SYSTEM AND METHOD FOR DETECTING VENTILATORY INSTABILITY
First Claim
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1. A method for automated detection of ventilatory instability, comprising:
- calculating an output value of breathes per minute for a data segment based at least in part upon signals of an airflow channel, a chest channel, and/or an abdomen channel and/or combinations thereof;
determining a baseline value for each of the airflow channel, the chest channel, and the abdomen channel based at least in part upon the output value of breathes per minute and/or a measure of the magnitude of the corresponding signals;
determining whether a reduction in airflow above a minimum reduction level relative to the baseline value for the airflow channel has been maintained for a period of time, and identifying a reduction in airflow event if the reduction in airflow is above the minimum reduction level; and
providing an indication of ventilatory instability if the reduction in airflow event is identified and meets a set of criteria.
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Abstract
Embodiments described herein may include systems and methods for detecting events that may be associated with sleep apnea. Some embodiments are directed to a system and/or method for automated detection of reduction in airflow events using polysomnograph signals, wherein the reduction in airflow events may relate to sleep apnea. The PSG signals may be limited to four signals, including data from an airflow channel, a blood oxygen saturation channel, a chest movement channel, and an abdomen movement channel. Using information from these channels, some embodiments may automatically identify reduction in airflow events.
6 Citations
33 Claims
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1. A method for automated detection of ventilatory instability, comprising:
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calculating an output value of breathes per minute for a data segment based at least in part upon signals of an airflow channel, a chest channel, and/or an abdomen channel and/or combinations thereof; determining a baseline value for each of the airflow channel, the chest channel, and the abdomen channel based at least in part upon the output value of breathes per minute and/or a measure of the magnitude of the corresponding signals; determining whether a reduction in airflow above a minimum reduction level relative to the baseline value for the airflow channel has been maintained for a period of time, and identifying a reduction in airflow event if the reduction in airflow is above the minimum reduction level; and providing an indication of ventilatory instability if the reduction in airflow event is identified and meets a set of criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 26, 27)
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13-25. -25. (canceled)
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28. A method, comprising:
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supplying signals of an airflow channel, a chest channel, an abdomen channel, and a pulse oximetry channel; calculating a baseline value for each of the airflow channel, the chest channel, and the abdomen channel based at least in part upon a value of breaths per minute and a measure of the magnitude of the corresponding signals; identifying a reduction in airflow event when a reduction in airflow above a minimum reduction level relative to the baseline value for the airflow channel has been maintained for a threshold period of time; determining if the reduction in airflow event is qualified by determining whether a specified amount of change has occurred in the chest channel, the abdomen channel, or the pulse oximetry channel during a window of time including the reduction in airflow event; identifying ventilatory instability based at least in part upon a series of blood oxygen saturation values; and comparing results from the event detection system and the pulse oximetry pattern recognition system to facilitate adjustment of the pulse oximetry pattern recognition system. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification