System and method for determining stroke volume of a patient
First Claim
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1. A method, comprising:
- receiving a photoplethysmogram (PPG) signal from a single PPG sensor at a PPG monitor comprising a processor, wherein the PPG sensor is configured to be secured to a skin surface of a patient, and wherein the PPG sensor comprises one or more light sources configured to emit light into a tissue and one or more detectors configured to detect an amount of the light from the tissue, and wherein the PPG signal comprises a primary peak separated from a trailing peak by a dichrotic notch;
analyzing the PPG signal via the processor to determine an inverse gradient of an upslope of the primary peak of the PPG signal; and
calculating a stroke volume via the processor based on the inverse gradient of the upslope of the primary peak of the PPG signal.
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Abstract
A PPG system for determining a stroke volume of a patient includes a PPG sensor configured to be secured to an anatomical portion of the patient. The PPG sensor is configured to sense a physiological characteristic of the patient. The PPG system may include a monitor operatively connected to the PPG sensor. The monitor receives a PPG signal from the PPG sensor. The monitor includes a pulse trending module determining a slope transit time of an upslope of a primary peak of the PPG signal. The pulse trending module determines a stroke volume of the patient as a function of the slope transit time.
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Citations
18 Claims
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1. A method, comprising:
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receiving a photoplethysmogram (PPG) signal from a single PPG sensor at a PPG monitor comprising a processor, wherein the PPG sensor is configured to be secured to a skin surface of a patient, and wherein the PPG sensor comprises one or more light sources configured to emit light into a tissue and one or more detectors configured to detect an amount of the light from the tissue, and wherein the PPG signal comprises a primary peak separated from a trailing peak by a dichrotic notch; analyzing the PPG signal via the processor to determine an inverse gradient of an upslope of the primary peak of the PPG signal; and calculating a stroke volume via the processor based on the inverse gradient of the upslope of the primary peak of the PPG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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receiving a photoplethysmogram (PPG) signal from a single PPG sensor at a PPG monitor comprising a processor, wherein the PPG sensor is configured to be secured to a skin surface of a patient, and wherein the PPG sensor comprises one or more light sources configured to emit light into a tissue and one or more detectors configured to detect an amount of the light from the tissue, and wherein the PPG signal comprises one or more primary peaks; calculating a heart rate based on a frequency of or a time interval between the one or more primary peaks in the PPG signal; determining an inverse gradient of an upstroke of a primary peak of the PPG signal; calculating a stroke volume based at least in part on the inverse gradient; calculating a cardiac output based at least in part on the stroke volume and the heart rate; and displaying the cardiac output, the stroke volume, the heart rate, or a combination thereof, on a display. - View Dependent Claims (16, 17, 18)
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Specification