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US 2003/0167016 A1Published application
Airway-based cardiac output monitor and methods for using same
OwnerJames R. Maultinventor
Life of this patent
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Abstract
A respiratory gas analyzer for measuring the cardiac output of a subject includes a flow meter and an oxygen sensor interconnected with one another between a mouthpiece and a source of respiratory gases which may be a controlled source or the atmosphere. An oximeter provides measurements of the oxygen saturation of the subject. A computer connected to receive the signals from the flow meter, oxygen sensor, and oximeter can then calculate the subject's cardiac output.
Claims10
An apparatus for determining a cardiac output of a subject, the apparatus comprising:
- a respiratory analyzer, having a flow path through which respiratory gases pass, a flow rate sensor, and an oxygen sensor, the respiratory analyzer providing a flow signal correlating with a flow rate of respiratory gases through the flow path, and a respiratory oxygen concentration signal correlating with an oxygen concentration of respiratory gases;
- and
- a computation unit, wherein said computation unit receives the respiratory oxygen concentration signal and the flow signal, the computation unit being operable to determine an oxygen consumption of the subject, to determine an end-tidal partial pressure of oxygen of at least one breath of the subject, and to determine the cardiac output of the subject using the oxygen consumption, the end-tidal partial pressure of oxygen, and an arterial oxygen saturation.
Dependencies are inferred from the claim text.