Physiological assessment system
First Claim
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1. A physiological assessment system comprising:
- a sensor adapted to transmit optical radiation of at least two wavelengths into a tissue site and generate a detector signal responsive to said optical radiation after absorption by pulsatile blood flow within said tissue site;
a pulse oximeter configured to derive a perfusion index from said signal; and
a second processor configured to analyze nonlinear dynamics of said perfusion index and to provide an illness severity indicator indicating at least a readily identifiable normal or abnormal state.
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Abstract
A physiological assessment system comprises a sensor and first and second processors. The sensor is adapted to generate a signal responsive to a living organism. The first processor is configured to derive a measured parameter from the sensor signal. The second processor is configured to analyze nonlinear dynamics of the measured parameter so as to provide a physiological assessment of the living organism.
864 Citations
17 Claims
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1. A physiological assessment system comprising:
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a sensor adapted to transmit optical radiation of at least two wavelengths into a tissue site and generate a detector signal responsive to said optical radiation after absorption by pulsatile blood flow within said tissue site; a pulse oximeter configured to derive a perfusion index from said signal; and a second processor configured to analyze nonlinear dynamics of said perfusion index and to provide an illness severity indicator indicating at least a readily identifiable normal or abnormal state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A physiological assessment system comprising:
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a pulse oximeter adapted to measure a perfusion index; an analyzer configured to provide at least one statistic responsive to variability of said perfusion index; and an interpreter configured to indicate illness severity based upon said at least one statistic. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A physiological assessment method comprising the steps of:
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deriving time series data for at least one physiological parameter comprising the substep of measuring perfusion index with a pulse oximeter; calculating a nonlinear dynamics measure based upon said time series data; evaluating said nonlinear dynamics measure with respect to a predetermined criterion; and providing an illness severity indicator indicating at least a readily identifiable normal or abnormal state based upon said evaluation. - View Dependent Claims (14, 15, 16, 17)
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Specification