VENOUS OXYGEN SATURATION SYSTEMS AND METHODS
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United States of America Patent
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Issued Date -
Mar 14, 2013
app pub date -
Sep 9, 2011
filing date -
Sep 9, 2011
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Abstract
Methods and systems are discussed for determining venous oxygen saturation by calculating a ratio of ratios from respiration-induced baseline modulations. A calculated venous ratio of ratios may be compared with a look-up table value to estimate venous oxygen saturation. A calculated venous ratio of ratios is compared with an arterial ratio of ratios to determine whether baseline modulations are the result of a subject's respiration or movement. Such a determination is also made by deriving a venous ratio of ratios using a transform technique, such as a continuous wavelet transform. Derived venous and arterial saturation values are used to non-invasively determine a cardiac output of the subject.
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