Fig. 2
From: Alternative blood transfusion triggers: a narrative review
Relationship between delivery and consumption of oxygen. There is an increase in the level of lactate and a further increase in oxygen extraction with a decrease in the saturation of hemoglobin in venous blood when reaching the critical oxygen delivery (DO2- oxygen delivery, VO2- oxygen consumption, SvO2-saturation of hemoglobin in mixed/central venous blood, OER-oxygen extraction ratio, DO2crit- critical level of oxygen delivery)(With the permission from Elsevier Publisher, License Number 5,633,500,709,980) [64]