Method and apparatus for monitoring cardio-pulmonary health
First Claim
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1. A cardio-pulmonary health monitoring apparatus comprising:
- a contactless motion sensor configured to generate one or more movement signals representing bodily movement of a patient during a monitoring session;
a processor; and
a memory storing program instructions configured to cause the processor to carry out a method of processing the one or more movement signals, the method comprising;
selecting one or more sections of the one or more movement signals, being sections during which the patient was asleep and not performing gross bodily movements,extracting one or more sleep disordered breathing (SDB) features from said sections of the one or more movement signals, andpredicting whether a clinical event is likely to occur during a predetermined prediction horizon based on the one or more SDB features,wherein the selecting comprises selecting one or more sections of good quality, andwherein sections of good quality comprise sections in which a figure of merit for the movement signal over the section exceeds a noise threshold for the section, andwherein the noise threshold for the section is the smaller of a maximum noise value for the motion sensor and a percentile of a distribution of root mean square (RMS) values of the movement signal over the section.
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Abstract
Disclosed is a cardio-pulmonary health monitoring apparatus. The apparatus comprises a contactless motion sensor configured to generate one or more movement signals representing bodily movement of a patient during a monitoring session; a processor; and a memory storing program instructions configured to cause the processor to carry out a method of processing the one or more movement signals. The method comprises extracting one or more sleep disordered breathing features from the one or more movement signals, and predicting whether a clinical event is likely to occur during a predetermined prediction horizon based on the one or more sleep disordered breathing features.
49 Citations
64 Claims
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1. A cardio-pulmonary health monitoring apparatus comprising:
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a contactless motion sensor configured to generate one or more movement signals representing bodily movement of a patient during a monitoring session; a processor; and a memory storing program instructions configured to cause the processor to carry out a method of processing the one or more movement signals, the method comprising; selecting one or more sections of the one or more movement signals, being sections during which the patient was asleep and not performing gross bodily movements, extracting one or more sleep disordered breathing (SDB) features from said sections of the one or more movement signals, and predicting whether a clinical event is likely to occur during a predetermined prediction horizon based on the one or more SDB features, wherein the selecting comprises selecting one or more sections of good quality, and wherein sections of good quality comprise sections in which a figure of merit for the movement signal over the section exceeds a noise threshold for the section, and wherein the noise threshold for the section is the smaller of a maximum noise value for the motion sensor and a percentile of a distribution of root mean square (RMS) values of the movement signal over the section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A cardio-pulmonary health monitoring apparatus comprising:
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a contactless sensor unit comprising a contactless motion sensor configured to generate one or more movement signals representing bodily movement of a patient during a monitoring session, a processor, and a memory storing program instructions configured to cause the processor to carry out a method of processing the one or more movement signals, the method comprising; selecting one or more sections of the one or more movement signals, being sections during which the patient was asleep and not performing gross bodily movements, computing a correlation feature by correlating a respiratory effort envelope of each selected section of the movement signals with one or more respiratory effort templates, detecting a sleep disordered breathing (SDB) event whenever the correlation feature exceeds a first threshold for a duration that is greater than a second threshold, and calculating one or more SDB features from the detected SDB events, the SDB features being indicative of severity of sleep-disordered breathing by the patient during the monitoring session. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of monitoring cardio-pulmonary health of a patient, the method comprising:
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selecting one or more sections of one or more movement signals representing bodily movement of the patient, the movement signals being generated by a contactless motion sensor directed at the patient during a monitoring session, the selected sections being sections during which the patient was asleep and not performing gross bodily movements, extracting one or more sleep disordered breathing (SDB) features from said sections of the one or more movement signals, and predicting whether a clinical event is likely to occur during a predetermined prediction horizon based on the one or more SDB features, wherein the selecting comprises selecting one or more sections of good quality, and wherein sections of good quality comprise sections in which a figure of merit for the movement signal over the section exceeds a noise threshold for the section, and wherein the noise threshold for the section is the smaller of a maximum noise value for the motion sensor and a percentile of a distribution of root mean square (RMS) values of the movement signal over the section. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method of monitoring cardio-pulmonary health of a patient, the method comprising:
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selecting one or more sections of one or more movement signals representing bodily movement of the patient, the movement signals being generated by a contactless motion sensor directed at the patient during a monitoring session, the selected sections being sections during which the patient was asleep and not performing gross bodily movements, extracting one or more sleep disordered breathing (SDB) features from said sections of the one or more movement signals, and predicting whether a clinical event is likely to occur during a predetermined prediction horizon based on the one or more SDB features, wherein said sections in which the patient was asleep comprise epochs labelled by a linear discriminant analysis (LDA) classifier as asleep, wherein the LDA classifier is configured to label each epoch based on an activity count series and a movement flag series for the epoch, and wherein the movement flag series is obtained by; computing a noise feature, a correlation feature, and a power feature for each sample of the movement signal; and setting a movement flag for each sample to true if a noise feature for the sample is above a high threshold and the corresponding correlation and power features are below a low threshold, otherwise setting the movement flag to false. - View Dependent Claims (43, 44)
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45. A method of monitoring cardio-pulmonary health of a patient, the method comprising:
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selecting one or more sections of one or more movement signals representing bodily movement of the patient, the movement signals being generated by a contactless motion sensor directed at the patient during a monitoring session, the selected sections being sections during which the patient was asleep and not performing gross bodily movements, and computing a correlation feature by correlating a respiratory effort envelope of each said selected section of the movement signals with one or more respiratory effort templates, detecting a sleep disordered breathing (SDB) event whenever the correlation feature exceeds a first threshold for a duration that is greater than a second threshold, and calculating one or more SDB features from the detected SDB events, the SDB features being indicative of severity of sleep-disordered breathing by the patient during the monitoring session. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A computer-readable medium storing program instructions configured to cause a processor to carry out a method of monitoring cardio-pulmonary health of a patient, the method comprising:
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selecting one or more sections of one or more movement signals representing bodily movement of the patient, the movement signals being generated by a contactless motion sensor directed at the patient during a monitoring session, the selected sections being sections during which the patient was asleep and not performing gross bodily movements, and computing a correlation feature by correlating a respiratory effort envelope of each said selected section of the movement signals with one or more respiratory effort templates, detecting a sleep disordered breathing (SDB) event whenever the correlation feature exceeds a first threshold for a duration that is greater than a second threshold, and calculating one or more sleep disordered breathing features from the detected SDB events, the SDB features being indicative of severity of sleep-disordered breathing by the patient during the monitoring session.
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Specification