Method and apparatus for detection of venous air emboli

Details Method and apparatus for detection of venous air emboli Method and apparatus for detection of venous air emboli

A - Human Necessities

61

B

A61B 5/083 (2006.01) A61B 5/14 (1995.01)

Patent

CA 2142076

Concomitant measurement of EtCO2, EtN2 and (FiO2- FeO2) concentrations are used to detect a VAE. In a respiratory gas monitoring system, continuous measurements of end-tidal carbon dioxide, end-tidal nitrogen and the difference between inspired and expired oxygen concentrations are averaged using a predetermined time period and stored as historical data. Periodically, a present value of each of these concentrations is compared to its respective historical average for a predetermined time period. If the following conditions are met, the device signals the presence of a venous air embolism: 1) a decrease in the EtCO2 concentration of 1.5 mm Hg; 2) an increase in the FeN2 concentration of 0.03 vol%; and 3) a decrease in the difference between the inspired oxygen concentration and the expired oxygen concentration of 0.20 vol%.

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