Oxygen Extraction Ratio: A Valid Indicator of Transfusion Need in Limited Coronary Vascular Reserve?
- 1 June 1992
- journal article
- Published by Wolters Kluwer Health
- Vol. 32 (6) , 769-774
- https://doi.org/10.1097/00005373-199206000-00018
Abstract
We have described whole body oxygen (O2) extraction ratio (ER) as a reliable indicator of transfusion need in acute normovolemic anemia. In normal hearts, myocardial lactate production (–LACT), indicating anaerobic metabolism, does not occur until the ER >50% and Hct 50% remains a valid indicator of myocardial metabolism in anemia in the presence of limited coronary vascular reserve. The ER may be a useful guide to transfusion therapy.Keywords
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