SYSTEM FOR ANALYZING OXIMETRY DATA
First Claim
1. A method of diagnosing disordered breathing from a pleth signal:
- recording a pleth signal including a heart rate that varies over time;
using said variation in heart rate to identify a time based respiratory pattern that is recorded as a continuous waveform;
identifying attenuations in said pleth signal as arousal events and recording a time of each arousal event;
subtracting a time constant from the time related to each arousal event to determine a delay time related to each arousal event;
reviewing said respiratory pattern at each of said delay times to determine if there are changes in said respiratory pattern corresponding to each of said arousal events; and
recording each of said arousal events that correlate with changes in said respiratory pattern.
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Abstract
A method and system for the analysis of a patient'"'"'s oximetry data to detect sleep-disordered breathing is provided. The system employs an algorithm to reliably detect patient arousals and correlate those with accelerated heart rate and oxygen saturation levels in a manner that detects sleep-disordered breathing via the respiratory mask. Initially a timing channel is formed based on a plethsmography signal using an optical finger sensor. Based on the pleth waveform, a respiratory wave form is prepared that represents respiration rate. An arousal mask is applied to the signal based on attenuations in the pleth signal. Once arousals are identified the time required for changes to propagate from the lungs to the blood gas is subtracted from the onset time of the arousal. As a result if the timing agrees with dropping oxygen saturation or falling arterial pH then the arousal is indicated as a chemoreflex related arousal.
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Citations
16 Claims
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1. A method of diagnosing disordered breathing from a pleth signal:
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recording a pleth signal including a heart rate that varies over time; using said variation in heart rate to identify a time based respiratory pattern that is recorded as a continuous waveform; identifying attenuations in said pleth signal as arousal events and recording a time of each arousal event; subtracting a time constant from the time related to each arousal event to determine a delay time related to each arousal event; reviewing said respiratory pattern at each of said delay times to determine if there are changes in said respiratory pattern corresponding to each of said arousal events; and recording each of said arousal events that correlate with changes in said respiratory pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of diagnosing disordered breathing:
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recording a pleth signal using a pulse oximeter, said pleth signal including a heart rate that varies over time; using said variation in heart rate to identify a time based respiratory pattern that is recorded as a continuous waveform; identifying attenuations in said pleth signal as arousal events and recording a time of each arousal event; subtracting a time constant that represents the time delay between actually taking a breath and the actual registering of a change in blood gasses at carotid sensors from the recorded time of each arousal event to determine a delay time related to each arousal event; reviewing said respiratory pattern at each of said delay times to determine if there are changes in said respiratory pattern corresponding to each of said arousal events; and recording each of said arousal events that correlate with changes in said respiratory pattern. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification