said RAZ within said QRS complex. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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13. ECG method comprising:
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obtaining ECG signals; obtaining high frequency QRS components from a QRS complex within said ECG signals, obtaining a low frequency envelope around said high frequency components, identifying therein at least one reduced amplitude zone—
RAZ—
present within a given QRS complex; andobtaining a quantification of said at least one RAZ region within said QRS complex, wherein said obtaining a quantification comprising obtaining a ratio between an area of the at least one RAZ and an area within the envelope.
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14. ECG method comprising:
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obtaining ECG signals; obtaining high frequency QRS components from a QRS complex within said ECG signals, obtaining a low frequency envelope around said high frequency components, identifying therein at least one reduced amplitude zone—
RAZ—
present within a given QRS complex; andobtaining a quantification of said at least one RAZ region within said QRS complex, wherein said area of the at least one RAZ is an area over a local minimum in said envelope between two flanking maxima of said envelope, or wherein said area of at least one RAZ is measured by connecting said respective flanking maxima, or wherein said area of at least one RAZ is measured under a horizontal line at a height of one of said flanking maxima, or wherein said area of at least one RAZ is measured by connecting peaks of said flanking maxima, or wherein said area of at least one RAZ is measured by estimating an expected peak without RAZ by extrapolation and calculating a difference in areas.
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Specification