Method and apparatus for identifying cardiac risk
First Claim
Patent Images
1. A method comprising:
- identifying a plurality of cardiac cycles in an electrical signal representative of an electrocardiogram (ECG) from a subject;
for each of the plurality of cardiac cycles,identifying T-wave offset of the ECG, andidentifying a segment of an acoustical vibration representative of heart sounds from the subject, based upon a T-wave offset time of a corresponding ECG synchronized with the heart sounds;
constructing an array of the identified segments from each of the plurality of cycles;
computing heart sound and noise components of the acoustical vibration using blind source separation; and
detecting the presence of a heart sound based upon energy in the heart sound components and the noise components.
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Abstract
A cardiac-based metric is computed based upon characteristics of a subject'"'"'s cardiac function. In accordance with one or more embodiments, the end of a mechanical systole is identified for each of a plurality of cardiac cycles of a subject, based upon an acoustical vibration associated with closure of an aortic valve during the cardiac cycle. The end of an electrical systole of an electrocardiogram (ECG) signal for each cardiac cycle is also identified. A cardiac-based metric is computed, based upon a time difference between the end of the electrical systole and the end of the mechanical systole, for the respective cardiac cycles.
56 Citations
20 Claims
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1. A method comprising:
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identifying a plurality of cardiac cycles in an electrical signal representative of an electrocardiogram (ECG) from a subject; for each of the plurality of cardiac cycles, identifying T-wave offset of the ECG, and identifying a segment of an acoustical vibration representative of heart sounds from the subject, based upon a T-wave offset time of a corresponding ECG synchronized with the heart sounds; constructing an array of the identified segments from each of the plurality of cycles; computing heart sound and noise components of the acoustical vibration using blind source separation; and detecting the presence of a heart sound based upon energy in the heart sound components and the noise components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
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an input circuit; a computer circuit configured and arranged with the input circuit to; receive an electrical signal representative of an electrocardiogram (ECG) from a subject; identify a plurality of cardiac cycles in the electrical signal; for each of the plurality of cardiac cycles, identify T-wave offset of the ECG, and identify a segment of an acoustical vibration representative of heart sounds from the subject, based upon a T-wave offset time of a corresponding ECG synchronized with the heart sounds; construct an array of the identified segments from each of the plurality of cycles; compute heart sound and noise components of the acoustical vibration using blind source separation; and detect the presence of a heart sound based upon energy in the heart sound components and the noise components. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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means for identifying a plurality of cardiac cycles in an electrical signal representative of an electrocardiogram (ECG) from a subject; means for, for each of the plurality of cardiac cycles, identifying T-wave offset of the ECG, and identifying a segment of an acoustical vibration representative of heart sounds from the subject, based upon a T-wave offset time of a corresponding ECG synchronized with the heart sounds; means for constructing an array of the identified segments from each of the plurality of cycles; means for computing heart sound and noise components of the acoustical vibration using blind source separation; and means for detecting the presence of a heart sound based upon energy in the heart sound components and the noise components.
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Specification