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Numerous oxygen delivery systems are used to treat hypoxemia. It is unknown if F IO 2  at the lips predicts oropharyngeal F IO 2  for various oxygen mask systems. We tested whether F IO 2  measurements differed between the lips and oropharynx, and whether this difference depends on the mask system.

Oropharyngeal Oxygen Concentration Is Dependent on the Oxygen Mask System and Sampling Location