Paul S. Addison,James Watson,James Ochs,Scott McGonigle
申请号：
US13229458
公开号：
US20130066174A1
申请日:
2011.09.09
申请国别(地区):
US
年份:
2013
代理人:
摘要：
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 subjects 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.
