Method and apparatus for detection of venous air emboli
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United States of America Patent
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Jul 9, 1996
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N/A
app pub date -
Mar 18, 1994
filing date -
Mar 18, 1994
priority date (Note) -
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Abstract
Concomitant measurement of EtCO.sub.2, EtN.sub.2 and (FiO.sub.2 -FeO.sub.2) 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 EtCO.sub.2 concentration of 1.5 mm Hg; 2) an increase in the FeN.sub.2 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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