The Journal of extra-corporeal technology
-
The purpose of this study was to evaluate the utility of the Cobe SAT/HCT Monitor, an in-line device which continuously displays hematocrit and venous oxygen saturation. A fiber optic cable was used to connect the monitor to a "window" on the blood inlet of a venous reservoir (Cobe CML). ⋯ Results showed a high degree of correlation between the monitor and control values for both venous saturation (r = .96) and for hematocrit (r = .94). Although this device has some minor deficiencies, it is a useful tool which enables the perfusionist to monitor two important components of oxygen consumption.
-
J Extra Corpor Technol · Jan 1992
Prediction of post-cardiopulmonary bypass cardiac output by venous oximetry.
The present study evaluates two equations for predicting the post-cardiopulmonary bypass cardiac output (CO) in 10 patients undergoing coronary artery bypass grafting. One equation is based on the relationship of CO with mixed venous oxygen saturation (SVO 2), while the second equation is based on the relationship with oxygen extraction (1 - SVO 2). Each patient served as his own control. ⋯ Immediately after weaning from bypass, the cardiac output was measured by thermodilution. The thermodilutional CO measurement was correlated with the CO predicted by the two equations. Correlation analysis suggests that CO prediction is more accurate and approaches the 1:1 ratio when the calculation of predicted CO is based on the relationship between cardiac output and oxygen extraction.
-
J Extra Corpor Technol · Jan 1990
Clinical accuracy of continuous hemoglobin oxygen saturation monitoring devices.
Three devices used to measure hemoglobin oxygen saturation in the extracorporeal circuit were studied and compared to a control. The Baxter Bentley OxySat, Oximetrix Accusat, and Radiometer ABL4 blood gas monitor were compared to a control, the IL 282 Co-Oximeter. ⋯ The Accusat was found to be a statistically more accurate means of monitoring hemoglobin oxygen saturations during cardiopulmonary bypass than the ABL4 and the OxySat. All devices had significant correlation with the control and with each other.