Method of measuring breathing resistance of a sleeping subject
First Claim
1. A method of determining a maximum apnea density index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
- selecting a set of respiratory events of the set of respiratory sounds;
determining a maximum apnea density index by identifying a time interval of predetermined duration within the set of respiratory events which has a maximum number of apnea events and determining the maximum apnea density index based upon the number of apnea events in that time interval.
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Accused Products
Abstract
The invention provides a method of determining a breathing resistance index of a sleeping subject from a set of respiratory sounds. The method includes the steps of selecting a first set of respiratory events of the set of respiratory sounds and manually determining a classification content of the first set of respiratory events. The method further includes extrapolating the classification content of the first set of respiratory events to an at least second set of respiratory events and determining a breathing resistance index based upon the classification content of the at least second set of respiratory events.
78 Citations
16 Claims
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1. A method of determining a maximum apnea density index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; determining a maximum apnea density index by identifying a time interval of predetermined duration within the set of respiratory events which has a maximum number of apnea events and determining the maximum apnea density index based upon the number of apnea events in that time interval.
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2. A method of determining a maximum hypoapnea density index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; identifying a time interval of predetermined duration within the set of respiratory events which has a maximum number of hypoapnea events, and determining the maximum hypopnea density index based upon the number of hypoapnea events in that time interval.
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3. A method of determining a qualitative breathing resistance index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; determining a classification content of the set of respiratory events; and determining a qualitative breathing resistance index based upon the classification content of at least a portion of the set of respiratory events including determining an average loudness for normal breathing events in the set of respiratory events, and the loudness of a specific event, and then calculating an absolute index based upon the average loudness and specific loudness. - View Dependent Claims (4, 5)
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6. A method of determining a qualitative breathing resistance index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; determining a classification content of the set of respiratory events including classifying at least some of the respiratory sounds of the set of respiratory events as high resistance respiratory events; and determining a qualitative breathing resistance index based upon the classification content of at least a portion of the set of respiratory events including calculating a ratio of the number of breaths involving high resistance to breathing to a sum of all breathing events.
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7. A method of determining a relative breathing resistance index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; determining a classification content of the set of respiratory events including classifying at least some of the respiratory sounds of the set of respiratory events as high resistance respiratory events and determining a total number of breathing events and a total number of the breathing events that are snoring events in the set of respiratory events; and determining the relative breathing resistance index based upon the total breathing events and total snoring events. - View Dependent Claims (8)
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9. A method of determining a respiratory disturance index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; determining a classification content of the set of respiratory events; and determining the respiratory disturbance index by summing all apnea events and all hypoapnea events occurring during a time-interval and determining the respiratory disturbance index based upon the sum.
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10. A method of determining a qualitative breathing resistance index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; determining a classification content of the set of respiratory events; determining a qualitative breathing resistance index based upon the classification content of at least a portion of the set of respiratory events; classifying at least some of the respiratory sounds of the set of respiratory events as high resistance respiratory events; and determining a percentage of snoring events dominated by a velum-like pattern by tabulating the snoring events of the classified respiratory event set characterized as velum-like;
dividing by the total number of snoring events in the respiratory event set; and
multiplying by one hundred. - View Dependent Claims (11)
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12. A method of determining a qualitative breathing resistance index of a sleeping subject from a set of respiratory sounds from the subject comprising the steps of:
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selecting a set of respiratory events of the set of respiratory sounds; determining a classification content of the set of respiratory events; determining a qualitative breathing resistance index based upon the classification content of at least a portion of the set of respiratory events; classifying at least some of the respiratory sounds of the set of respiratory events as high resistance respiratory events; and determining a percentage of breathing events having at least some velum-like patterns by tabulating breathing events classified as a velum snore;
dividing by the total number of breathing events in the respiratory event set; and
multiplying by one hundred. - View Dependent Claims (13, 14, 15, 16)
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Specification