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When should you go to the ER for low oxygen levels? 

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Because hypoxemia quickly recurred when oxygen was discontinued, oxygen supplementation should be provided continuously throughout anesthesia.
However, interventions should be attempted to reduce recirculation when oxygen delivery is suboptimal and recirculation is suspected.
If that was the method used, it might explain the slightly higher saturation levels found when patients used oxygen as soon as they started activities.
The frequency of low oxygen levels is consistent with data from earlier studies.
Implications for Practice: Need for supplemental oxygen should be assessed according to the American Heart Association guidelines.
We concluded that all acutely ill patients receiving PDP should be carefully monitored and, if necessary, should receive increased levels of inspired oxygen to avoid hypoxemia.