Method an apparatus for detection of heart disease
First Claim
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1. An apparatus for detecting heart disease from a cardiac acoustical signal consisting of a plurality of heartbeats, said apparatus comprising:
- means for converting the acoustical signal into an electrical signal;
means for digitizing said electrical signal; and
means for analyzing said digitized electrical signal,said analyzing means including;
means for calculating an average difference between the third and fourth partial correlation coefficients of said plurality of heartbeats;
means for determining the average power in said plurality of heartbeats; and
means for correlating said average difference between said third and fourth partial correlation coefficients with said average power whereby the presence of coronary artery disease may be ascertained.
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Abstract
A method and apparatus for detection of coronary artery disease. The apparatus records and analyzes that portion of the phonocardiogram lying between about 100 to 600 Hz. An electrocardiogram is also recorded and examined in order to pinpoint the diastolic window of PCG data. This window of data is subject to autocorrelation analysis and spectral analysis, resulting in a partial correlation coefficient index and a power density index. A linear combination of these two indices results in a Cardiac Screening Index which is indicative of the presence or absence of coronary artery disease.
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Citations
18 Claims
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1. An apparatus for detecting heart disease from a cardiac acoustical signal consisting of a plurality of heartbeats, said apparatus comprising:
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means for converting the acoustical signal into an electrical signal; means for digitizing said electrical signal; and means for analyzing said digitized electrical signal, said analyzing means including; means for calculating an average difference between the third and fourth partial correlation coefficients of said plurality of heartbeats; means for determining the average power in said plurality of heartbeats; and means for correlating said average difference between said third and fourth partial correlation coefficients with said average power whereby the presence of coronary artery disease may be ascertained. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for detecting heart disease comprising:
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a phonocardiogram microphone for detecting cardiac acoustical activity consisting of a plurality of heartbeats; electrodes for detecting an electrocardiogram associated with said cardiac acoustical activity; means for recording said cardiac acoustical activity and said electrocardiogram, said recording means being connected to said microphone and said electrodes; means for graphically displaying said electrocardiogram whereby Q-R-S peaks corresponding to said plurality of heartbeats may be displayed; means for correlating a given one of said Q-R-S peaks to a window of said cardiac acoustical activity, said window lying approximately between said third and fourth heart sounds; processor means for calculating an average difference between the third and fourth partial correlation coefficients associated with said plurality of heartbeats, for determining the average power in said plurality of heartbeats, and for correlating said average difference between said third and fourth partial correlation coefficients with said average power whereby the presence of coronary artery disease may be ascertained. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus for detecting heart disease comprising:
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a phonocardiogram microphone for detecting cardiac acoustical activity consisting of plurality of heartbeats; electrodes for detecting an electrocardiogram associated with said cardiac acoustical activity; an acoustic microphone for cancelling out ambient acoustical noise from said cardiac acoustical activity; a PCG amplifier connected to said phonocardiogram microphone; an ECG amplifier connected to said electrodes; means for recording said cardiac acoustical activity and said electrocardiogram, said recording means being connected to said PCG and ECG amplifiers; a bandpass filter connected to said PCG amplifier, whereby only that portion of said cardiac acoustical activity lying within the frequency range of approximately 100 to 600 Hertz is passed; means for digitizing said cardiac acoustical activity and said electrocardiogram, said digitizing means being operatively connected to said bandpass filter and said ECG amplifier; means for graphically displaying said electrocardiogram whereby Q-R-S peaks corresponding to said plurality of heartbeats may be displayed; means for correlating a given one of said Q-R-S peaks to a window of said cardiac acoustical activity, said window lying approximately between said third and fourth heart sounds; and processor means connected to said digitizing means and said acoustic microphone for calculating an average difference between the third and fourth partial correlation coefficients associated with said plurality of heartbeats, for determining the average power in said plurality of heartbeats, and for correlating said average difference between said third and fourth partial correlation coefficients with said average power whereby the presence of coronary artery disease may be ascertained.
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14. A method of detecting heart disease comprising the steps of:
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recording cardiac acoustical activity consisting of a plurality of heartbeats; filtering out that portion of said cardiac acoustical activity lying outside of the frequency range of approximately 100 to 600 Hertz; analyzing a plurality of windows of said filtered cardiac acoustical activity lying approximately between the third and fourth heart sounds of each of said plurality of heartbeats, said analyzing step including the stops of; calculating an average difference between the third and fourth partial correlation coefficients associated with said windows, yielding a PARCOR Index; determining the average normalized power in said plurality of heartbeats, yielding a Power Index; and linearly combining said PARCOR and Power Indices to yield a Cardiac Screening Index, said Cardiac Screening Index being indicative of the presence of coronary artery disease. - View Dependent Claims (15, 16, 17, 18)
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Specification