PERFUSION INDEX SMOOTHER
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Abstract
An embodiment of the present disclosure seeks to smooth a perfusion index measurement through use of a baseline perfusion index measurement and/or through the use of multiple PI calculations. The combination of the baseline perfusion index measurement reduces an error between a calculated measurement of PI and actual conditions.
63 Citations
19 Claims
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1. (canceled)
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2. A method of determining an indication of a physiological condition using data responsive to intensity signals acquired from a detector capable of detecting light attenuated by body tissue, the method comprising:
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determining one or more indications of pulse information from data responsive to intensity signals acquired from a detector capable of detecting light attenuated by body tissue; determining a first indication of amplitude data for a pulse based on the one or more indications of pulse information; determining a second indication of amplitude data for a combination of pulses based on the one or more indications of pulse information; determining a final indication of amplitude data based on the first and second indications, wherein the determining a final indication comprises selecting a lowest indication of amplitude from the first and second indications, averaging the first and second indications of amplitude, or using a statistical analysis of the first and second indications of amplitude; and outputting the final indication as an indication of perfusion index. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining an indication of perfusion index in a patient monitor, the method comprising:
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receiving pleth data; calculating at least two indications of perfusion index using at least two different calculation techniques; and determining a final indication of perfusion index based on the at least two indications of perfusion index, the final indication determined based on a signal quality, the lowest determined value of the at least two indications of perfusion index, an average of the at least two indications of perfusion index or a statistical analysis of the at least two indications of perfusion index - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification