Methods, systems and devices for monitoring respiratory disorders
First Claim
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1. A method of monitoring respiration comprising:
- obtaining a photoplethysmography (PPG) signal that is representative of blood volume;
determining an average of the PPG signal;
adding an offset to the average to produce a first threshold;
subtracting the offset from the average to produce a second threshold; and
monitoring respiratory rate by determining a number of transitions from one of the first and second thresholds to another of the first and second thresholds.
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Abstract
Methods, systems and devices are provided for monitoring respiratory disorders based on monitored factors of a photoplethysmography (PPG) signal that is representative of peripheral blood volume. The monitored factors can be respiratory effort as well as respiratory rate and/or blood oxygen saturation level. The systems and devices may or may not be implanted in a patient.
43 Citations
18 Claims
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1. A method of monitoring respiration comprising:
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obtaining a photoplethysmography (PPG) signal that is representative of blood volume; determining an average of the PPG signal; adding an offset to the average to produce a first threshold; subtracting the offset from the average to produce a second threshold; and monitoring respiratory rate by determining a number of transitions from one of the first and second thresholds to another of the first and second thresholds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of detecting episodes of sleep apnea, and distinguishing between hypopnea, obstructive sleep apnea (OSA) and central sleep apnea (CSA), said method comprising:
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obtaining a photoplethysmography (PPG) signal that is representative of a patient'"'"'s peripheral blood volume; monitoring respiratory effort and respiratory rate based on the PPG signal; detecting an episode of sleep apnea based on at least one of the respiratory effort and respiratory rate that are monitored; and distinguishing between hypopnea, OSA and CSA, for a detected episode of sleep apnea, based on the respiratory effort and respiratory rate. - View Dependent Claims (16, 17, 18)
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Specification