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System for measuring blood oxygen levels

  • US 5,634,461 A
  • Filed: 06/07/1995
  • Issued: 06/03/1997
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Fees
First Claim
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1. A method for determining mixed venous blood oxygen tension (PvO2) of a patient in real-time, comprising the steps of:

  • storing constant values corresponding to blood volume, oxygen solubility in plasma and oxygen content of a desired unit of saturated oxyhemoglobin of a patient into a first computer memory;

    measuring cardiac output values (CO) of a patient in real-time, wherein said cardiac output values are saved to a second computer memory;

    storing a value corresponding to whole body oxygen consumption (VO2) of said patient into a third computer memory;

    determining arterial oxygen content (CaO2) of said patient using numerical values corresponding to hemoglobin concentration, arterial tension of oxygen (PaO2), arterial tension of carbon dioxide (CO2), arterial pH and body temperature wherein said values are obtained contemporaneously with said measurement of cardiac output levels; and

    calculating the mixed venous blood oxygen tension (PvO2) of a patient in real-time.

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