PLETHYSMOGRAPH VARIABILITY PROCESSOR
First Claim
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1. A plethysmograph variability method comprising:
- receiving a plethysmograph waveform having pulses corresponding to pulsatile blood flow within a tissue site;
determining a plurality of perfusion values corresponding to the pulses, wherein determining the plurality of perfusion values comprises;
identifying peaks and valleys of the pulses, andcalculating differential values for the pulses from the peaks and the valleys of the pulses;
determining a plurality of variability values each indicative of the variability of a series of the perfusion values, wherein determining a variability value of the plurality of variability values includes calculating a difference between a first perfusion value of a series of perfusion values and a second perfusion value of the series of perfusion values;
determining a plethysmograph variability parameter representative of the plurality of variability values; and
causing a display device to display the plethysmograph variability parameter.
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Abstract
A plethysmograph variability processor inputs a plethysmograph waveform having pulses corresponding to pulsatile blood flow within a tissue site. The processor derives plethysmograph values based upon selected plethysmograph features, determines variability values, and calculates a plethysmograph variability parameter. The variability values indicate the variability of the plethysmograph features. The plethysmograph variability parameter is representative of the variability values and provides a useful indication of various physiological conditions and the efficacy of treatment for those conditions.
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Citations
20 Claims
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1. A plethysmograph variability method comprising:
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receiving a plethysmograph waveform having pulses corresponding to pulsatile blood flow within a tissue site; determining a plurality of perfusion values corresponding to the pulses, wherein determining the plurality of perfusion values comprises; identifying peaks and valleys of the pulses, and calculating differential values for the pulses from the peaks and the valleys of the pulses; determining a plurality of variability values each indicative of the variability of a series of the perfusion values, wherein determining a variability value of the plurality of variability values includes calculating a difference between a first perfusion value of a series of perfusion values and a second perfusion value of the series of perfusion values; determining a plethysmograph variability parameter representative of the plurality of variability values; and causing a display device to display the plethysmograph variability parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A plethysmograph variability system comprising:
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a processor in communication with one or more sensors that detect optical radiation after attenuation by pulsatile blood flowing within a tissue site, the processor configured to execute one or more instructions that cause the processor to; determine a plurality of perfusion values of pulses corresponding to the pulsatile blood flowing within the tissue site, wherein to determine the plurality of perfusion values the processor is further configured to; identify peaks and valleys of the pulses, and calculate differential values for the pulses from the peaks and the valleys of the pulses; determine a plurality of variability values indicative of the variability of a plurality of series of perfusion values, wherein to determine a variability value of the plurality of variability values the processor is further configured to calculate a difference between a first perfusion value of a series of perfusion values and a second perfusion value of the series of perfusion values; determine a plethysmograph variability parameter representative of the plurality of variability values; and cause a display to display the plethysmograph variability parameter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for determining a plethysmograph variability parameter, the method comprising:
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receiving a plethysmograph waveform having pulses corresponding to pulsatile blood flow within a tissue site; identifying relative minimums and relative maximums of the pulses; calculating differential values for the pulses from the identified relative minimums and relative maximums of the pulses to determine a plurality of perfusion values for the pulses, wherein the plurality of perfusion values comprise at least a first set of perfusion values and a second set of perfusion values; calculating a variability value of the first set of perfusion values using at least a difference between a first perfusion value of the first set of perfusion values and a second perfusion value of the first set of perfusion values; calculating a variability value of the second set of perfusion values using at least a difference between a first perfusion value of the second set of perfusion values and a second perfusion value of the second set of perfusion values; determining a plethysmograph variability parameter representative of at least the variability value of the first set of perfusion values and the variability value of the second set of perfusion values; and causing a display device to display the plethysmograph variability parameter. - View Dependent Claims (19, 20)
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Specification