PLETHYSMOGRAPH VARIABILITY PROCESSOR
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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
50 Claims
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1-30. -30. (canceled)
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31. A method of determining a respiratory condition and/or an efficacy of treatment for the respiratory condition, the method comprising:
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receiving a data signal from a physiological sensor; generating a plethysmograph waveform based at least in part on the data signal, wherein the plethysmograph waveform comprises a plurality of pulses corresponding to pulsatile blood flow within tissue of a patient; determining a first plurality of perfusion parameters, wherein a particular perfusion parameter of the first plurality of perfusion parameters is determined based at least in part on a peak amplitude and a valley amplitude of a particular pulse of the plurality of pulses; determining a first measure of variability of the first plurality of perfusion parameters based at least in part on a difference between a first and second perfusion parameter of the first plurality of perfusion parameters relative to the first perfusion parameter of the first plurality of perfusion parameters; comparing the first measure of variability of the first plurality of perfusion parameters with one or more second measures of variability of a second plurality of perfusion parameters; and based at least in part on the comparing, causing a display device to display an indication of at least one of one or more respiratory conditions or an efficacy of treatment for the one or more respiratory conditions. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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41. A patient monitor configured to determine a respiratory condition and/or an efficacy of treatment for the respiratory condition, the patient monitor comprising:
one or more processors configured to; receive a data signal from a physiological sensor; generate a plethysmograph waveform based at least in part on the data signal, wherein the plethysmograph waveform comprises a plurality of pulses corresponding to pulsatile blood flow within tissue of a patient; determine a first plurality of perfusion parameters, wherein a particular perfusion parameter of the first plurality of perfusion parameters is determined based at least in part on a peak amplitude and a valley amplitude of a particular pulse of the plurality of pulses; determine a first measure of variability of the first plurality of perfusion parameters based at least in part on a difference between a first and second perfusion parameter of the first plurality of perfusion parameters relative to the first perfusion parameter of the first plurality of perfusion parameters; compare the first measure of variability of the first plurality of perfusion parameters with one or more second measures of variability of a second plurality of perfusion parameters; and based at least in part on the comparison, cause a display device to display an indication of at least one of one or more respiratory conditions or an efficacy of treatment for the one or more respiratory conditions. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50)
Specification