Plethysmograph variability processor
AssigneeMasimo Corporation
InventorsAmmar Al-Ali, Walter M. Weber, Anmol B. Majmudar
Life of this patent
Estimating the term…
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.
Claims20
A method of determining an efficacy of a treatment that includes administering a substance to a patient, the method comprising:
- receiving a data signal from a physiological sensor during the treatment;
- 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 the patient;
- determining a first plurality of perfusion parameters, wherein each 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 corresponding 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 to identify a variability trend;
- and
- based at least in part on the variability trend, causing a display device to display an indication of the efficacy of the treatment.
A patient monitor configured to determine an efficacy of a treatment that includes administering a substance to a patient, the patient monitor comprising:
- one or more processors configured to:
- receive a data signal from a physiological sensor during the treatment;
- 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 the patient;
- determine a first plurality of perfusion parameters, wherein each 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 corresponding 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 to identify a variability trend;
- and
- based at least in part on the variability trend, cause a display device to display an indication of the efficacy of the treatment.
Dependencies are inferred from the claim text.