Method and apparatus for metabolic monitoring

Details Method and apparatus for metabolic monitoring Method and apparatus for metabolic monitoring

A - Human Necessities

61

B

150/11, 354/22

A61B 5/083 (2006.01) G01N 33/497 (2006.01)

Patent

CA 2014338

A method and apparatus for measuring metabolic rates such as oxygen consumption and carbon dioxide elimination rates of a patient intubated on a ventilator. An inspiration sample of gases provided by the ventilator and end-tidal and ambient pressure samples of expiration gases exhaled by the patient are collected and analyzed to determined concentrations along with flow rate data are used to calculate the desired metabolic rates on a breath-by-breath flow weighted average basis. The ambient pressure sample is taken from a point prior to complete mixing of the gases exhaled in adjacent breaths and after the exhalation valve such that the pressure is essentially ambient room air pressure to facilitate accurate sychronization of the flow rate and concentra- tion signals.

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