Patients having procedural sedation with propofol for minor surgical procedures like fracture reductions, abcess incisions, joint reductions and what-not were randomised into one of two groups. One group received supplemental higher-flow O2 on a rebreather mask five minutes before and during the procedure. The other group received room air throughout the same non-rebreather mask. Then they looked at how many patients developed hypoxemia, in this case meaning sats below 93%. The results are in the diagram below.
They conclude that patients who get supplemental O2 are less likely to become hypoxaemic during the procedure.
So what they are basically saying is that pre oxygenation prevents hypoxemia and supplying the patient with oxygen cures hypoxemia.
We knew that. Right?
The article can be found here.