Systems and methods for determining respiratory effort
First Claim
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1. A method for calculating a measure of respiratory effort of a subject, the method comprising:
- receiving two photoplethysmograph (PPG) signals corresponding to two different locations on the subject;
calculating, using electronic processing equipment, differential pulse transit time (DPTT) values for the two PPG signals, wherein the DPTT values represent differences in arrival times between the two locations;
determining, using the electronic processing equipment, a measure of respiratory effort based at least in part on the calculated DPTT values; and
storing, using a storage device, the measure of respiratory effort.
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Abstract
Systems and methods for calculating a measure of respiratory effort of a subject are provided. The measure of respiratory effort may be calculated based on a differential pulse transit time (DPTT) calculated for received photoplethysmograph signals. The systems and methods may allow for the calculation of respiratory effort in absolute units, and without the need for calibrations from a device that measures blood pressure (e.g., a non-invasive blood pressure cuff).
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Citations
19 Claims
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1. A method for calculating a measure of respiratory effort of a subject, the method comprising:
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receiving two photoplethysmograph (PPG) signals corresponding to two different locations on the subject; calculating, using electronic processing equipment, differential pulse transit time (DPTT) values for the two PPG signals, wherein the DPTT values represent differences in arrival times between the two locations; determining, using the electronic processing equipment, a measure of respiratory effort based at least in part on the calculated DPTT values; and storing, using a storage device, the measure of respiratory effort. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for calculating a measure of respiratory effort of a subject, comprising:
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an input for receiving two photoplethysmograph (PPG) signals corresponding to two different locations on the subject; a processor configured to use at least portions of the two PPG signals to; calculate differential pulse transit time (DPTT) values for the two PPG signals, wherein the DPTT values represent differences in arrival times between the two locations; and determine a measure of respiratory effort based at least in part on the calculated DPTT values; and a storage device for storing the measure of respiratory effort. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. Non-Transitory computer readable storage media comprising instructions for:
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receiving two photoplethysmograph (PPG) signals corresponding to two different locations on the subject; calculating differential pulse transit time (DPTT) values for the two PPG signals, wherein the DPTT values represent differences in arrival times between the two locations; determining a measure of respiratory effort based at least in part on the calculated DPTT values; and storing the measure of respiratory effort.
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Specification