Implications of Altered Hemoglobin Concentration with Variations in Oxygen Consumption, Arterial Oxygen Saturation, and Age Based on a Mathematical Model for the Utilization of Reserve Oxygen Transport Capacity
The optimal hemoglobin concentration in critically ill patients has remained controversial with levels from 10 to 15 grams % being recommended.1,2,3,4 with this in mind a previously described mathematical model for the percent utilization of reserve oxygen transport* capacity (% URO2TC)5 was used to examine the interrelationships of hemoglobin concentration, cardiac output, oxygen consumption (V̇O2), arterial oxygen saturation (SaO2), and age with the % URO2TC. The model is a set of five equations that interrelate two sets of values for oxygen delivery (DO2) and VO2 with the % URO2TC.
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