System and method for generating an adjusted fluid responsiveness metric
First Claim
1. A medical monitor for monitoring a patient, comprising:
- a sensor port configured to receive a photoplethysmograph (PPG) signal representing light absorption by a patient'"'"'s tissue from a PPG sensor;
a processor configured to;
calculate a perfusion metric based on the PPG signal;
determine a perfusion status of the patient based on the perfusion metric, wherein the perfusion status is one of a low perfusion status and a good perfusion status;
calculate a fluid responsiveness predictor (FRP) value based on a respiratory variation of the PPG signal; and
apply a correction factor to the FRP value when the perfusion status is a low perfusion status; and
a display configured to display the corrected FRP value.
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Accused Products
Abstract
The present invention relates to physiological signal processing, and in particular to methods and systems for processing physiological signals to predict a fluid responsiveness of a patient. A medical monitor for monitoring a patient includes an input receiving a photoplethysmograph (PPG) signal representing light absorption by a patient'"'"'s tissue. The monitor also includes a perfusion status indicator indicating a perfusion status of the PPG signal, and a fluid responsiveness predictor (FRP) calculator programmed to calculate an FRP value based on a respiratory variation of the PPG signal. The FRP calculator applies a correction factor based on the perfusion status indicator.
21 Citations
17 Claims
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1. A medical monitor for monitoring a patient, comprising:
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a sensor port configured to receive a photoplethysmograph (PPG) signal representing light absorption by a patient'"'"'s tissue from a PPG sensor; a processor configured to; calculate a perfusion metric based on the PPG signal; determine a perfusion status of the patient based on the perfusion metric, wherein the perfusion status is one of a low perfusion status and a good perfusion status; calculate a fluid responsiveness predictor (FRP) value based on a respiratory variation of the PPG signal; and apply a correction factor to the FRP value when the perfusion status is a low perfusion status; and a display configured to display the corrected FRP value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical monitor for monitoring a patient, comprising:
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a sensor port configured to receive a photoplethysmography (PPG) signal responsive to light absorption by a patient'"'"'s tissue from a PPG sensor; a processor comprising a; a perfusion calculator configured to calculate a perfusion value based on the PPG signal; a fluid responsiveness calculator configured to calculate a fluid responsiveness value based on a respiratory variation of the PPG signal; and a scaling unit configured to determine that the perfusion value is below a threshold and calculate a scaled fluid responsiveness value based on the perfusion value when the perfusion value is below the threshold; and a display configured to display the scaled fluid responsiveness value. - View Dependent Claims (12, 13, 14, 15)
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16. A medical monitor for monitoring vital signs of a patient, comprising:
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a sensor port configured to receive a photoplethysmography (PPG) signal responsive to light absorption by a patient'"'"'s tissue from a PPG sensor, wherein the PPG signal comprises an AC signal portion and a baseline signal portion; a processor configured to; calculate a percent modulation of the PPG signal by comparing amplitude of the AC signal portion and amplitude of the baseline signal portion; calculate a fluid responsiveness value based on a respiratory variation of the PPG signal; and calculate a scaled fluid responsiveness value when the percent modulation is below a threshold; and a display configured to display the scaled fluid responsiveness value.
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17. A method for monitoring vital signs of a patient, the method comprising:
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receiving, using a sensor port of a medical monitor, a photoplethysmography (PPG) signal responsive to light absorption by a patient'"'"'s tissue from a PPG sensor, wherein the PPG signal comprises an AC signal portion and a baseline signal portion; calculating, using a processor of the medical monitor, a percent modulation of the PPG signal by comparing amplitude of the AC signal portion and amplitude of the baseline signal portion; calculating, using the processor of the medical monitor, a fluid responsiveness value based on a respiratory variation of the PPG signal; determining, using the processor of the medical monitor, that the percent modulation of the PPG signal is below a threshold; calculating, using the processor of the medical monitor, a scaled fluid responsiveness value, based on the percent modulation, in response to determining that the percent modulation is below the threshold; displaying, using a display of the medical monitor, the scaled fluid responsiveness value.
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Specification