Assessment of sleep quality and sleep disordered breathing based on cardiopulmonary coupling
First Claim
1. A method of assessing sleep quality, comprising:
- accessing a first series of physiological data representing respiration dynamics of the subject;
accessing a second series of physiological data representing heart rate dynamics of the subject, said second series being temporally aligned with said first series; and
detecting cardiopulmonary coupling between said first series and said second series by determining a cross-spectra power and a coherence for a plurality of temporally aligned subsets of data from said first series and said second series, and computing a coherent cross power for each temporally aligned subset, said coherent cross power being computed from the product of said cross-spectra power and said coherence of each temporally aligned subset.
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Accused Products
Abstract
An assessment of sleep quality and sleep disordered breathing is determined from the cardiopulmonary coupling between two physiological data series. In an embodiment, an R-R interval series is derived from an electrocardiogram (ECG) signal. The normal beats from the R-R interval series are extracted to produce a normal-to-normal (NN) interval series. The amplitude variations in the QRS complex are used to extract to a surrogate respiration signal (i.e., ECG-derived respiration (EDR)) that is associated with the NN interval series. The two series are corrected to remove outliers, and resampled. The cross-spectral power and coherence of the two resampled signals are calculated over a plurality of coherence windows. For each coherence window, the product of the coherence and cross-spectral power is used to calculate coherent cross power. Using the appropriate thresholds for the coherent cross power, the proportion of sleep spent in CAP, non-CAP, and wake and/or REM are determined.
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Citations
24 Claims
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1. A method of assessing sleep quality, comprising:
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accessing a first series of physiological data representing respiration dynamics of the subject; accessing a second series of physiological data representing heart rate dynamics of the subject, said second series being temporally aligned with said first series; and detecting cardiopulmonary coupling between said first series and said second series by determining a cross-spectra power and a coherence for a plurality of temporally aligned subsets of data from said first series and said second series, and computing a coherent cross power for each temporally aligned subset, said coherent cross power being computed from the product of said cross-spectra power and said coherence of each temporally aligned subset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer program product comprising a computer useable medium having computer readable program code functions embedded in said medium for causing a computer to assess sleep quality, comprising:
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a first computer readable program code function that causes the computer to access a first series of physiological data representing respiration dynamics of the subject; a second computer readable program code function that causes the computer to access a second series of physiological data representing heart rate dynamics of the subject, said second series being temporally aligned with said first series; and a third computer readable program code function that causes the computer to detect cardiopulmonary coupling between said first series and said second series by determining a cross-spectra power and a coherence for a plurality of temporally aligned subsets of data from said first series and said second series, and computing a coherent cross power for each temporally aligned subset, said coherent cross power being computed from the product of said cross-spectra power and said coherence of each temporally aligned subset. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of assessing sleep quality, comprising:
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accessing a first series of physiological data representing respiration data of the subject; accessing a second series of physiological data representing cardiac data of the subject; and determining cardiopulmonary coupling between the first and second series by calculating a coherent cross power between the first and second series, wherein the coherent cross power is calculated by computing a product of a cross-spectra power and a coherence calculation of the first and second series. - View Dependent Claims (20, 21, 22)
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23. A computer program product comprising a computer useable medium having computer readable program code functions embedded in said medium for causing a computer to assess sleep quality, comprising:
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a first computer readable program code function that causes the computer to access a first series of physiological data representing respiration data of the subject; a second computer readable program code function that causes the computer to access a second series of physiological data representing cardiac data of the subject; and a third computer readable program code function that causes the computer to determine cardiopulmonary coupling between the first and second series by calculating a coherent cross power between the first and second series, wherein the coherent cross power is calculated by computing a product of a cross-spectra power and a coherence calculation of the first and second series.
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24. A method of assessing sleep quality, comprising:
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accessing a first series of physiological data representing respiration dynamics of the subject; accessing a second series of physiological data representing heart rate dynamics of the subject, said second series being temporally aligned with said first series; detecting cardiopulmonary coupling between said first series and said second series; and comparing said cardiopulmonary coupling with a detection threshold for determining cyclic alternating pattern (CAP) activity, non-CAP activity, wake activity, or REM activity.
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Specification