Detection of ventilation sufficiency
First Claim
1. A method for controlling a processor to assess sufficiency of ventilation from a measured flow of breathable gas, the method comprising:
- measuring, by way of a sensor, a flow of breathable gas representative of patient respiration;
deriving measures of ventilation from the measure of flow;
determining, with a processor, a histogram including the measures of ventilation, wherein the measures are volumes of breathable gas measured over a time interval; and
evaluating the histogram in the processor and, based on the evaluation, outputting an indication of occurrence of hypoventilation.
2 Assignments
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Accused Products
Abstract
Automated methods provide a ventilation sufficiency assessment to evaluate patient respiration. In some embodiments, a ventilation histogram maybe determined from a measure of patient respiratory flow. Based on the histogram or associated ventilation data, hypoventilation or hyperventilation occurrences may be detected. For example, a kurtosis index and/or skewness index may be calculated with the data associated with the ventilation histogram and may be evaluated as an indication of hypoventilation or hyperventilation. An assessment of the number of peaks and other features of the ventilation histogram, such as in the case of a bimodal ventilation histogram, may be implemented to detect an occurrence of ventilation insufficiency or sufficiency. The detection methodologies may be implemented by a specific purpose computer, a detection device that measures a respiratory airflow or a respiratory treatment apparatus that provides a respiratory treatment regime based on the detected ventilation sufficiency.
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Citations
62 Claims
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1. A method for controlling a processor to assess sufficiency of ventilation from a measured flow of breathable gas, the method comprising:
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measuring, by way of a sensor, a flow of breathable gas representative of patient respiration; deriving measures of ventilation from the measure of flow; determining, with a processor, a histogram including the measures of ventilation, wherein the measures are volumes of breathable gas measured over a time interval; and evaluating the histogram in the processor and, based on the evaluation, outputting an indication of occurrence of hypoventilation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for controlling a processor to assess sufficiency of ventilation from a measured flow of breathable gas, the method comprising:
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measuring, by way of a sensor, a flow of breathable gas representative of patient respiration; deriving measures of ventilation from the measure of flow; determining, with a processor, a histogram including the measures of ventilation, wherein the measures are volumes of breathable gas measured over a time interval; and evaluating the histogram in the processor and, based on the evaluation, outputting an indication of occurrence of hyperventilation, wherein the method comprises; processing, in the processor, data associated with the histogram to calculate a skewness index; comparing the skewness index to a threshold, and indicating hyperventilation based on the comparison.
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23. A ventilation assessment apparatus comprising:
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a flow sensor configured to measure a flow of breathable gas, and a controller having at least one processor to access data representing a measured flow of breathable gas attributable to patient respiration obtained from the flow sensor, the controller being further configured to (a) control measuring of the flow of breathable gas with the flow sensor, (b) derive measures of ventilation from the measure of flow, (c) determine a histogram of the measures of ventilation, wherein the measures are volumes of breathable gas measured over a time interval and (d) evaluate the histogram in the processor and, based on the evaluation, output an indication of occurrence of hypoventilation. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A ventilation assessment apparatus comprising:
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a flow sensor configured to measure a flow of breathable gas, and a controller having at least one processor to access data representing a measured flow of breathable gas attributable to patient respiration obtained from the flow sensor, the controller being further configured to (a) control measuring of the flow of breathable gas with the flow sensor, (b) derive measures of ventilation from the measure of flow, (c) determine a histogram of the measures of ventilation, wherein the measures are volumes of breathable gas measured over a time interval and (d) evaluate the histogram in the processor and, based on the evaluation, output an indication of occurrence of hyperventilation, wherein the controller is configured to; process data associated with the histogram to calculate a skewness index; compare the skewness index to a threshold; and indicate an occurrence of hyperventilation based on the comparison.
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45. A ventilation assessment system comprising:
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means for measuring a flow of breathable gas attributable to patient respiration during a treatment session, means for deriving measures of ventilation from the measure of flow, means for determining a histogram with the measures of ventilation, wherein the measures are volumes of breathable gas measured over a time interval, and means for evaluating the histogram in a processor and, based on the evaluation, outputting an indication of occurrence of hypoventilation. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification