Issue |
J Extra Corpor Technol
Volume 24, Number 3, September 1992
|
|
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Page(s) | 86 - 89 | |
DOI | https://doi.org/10.1051/ject/199224386 | |
Published online | 21 August 2023 |
Original Article
Prediction of Post-Cardiopulmonary Bypass Cardiac Output by Venous Oximetry
Department of Anesthesiology and Department of Epidemiology and Biostatistics - American University of Beirut, and the Electronics and Communication Department, Faculty of Engineering - Cairo University.
* Address correspondence to: Anis Baraka, MD Professor and Chairman Department of Anesthesiology American University of Beirut Beirut, Lebanon
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 (SVO2), while the second equation is based on the relationship with oxygen extraction (1 - SVO2). Each patient served as his own control. During bypass, when the patients were normothermic and perfused with a pump flow of 2.4 L/min/m2, the SVO2 was monitored by an in-line Bentley oxystat Meter. Just before termination of bypass, the pump flow was decreased to 0.4 L/min/m2 and the left atrial pressure was increased to 10-15 mmHg; the resulting SVO2 was recorded. The post-bypass CO was predicted in every patient by the two equations. 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.
Key words: cardiopulmonary bypass / cardiac output / mixed venous oxygen saturation / oxygen extraction
© 1992 AMSECT
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