System and method for determining stroke volume of a patient
First Claim
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1. A photoplethysmogram (PPG) system for determining a stroke volume of a patient, the PPG system comprising:
- a PPG sensor configured to be secured to a skin surface of the patient, wherein the PPG sensor comprises a probe comprising;
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, wherein the detected amount of the light corresponds to a physiological characteristic of the patient; and
a monitor operatively connected to the PPG sensor to receive a PPG signal from the PPG sensor, wherein the PPG signal comprises a primary peak separated from a trailing peak by a dichrotic notch, and wherein the monitor comprises a processor configured to measure an inverse gradient of an upslope of the primary peak of the PPG signal, and wherein the processor determines a stroke volume based at least in part on the inverse gradient 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
22 Claims
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1. A photoplethysmogram (PPG) system for determining a stroke volume of a patient, the PPG system comprising:
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a PPG sensor configured to be secured to a skin surface of the patient, wherein the PPG sensor comprises a probe comprising; 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, wherein the detected amount of the light corresponds to a physiological characteristic of the patient; and a monitor operatively connected to the PPG sensor to receive a PPG signal from the PPG sensor, wherein the PPG signal comprises a primary peak separated from a trailing peak by a dichrotic notch, and wherein the monitor comprises a processor configured to measure an inverse gradient of an upslope of the primary peak of the PPG signal, and wherein the processor determines a stroke volume based at least in part on the inverse gradient of the PPG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19, 20, 21, 22)
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13. A medical system, comprising:
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a photoplethysmogram (PPG) sensor configured to be secured to a skin surface of the patient, wherein the PPG sensor comprises one or more light sources configured to emit light into a tissue, and wherein the PPG sensor comprises one or more detectors configured to detect an amount of the light from the tissue; and a monitor operatively connected to the PPG sensor to receive a PPG signal from the PPG sensor, wherein the monitor comprises; an electrical input configured to receive the PPG signal, wherein the PPG signal comprises a primary peak; a processor electrically coupled to the electrical input and to a memory storing instructions for performing the functions of; calculating a heart rate based on a frequency of or a time interval between primary peaks in the PPG signal; determining an inverse gradient of an upstroke of the primary peak of the PPG signal; and calculating a stroke volume based at least in part on the inverse gradient; and a display graphically displaying an indication of the stroke volume. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification