A 75-year-old female has been critically ill with multiple organ dysfunction syndrome (MODS) for longer than a week and has developed a severe oxygen supply and demand imbalance
The statement that best describes this imbalance is which of the following?
a. Increased oxygen delivery to cells fails to meet decreased oxygen demands.
b. The amount of oxygen consumed by cells depends only on the needs of cells, be-cause there is oxygen in reserve.
c. The situation results in sup-ply-independent consumption.
d. The reserve has been exhausted, and the amount of oxygen consumed depends on the amount the circulation is able to deliv-er.
ANS: D
In MODS, the reserve has been exhausted and the body cannot meet the oxygenation demands. It is true that oxygen fails to meet demand, but there is no increase in oxygen because reserves are exhausted. There is no oxygen in reserve. The situation is supply and demand, but the de-mand cannot be met.
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