Plethysmograph variability processor
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United States of America Patent
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Apr 9, 2013
Grant Date -
Aug 7, 2008
app pub date -
Dec 7, 2007
filing date -
Dec 9, 2006
priority date (Note) -
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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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