12 Questions
Which factor determines how much oxygen blood has the capacity to carry?
Saturation of Hb with O2
What is the significance of Po2 in blood?
Determines the oxygen content of arterial blood
What does SaO2 measure in blood?
Oxygen saturation in arterial blood
Why is pulse oximetry less accurate at saturations below 75%?
Due to poor peripheral perfusion
What does Po2 regulate in the context of O2 molecules binding to Hb?
Oxygen saturation (So2)
Why is the percentage of Hb saturated with O2 markedly reduced in CO poisoning?
Because CO has a higher affinity for Hb than O2.
Why is SaO2 reduced in CO poisoning even when PaO2 is high?
Because CO has a higher affinity for Hb than O2.
What effect does a higher Po2 have on So2 according to the text?
Increases it linearly
Why does SaO2 appear normal in CO poisoning according to the text?
Pulse oximeters cannot distinguish carboxyhaemoglobin from oxyhaemoglobin.
In which part of the oxyhaemoglobin dissociation curve do changes in Po2 have a relatively little effect on So2?
'Flat part of the curve'
How does the presence of CO affect the measurement of SO2 in ABG analysis?
It has no effect on the calculated SO2.
At approximately what Pao2 level is hemoglobin maximally saturated according to the text?
13 kPa
Test your knowledge on the factors that determine how much oxygen blood can carry, including hemoglobin concentration and saturation levels. Learn about measuring oxygen saturation in the blood using pulse oximetry.
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